JP2016061678A - Corrosion resistance test device and corrosion resistance test method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To test corrosion of a test piece, even under an environment there is a less amount of chloride ion being a corrosion promotion factor.SOLUTION: A corrosion resistance test device of the invention comprises: a test chamber in which a metal test piece being a test object related to corrosion, is disposed; a wet air creation part for creating wet air which is supplied to the test chamber; and a test environment adjustment part having a function for adjusting a test environment which includes at least outside temperature of the test chamber. The test chamber comprises: a housing part formed of a material having a predetermined heat conductivity; and a high heat conduction part which is buried for filling an opening formed on a part of the housing part, and which is formed of a heat transfer member having heat conductivity higher than that of the housing part. The test piece is disposed on the high heat conduction part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a corrosion resistance test apparatus and a corrosion resistance test method.

  Various methods such as salt spray test (JIS Z 2371) and automobile parts appearance test method (JASO M610) have been proposed as methods for evaluating the corrosion resistance of metal plates such as steel plates. It is used as a development tool.

  In addition, in Patent Document 1 below, in order to evaluate the corrosion resistance of a metal material, (A) a step of attaching a salt containing chloride ions to the surface of the metal material, and (B) temperature and relative humidity on the metal material. Discloses a method of performing the drying step and the wetting step set by changing the step shape one or more times.

  These evaluation methods for corrosion resistance are extremely useful as means for examining improvement in corrosion resistance of specific parts such as end faces, processed parts, and scratched parts, and means for investigating the influence on corrosion products in a corrosive environment.

JP 2003-329573 A

  However, the salt spray test and the automotive part appearance test method and the evaluation method disclosed in Patent Document 1 employ a method of promoting corrosion with a compound containing chloride ions such as NaCl. Therefore, in these evaluation methods, an environment in which NaCl, which is a corrosion promoting factor, is hardly present, such as indoors where the concentration of chloride ions, which are corrosion promoting factors, is often 100 ppm or less, or outdoors, such as in rural areas, etc. There is a problem that it is impossible to simulate the corrosion conditions in As a result, the investigation of corrosion in an environment where there is almost no corrosion promoting factor such as NaCl needs to rely on the actual exposure test, and there are problems such as inability to obtain reproducibility and time.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to test the corrosion resistance of a test piece even in an environment where there are few chloride ions which are corrosion promoting factors. An object of the present invention is to provide a corrosion resistance test apparatus and a corrosion resistance test method that can be used.

  In order to solve the above problems, according to one aspect of the present invention, a test chamber in which a metal test piece which is a test object related to corrosion resistance is disposed, and wet air supplied to the test chamber are generated. And a test environment adjusting unit having a function controlled to adjust a test environment including at least a temperature outside the test chamber, and the test chamber has a predetermined thermal conductivity. A housing part formed of a material having a high heat conduction part embedded in a part of the housing part so as to be filled and formed of a heat transfer member having a higher thermal conductivity than the housing part And a corrosion resistance test apparatus in which the test material is disposed in the high thermal conductivity portion.

  The test environment adjustment unit further includes at least one of a temperature and a flow rate of the wet air supplied to the test chamber and a flow rate of the wet air discharged from the test chamber as the test environment. You may have the function controlled to adjust.

  In the test chamber, the humid air may be supplied from the bottom surface side of the test chamber and discharged from the top surface side.

  The test environment adjustment unit maintains the first temperature for a predetermined time while adjusting the temperature outside the test chamber to a first temperature higher than the temperature of the wet air. A drying process for drying the interior, and maintaining the second temperature for a predetermined time while adjusting the temperature outside the test chamber to a second temperature lower than the temperature of the humid air, The test environment may be adjusted such that a moistening process for moistening the inside of the water is alternately performed.

  The test environment adjusting unit supplies the wet air to the test chamber for a predetermined time, and then stops supplying the wet air to the test chamber and discharging the wet air from the test chamber. The process and the temperature outside the test chamber are adjusted to a second temperature lower than the temperature of the humid air, and the second temperature is maintained for a predetermined time to wet the inside of the test chamber. The inside of the test chamber is dried by maintaining the first temperature for a predetermined time while adjusting the temperature outside the test chamber to a first temperature higher than the temperature of the wet air. The test environment may be adjusted such that the drying process is performed sequentially.

  It is preferable that the wet air generating unit has a container in which water of a predetermined temperature is accommodated, and the wet air is generated by blowing air into the water.

  The test environment adjustment unit that adjusts the test environment related to the temperature outside the test chamber may be a temperature adjustment mechanism or a thermostat provided outside the test chamber.

  The test environment adjusting units for adjusting the flow rate of the humid air supplied to the test chamber and the flow rate of the wet air discharged from the test chamber are respectively positioned at the front and rear stages of the test chamber. The adjustment valve provided in the piping for the humid air to perform may be sufficient.

  The test environment adjustment unit that adjusts the temperature of the wet air supplied to the test chamber may be a temperature adjustment mechanism provided in the wet air generation unit.

  You may further provide the control unit which controls at least the said test environment adjustment part.

  It is preferable that the relative humidity of the moist air generated by the moist air generator is 100%.

  The chloride ion concentration in the test chamber is preferably 100 ppm or less.

  In order to solve the above problems, according to another aspect of the present invention, a test chamber in which a metal test piece which is a test object related to corrosion resistance is disposed, and a wetness supplied to the test chamber. A humid air generating unit for generating air, and a test environment adjusting unit having a function controlled to adjust a test environment including at least a temperature outside the test chamber, wherein the test chamber has a predetermined heat A housing part formed of a material having conductivity and an embedded portion filled with an opening provided in a part of the housing part, and formed of a heat transfer member having a higher thermal conductivity than the housing part. A high heat conduction part, and a corrosion resistance test apparatus in which the test material is disposed in the high heat conduction part, and the temperature outside the test chamber is higher than the temperature of the wet air. While adjusting the temperature, maintain the first temperature for a predetermined time. Thus, while adjusting the drying process for drying the inside of the test chamber and the temperature outside the test chamber to a second temperature lower than the temperature of the wet air, the second temperature is set for a predetermined time. By maintaining, there is provided a corrosion resistance test method that alternately performs a wetting process of wetting the inside of the test chamber.

  According to still another aspect of the present invention, a test chamber in which a metal test piece which is a test object related to corrosion resistance is disposed, and wet air generation for generating wet air supplied to the test chamber. And a test environment adjustment unit having a function controlled to adjust a test environment including at least a temperature outside the test chamber, and the test chamber is formed of a material having a predetermined thermal conductivity. And a high heat conduction part that is embedded to fill an opening provided in a part of the case part and is formed of a heat transfer member having a higher thermal conductivity than the case part. And using the corrosion resistance test apparatus in which the test material is disposed in the high thermal conductivity portion, supplying the wet air to the test chamber for a predetermined time, and then supplying the wet air to the test chamber and Exhaust the humid air from the test chamber The wet air supply process, and adjusting the temperature outside the test chamber to a second temperature lower than the temperature of the wet air while maintaining the second temperature for a predetermined time. A wet process for wetting the interior of the chamber, and adjusting the temperature outside the test chamber to a first temperature higher than the temperature of the humid air while maintaining the first temperature for a predetermined time, A corrosion resistance test method is provided which sequentially performs a drying process for drying the inside of the test chamber.

  In the corrosion resistance test method, it is preferable that a relative humidity of the wet air generated by the wet air generation unit is 100%.

  In the corrosion resistance test method, the concentration of chloride ions in the test chamber is preferably 100 ppm or less.

  As described above, according to the present invention, it is possible to test the corrosion resistance of a test piece even in an environment where there are few chloride ions which are corrosion promoting factors.

It is the schematic diagram which showed an example of the whole structure of the corrosion resistance test apparatus which concerns on the 1st Embodiment of this invention. It is the schematic diagram which showed an example of the structure of the test unit of the corrosion resistance test apparatus which concerns on the same embodiment. It is explanatory drawing for demonstrating the test unit which concerns on the same embodiment. It is the schematic diagram which showed an example of the structure of the test unit of the corrosion resistance test apparatus which concerns on the same embodiment. It is the schematic diagram which showed an example of the structure of the test unit of the corrosion resistance test apparatus which concerns on the same embodiment. It is the schematic diagram which showed another example of the structure of the test unit of the corrosion resistance test apparatus which concerns on the same embodiment. It is explanatory drawing for demonstrating the corrosion-resistance test method which concerns on the same embodiment. It is explanatory drawing for demonstrating the corrosion-resistance test method which concerns on the same embodiment. It is explanatory drawing for demonstrating the corrosion-resistance test method which concerns on the same embodiment. It is explanatory drawing for demonstrating the corrosion-resistance test method which concerns on the same embodiment. It is the block diagram which showed an example of the hardware constitutions of the control unit of the corrosion resistance test apparatus which concerns on the same embodiment. FIG. 10 is an explanatory diagram for explaining an experimental example 1; 10 is a graph showing the results of Experimental Example 1. FIG.

  Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

(About the overall configuration of the corrosion resistance test equipment)
First, the overall configuration of the corrosion resistance test apparatus according to the first embodiment of the present invention will be described in detail with reference to FIG. FIG. 1 is a schematic diagram showing an example of the overall configuration of the corrosion resistance test apparatus according to the present embodiment.

  The corrosion resistance test apparatus according to the present embodiment is a metal plate containing iron or non-ferrous metal, or a metal plate that has been subjected to surface treatment such as plating, a resin or a ceramic material, and the like. Is a device for testing. The corrosion resistance test apparatus according to the present embodiment can evaluate the corrosion resistance of a metal plate or the like to be tested even in an environment where there is almost no corrosion promoting factor having a chloride ion concentration of 100 ppm or less. For example, as schematically shown in FIG. 1, the corrosion resistance test apparatus 10 includes at least a test unit 100, and preferably includes a control unit 200.

  The test unit 100 is a unit in which a test piece collected from a metal plate to be tested is installed at a predetermined location, and the corrosion resistance of the test piece is tested. As illustrated in FIG. 1, the test unit 100 includes a wet air generation unit 101, a test chamber 103, and a test environment adjustment unit 105. As will be described later, the test environment adjustment unit 105 may be disposed so as to surround the test chamber 103, and the test chamber 103 may be provided inside the test environment adjustment unit 105.

  The wet air generation unit 101 is a part that generates wet air supplied to a test chamber 103 to be described later. In the humid air generation part 101, the air adjusted to the predetermined pressure (air pressure) is blown into the water adjusted to the predetermined temperature, so that the humid air in the saturated state is generated. That is, the moist air generating unit 101 is a part that generates moist air having a relative humidity of approximately 100% (preferably, moist air having a relative humidity of 100%). The wet air generated by the wet air generation unit 101 is supplied to the test chamber 103 via a heat-insulated pipe.

In addition, the specific structure of the humid air production | generation part 101 is demonstrated anew below.
In addition, the piping for supplying the humid air is not particularly limited, and may be a resin-like member, a metal member, an alloy member, etc., as long as it is a heat-insulated pipe member. Known members can be used. In such a case, even if the pipe-shaped member used for the piping does not have sufficient heat insulation by itself, the pipe-shaped member is sufficiently wound around the pipe-shaped member and passed through the pipe. It is sufficient that the humid air and the external environment do not affect each other. As such piping, for example, a pipe in which a heat insulating material is sufficiently wound around a plastic pipe (for example, a pipe in which a heat insulating material is wound around a plastic pipe of φ10 mm until the outer shape becomes about φ30 to 40 mm) is used. Is possible.

  In the salt spray test and the method described in Patent Document 1 described above, a liquid containing NaCl is sprayed. Since salts containing chloride ions such as NaCl have a property of absorbing moisture (ie, deliquescence), the salt spray test and the method described in Patent Document 1 care about the relative humidity of the supplied humid air. Without causing condensation. However, since the corrosion resistance test apparatus 10 according to the present embodiment simulates an environment in which the concentration of salts containing chloride ions such as NaCl is 100 ppm or less, for example, there is almost no salt containing chloride ions. Condensation cannot be created by utilizing the characteristics of salts. Therefore, as described above, it is important to create wet air in a saturated state (wet air having a relative humidity of approximately 100%) by the wet air generation unit 101.

  The test chamber 103 is provided with a metal test piece which is a test object related to corrosion resistance. The test chamber 103 is connected to the wet air generation unit 101 by a thermally insulated pipe, and is supplied with wet air generated by the wet air generation unit 101. The test chamber 103 is connected to an insulated pipe for discharging wet air from the test chamber 103, and the wet air supplied to the test chamber 103 is connected to the outside of the test chamber 103 through the pipe. And discharged.

  In the corrosion resistance test apparatus 10 according to the present embodiment, the temperature outside the test chamber 103 is set to a temperature lower or higher than the temperature of the supplied humid air, so that the inside of the test chamber 103 is condensed. Control to a state where water is generated or dry. In other words, the corrosion resistance test apparatus 10 according to this embodiment controls the relative humidity inside the test chamber 103 by setting the absolute humidity of the atmosphere inside the test chamber 103 as a constant dew point and subjecting the test chamber 103 to a cooling cycle. To do. Therefore, it is important that the test chamber 103 does not have a humidity control function.

  In addition, since the corrosion resistance test apparatus 10 according to the present embodiment simulates an environment where the chloride ion concentration is 100 ppm or less and does not include a corrosion promoting factor, the chloride ion concentration inside the test chamber 103 is set to 100 ppm. The following.

  A specific configuration of the test chamber 103 will be described in detail later.

  The test environment adjustment unit 105 has a function controlled to adjust the test environment including at least the temperature outside the test chamber 103. The test environment adjustment unit 105 further includes at least one of the temperature and flow rate of wet air supplied to the test chamber 103 and the flow rate of wet air discharged from the test chamber 103 as the test environment. It is preferable to have a function controlled to adjust.

  Specifically, the test environment adjustment unit 105 is provided in the humid air generation unit 101, the test chamber 103, a pipe connected to the test chamber 103, a space outside the test chamber 103, and the like. This is realized by various devices and members.

  For example, the test environment adjustment unit 105 that adjusts the test environment related to the temperature outside the test chamber 103 surrounds the temperature adjustment mechanism, such as a heater, a cooler, or a thermostat, provided outside the test chamber 103 or the test chamber 103. It can be realized as a constant temperature bath provided as described above.

  In addition, the test environment adjusting unit 105 that adjusts the flow rate of wet air supplied to the test chamber 103 and the flow rate of wet air discharged from the test chamber 103 is located in the front and rear stages of the test chamber 103. It can be realized as various regulating valves provided in the piping.

  Further, the test environment adjustment unit 105 that adjusts the temperature of the humid air supplied to the test chamber 103 is realized as various temperature adjustment mechanisms such as a heater, a cooler, and a thermostat provided in the wet air generation unit 101. It is possible.

  These test environment adjustment units 105 can maintain the test environment of the corrosion resistance test in a desired state by appropriately adjusting the wet air generation unit 101, the environment outside the test chamber 103, piping, and the like. It becomes.

  These test environment adjustment units 105 may be controlled by a control unit 200 described later based on various user inputs to the corrosion resistance test apparatus 10. Further, a desired test environment may be realized by the user directly operating these test environment adjustment units 105.

  Specific examples of these test environment adjustment units 105 will also be described later.

  When these test environment adjustment units 105 function in cooperation with each other, the corrosion resistance test of the test piece can be performed.

  For example, the test environment adjusting unit 105 (1) maintains the first temperature for a predetermined time while adjusting the temperature outside the test chamber 103 to the first temperature higher than the temperature of the humid air. Then, a drying process for drying the inside of the test chamber 103, and (2) adjusting the temperature outside the test chamber 103 to a second temperature lower than the temperature of the humid air, while maintaining the second temperature for a predetermined time. By maintaining the test environment, the corrosion resistance test of the test piece can be performed by adjusting the test environment so that the moistening process of moistening the inside of the test chamber 103 is alternately performed.

  In addition, the test environment adjusting unit 105 (1) after supplying the test chamber 103 with wet air for a predetermined time, stops supplying the wet air to the test chamber 103 and discharging the wet air from the test chamber 103. And (2) adjusting the temperature outside the test chamber 103 to a second temperature lower than the temperature of the humid air while maintaining the second temperature for a predetermined time. (3) maintaining the first temperature for a predetermined time while adjusting the temperature outside the test chamber 103 to a first temperature higher than the temperature of the humid air. The corrosion resistance test of the test piece can be performed by adjusting the test environment so that the drying process of drying the inside of the test chamber 103 is sequentially performed.

  These two types of corrosion resistance test methods will be described again below.

  The test unit 100 included in the corrosion resistance test apparatus 10 according to the present embodiment has been described above with reference to FIG.

  The control unit 200 is a unit that controls various functions of the test unit 100. The control unit 200 controls the test unit 100 to be in a desired state by controlling various test environment adjustment units 105 provided in the test unit 100, for example.

  The specific configuration of the control unit 200 is not particularly limited, and a known control unit can be used. For example, the control unit 200 may be a control board made of an IC chip or the like mounted on the test environment adjustment unit 105 as described above, or may be connected to the test environment adjustment unit 105 operating under the control of a computer. It may be a drive mechanism such as an mounted actuator. The control unit 200 may be an arithmetic processing device such as a computer that controls the functions of the test unit 100 in an integrated manner.

  The control unit 200 controls the test environment adjustment unit 105 to be in a desired state according to a user operation. The control unit 200 can also automatically control the state of the test unit 100 based on various preset control programs.

  The overall configuration of the corrosion resistance test apparatus 10 according to the present embodiment has been described above with reference to FIG.

(Specific example of test unit 100)
Next, the test unit 100 included in the corrosion resistance test apparatus 10 according to the present embodiment will be specifically described with reference to FIGS. FIG. 2 is a schematic diagram illustrating an example of a configuration of a test unit of the corrosion resistance test apparatus according to the present embodiment. FIG. 3 is an explanatory diagram for explaining the test unit according to the present embodiment. 4 and 5 are schematic views showing an example of the configuration of the test unit of the corrosion resistance test apparatus according to the present embodiment. FIG. 6 is a schematic diagram showing another example of the configuration of the test unit of the corrosion resistance test apparatus according to the present embodiment.

<Moist air generator 101>
As schematically shown in FIG. 2, the wet air generation unit 101 of the test unit 100 is immersed in a container 111 such as a cleaning bottle, water (distilled water) 113 accommodated in the container 111, and water 113. Nozzle 115. In addition, a supply pipe 107 for supplying wet air is connected to the container 111 so as not to be immersed in the water 113.

  Here, in the middle of the nozzle 115, a flow meter 117 for measuring the flow rate of the air flowing through the nozzle 115 may be provided. In addition, in the water 113 accommodated in the container 111, a temperature adjustment mechanism 119 for adjusting the temperature of the water 113 (and thus the temperature of the generated wet air) to a desired temperature is provided. Such a temperature adjustment mechanism 119 is an example of a test environment adjustment unit 105 that adjusts the temperature of wet air supplied to the test chamber 103. The temperature adjustment mechanism 119 is not particularly limited as long as the temperature can be controlled, and a known temperature adjustment mechanism such as a thermostat can be used.

  The air adjusted to a predetermined pressure (pneumatic pressure) is blown into the water 113 heated to a desired temperature by the temperature adjusting mechanism 119 via the nozzle 115, and foams and rises in the water, so that the relative humidity is 100%. Of moist air. The generated humid air having a relative humidity of 100% is supplied to the test chamber 103 via the supply pipe 107, and a flow rate adjustment valve 121 is provided in the middle of the supply pipe 107, so The supply flow rate is adjusted. The flow rate adjustment valve 121 is an example of the test environment adjustment unit 105 that adjusts the flow rate of the humid air supplied to the test chamber 103.

<Test room 103>
The test chamber 103 includes a housing part 131 formed of a material having a predetermined thermal conductivity, and a high heat conduction part 133 formed of a heat transfer member having a higher thermal conductivity than the housing part 131. . In the present embodiment, for example, the housing part 131 can be made of resin, and the high heat conduction part 133 can be made of metal or alloy. Here, as schematically shown in FIG. 3, an opening is provided in a part of the housing 131 (for example, the bottom surface of the housing 131), and for example, transmission is performed so as to fill the opening. A heat transfer member such as a heat plate or a heat sink is embedded. This embedded heat transfer member becomes the high heat conduction portion 133. In addition, the test chamber 103 is provided with an openable / closable opening (not shown) for arranging the test piece S inside the test chamber 103.

  Connected to the housing part 131 of the test chamber 103 are a pipe 107 for supplying wet air and a discharge pipe 109 for discharging wet air from the test chamber 103. A flow rate adjusting valve 123 is provided in the middle of the discharge pipe 109 to adjust the discharge flow rate of wet air. The flow rate adjustment valve 123 is an example of the test environment adjustment unit 105 that adjusts the flow rate of the humid air discharged from the test chamber 103.

  An external temperature adjustment mechanism 151 for adjusting the external temperature is provided outside the test chamber 103. The external temperature adjustment mechanism 151 is an example of the test environment adjustment unit 105 that adjusts the test environment related to the temperature outside the test chamber 103. The external temperature adjusting mechanism 151 is not particularly limited as long as the temperature can be controlled, and a known one such as a heater, a cooler, or a thermostat can be used.

  Furthermore, a sensor 135 for measuring the temperature and humidity inside the test chamber 103 is provided inside the test chamber 103. By paying attention to the output from the sensor 135, the temperature and humidity in the test chamber 103 can be grasped at any time.

  In the test chamber 103 according to the present embodiment, since the heat transfer member is embedded so as to fill the opening, there is no direct inflow / outflow of the atmosphere between the inside and the outside of the test chamber 103. However, since the test chamber 103 is composed of two parts having different thermal conductivities, the heat transfer between the inside and the outside of the test chamber 103 is performed via the high heat conduction unit 133. As a result, the temperature inside the test chamber 103 follows the temperature outside the test chamber 103 easily and quickly.

  In addition, when the heat is transferred mainly through the high heat conduction unit 133 and the wet air supplied to the test chamber 103 is condensed, the high heat conduction unit 133 is given priority over the housing unit 131. Condensation will occur. Therefore, by disposing the test piece S in the high heat conducting portion 133, for example, as schematically shown in FIG. 4, a water film W resulting from condensation can be selectively formed on the test piece S. it can.

Furthermore, in the corrosion resistance test apparatus 10 according to the present embodiment, the water film W is formed on the test piece S by dew condensation of moisture contained in the humid air. The thickness d) is on the order of nm. Accordingly, in the reduction reaction of dissolved oxygen that occurs at the interface between the test piece and the water film (O ₂ + 2H ₂ O + 4e ⁻ → 4OH ⁻ ), it is possible to accelerate the supply of oxygen from the atmosphere to the interface. The dissolved oxygen concentration can be improved. As a result, it becomes possible to simulate corrosion due to condensation in an indoor high humidity environment where there is no corrosion promoting factor.

  Further, in order to cause dew condensation on the test specimen S more reliably, as schematically shown in FIG. 5, the humid air is supplied from the bottom surface side of the test chamber 103 and discharged from the top surface side. It is preferable. This makes it possible to reliably introduce wet air above the test piece S, and reduce the amount of wet air that is discharged from the test chamber 103 without condensation.

  For example, as shown in FIG. 6, a constant temperature bath 153 surrounding the test chamber 103 may be provided instead of the external temperature adjustment mechanism 151 of FIG. 2. By using such a thermostatic chamber 153, the temperature inside the test chamber 103 can be adjusted more easily. Here, FIG. 6 shows a mode in which the test chamber 103 is supported using a columnar member, but a net-like shelf is provided in the thermostat 153 and the test chamber 103 is installed on the shelf. You may make it do.

  The specific example of the test unit 100 has been described in detail above with reference to FIGS.

(Corrosion resistance test method)
Next, a corrosion resistance test method using the corrosion resistance test apparatus 10 shown in FIGS. 1 to 6 will be described in detail with reference to FIGS. 7-10 is explanatory drawing for demonstrating the corrosion-resistance test method which concerns on this embodiment.

Below, first, the cooling / heating cycle implemented by the corrosion resistance test method according to the present embodiment will be described with reference to the schematic wet air diagram shown in FIG.
The air introduced into the humid air generating unit 101 passes through the humid air generating unit 101 and becomes humid air having a temperature T _air and a relative humidity of 100%. The wet air generated by the wet air generation unit 101 corresponds to the point A on the curve of relative humidity = 100% in the wet air diagram shown in FIG.

Here, the temperature outside the test chamber 103 is increased to T _dry (> T _air ) over a predetermined time (for example, 0.5 hour) by the external temperature adjusting mechanism 151 or the constant temperature bath 153, and the predetermined holding time is reached. By holding only (for example, 3.5 hours), the temperature of the humid air supplied into the test chamber 103 also becomes T _dry . Since the amount of saturated water vapor increases as the temperature rises, the relative humidity of the humid air that is saturated at the temperature T _air is less than 100% at the temperature T _dry . As a result, at the temperature T _dry , the inside of the test chamber 103 is in a dry state. Since this state operation has a constant absolute humidity, the wet air diagram corresponds to the operation of moving the point A to the high temperature side parallel to the temperature axis, and the wet air in this state is shown in FIG. It corresponds to point B in the wet air diagram.

Thereafter, the temperature outside the test chamber 103 is decreased to T _wet (<T _air ) over a predetermined time (for example, 0.5 hour) by the external temperature adjustment mechanism 151 or the constant temperature bath 153, and the predetermined holding time ( For example, the temperature of the humid air supplied into the test chamber 103 is also T _wet by holding for 3.5 hours. Here, since the relationship of T _wet <T _air is established, when the temperature shifts to T _wet , it intersects with a curve of relative humidity = 100% at point A, and thereafter, a curve of relative humidity = 100%. Along the line to point C. As a result, at the temperature T _wet , the inside of the test chamber 103 is in a wet state, and moisture in the humid air corresponding to the difference between the vertical coordinate of the point A and the point C is condensed.

Here, the values of the temperatures T _dry and T _wet are not particularly limited, and may be appropriately set in consideration of the maximum temperature and the minimum temperature in the environment to be simulated. As for the temperature T _air , an easy-to-handle temperature that satisfies the relationship of T _wet <T _air <T _dry may be set as T _air , but the atmospheric dew point in the environment to be simulated may be referred to. For example, when an environment such as indoors or countryside in Japan is simulated, T _wet = 15 ° C., T _air = 20 ° C., T _dry = 35 ° C. can be set.

  The cooling cycle as described above corresponds to the exposure operation for one day in the outdoor exposure test. Therefore, by repeating one cycle of dry state (3.5 hours) → transition time 0.5 hours → wet state (3.5 hours) → transition time 0.5 hours → 24 hours, in the outdoor exposure test The exposure operation for 3 days was performed. The conventional test method including salt water spray has a problem that salt adhering to the test piece is deliquescent and an excessively thick water film is formed on the test piece. However, according to the corrosion resistance test method according to the present embodiment, the thickness of the water film formed on the test piece due to condensation of moisture contained in the humid air is on the order of nm, and the indoor high humidity where there is no corrosion promoting factor. It is possible to simulate corrosion due to condensation in the environment.

<First Corrosion Resistance Test Method>
Next, of the two types of corrosion resistance test methods that can be performed by the corrosion resistance test apparatus 10 according to the present embodiment, a first method in which the adjustment of the test environment is simpler will be described with reference to FIG.

In this first method, as shown in FIG. 8, the temperature T _air generated by the humid air generation unit 101 and the humid air having a relative humidity of 100% are always supplied to the test chamber 103, and the test chamber 103 It is carried out under the condition of being discharged from. That is, during the corrosion resistance test in the corrosion resistance test apparatus 10 shown in FIGS. 2 and 6, the temperature adjustment mechanism 119 continues to maintain the temperature of the water 113 stored in the container 111 at T _air (for example, 20 ° C.) The flow rate adjusting valves 121 and 123 maintain the degree of opening of the valves so that the supply flow rate and the discharge flow rate of the humid air have desired values.

In the first method, the temperature outside the test chamber 103 is increased to T _dry (for example, 35 ° C.) over a predetermined time (for example, 0.5 hour) by the external temperature adjusting mechanism 151 or the constant temperature bath 153, It is held at the temperature T _dry for a predetermined holding time (for example, 3.5 hours). As a result, when T _air = 20 ° C. and T _dry = 35 ° C., the relative humidity inside the test chamber 103 is about 42% from the wet air diagram, and a dry state is realized.

Subsequently, the external temperature adjustment mechanism 151 or the constant temperature bath 153 lowers the temperature around the test chamber 103 over a transition time of about 0.5 hours and holds it at T _wet (for example, 15 ° C.). Here, since the absolute humidity in the test chamber 103 is constant, the relative humidity inside the test chamber 103 is 100%, and water vapor that cannot exist in the humid air preferentially condenses on the high heat conduction unit 133. A wet state is realized. As a result, a water film having a thickness of the order of nm is formed on the test piece S placed on the high thermal conductivity portion 133.

  After that, the cooling cycle is repeated: transition time (within 0.5 hours) → dry state (3.5 hours) → transition time (within 0.5 hours) → wet state (3.5 hours) →. Thus, the corrosion resistance test of the test piece S is carried out.

<Second Corrosion Resistance Test Method>
Next, referring to FIGS. 9 and 10, the thickness of the water film W formed on the test piece S is constant among the two types of corrosion resistance test methods that can be performed by the corrosion resistance test apparatus 10 according to the present embodiment. A second method that can be maintained at the same time will be described.

  In the first method described above, the test environment can be easily adjusted, but the thickness of the water film W formed on the test piece S always changes. Therefore, the concentrations of dissolved oxygen contained in the water film and corrosion promoting factors such as NaCl constantly change, and it becomes difficult to accurately grasp the influence of these corrosion promoting factors on the corrosion resistance.

  Therefore, in the second method shown below, a water film having an arbitrary thickness is formed on the test piece, and the corrosion proceeds while the thickness of the water film is kept constant. Thereby, the change with time of the concentration of the corrosion promoting factor can be made almost constant, and the influence of these corrosion promoting factors on the corrosion resistance can be grasped with high reproducibility.

In this second method, as schematically shown in FIG. 9, three processes are repeated: a process of exhausting while supplying humid air to the test chamber 103, a wet process, and a dry process. Here, during the corrosion resistance test in the corrosion resistance test apparatus 10 shown in FIGS. 2 and 6, the temperature adjustment mechanism 119 continues to maintain the temperature of the water 113 accommodated in the container 111 at T _air (for example, 20 ° C.). However, when the humid air supply process ends, the flow rate adjustment valves 121 and 123 are closed, and the supply and discharge of the humid air are stopped.

First, in the humid air supply process, humid air having a temperature T _air and a relative humidity of 100% generated by the humid air generation unit 101 is supplied to the test chamber 103 and discharged from the test chamber 103.

Here, as schematically shown in FIG. 10, the flow rate of wet air supplied into the test chamber 103 is F ₀ [m ³ / s], the water content is α ₀ [g / m ³ ], and the temperature Is T ₀ [° C.], the temperature in the test chamber 103 is T ₁ [° C.], and the water content is α ₁ [g / m ³ ]. Further, when the flow rate of the humid air discharged from the test chamber 103 is F ₁ [m ³ / s] and the temperature is T ₁ [° C.], the discharge flow rate F ₁ is a constant determined depending on the supply flow rate F _0. Become. Here, the water content in the steady state inside the test chamber 103 is α ₁ [g / m ³ ], and the temperature is T ₁ [° C.].

Therefore, in the example shown in FIG. 10, the amount of water supplied to the test chamber 103 per unit time is calculated using the flow rate F ₀ and the water content α ₀ as follows: F ₀ α ₀ [g-H ₂ O / s], and the amount of water discharged from the test chamber 103 per unit time is F ₁ α ₁ [g-H ₂ O / s]. Accordingly, the amount of water that increases in the test chamber 103 during the time t [s] is (F ₀ α ₀ −F ₁ α ₁ ) × t [g].

In the corrosion resistance test apparatus 10 according to the present embodiment, the increased water vapor is preferentially condensed on the high heat conductive portion 133 by providing the high heat conductive portion 133 in the test chamber 103. Now, when all the increased water vapor is condensed on the high heat conduction part 133 (area A [m ² ]), the amount of the water film W that increases during the time t [s] is {(F ₀ α ₀ −F ₁ α ₁ ) × t} / A [g / m ² ].

Here, the test environments F ₀ , α _0, T _0, T ₁ are controllable environmental factors, and the test environments F _1, α ₁ are constants determined depending on the controllable environmental factors. Therefore, the thickness d of the water film W formed on the test piece S is a function of the time t for supplying the humid air. From these findings, after the time t [s] has elapsed, the thickness d of the water film is maintained by sealing the inlet and outlet of the test chamber 103 (in other words, closing the flow rate adjusting valves 121 and 123). Corrosion resistance test can be performed as it is. The holding time t can be calculated in advance by specifying the thickness of the water film formed in the environment to be simulated in advance. Moreover, when it is desired to shorten the test time, the holding time t can be calculated by specifying the thickness of the water film that can obtain a high corrosion rate in advance.

After supplying and discharging the humid air having a temperature T _air and a relative humidity of 100% generated by the humid air generating unit 101 based on the above knowledge, the flow rate adjusting valves 121 and 123 are closed, and the inside of the test chamber 103 Is kept at a constant value.

Thereafter, the external temperature adjustment mechanism 151 or the constant temperature bath 153 reduces the temperature around the test chamber 103 over a transition time of about 0.5 hours and holds it at T _wet (for example, 15 ° C.). Since the absolute humidity in the test chamber 103 is constant, the relative humidity inside the test chamber 103 is 100%, and water vapor that cannot be present in the humid air is preferentially condensed on the high heat conduction section 133, and is in a wet state. Is realized. As a result, on the test piece S placed on the high thermal conductivity part 133, the amount of the increased water film {(F ₀ α ₀ −F ₁ α ₁ ) × t} / A [g / m ² ] A water film having a corresponding thickness is formed.

Subsequently, the temperature outside the test chamber 103 is increased to T _dry (for example, 35 ° C.) over a predetermined time (for example, 0.5 hours) by the external temperature adjusting mechanism 151 or the constant temperature bath 153, and is maintained at a predetermined level. It is held at the temperature T _dry for a time (eg, 3.5 hours). As a result, when T _air = 20 ° C. and T _dry = 35 ° C., the relative humidity inside the test chamber 103 is about 42% from the wet air diagram, and a dry state is realized.

  After that, the cooling cycle is repeated: wet air supply (within 0.5 hours) → wet state (3.5 hours) → transition time (within 0.5 hours) → dry state (3.5 hours) →. Thus, the corrosion resistance test of the test piece S is performed.

  Heretofore, the two types of corrosion resistance test methods performed by the corrosion resistance test apparatus 10 according to the present embodiment have been described in detail with reference to FIGS. 8 to 10.

(Hardware configuration of control unit 200)
Next, with reference to FIG. 11, an example of the hardware configuration of the control unit 200 will be described in detail when the control unit 200 of the corrosion resistance test apparatus 10 according to the present embodiment is realized by an arithmetic processing device such as a computer. explain. FIG. 11 is a block diagram for explaining a hardware configuration of the control unit 200 according to the embodiment of the present invention.

  The control unit 200 mainly includes a CPU (Central Processing Unit) 901, a ROM (Read Only Memory) 903, and a RAM (Random Access Memory) 905. The control unit 200 further includes a bus 907, an input device 909, an output device 911, a storage device 913, a drive 915, a connection port 917, and a communication device 919.

  The CPU 901 functions as an arithmetic processing unit and a control unit, and controls all or part of the operation in the control unit 200 according to various programs recorded in the ROM 903, the RAM 905, the storage device 913, or the removable recording medium 921. The ROM 903 stores programs used by the CPU 901, calculation parameters, and the like. The RAM 905 primarily stores programs used by the CPU 901, parameters that change as appropriate during execution of the programs, and the like. These are connected to each other by a bus 907 constituted by an internal bus such as a CPU bus.

  The bus 907 is connected to an external bus such as a PCI (Peripheral Component Interconnect / Interface) bus via a bridge.

  The input device 909 is an operation unit operated by the user, such as a mouse, a keyboard, a touch panel, a button, a switch, and a lever. The input device 909 may be, for example, remote control means (so-called remote control) using infrared rays or other radio waves, or an external connection device 923 such as a PDA corresponding to the operation of the control unit 200. Also good. Furthermore, the input device 909 includes, for example, an input control circuit that generates an input signal based on information input by a user using the operation unit and outputs the input signal to the CPU 901. The user of the corrosion resistance test apparatus 10 can input various data and instruct processing operations to the corrosion resistance test apparatus 10 by operating the input device 909.

  The output device 911 is configured by a device that can notify the user of the acquired information visually or audibly. Examples of such devices include CRT display devices, liquid crystal display devices, plasma display devices, EL display devices and display devices such as lamps, audio output devices such as speakers and headphones, printer devices, mobile phones, and facsimiles. The output device 911 outputs results obtained by various processes performed by the control unit 200, for example. Specifically, the display device displays the results obtained by various processes performed by the control unit 200 as text or images. On the other hand, the audio output device converts an audio signal composed of reproduced audio data, acoustic data, and the like into an analog signal and outputs the analog signal.

  The storage device 913 is a data storage device configured as an example of a storage unit of the control unit 200. The storage device 913 includes, for example, a magnetic storage device such as an HDD (Hard Disk Drive), a semiconductor storage device, an optical storage device, or a magneto-optical storage device. The storage device 913 stores programs executed by the CPU 901, various data, various data acquired from the outside, and the like.

  The drive 915 is a recording medium reader / writer, and is built in or externally attached to the control unit 200. The drive 915 reads information recorded on a removable recording medium 921 such as a mounted magnetic disk, optical disk, magneto-optical disk, or semiconductor memory, and outputs the information to the RAM 905. The drive 915 can also write a record on a removable recording medium 921 such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory. The removable recording medium 921 is, for example, a CD medium, a DVD medium, a Blu-ray (registered trademark) medium, or the like. The removable recording medium 921 may be a CompactFlash (registered trademark) (CompactFlash: CF), a flash memory, an SD memory card (Secure Digital memory card), or the like. Further, the removable recording medium 921 may be, for example, an IC card (Integrated Circuit card) on which a non-contact IC chip is mounted, an electronic device, or the like.

  The connection port 917 is a port for directly connecting a device to the control unit 200. Examples of the connection port 917 include a USB (Universal Serial Bus) port, an IEEE 1394 port, a SCSI (Small Computer System Interface) port, and an RS-232C port. By connecting the external connection device 923 to the connection port 917, the control unit 200 acquires various data directly from the external connection device 923 or provides various data to the external connection device 923.

  The communication device 919 is a communication interface configured with, for example, a communication device for connecting to the communication network 925. The communication device 919 is, for example, a communication card for wired or wireless LAN (Local Area Network), Bluetooth (registered trademark), or WUSB (Wireless USB). The communication device 919 may be a router for optical communication, a router for ADSL (Asymmetric Digital Subscriber Line), or a modem for various communication. The communication device 919 can transmit and receive signals and the like according to a predetermined protocol such as TCP / IP, for example, with the Internet and other communication devices. The communication network 925 connected to the communication device 919 is configured by a wired or wireless network, and is, for example, the Internet, a home LAN, an in-house LAN, infrared communication, radio wave communication, satellite communication, or the like. May be.

  Heretofore, an example of the hardware configuration capable of realizing the function of the control unit 200 according to the embodiment of the present invention has been shown. Each component described above may be configured using a general-purpose member, or may be configured by hardware specialized for the function of each component. Therefore, it is possible to change the hardware configuration to be used as appropriate according to the technical level at the time of carrying out this embodiment.

  Subsequently, the corrosion resistance test apparatus and the corrosion resistance test method according to the present embodiment will be specifically described with reference to experimental examples. The following experimental examples are merely examples of the corrosion resistance test apparatus and the corrosion resistance test method according to the present invention, and the corrosion resistance test apparatus and the corrosion resistance test method according to the present invention are not limited to the following examples. .

(Experimental example 1)
In Experimental Example 1, using the corrosion resistance test apparatus 10 shown in FIG. 6, the corrosion resistance test of the plated steel sheet whose surface was subjected to the Zn—Al—Mg plating treatment was performed according to the first method shown in FIG. 8. And carried out.

In the test chamber 103, the housing part 131 was formed using a plastic resin, and the high heat conduction part 133 was formed using a commercially available heat sink (area: 200 mm × 200 mm = 0.04 m ² ). Further, the temperatures T _wet = 15 ° C., T _air = 20 ° C., T _dry = 35 ° C. are set, and the supply flow rate and discharge flow rate of the humid air are 1 (L / min) = 1.7 × 10 ⁻⁵ ( m ³ / sec). The cooling / heating cycle conditions were as follows: dry state (3.5 hours) → transition time (0.5 hours) → wet state (3.5 hours) → transition time (0.5 hours) →.

Moreover, the Zn-Al-Mg plated steel sheet as a test piece is
・ Thin plating layer that has not been further treated (no treatment)
-The surface of the plating layer is subjected to chemical conversion treatment consisting of polyurethane resin, silica and phosphoric acid compound (chemical conversion treatment 1)
· The surface of the plating layer is subjected to chemical conversion treatment consisting of polyurethane resin and phosphoric acid compound (chemical conversion treatment 2)
・ Chromate treatment on the surface of the plating layer (chromate treatment)
4 types were prepared.

  At this time, as schematically shown in FIG. 12, a quartz crystal microbalance (QCM) is installed inside the test chamber 103 (on the high heat conduction unit 133) together with the test piece S, and the test chamber A mass change in 103 (that is, a change in the amount of water film) was measured. The quartz crystal microbalance is capable of measuring very small mass changes by utilizing the property that the resonance frequency fluctuates (decreases) depending on the mass of the deposit when a substance adheres to the electrode surface of the quartz crystal. Mass sensor. In addition, a sensor 135 is installed inside the test chamber 103 to measure temperature and relative humidity together.

First, FIG. 13 shows the output results of the QCM and the sensor 135.
As can be seen from FIG. 13, the temperature and humidity inside the test chamber 103 periodically change according to changes in the temperature outside the test chamber 103. Specifically, when the temperature of the test chamber 103 is maintained at 15 ° C., the relative humidity of the test chamber 103 is 100%, and when the temperature of the test chamber 103 is maintained at 35 ° C., the test chamber 103 It can be seen that the relative humidity is less than 50%. Further, focusing attention on the output from the QCM, a deposit of about 2.5 μg / cm ² (that is, condensed water) is observed on the surface of the QCM in a state where the relative humidity is 100%. From this result, it became clear that the water film of nm order can be formed on the surface of the test piece S by using the corrosion resistance test apparatus and the corrosion resistance test method according to the present invention.

  Subsequently, with respect to the above four types of test pieces S, the corrosion resistance test method according to the present invention as described above, the outdoor exposure test (where the chloride ion is 100 ppm or less), and the salt spray in accordance with JIS Z2371. A test was conducted to evaluate the end face corrosion resistance of the plated steel sheet. In addition, evaluation is performed based on the area ratio of the red rust which generate | occur | produced in the end surface of the plated steel plate, The evaluation criteria are as follows.

Corrosion resistance evaluation criteria ○: Red rust area ratio 0 or more and less than 10% △: Red rust area ratio 10 or more and less than 30% ×: Red rust area ratio 30 or more and 100% or less

The obtained results are summarized in Table 1 below.
As is apparent from Table 1 below, the corrosion resistance test method according to the present invention is generally consistent with the evaluation results of the end face corrosion resistance in the outdoor exposure test, while the evaluation result of the end face corrosion resistance in the salt spray test is It is different from the evaluation result in the test. From this result, it became clear that the corrosion resistance test apparatus and the corrosion resistance test method according to the present invention can simulate an outdoor environment.

(Experimental example 2)
In Experimental Example 2, when the corrosion resistance test is performed by the second method shown in FIG. 9 using the corrosion resistance test apparatus 10 shown in FIG. 6, the water adhering to the QCM disposed on the high thermal conductivity portion 133. It was evaluated how the film amount changes.

Here, in the same manner as in Experimental Example 1, the test chamber 103 uses the plastic resin to form the casing 131, and the high heat conduction unit 133 uses a commercially available heat sink (area: 200 mm × 200 mm = 0.04 m ² ). Formed. Further, the temperatures T _wet = 15 ° C., T _air = 20 ° C., T _dry = 35 ° C. are set, and the supply flow rate and discharge flow rate of the humid air are 5 (L / min) = 8.3 × 10 ⁻⁵ ( m ³ / sec). The experimental conditions and the results obtained in this experimental example are summarized in Table 2 below.

<Measurement results>
When the supply flow rate of the humid air F ₀ = 5 L / min, the temperature of the humid air T ₀ = 20 ° C., and the temperature of the discharged wet air T ₁ = 15 ° C., the retention time t = 300 s The increase in water film was 2.5 g / m ^{2 as} measured by QCM.

<Theoretical calculation results>
The water contents α ₀ and α ₁ can be calculated by using the actually measured temperatures T ₀ and T ₁ and the wet air diagram. For example, the absolute humidity at T ₀ = 20 ° C. is found to be 0.015 (g-H ₂ O / g-air) from the wet air diagram. Accordingly, α ₀ = 0.015 (g-H ₂ O / g-air) = 0.015 g-H ₂ O / (8.3 × 10 ⁻⁴ ) m ³ -air = 18 g / m ³ . Similarly, α ₁ = 12 g / m ³ is obtained using the absolute humidity at T ₁ = 15 ° C. obtained from the wet air diagram.

Now, assuming that the supply flow rate F ₀ = the discharge flow rate F ₁ , when all of the increased water vapor is condensed on the high heat conduction section 133, the increase in the water film thickness is (F ₀ α ₀ − F ₁ α ₁ ) t / A [g / m ² ] = 8.3 × 10 ⁻⁵ m ³ / s × (18-12) g / m ³ × 300 s / 0.04 m ² = 3.8 g / m ² It becomes.

  When the actual measurement result by QCM is compared with the above theoretical calculation result, the theoretical calculation result is in the same order as the actual measurement value and the value itself. Therefore, from this result, the validity of the theoretical calculation explained earlier could be confirmed. Thereby, it became clear that the corrosion resistance test can be performed while keeping the thickness of the water film constant by performing the corrosion resistance test method according to the second method of the present invention.

  The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field to which the present invention pertains can come up with various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that these also belong to the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Corrosion resistance test apparatus 100 Test unit 101 Wet air production | generation part 103 Test room 105 Test environment adjustment part 111 Container 113 Water 115 Nozzle 117 Flowmeter 119 Temperature adjustment mechanism 121,123 Flow control valve 131 Housing part 133 High heat conduction part 135 Sensor 151 External Temperature adjustment mechanism 153 Thermostatic bath 200 Control unit

Claims (16)

A test room in which a metal test piece to be tested for corrosion resistance is disposed; and
A humid air generating unit for generating humid air to be supplied to the test chamber;
A test environment adjusting unit having a function controlled to adjust a test environment including at least a temperature outside the test chamber;
With
The laboratory is
A housing portion formed of a material having a predetermined thermal conductivity;
A high thermal conductivity portion that is embedded to fill an opening provided in a part of the housing portion and is formed of a heat transfer member having a higher thermal conductivity than the housing portion;
Consists of
The test material is a corrosion resistance test apparatus disposed in the high thermal conductivity portion.   The test environment adjustment unit further includes at least one of a temperature and a flow rate of the wet air supplied to the test chamber and a flow rate of the wet air discharged from the test chamber as the test environment. The corrosion resistance test apparatus according to claim 1, having a function controlled to be adjusted.   3. The corrosion resistance test apparatus according to claim 1, wherein the humid air is supplied from the bottom surface side of the test chamber and discharged from the top surface side in the test chamber. The test environment adjustment unit
A drying process for drying the interior of the test chamber by adjusting the temperature outside the test chamber to a first temperature higher than the temperature of the humid air while maintaining the first temperature for a predetermined time; ,
A wetting process for moistening the inside of the test chamber by adjusting the temperature outside the test chamber to a second temperature lower than the temperature of the humid air while maintaining the second temperature for a predetermined time; ,
The corrosion resistance test apparatus according to claim 1, wherein the test environment is adjusted such that the test environment is alternately performed. The test environment adjustment unit
A moist air supply process for stopping the supply of the moist air to the test chamber and the exhaust of the moist air from the test chamber after supplying the moist air to the test chamber for a predetermined time;
A wetting process for moistening the inside of the test chamber by adjusting the temperature outside the test chamber to a second temperature lower than the temperature of the humid air while maintaining the second temperature for a predetermined time; ,
A drying process for drying the interior of the test chamber by adjusting the temperature outside the test chamber to a first temperature higher than the temperature of the humid air while maintaining the first temperature for a predetermined time; ,
The corrosion resistance test apparatus according to claim 2, wherein the test environment is adjusted such that the test environment is sequentially performed.   The said humid air production | generation part has a container in which the water of predetermined temperature is accommodated, The said humid air is produced | generated when air is blown in in the said water. The corrosion resistance test apparatus described in 1.   The said test environment adjustment part which adjusts the said test environment regarding the temperature outside the said test chamber is a temperature adjustment mechanism provided in the exterior of the said test chamber, or a thermostat. The corrosion resistance test apparatus described.   The test environment adjusting units for adjusting the flow rate of the humid air supplied to the test chamber and the flow rate of the wet air discharged from the test chamber are respectively positioned at the front and rear stages of the test chamber. The corrosion resistance test apparatus according to any one of claims 2 to 7, wherein the corrosion resistance test apparatus is a regulating valve provided in a pipe for wet air.   The said test environment adjustment part which adjusts the temperature of the said humid air supplied with respect to the said test chamber is a temperature adjustment mechanism provided in the said humid air production | generation part, In any one of Claims 2-8. The corrosion resistance test apparatus described.   The corrosion resistance test apparatus according to claim 1, further comprising a control unit that controls at least the test environment adjustment unit.   The corrosion resistance test apparatus according to any one of claims 1 to 10, wherein a relative humidity of the wet air generated by the wet air generation unit is 100%.   The corrosion resistance test apparatus according to any one of claims 1 to 11, wherein a concentration of chloride ions in the test chamber is 100 ppm or less. At least a test chamber in which a metal test piece that is a test object related to corrosion resistance is disposed, a humid air generating unit that generates humid air supplied to the test chamber, and a temperature outside the test chamber A test environment adjusting unit having a function controlled so as to adjust the test environment, and the test chamber includes a housing part formed of a material having a predetermined thermal conductivity, and a part of the housing part. Embedded in the opening portion provided, and a high heat conduction portion formed of a heat transfer member having a higher thermal conductivity than the housing portion, and the test material is in the high heat conduction portion. Using the installed corrosion resistance test equipment,
A drying process for drying the interior of the test chamber by adjusting the temperature outside the test chamber to a first temperature higher than the temperature of the humid air while maintaining the first temperature for a predetermined time; ,
A wetting process for moistening the inside of the test chamber by adjusting the temperature outside the test chamber to a second temperature lower than the temperature of the humid air while maintaining the second temperature for a predetermined time; ,
Corrosion resistance test method, which is carried out alternately. At least a test chamber in which a metal test piece that is a test object related to corrosion resistance is disposed, a humid air generating unit that generates humid air supplied to the test chamber, and a temperature outside the test chamber A test environment adjusting unit having a function controlled so as to adjust the test environment, and the test chamber includes a housing part formed of a material having a predetermined thermal conductivity, and a part of the housing part. Embedded in the opening portion provided, and a high heat conduction portion formed of a heat transfer member having a higher thermal conductivity than the housing portion, and the test material is in the high heat conduction portion. Using the installed corrosion resistance test equipment,
A moist air supply process for stopping the supply of the moist air to the test chamber and the exhaust of the moist air from the test chamber after supplying the moist air to the test chamber for a predetermined time;
A wetting process for moistening the inside of the test chamber by adjusting the temperature outside the test chamber to a second temperature lower than the temperature of the humid air while maintaining the second temperature for a predetermined time; ,
A drying process for drying the interior of the test chamber by adjusting the temperature outside the test chamber to a first temperature higher than the temperature of the humid air while maintaining the first temperature for a predetermined time; ,
Corrosion resistance test method that carries out sequentially.   The corrosion resistance test method according to any one of claims 13 and 14, wherein a relative humidity of the wet air generated by the wet air generation unit is 100%. The corrosion resistance test method according to any one of claims 13 to 15, wherein a concentration of chloride ions inside the test chamber is 100 ppm or less.

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