JP4920766B2 - Corrosion tester - Google Patents

Description

  The present invention relates to a corrosion tester, and more particularly to a corrosion tester that determines the presence or absence of condensation on a sample.

The corrosion tester is used for metal surface treatment such as painting, plating, alumite and the like, and for evaluating the corrosiveness (rust prevention and corrosion resistance) of metal materials.
In this corrosion tester, the natural environment is reproduced to test the sample, the corrosion state in the natural world is faithfully reproduced, and the corrosivity of the sample can be known artificially in a short time. It is used for testing all industrial products such as automobiles, homes, home appliances, and daily life products.

Japanese Patent Laid-Open No. 7-27694 The weather resistance test apparatus described in Patent Document 1 generates dew condensation by bringing a sample into contact with high-humidity air and directly cooling it, and the measured value detected by the dew condensation sensor. Based on this, the dew condensation state is judged.

  Conventionally, the dew condensation state is judged based on the measurement value detected by the dew condensation sensor. However, the surface of the sample is affected by the material of the sample, deposits such as chloride and solids, dust, and protrusions. The moisture content in the air is reduced and water vapor in the air tends to condense. For this reason, even if the dew condensation sensor does not detect condensation in an air atmosphere that does not reach the dew point, water vapor condensation occurs on the surface of the sample. Condensed water may be generated, and the situation on the surface of the actual sample cannot be grasped, which may deteriorate the reproducibility of the test, and improvement has been desired.

  Accordingly, an object of the present invention is to accurately detect the presence or absence of moisture generation on the surface of the sample and to control the arrival time of the presence or absence of dew condensation on the sample so that the corrosion test of the sample can be performed properly. Is to provide.

The present invention relates to a corrosion tester for performing a corrosion test of a sample, in which a plurality of samples are arranged in a test chamber, and the condensation temperature is provided in one of the samples and detects the condensation temperature of water vapor on the surface of the sample. A detection means and a sample vicinity temperature / humidity detection means for detecting the temperature / humidity in the vicinity of the sample are provided, and the measurement value detected by the condensation temperature detection means and the measurement value detected by the sample vicinity temperature / humidity detection means are provided. A dew condensation presence / absence determining means for determining the presence / absence of moisture on the surface of the sample is provided.
In addition, a partition wall that partitions a test chamber in which a plurality of samples are disposed in the test machine housing and a temperature / humidity adjustment chamber in which each device is disposed is provided, and the temperature / humidity adjustment chamber is at least cooled as each device. A temperature / humidity adjustment path in which a heater, a heater, a humidifier, and a blower are arranged, and a partition that divides the air circulation path through which air can be circulated in communication with the temperature / humidity adjustment path. An opening for communicating the test chamber and the temperature / humidity adjustment chamber is provided and an air volume switching mechanism that operates to open and close the opening is provided, and the presence / absence of moisture on the surface of the sample is determined by the dew condensation presence / absence determining means, Control means for adjusting the air amount from the temperature / humidity adjusting chamber to the test chamber by driving the air flow switching mechanism so as to control the time of occurrence or disappearance of dew condensation in the sample is provided.

  The corrosion tester of this invention measures the temperature change due to the generation and disappearance of condensed water and condensed water on the surface of the sample to accurately detect the presence or absence of moisture generation on the surface of the sample, and the amount of air to the sample ( It is possible to control the arrival time of the presence or absence of dew condensation on the sample by adjusting the air volume), and to properly perform the corrosion test of the sample.

FIG. 1 is a cross-sectional view of a corrosion tester. (Example) FIG. 2 is a flowchart for controlling the arrival time for the presence or absence of condensation. (Example)

  The purpose of this invention is to accurately detect the presence or absence of moisture on the surface of the sample, to measure temperature changes due to the generation or disappearance of condensed water or condensed water on the surface of the sample, and to check whether or not there is condensation on the sample. The purpose of controlling the arrival time is realized by adjusting the amount of air to the sample.

1 and 2 show an embodiment of the present invention.
In FIG. 1, reference numeral 1 denotes a corrosion tester for performing a corrosion test on a sample.
The corrosion tester 1 includes a sample chamber side housing 3 and a temperature / humidity adjustment chamber side housing 4 connected to the sample chamber side housing 3 as a tester housing 2.
In the testing machine housing 2, a test chamber 5 on the sample chamber side housing 3 side where a plurality of samples P are arranged, and a temperature / humidity adjustment chamber 6 on the temperature / humidity adjustment chamber side housing 4 side where each device is arranged, A partition wall 7 for partitioning is formed.

The temperature / humidity adjustment chamber 6 is provided with a partition 10 that partitions the temperature / humidity adjustment path 8 and the air circulation path 9 in the vertical direction. In the temperature / humidity adjustment path 8, at least a cooler 11 that cools the air, a heater 12 that heats the air, and a humidifier 13 that humidifies the air as devices that can adjust the temperature and humidity of the air. And a blower 14 for sending air are sequentially arranged as predetermined portions from the lower side toward the upper side, for example. In addition, the layout of the cooler 11, the heater 12, the humidifier 13, and the blower 14 can be changed as necessary.
The temperature / humidity adjustment path 8 and the air circulation path 9 are communicated with the partition 10 by the upper and lower upper flow paths 15 and 16.
The air circulation path 9 enables the air sent from the upper blower 14 to be circulated to the lower air circulation path 9.
The blower 14 includes a blower fan 17 at the upper part of the air circulation path 9 and a blower motor 18 disposed on the outside of the temperature-controlled room-side housing 4 so as to rotate the blower fan 17.

The partition wall 7 is formed with an upper opening 19 and a lower opening 20 that communicate with the air circulation path 9 of the temperature / humidity adjusting chamber 6 as openings that allow the test chamber 5 and the temperature / humidity adjusting chamber 6 to communicate with each other. An upper rotation shaft 22A of the upper air volume switching damper 22 and a lower rotation shaft 23A of the lower air volume switching damper 23 are provided as an air volume switching mechanism 21 that operates to open and close the upper opening 19 and the lower opening 20. ing. The upper air volume switching damper 22 and the lower air volume switching damper 23 are connected to a driving means (actuator) 24, and are swung around the upper rotating shaft 22A and the lower rotating shaft 23A by the driving means 24 to The amount of air from the humidity adjusting chamber 6 to the test chamber 5 via the upper opening 19 and the amount of air returning from the test chamber 5 to the temperature / humidity adjusting chamber 6 via the lower opening 20 are adjusted.
The air volume switching mechanism 21 is not limited to a damper, and may be other opening / closing means such as a sliding door.

In the test chamber 5, a plurality of samples P are arranged, and a condensation temperature detecting means 25 provided in one of these samples P for detecting a measured value (condensation temperature) of water vapor on the surface of the sample P; A sample vicinity temperature / humidity detecting means 26 for detecting a measurement value (temperature and humidity) in the vicinity of the sample P is provided. The condensation temperature detecting means 25 is made of the same material as the sample P or a representative material, and is provided on the sample P under the same conditions.
The cooler 11, the heater 12, the humidifier 13, the blower motor 18 of the blower 14, the drive means 24, the condensation temperature detection means 25, and the sample vicinity temperature / humidity detection means 26 communicate with the control means 27. The control means 27 is in contact with a temperature / humidity adjustment room temperature / humidity detection means 28 for detecting the temperature / humidity of the upper part of the temperature / humidity adjustment room 6, and a dew condensation selection operation switch provided on the control panel 29. 30 is in contact. This dew condensation selection operation switch 30 is used to select whether or not dew condensation occurs on the surface of the sample P, and is artificially turned on / off and transmits a signal to that effect to the control means 27. .
The control means 27 drives and controls the cooler 11, the heater 12, the humidifier 13, and the blower 14 individually or in combination as necessary so as to control the air circulation amount in the temperature / humidity adjusting chamber 6. To do.
In addition, the control unit 27 is configured to measure the moisture on the surface of the sample P based on the measurement value (condensation temperature) detected by the condensation temperature detection unit 25 and the measurement value (temperature) detected by the sample vicinity temperature / humidity detection unit 26. The upper air volume switching damper 22 and the lower air volume switching damper 23 as the air volume switching mechanism 21 are opened / closed so as to control the presence / absence time of occurrence of dew condensation on the sample P. The amount of air to the test chamber 5 through the upper opening 19 and the amount of air to return from the test chamber 5 to the temperature / humidity adjusting chamber 6 through the lower opening 20 are adjusted.

  For this reason, the control means 27 uses the measurement value (condensation temperature) detected by the condensation temperature detection means 25 and the measurement value detected by the sample vicinity temperature / humidity detection means 26 (in this embodiment, “temperature” as the measurement value). ), And a condensing temperature calculating means 27A for calculating the temperature / humidity that becomes the dew point temperature, and the cooler 11, the heater 12, and the humidifier 13 so as to control the presence / absence time of occurrence of condensation on the sample P. And the blower motor 18 of the blower 14 and the upper air volume switching damper 22 and the lower air volume switching damper 23 are driven to adjust the air volume from the temperature / humidity adjusting chamber 6 to the test chamber 5 and the temperature / humidity from the test chamber 5. Condensation presence / absence time control means 27B for controlling the amount of air to the chamber 6 is provided, and further, condensation presence / absence judgment means 27C for judging moisture on the surface of the sample P is provided.

Next, the operation of this embodiment will be described based on the flowchart of FIG.
As shown in FIG. 2, when the program of the control means 27 is started (step S01), first, whether or not the condensation selection operation switch 30 of the control panel 29 is on and whether or not to generate condensation on the surface of the sample P is determined. Judgment is made (step S02).
If this step S02 is YES and it is desired to generate dew condensation on the surface of the sample P, the measurement value (condensation temperature) detected by the condensation temperature detection means 25 and the measurement detected by the sample vicinity temperature / humidity detection means 26 A value (temperature) is input (step S03), and the measured value (condensation temperature) detected by the condensation temperature detection means 25 and the measurement value (temperature) detected by the sample vicinity temperature / humidity detection means 26 are set to the temperature. It is determined whether or not there is a difference, that is, the presence or absence of moisture on the surface of the sample P is determined (step S04).
If this step S04 is YES, there is a temperature difference between the measurement value (condensation temperature) detected by the condensation temperature detection means 25 and the measurement value (temperature) detected by the sample vicinity temperature and humidity detection means 26, and the surface of the sample P If there is dew condensation, the dew condensation time corresponding to the temperature difference is calculated (step S05), the drive means 24 is driven according to the calculated dew condensation time, and the upper air volume switching damper 22 and lower The side air volume switching damper 23 is operated individually or in combination to increase the amount of air from the temperature / humidity adjusting chamber 6 to the test chamber 5, and the humidifier 13 is weakened so as to obtain a predetermined humidity as required. Drive (step S06). In this case, even if the temperature of the air in the test chamber 5 is constant, a temperature gradient is generated on the surface of the sample P due to the humidity and the amount of air, and condensation occurs.
Then, it is determined whether or not constant dew condensation has occurred on the surface of the sample P (step S07). If this step S07 is NO, the dew condensation has occurred on the surface of the sample P. Returning to S05, the condensation time is recalculated so as to maintain the current humidity, and the process proceeds to step S06, where the upper air volume switching damper 22, the lower air volume switching damper 23, and the humidifier 13 are installed. To drive.
If this step S07 is YES, a constant condensation has occurred on the surface of the sample P, but it returns to the step S03 again to determine whether or not there is a constant condensation on the surface of the sample P. However, the upper air volume switching damper 22, the lower air volume switching damper 23, and the humidifier 13 are driven so that the dew condensation on the surface of the sample P is constant.

When the step S04 is NO, there is no temperature difference between the measurement value (condensation temperature) detected by the condensation temperature detection means 25 and the measurement value (temperature) detected by the sample vicinity temperature and humidity detection means 26, and the surface of the sample P When there is no condensation on the top, the no-condensation time is calculated (step S08), the driving means 24 is driven in accordance with the calculated no-condensation time, and the upper air volume switching damper 22 and the lower air volume switching damper 23 are operated. Individually or in combination, a small operation is performed to reduce the amount of air from the temperature / humidity adjusting chamber 6 to the test chamber 5, and the humidifier 13 is driven strongly so as to obtain a predetermined humidity as required (step S09). . In this case, even if the temperature of the air in the test chamber 5 is constant, a temperature gradient is generated on the surface of the sample P due to the humidity and the amount of air, and condensation occurs.
Then, it is determined whether or not constant dew condensation has occurred on the surface of the sample P (step S10). If this step S10 is NO, no dew condensation has occurred on the surface of the sample P. Returning to step S08, the non-condensing time is recalculated so as to maintain the current humidity, and the process further proceeds to step S09, where the upper air volume switching damper 22, the lower air volume switching damper 23, and the humidifier 13 is driven.
If this step S10 is YES, a constant condensation has occurred on the surface of the sample P, but it returns to the step S03 again to determine whether or not there is a constant condensation on the surface of the sample P. However, the upper air volume switching damper 22, the lower air volume switching damper 23, and the humidifier 13 are driven so that the dew condensation on the surface of the sample P is constant.

On the other hand, if step S02 is NO and it is not desired to cause condensation on the surface of the sample P, the measured value (condensation temperature) detected by the condensation temperature detection means 25 and the sample vicinity temperature and humidity detection means 26 are detected. The measured value (temperature) is input (step S11), and the measured value (condensation temperature) detected by the condensation temperature detecting means 25 and the measured value (temperature) detected by the sample vicinity temperature / humidity detecting means 26 are input. It is determined whether or not there is a temperature difference, that is, the presence or absence of moisture on the surface of the sample P is determined (step S12).
If this step S12 is YES, there is a temperature difference between the measurement value (condensation temperature) detected by the condensation temperature detection means 25 and the measurement value (temperature) detected by the sample vicinity temperature and humidity detection means 26, and the surface of the sample P If there is condensation on the surface, the condensation time is calculated according to the temperature difference (step S13), and the driving means 24 is driven according to the calculated condensation time to maintain the current state. In addition, the upper air volume switching damper 22 and the lower air volume switching damper 23 are opened individually or in combination to increase the air volume to the test chamber 5, and the dehumidification required by driving the equipment such as the cooler 11 or the like. To eliminate the condensation (step S14).
Then, it is determined whether or not condensation has disappeared (step S15). If this step S15 is NO and condensation still remains, the process returns to step S13 to return to the upper air volume switching damper 22 and the lower air volume switching damper. 23 is individually or combinedly opened to increase the amount of air to the test chamber 5, and necessary dehumidification is performed by driving devices such as the cooler 11 to eliminate condensation.
If this step S15 is YES, there is no condensation on the surface of the sample P, but the process returns to the step S11 again to determine whether or not there is constant condensation on the surface of the sample P. If there is, the upper air volume switching damper 22 and the lower air volume switching damper 23 and the humidifier 13 are driven so as to eliminate this condensation.
Further, when the step S12 is NO, there is no temperature difference between the measurement value (condensation temperature) detected by the condensation temperature detection means 25 and the measurement value (temperature) detected by the sample vicinity temperature / humidity detection means 26, and the sample P If there is no condensation on the surface, the no-condensation time is calculated (step S16), and the driving means 24 is driven in accordance with the calculated no-condensation time, so that the current state is maintained. The switching damper 22 and the lower air volume switching damper 23 are operated individually or in combination to reduce the amount of air from the temperature / humidity adjusting chamber 6 to the test chamber 5 (step S17), and the process returns to step S11.
The flow in FIG. 2 ends when the predetermined switch 31 of the control panel 29 is artificially turned off or when a predetermined test time has elapsed by the timer 27D of the control means 27.

  As a result, the amount of air from the temperature / humidity adjustment chamber 6 to the test chamber 5 is adjusted to accurately detect the presence or absence of moisture on the surface of the sample P and to control the arrival time of the presence or absence of condensation on the sample P. Therefore, the sample P can be kept in a certain state of dew condensation, and the corrosion test of the sample P can be properly performed.

  The corrosion testing machine according to the present invention can be applied to other testing machines.

1 Corrosion testing machine
2 Testing machine housing
3 Test chamber housing
4 Temperature / humidity adjustment chamber side housing
5 Test room
6 Temperature and humidity control room
7 division wall
8 Temperature and humidity adjustment path
9 Air circulation path
10 Partition
11 Cooler
12 Heater
13 Humidifier
14 Blower
21 Air volume switching mechanism
22 Upper air volume switching damper
23 Lower air volume switching damper
24 Drive means
25 Condensation temperature detection means
26 Sample temperature and humidity detection means
27 Control means
27A Condensation temperature calculation means
27B Condensation presence / absence time control means
27C Condensation presence / absence judging means
28 Temperature / humidity adjustment room temperature / humidity detection means
29 Control panel
30 Condensation selection switch

Claims (3)

  In a corrosion testing machine for performing a corrosion test of a sample, a plurality of samples are arranged in a test chamber, and a condensation temperature detecting means provided on one of the samples to detect the condensation temperature of water vapor on the surface of the sample, and this A sample vicinity temperature and humidity detection means for detecting temperature and humidity in the vicinity of the sample, and the sample based on the measurement value detected by the condensation temperature detection means and the measurement value detected by the sample vicinity temperature and humidity detection means A corrosion tester provided with a dew condensation presence / absence judging means for judging the presence / absence of moisture on the surface of the water.   A partition wall is provided to partition and form a test chamber in which a plurality of samples are disposed in a tester housing and a temperature / humidity adjustment chamber in which each device is disposed, and the temperature / humidity adjustment chamber includes at least a cooler as each device. A partition for partitioning a temperature / humidity adjustment path in which a heater, a humidifier, and a blower are arranged, and an air circulation path that communicates with the temperature / humidity adjustment path and allows air to circulate, is provided on the partition wall. And an air flow switching mechanism that operates so that the opening can be opened and closed. The presence / absence of moisture on the surface of the sample is determined by the dew condensation presence / absence determining means. 2. A control means is provided for controlling the amount of air from the temperature / humidity adjusting chamber to the test chamber by driving the air volume switching mechanism so as to control the time of occurrence or disappearance of condensation. Corrosion testing machine as described in.   The control means includes condensation temperature calculation means for calculating a temperature / humidity that becomes a dew point temperature based on the measurement value detected by the condensation temperature detection means and the measurement value detected by the sample vicinity temperature and humidity detection means, The cooler, the heater, the humidifier, and the blower are driven so as to control the time of occurrence or disappearance of condensation on the sample, and the air volume switching mechanism is driven to control the time from the temperature / humidity adjustment chamber. The corrosion tester according to claim 1 or 2, further comprising a dew condensation presence / absence time control means for adjusting an air amount to the test chamber.

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