JPH06148061A - Device for testing corrosion resistance - Google Patents

Abstract

PURPOSE:To efficiently repeat deterioration acceleration and AC resistance measurement on a test piece and, at the same time, to perform accurate measurement. CONSTITUTION:The main body of the title testing device is divided into an upper chamber which is used as a deterioration accelerating chamber 3 and lower chamber which is used as a measuring chamber 4 in which a measurement bath 4A is provided for measuring AC resistances and an elevating device 9 for elevating and lowering a partition member 20 which is opened or closed between both chambers 3 and 4 and a test piece between both chambers 3 and 4 is incorporated in the testing device. In addition, the upper surface of the member 20 is formed in a slope and a water receiver 24 is installed below the lower edge section of the slope. When deterioration acceleration is performed on the test piece while the member 20 is closed, water drops dropping down from the chamber 3 collide with the slope of the member 20, flow down on the slope, and are collected in the water receiver 24, with the collected water being discharged to the outside. Therefore, water drops dropping down from the chamber 3 do not get into and mix with the measurement bath 4a when the member 20 is opened and the test piece is brought down into the chamber 4 at the time of starting a measurement cycle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for testing corrosion resistance of conductive metal parts such as bolts and nuts.

[0002]

2. Description of the Related Art Corrosion resistance test of metal parts such as bolts and nuts is carried out by spraying salt water of 35 ± 1 ° C. onto a test piece and visually observing the time until rust (white rust or red rust) occurs. The quality of corrosion resistance is judged by the length of the. With this test method, corrosion of the test piece until rusting cannot be found, and there are individual differences in the evaluation of corrosion resistance. Also, two test pieces of the same type are soaked face to face in a measurement bath containing an environmental solution containing sulfuric acid, hydrochloric acid, etc., and a low-frequency alternating voltage of 10 to 100 mHz is applied to the two test pieces of the same type. There is a test method of measuring AC resistance between the test pieces as electrodes. In this test method, the measured alternating current resistance has a value close to the corrosion resistance of the test piece, so that the reciprocal of the corrosion resistance is measured, and it is possible to perform a quantitative evaluation over time.

Japanese Examined Patent Publication (Kokoku) No. 59-7003 discloses a test method for measuring AC resistance as described above at 1 KHz.
The above method of measuring the corrosion rate of the AC method is described in which the alternating current of high frequency and low frequency is superimposed and applied to a test piece, the impedance of high frequency and low frequency is measured, and the corrosion rate is calculated by calculating the reciprocal of the difference. Has been done. Also, JP-A-56-96
In Japanese Patent Laid-Open No. 233, a shutter that opens and closes is installed between an upper tank and a lower tank, which are arranged above and below the same tank, and a sample holder elevating device that elevates between the upper tank and the lower tank is provided. A combined cycle accelerated deterioration tester is described in which a tank is equipped with an irradiation lamp and salt spray equipment, and a lower tank is provided with a freezing equipment so that a weather resistance test and a freeze-thaw test can be performed in the same tank.

[0004]

The test method for measuring the AC resistance between the test pieces and calculating the corrosion rate described above allows quantitative evaluation, but the test method by the measuring bath (environmental solution) The deterioration state is different from the deterioration state of the test piece in the weather resistance test. Also, JP-A-56-9623
The test machine described in Japanese Patent Publication No. 3 can carry out a plurality of accelerated deterioration cycles such as a weather resistance test and a freeze-thaw test in the same tank. Therefore, even if it is possible to visually observe the occurrence of rust and the like, it is not possible to adopt the above-mentioned test method of measuring the AC resistance between the test pieces and calculating the corrosion rate. Because, we installed a salt spray nozzle for weathering test in the upper tank,
If the container for the measuring bath for measuring the AC resistance between the test pieces is installed in the lower tank, when the test piece accelerated in the upper tank is moved to the lower tank by opening the shutter, the salt water sprayed on the upper tank is used. Water droplets fall and mix in the measuring bath in the lower tank, and even a small amount changes the concentration of the measuring bath and causes an error in the measurement of the resistance value.

According to the present invention, the upper chamber is a deterioration promoting chamber, the lower chamber is provided with a measuring bath for measuring AC resistance, and a partition member for opening and closing is provided between the two chambers to promote deterioration of the test piece and the alternating current. The purpose of the present invention is to provide a corrosion resistance test device that can repeat the resistance measurement efficiently and prevent water droplets falling in the deterioration promoting chamber from mixing with the measurement bath installed in the lower chamber, enabling accurate measurement. To do.

[0006]

According to the present invention, the upper chamber of the same machine is a deterioration promoting chamber, and the lower chamber is a measuring chamber in which a measuring bath for measuring AC resistance between a pair of test pieces is installed. A partition member that opens and closes the space and a lifting device that moves a pair of test pieces up and down between the chambers are installed, or a water receiver is provided at the lower edge of the partition member with the upper surface as an inclined surface. Alternatively, it is a corrosion resistance test apparatus in which a draining member is arranged on the upper surface of the partition member and a water receiver is arranged below the end edge of the partition member.

[0007]

When the deterioration of the test piece with the partition wall member closed is accelerated, the water droplets dropped from the deterioration promoting chamber hit the inclined surface of the partition wall member and flow down to be collected in the water receiver or accumulated on the upper surface of the partition wall member. Water droplets are collected or drained by a water drain when the partition member is opened. Therefore, when the partition member is opened to lower the test piece into the measurement chamber and the measurement cycle is started, the water dropped from the deterioration promoting chamber does not drop into the measurement bath installed in the lower chamber and mix therewith.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 3 are explanatory views with a partial cross section showing the basic structure of a corrosion resistance test apparatus of the present invention. Figure 1
As shown in FIG. 3, the interior of the test apparatus body 1 is partitioned into upper and lower chambers by a partition wall 2 that opens and closes in the horizontal direction, and the upper chamber is used as the deterioration promoting chamber 3.
The salt spray nozzle 3b and the ultraviolet lamp 3c are installed inside, and the body 1 is provided with an observation window 3a. Lower chamber has a measuring bath 4A
A container in which is placed is set as a measurement chamber 4. An elevating device 9 is installed on the upper part of the machine body 1, and the elevating rod 9b is moved between the deterioration promoting chamber 3 and the measuring chamber 4 by the drive motor 9a, and the posture of the probe 10 attached to the tip of the elevating rod 9b is changed. It is controlled to rotate 90 degrees. A corrosion environment setting unit 5, an AC resistance measuring unit 6, a partition opening / closing unit 7, and a control unit 8 are attached to this corrosion resistance testing apparatus. As shown in FIG. 3, the probe 10 is made of a synthetic resin insulating material such as Teflon or vinyl and has a bifurcated shape 1.
1, and a conductive screw bush 12 made of metal such as stainless steel is embedded in each of the forked portions 11, and a lead wire 13 is connected to each screw bush 12. Probe 10
As test pieces, two bolts W of the same type are screwed together and attached so as to be electrically connected to the lead wires 13, respectively.

FIG. 1 shows a state in which the test bolt W is corroded in the deterioration promoting chamber 3. The partition opening / closing unit 7 is operated by the signal from the control unit 8 to close the partition 2 and the corrosive environment. Salt water is sprayed from the salt spray nozzle 3b in response to a signal from the setting unit 5, and the ultraviolet lamp 3c is turned on to corrode and deteriorate the test bolt W. The corrosion state of the test bolt W can be observed through the observation window 3a. After a lapse of a predetermined time, the spray from the salt water spray nozzle 3b is stopped, the ultraviolet lamp 3c is turned off, the partition opening / closing unit 7 is operated to open the partition 2, and the elevating device 9 is operated to lower the elevating rod 9b. At the same time, the probe part 10 attached to the tip of the
The probe 10 is turned downward to turn the probe 10 downward, and the test bolt W is immersed in the measuring bath 4A as shown in FIG. With a signal from the AC resistance measuring unit 6, a measurement AC voltage having an applied voltage of 15 mV and a frequency of 100 mHz is applied between two test bolts W, and the AC impedance is measured and recorded for a preprogrammed predetermined time. After measurement and recording for a predetermined time, the probe 10 is raised to the deterioration promoting chamber 3, the partition wall 2 is closed, and the test bolt W is deteriorated again. This deterioration acceleration and measurement cycle is repeated a predetermined number of times (for example, 10 times). Since the measured and recorded resistance value is inversely proportional to the corrosion rate of the test bolt W, the corrosion state can be quantitatively evaluated by calculation. Also,
By accumulating recorded data, life expectancy can be estimated in a short time.

As described above, the cycle of acceleration of deterioration and measurement can be efficiently repeated by moving the test piece up and down and opening and closing the partition 2 in the same machine body 1. However, when shifting to the measurement cycle, the partition 2 When the water droplets of salt water in the deterioration accelerating chamber 3 drop into the measuring chamber 4 when it is opened and mix with the measuring bath 4A, the concentration of the measuring bath 4A changes even with a small amount, and the AC resistance value can be accurately measured. Disappear. An embodiment of the present invention in which this measure is taken will be described. 4 to 6 are the same as those shown in FIGS. 1 to 3 in the basic constitution of the corrosion resistance test apparatus, but the constitutions of the partition wall and the measuring chamber are changed. The partition wall 20 is formed in a roof shape, and the two rails 21 and 21 are used to guide the aircraft 1 in the horizontal direction, and the tip of the rod 23 of the cylinder 22 is fixed to the end portion of the partition wall 20 to move back and forth. Let Water receivers 24 are installed at portions of the measurement chamber 4 facing the lower edges on both sides of the roof-shaped partition wall 20, and the lower portions of the water receivers 24 are connected to the drain outlet 25. When the deterioration of the test piece with the partition wall 20 closed is promoted, the water droplets of the salt water falling from the deterioration promoting chamber hit the inclined surface of the roof partition wall 20, and as shown by the arrows in FIGS. It flows down to the lower edge of the water, and it is dropped to each of the water receivers 24 installed in the measurement chamber so as to face the lower edge thereof. The salt water collected in each water receiver 24 is discharged to the outside of the machine body 1 through the drain port 25. Therefore, when the cylinder 22 is operated and the partition wall 20 is opened to shift to the measurement cycle, there is no risk that salt water mixes with the measurement bath 4A, and accurate measurement is performed.

As shown in FIG. 4, when the intake chamber 3d for dry air and the exhaust port 3e are provided in the deterioration promoting chamber and the partition 20 is opened to shift to the measurement cycle, the deterioration promoting chamber 3 is ventilated. There is also no fear that the spray vapor of salt water will mix with the measuring bath 4A. In addition, a stirrer 4a and a distilled water supply device 4b are installed in the container of the measurement bath 4A, and a thermometer, a heater, and a liquid level gauge (not shown) are further installed, and distilled water is collected by the amount of water evaporated in the measurement bath. If AC is measured while replenishing and stirring and keeping the temperature and concentration of the measuring bath 4A constant, the AC resistance value can be measured more accurately. It should be noted that when the test bolt W is immersed in the measuring bath 4A, air may collect at the head of the test bolt W serving as an electrode. However, this air pool should be removed by stirring the measuring bath with the stirrer 4a. And the temperature and concentration of the measuring bath become uniform. If the stirrer 4a is used as a jet nozzle and the measuring bath is blown onto the head of the test bolt W, the air pool can be removed more effectively.

Next, a second embodiment will be described with reference to FIG. The partition wall 30 has a single roof shape and is guided horizontally by a rail 31, and the tip of the rod 33 of the cylinder 32 is fixed to the end portion of the partition wall 30 to advance and retract. A water receiver 3 is provided at a portion of the measurement chamber 4 facing the lower edge of the single-sided partition 30.
4 is installed, and the salt water that has flowed down the slope of the single roof type partition 30 is collected and drained to the outside of the machine body. It is preferable to apply water-repellent processing to the slope of the partition wall 30.

A third embodiment will be described with reference to FIG. The partition wall 40 is formed in a flat plate shape so as to be guided horizontally by a rail 41, a water receiving wall 42 is projectingly provided at a tip end portion of the partition wall 40, and a draining wall 43 which is in contact with an upper surface of the partition wall 40 at a rear end side thereof.
To provide. Water receivers 44 are installed on both sides of the measurement chamber 4 (front and rear in the direction perpendicular to the plane of the drawing). When the partition wall 40 moves in the direction of the arrow in the figure when shifting to the measurement cycle, the salt water accumulated on the partition wall 40 is wiped off by the draining wall 43, and the salt water accumulated between the partition wall 40 and the water receiving wall 42 is It flows down to the water receivers 44 installed on both sides.

A fourth embodiment will be described with reference to FIG. The partition wall 50 has a single roof shape, and the rail 51 guides it in the direction perpendicular to the plane of the drawing, and the rod 52 of the cylinder advances and retracts in the direction perpendicular to the plane of the drawing. A water receiver 53 is installed along the lower edge of the single roof bulkhead 50, and salt water flowing down the slope of the single roof bulkhead 30 is collected in the water receiver 53, and the collected water is installed in the measurement chamber 4 below it. Discharge from the path 54 to the outside of the machine.

In the above embodiments, the case where the bolt is used as the test piece has been described. However, the test piece is not limited to the bolt, and if the part is made of a conductive material, a probe for conductively attaching it can be used. Can be tested.
Further, a motor or various cylinders can be appropriately used to drive the lifting device and the partition, and the upper surface of the partition is not limited to a flat one, but can be corrugated or V-shaped. The environment in the deterioration accelerating chamber may be a combined cycle of salt spray → dry → wet → open air introduction.

[0016]

EFFECT OF THE INVENTION The present invention promotes deterioration of a test piece by setting the upper chamber as a deterioration promoting chamber, installing a measuring bath for measuring AC resistance in the lower chamber, and providing a partition member for opening and closing between the two chambers. And the measurement of AC resistance can be repeated efficiently,
Accurate measurement is possible without the risk that salt water falling from the deterioration promoting chamber in the upper chamber will mix into the measuring bath installed in the lower chamber.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a basic configuration of the present invention.

FIG. 2 is an explanatory diagram at the time of measurement in FIG.

FIG. 3 is a cross-sectional view of a mounted state of the test piece.

FIG. 4 is a sectional view of the first embodiment.

5 is a cross-sectional view taken along line XX of FIG.

6 is a cross-sectional view taken along line YY of FIG.

FIG. 7 is a schematic sectional view of a second embodiment.

FIG. 8 is a schematic sectional view of a third embodiment.

FIG. 9 is a schematic sectional view of a fourth embodiment.

[Explanation of symbols]

1 Airframe 2 Partition 3 Degradation acceleration room 4 Measuring room 4A Measuring bath 5 Corrosion environment setting unit 6 AC resistance measuring unit 7 Partition opening / closing unit 8 Control unit 9
Lifting device 10 Probe 20 Roof type partition wall 24, 34,
44,53 Water receiver 30,50 Roof-shaped bulkhead 40 Flat bulkhead 4
3 Drain Wall W Test Bolt

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[Procedure amendment]

[Submission date] October 29, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

Japanese Examined Patent Publication No. 59-25456 discloses a test method for measuring AC resistance as described above, which is 1 KH.
There is a 2 AC method corrosion rate measuring method that superimposes high frequency and low frequency AC of z or more and applies it to a test piece, measures high frequency and low frequency impedance, and calculates the reciprocal of the difference to obtain the corrosion rate. Have been described. Also, JP-A-56-96
In Japanese Patent Laid-Open No. 233, a shutter that opens and closes is installed between an upper tank and a lower tank, which are arranged above and below the same tank, and a sample holder elevating device that elevates between the upper tank and the lower tank is provided. A combined cycle accelerated deterioration tester is described in which a tank is equipped with an irradiation lamp and salt spray equipment, and a lower tank is provided with a freezing equipment so that a weather resistance test and a freeze-thaw test can be performed in the same tank.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

[0006]

According to the present invention, the upper chamber of the same machine is a deterioration promoting chamber and the lower chamber is a measuring chamber in which a measuring bath for measuring AC resistance between at least a pair of test pieces is installed. A partition member that opens and closes the space and an elevating device that moves at least a pair of test pieces up and down between the chambers are installed, and an upper surface of the partition member serves as an inclined surface and a water receiver is disposed at a lower edge portion thereof. Alternatively, it is a corrosion resistance test apparatus in which a draining member is arranged on the upper surface of the partition member and a water receiver is arranged below the end edge portion of the partition member.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0015

[Correction method] Change

[Correction content]

In the above embodiments, the case where the bolt is used as the test piece has been described. However, the test piece is not limited to the bolt, and if the part is made of a conductive material, a probe for conductively attaching it can be used. Ki de be tested, or
The test pieces do not have to be in pairs, but may be in multiple pairs.
Yes. Further, a motor or various cylinders can be appropriately used to drive the lifting device and the partition, and the upper surface of the partition is not limited to a flat one, but can be corrugated or V-shaped. The environment in the deterioration accelerating chamber may be a combined cycle of salt spray → dry → wet → open air introduction.

Claims (2)

[Claims] 1. An upper chamber of the same machine is a deterioration accelerating chamber, a lower chamber is a measuring chamber in which a measuring bath for measuring an AC resistance between a pair of test pieces is installed, and a pair of partition members for opening and closing between the chambers. And a device for raising and lowering the test piece between the two chambers, the upper surface of the partition member is an inclined surface, and a water receiver is arranged at a lower edge portion thereof. 2. The upper chamber of the same machine is a deterioration accelerating chamber, the lower chamber is a measuring chamber in which a measuring bath for measuring AC resistance between a pair of test pieces is installed, and a pair of partition members for opening and closing between the chambers are paired. And a device for raising and lowering the test piece between the two chambers are installed, a draining member is provided on the upper surface of the partition member, and a water receiver is provided below an end edge of the partition member. Corrosion resistance test equipment.