JP5497720B2 - Sample surface temperature sensor and corrosion tester using the sensor - Google Patents

Description

  The present invention relates to a sample surface temperature sensor and a corrosion tester using the sensor, and in particular, is affected by a temperature sensor that accurately grasps the temperature of the sample surface and a salt attached to the sample using the temperature sensor. In particular, the present invention relates to a corrosion tester for performing a corrosion test with a constant sample surface temperature.

There is a corrosion test as a means for evaluating the surface treatment and corrosivity of a metal material. Corrosion tests include a salt spray test and a combined cycle test combining test conditions such as salt spray, wetting, and drying, and many corrosion test machines for performing these corrosion tests have been developed.
This corrosion tester includes first and second humidity generators for introducing steam into the test chamber, means for spraying water on the test chamber wall to cool the air in the test chamber, When moving from a dry test to a wet test, there is a method of lowering the atmospheric temperature in the test tank in a short time and at the same time increasing the humidity by the circulation air path for adjusting the temperature of the air. (Patent Document 1)
In addition, the test chamber is divided into two parts, and the acid rain solution is sprayed on the sample in the test chamber with the lower test chamber divided by the partition plate with respect to the upper lamp chamber. During the acid rain solution spray, the lamp chamber is sprayed. Is maintained at a high temperature with the radiant heat of the light source and a heater, the partition plate is opened at the same time as spraying is stopped, and the temperature-controlled air in the lamp chamber is introduced into the test chamber, so that wetting with the artificial acid rain solution can be dried in a short time. There is one that can accelerate the corrosion caused by acid rain. (Patent Document 2)
In addition, there is a weather resistance test as a means for evaluating the quality of a sample by adapting to the natural environment and artificially promoting deterioration like a corrosion test. In the weather resistance test, light is applied to the sample from an artificial light source to examine the weather resistance of the sample.Because the temperature in the test tank differs from the sample surface temperature due to the radiant heat from the light source, a temperature representative of the sample surface temperature is set. A black panel thermometer to be measured is provided at the same position as the sample. (Patent Document 3)
From the idea of examining the influence of this radiant heat, there is a deterioration acceleration test method in which a sample surface temperature is measured and tested in a combined cycle tester combined with a light irradiation test. (Patent Document 4)
Moreover, in the test which heats a sample to high temperature, there exists what measures the temperature of a sample. (Patent Document 5)

JP-A-2005-37216 JP 7-20036 A JP 2002-195936 A JP-A-5-322741 JP 2007-212320 A

  In the conventional corrosion test, the temperature control during the test is performed based on the value obtained by measuring only the ambient temperature in the test tank with the temperature sensor in the test tank. In addition, there is no idea that there is a difference between the surface temperature of the sample and the ambient temperature in the test tank when a special test such as a test in which light is irradiated in a corrosion test or a test in which a sample is heated to a high temperature is not performed. The test was conducted with the recognition that the sample surface temperature was the same as the ambient temperature in the test chamber.

  However, in the corrosion test, there is a problem that a difference appears between the actual sample surface temperature and the ambient temperature in the test tank due to the influence of the salt adhering to the sample surface during the test. As described above, the phenomenon that the temperature of the sample surface is different from the atmospheric temperature in the test chamber is caused by the state change (condensation heat and evaporation heat) of the salt and salt water adhering to the sample surface during the test.

  For this reason, in a conventional corrosion test in which only the ambient temperature in the test tank was measured and temperature control was performed, it was not possible to detect that the temperature of the sample surface changed due to the influence of salt attached to the sample. . For this reason, the temperature difference between the atmospheric temperature in the test tank and the temperature of the sample surface could not be measured. In addition, even though the temperature of the sample surface is different from the ambient temperature in the test chamber, temperature control is performed only by the ambient temperature in the test chamber, and the reproducibility of the corrosion test is deteriorated. It was.

  This invention eliminates this drawback, enables the sample surface temperature sensor to accurately grasp the sample surface temperature, and conducts a corrosion test with the sample surface temperature kept constant without being affected by the salt adhering to the sample. It is possible to realize a corrosion tester capable of improving the reproducibility of the test.

  The sample surface temperature sensor according to the present invention includes a temperature sensor attached to a metal plate disposed at the same position as the sample in a corrosion test in which salt adheres to the sample in a test tank, and measures the surface temperature of the metal plate. It is characterized by.

  In the sample surface temperature sensor of the present invention, the metal plate has a surface having the same roughness as the sample, and the temperature sensor portion is covered with a waterproof and heat-proof material.

  Further, the sample surface temperature sensor according to the present invention is configured by a temperature sensor capable of measuring a temperature average value instead of a local temperature of the metal plate.

  Further, the corrosion testing machine of the present invention includes the above-described sample surface temperature sensor, a sample frame installed in the test tank and a sample frame on which the sample surface temperature sensor is placed, and humidity detection for detecting the humidity in the test tank. Means, a humidity adjusting mechanism that adjusts the humidity in the test chamber, a temperature adjusting mechanism that adjusts the temperature of the sample surface, and a humidity value detected by the humidity detecting means is a set test value. And a controller for controlling the temperature adjustment mechanism so that the value of the sample surface temperature sensor becomes a value of a set test condition.

By using the sample surface temperature sensor of the present invention, it is possible to grasp not only the atmospheric temperature in the test tank but also the temperature of the sample surface during the corrosion test.
As a result, the corrosion tester according to the present invention performs the cycle test because the temperature and humidity control is performed based on the measured value of the humidity in the test tank obtained by the humidity detecting means and the measured value of the sample surface temperature sensor. In this case, even if the amount of salt adhering to the sample surface is different, the test can be performed at the same sample surface temperature depending on the temperature and humidity conditions of each test, and the reproducibility of the test is improved.

It is a perspective view of a sample surface temperature sensor. (Example) It is a system block diagram of a corrosion tester. (Example)

  Embodiments of the present invention will be described below based on the drawings.

  1 and 2 show an embodiment of the present invention. In FIG. 1, a sample surface temperature sensor 1 includes a metal plate 2 and a temperature sensor 3. The metal plate 2 has a surface 4 having the same roughness as the sample 11. The temperature sensor 3 is disposed in close contact with the back surface 5 of the metal plate 2 and covered with the waterproof and heat-proof material 6, and can measure the temperature average value instead of the local temperature of the metal plate 2. The sample surface temperature sensor 1 can be placed at an arbitrary position on the sample frame 10 so that the sample surface temperature sensor 1 can be arranged close to the sample 11 placed on the sample frame 10. The sample surface temperature sensor 1 is installed in the vicinity of the sample 11, measures the temperature average value of the metal plate 2 having the surface 4 having the same roughness as the sample 11, and outputs it as the sample surface temperature.

  In FIG. 2, 7 is a corrosion tester. The corrosion testing machine 7 includes a test tank 8 and a lid 9 that closes the upper portion of the test tank 8, and a sample frame 10 is installed in the test tank 8. The sample 11 can be placed on the sample frame 10 at an arbitrary position.

  The corrosion tester 7 includes a salt spray mechanism 12 that sprays salt water into the test tank 8. The salt spray mechanism 12 has a solution reservoir 31 disposed below the sample frame 10 in the test tank 8, and a spray tower 13 that is inserted through the sample frame 10 and protrudes above the solution reservoir 31. ing. The spray tower 13 includes a spray nozzle 14 inside, and a spray port 15 at the upper end reaching the upper part in the test tank 8. The salt spray mechanism 12 sprays salt water in the solution reservoir 31 into the spray tower 13 with the spray nozzle 14 to generate salt water mist, and the generated salt water mist is fed into the test tank 8 from the spray port 15 at the upper end of the spray tower 13. It is naturally dropped and brought into contact with the sample 11 placed on the sample frame 10.

  Further, the corrosion tester 7 includes a humidifier 16 as a humidity adjustment mechanism for adjusting the humidity in the test tank 8. The humidifier 16 connects a humidifier body 17 installed outside the test tank 8 to the lower part of the test tank 8. The humidifier body 17 includes a heater 18 that heats water and generates steam. The humidifier 16 supplies the steam in the humidifier body 17 generated by the heater 18 to the test tank 8 and humidifies the air in the test tank 8.

  Further, the corrosion tester 7 includes a heater 19 as a temperature adjustment mechanism for adjusting the atmospheric temperature in the test tank 8. The heater 19 is provided with a heater body 20 extending in the vertical direction outside the test tank 8, the lower part of the heater body 20 is connected to the lower part of the sample frame 10 in the test tank 8, and the upper part is in the test tank 8. The sample frame 10 is connected to the upper part. The heater body 20 includes a heater 21 that heats air and a fan 22 that blows the heated air. The fan 22 is driven by a fan motor 23. The heater 19 introduces the air below the test tank 8 into the heater body 20, heats it with the heater 21, and sends it out above the test tank 8 with the fan 22.

  The corrosion testing machine 7 includes a dry bulb temperature sensor 24 that measures the dry bulb temperature in the test tank 8, and a wet bulb temperature sensor 25 that measures the wet bulb temperature in the test tank 8. The corrosion testing machine 7 includes a cleaning nozzle 26 that cleans deposits of the dry bulb temperature sensor 24 and the wet bulb temperature sensor 25. The cleaning nozzle 26 injects cleaning liquid sent from a cleaning liquid container (not shown), and cleans the dry bulb temperature sensor 24 and the wet bulb temperature sensor 25.

  Further, the corrosion testing machine 7 includes a sample surface temperature sensor 1. The corrosion testing machine 7 is composed of a plurality of metal plates 2 having different roughness surfaces 4 so that the surface 4 having the same roughness as the sample 11 to be tested can be arbitrarily selected for the sample surface temperature sensor 1. The sample surface temperature sensor 1 is provided.

  The corrosion testing machine 7 includes a control unit 27 that controls the humidifier 16 and the heater 19. The controller 27 is connected to the heater 18 of the humidifier 16 via a humidifier power regulator 28, and is connected to the heater 21 of the heater 19 via a heater power regulator 29. The dry bulb temperature sensor 24 and the wet bulb temperature sensor 25 are connected via a humidity converter 30.

  The control unit 27 obtains the dry bulb temperature and the wet bulb temperature measured by the dry bulb temperature sensor 24 and the wet bulb temperature sensor 25 by converting the measured values of the dry bulb temperature and the wet bulb temperature into humidity using the humidity converter 30, and based on the obtained humidity. The heater 18 of the humidifier 16 is controlled by the humidifier power regulator 28 so that the humidity in the test tank 8 becomes a set value. In addition, the control unit 27 controls the heater 21 of the heater 19 with the heater power regulator 29 so that the surface temperature of the sample 11 becomes a set value based on the value measured by the sample surface temperature sensor 1.

Next, the operation will be described.
When performing a cycle test of the sample 11 in the test tank 8 by the corrosion tester 7, for example, a salt spray test, a drying test, and a wet test, the metal plate 2 having the surface 4 having the same roughness as the sample 11 to be tested. Is selected, and the selected sample surface temperature sensor 1 is placed side by side with the sample 11 and placed on the sample frame 10.

  The corrosion tester 7 measures the ambient temperature in the test tank 8 with the dry bulb temperature sensor 24 by the control unit 27 when the sample 11 is subjected to the cycle test under different test conditions, and the dry bulb temperature sensor 24 and the wet bulb. The humidity is calculated by the humidity converter 30 based on the measured value of the temperature sensor 25, and the humidifier 16 is controlled so that the humidity in the test tank 8 becomes a set value. At the same time, the corrosion tester 7 measures the temperature average value of the metal plate 2 of the sample surface temperature sensor 1 aligned with the sample 11 by the control unit 27 and controls the heater 19 so that the measured value becomes a set value. To do.

  Thus, the corrosion tester 7 measures the ambient temperature in the test tank 8 with the dry bulb temperature sensor 24 when the cycle test is performed, and further the temperature of the metal plate 2 having the surface 4 having the same roughness as the sample 11. Since the average value is measured by the sample surface temperature sensor 1, not only the ambient temperature in the test chamber 8 but also the temperature of the sample surface can be grasped during the test.

  As a result, the corrosion testing machine 7 has the inside of the test chamber 8 based on the dry bulb temperature and wet bulb temperature measured by the dry bulb temperature sensor 24 and the wet bulb temperature sensor 25 and the temperature average value measured by the sample surface temperature sensor 1. Since the temperature and humidity control is performed, the same sample surface temperature depends on the temperature and humidity conditions of each test even when the amount of salt adhering to the sample surface is different during the cycle test of the salt spray test, drying test, and wet test. And the test reproducibility is improved.

  Further, the corrosion tester 7 can also perform a test by controlling the atmospheric temperature in the test tank 8.

  In the present invention, during the cycle test, even if the amount of salt adhering to the sample surface is different, the test can be performed at the same sample surface temperature depending on the temperature and humidity conditions of each test, and the test reproducibility is improved. Yes, it can be applied not only to a corrosion test in which a cycle test is performed, but also to a corrosion test in which the test is performed independently.

DESCRIPTION OF SYMBOLS 1 Sample surface temperature sensor 2 Metal plate 3 Temperature sensor 4 Surface 5 Back surface 6 Waterproof heat-proof material 7 Corrosion test machine 8 Test tank 9 Lid 10 Sample frame 11 Sample 12 Salt spray mechanism 13 Spray tower 14 Spray nozzle 15 Spray port 16 Humidifier DESCRIPTION OF SYMBOLS 17 Humidifier main body 18 Heater 19 Heater 20 Heater main body 21 Heater 22 Fan 23 Fan motor 24 Dry bulb temperature sensor 25 Wet bulb temperature sensor 26 Washing nozzle 27 Controller 28 Humidifier power regulator 29 Heater power regulator 30 Humidity Converter 31 Solution reservoir

Claims (1)

In a corrosion test in which salt adheres to a sample in a test tank,
A sample frame placed in the test chamber for placing the sample,
A sample surface temperature sensor that attaches a temperature sensor to a metal plate and detects changes in temperature due to the influence of salt adhering to the sample surface;
Humidity detecting means for detecting the humidity in the test chamber;
A humidity adjusting mechanism for adjusting the humidity in the test chamber;
A temperature adjustment mechanism for adjusting the temperature in the test chamber;
Ri Do from a control unit,
A plurality of the sample surface temperature sensors composed of metal plates having different roughness surfaces;
When conducting the test,
Select the sample surface temperature sensor composed of a metal plate having a surface with the same roughness as the sample to be tested and place it on the sample frame side by side with the sample,
Controls the humidity adjusting mechanism so that the value of the detected humidity is a value of the set test condition by <br/> said humidity detecting means by said control unit,
A corrosion tester characterized in that the temperature adjustment mechanism is controlled so that a value of the sample surface temperature sensor becomes a value of a set test condition.

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