JP4920726B2 - Gas corrosion test equipment - Google Patents

Description

  The present invention relates to a gas corrosion test apparatus, and more particularly to a gas corrosion test apparatus that can perform a temperature and humidity cycle test and can automatically adjust a gas concentration in a single or multiple gas test.

  For gas corrosion resistance testing equipment for testing gas corrosion resistance of electronic parts, plated products, and other products, gas corrosion is performed by contacting two or more kinds of corrosive gases with the sample installed in the test chamber. There is a test apparatus (Patent Document 1).

  In the gas corrosion test apparatus, when condensation occurs, the gas is dissolved in the generated condensed water and the gas concentration is unstable.To solve this problem, the moisture of the corrosive gas used in the gas corrosion test is reduced. Gas corrosion tester to be removed (Patent Document 2), a humidifying tank is installed in the other path with respect to the air path communicating with the test tank, and both paths are mixed and switched to communicate with the test tank. There is a humidity adjustment device (Patent Document 3) of an environmental test device that adjusts the temperature of the air.

  In addition, an environmental test tank (Patent Document 4) that adjusts the temperature inside the test tank by injecting a temperature-adjusted liquid into a water-containing material that covers the outside of the test tank; There is a weather resistance test apparatus (Patent Document 5) that adjusts the humidity in a test tank with a humidity device and causes condensation of a constant particle size on a sample.

Utility model registration No. 3108729 Patent No. 2990167 Patent No. 2990170 Patent No. 2975601 Japanese Patent No. 2944244

  The conventional gas corrosion test apparatus has a problem that the reproducibility of the test is poor because condensed water is generated in the test tank, and the corrosive gas is dissolved in the condensed water and the gas concentration is not stable. For this reason, in order to prevent condensation in the test tank, the technology to remove moisture from the corrosive gas used in the test and the air path and the path through the humidifier are mixed and switched to communicate with the test tank. A technique for adjusting the humidity is used, but the lid forming the test tank and the seal part of the lid and the main body are in contact with the outside air, so the temperature drops from that part, for example, a temperature of 40 ° C. Depending on the test conditions, such as when tested at a humidity of 95% RH, dew condensation occurred on the wall surface in the test tank.

  In the conventional gas corrosion test equipment, when a temperature / humidity cycle test that changes the temperature and humidity is performed, condensed water is generated in the test tank when the temperature and humidity change, and the corrosive gas dissolves in the condensed water. Since the gas concentration was not stable, the gas corrosion test could not be performed while performing the temperature and humidity cycle test.

  For this reason, in the conventional gas corrosion test apparatus, the temperature shock that the sample actually receives in the natural environment, such as the temperature difference between day and night repeated in the outdoor natural environment and the temperature difference between the outdoor and indoor environments. Although there was an idea of performing a temperature / humidity cycle test to reproduce the above, it was actually difficult to perform the temperature / humidity cycle test.

  In addition, the indirect heating method that heats from the outer periphery of the test tank causes overshoot and undershoot in the transition temperature because the temperature in the test tank greatly lags the temperature of the constant temperature bath (air jacket) at the outer periphery of the test tank. Due to this, condensation occurs on the wall in the test chamber. For this reason, if a gas corrosion test is performed while performing a temperature / humidity cycle test by the indirect heating method, the corrosive gas dissolves in the condensed water generated on the wall surface in the test tank, and the gas concentration is unstable, There was a fear that the reproducibility of the test results was not good due to the delay in temperature rise.

  Furthermore, since the conventional gas corrosion test apparatus is not provided with the dew condensation prevention means with respect to the wall surface in a test tank, it could not prevent dew condensation. Further, the occurrence of condensation may occur not only on the test tank plane but also on the sample, but it was not possible to confirm the presence or absence of condensation on the sample. For this reason, the test results differ depending on the presence or absence of condensation on the sample surface, and there is a problem that the reproducibility of the test is poor.

Furthermore, in a gas corrosion test apparatus that performs a gas corrosion test with two or more kinds of corrosive gases, H ₂ S and SO ₂ are simultaneously supplied to perform a test while automatically controlling the concentration of each gas in the test tank. There was no. This is because there is no measuring device for measuring the concentration of _{H 2} S directly, when measuring the concentration of _{H 2} S is the _{H 2} S is reacted with _{O 2} converted to SO _{2 (2H 2} S + 3O ₂ → 2SO ₂ + 2H ₂ O) and measured with an SO ₂ measuring instrument. However, if the H _{2 S} and SO ₂ are mixed in the gas to be measured, because the result is mixed to have SO ₂ also measured, the measured value is not the concentration of the pure H _{2 S,} H _{2 S} There has been a problem that the concentration of is measured higher than actual.

  This invention can perform a gas corrosion test in a gas atmosphere in which the gas concentration is always controlled while performing a temperature and humidity cycle test without causing condensation on the wall surface in the test tank. An object of the present invention is to realize a gas corrosion test apparatus capable of improving the stability of concentration and the reproducibility of test results.

According to a first aspect of the present invention, there is provided means for supplying at least one kind of corrosive gas into a test tank having means for controlling temperature and humidity and controlling the concentration of the corrosive gas to a predetermined set concentration. In the gas corrosion test apparatus for performing the gas corrosion test of the sample by bringing the corrosion gas into contact with the sample installed in the test tank, the test tank is partitioned by the inner wall, and the outer wall surrounds the test tank. A thermostatic chamber is defined, and a gas supply device is provided that adjusts and supplies at least one type of corrosive gas to be supplied into the test tank so as to have a predetermined set concentration, and the temperature in the test tank is set to a predetermined level. A test for adjusting the steam supplied to the test tank so that the humidity in the test tank becomes a predetermined set humidity, including a thermostat temperature adjusting device that adjusts the temperature of the air supplied to the thermostat so as to reach a temperature. Tank Comprising a humidity control device, the temperature of a thermostat regulator, the provided evenly distributed supply air volume regulator air to each part of the constant temperature bath, the temperature of a thermostat regulating device other the temperature of the test tank when shifting to the set temperature, the before temperature of the test tank reaches the other setting temperature was adjusted air temperature supplied to the constant-temperature bath on the basis of the temperature within the test chamber, the test chamber After the temperature reaches the other set temperature, the temperature of the air supplied to the thermostat is adjusted based on the temperature in the test bath and the temperature in the thermostat , and the concentration of the corrosive gas and the test bath are adjusted. The temperature and humidity are set so as not to cause dew condensation on the wall of each wall under at least one condition, and the test under the set condition is repeated once or a plurality of times and repeated every predetermined temperature transition time. Characterized by performing a humidity cycle test .

  According to a second aspect of the present invention, the test tank is defined by an inner wall, a thermostatic chamber is defined by an outer wall so as to surround the entire test tank, and at least one type of corrosive gas supplied into the test tank is predetermined. A thermostat temperature adjusting device for adjusting the temperature of the air supplied to the thermostat so that the temperature in the test tank is a predetermined set temperature. And a test bath humidity adjusting device that adjusts steam supplied to the test bath so that the humidity in the test bath becomes a predetermined set humidity, and the thermostatic bath temperature adjusting device has air in each part of the thermostatic bath. The temperature control device of the constant temperature bath distributes and distributes the temperature evenly when the temperature in the test bath is shifted to another set temperature, the temperature in the test bath reaches another set temperature. The temperature inside the test chamber is The temperature of the air supplied to the thermostatic chamber is adjusted based on the temperature, and after the temperature in the test bath reaches another set temperature, the temperature is supplied to the thermostatic bath based on the temperature in the test bath and the temperature in the thermostatic bath. It is characterized by adjusting the air temperature.

According to a second aspect of the present invention, there is provided a dew condensation sensor for detecting the dew condensation state of the sample set in the test tank, and a condition for dew condensation on the sample by detecting the dew condensation state of the sample during the preliminary test and / or no dew condensation It is characterized by having a condensation amount setting / display device that sets and confirms the condition of the condition and sets the conditions according to the presence or absence of condensation during the test based on the value.

According to a third aspect of the present invention, the humidity control apparatus for the test tank supplies steam supplied to the test tank so that a difference between a wall surface temperature in the test tank and a dew point temperature in the test tank converges to a set value. It is characterized by adjusting.

According to a fourth aspect of the present invention, the gas supply device includes a gas supply means for supplying three kinds of corrosive gases of SO ₂ , NO ₂ , and H ₂ S to the test tank, and SO ₂ , NO by the gas supply means. ₂ and a gas supply amount adjusting means for adjusting the gas supply amount of H ₂ S, and the gas supply amount adjusting means independently measures the gas concentrations of SO ₂ and NO ₂ taken out from the test tank. In addition, SO ₂ and NO ₂ by the gas supply means are set so that the respective gas concentrations of SO ₂ and NO ₂ in the test tank become predetermined set concentrations based on the independently measured gas concentrations of SO ₂ and NO _2. along with adjusting the gas supply amount, the H _{2 S} removal from the test chamber and allowed to react with O ₂ is converted to SO _2, the converted SO ₂ gas concentration was measured, converted measured in SO ₂ after Measure gas concentration alone Determine the gas concentration of H _{2 S} alone by an electronic circuit for correcting a gas concentration of SO ₂ were, to set the concentration gas concentration is in a predetermined H _{2 S} in the test tank based on the gas concentration of H _{2 S} obtained The gas supply amount of H ₂ S by the gas supply means is adjusted to be as follows.

  In the gas corrosion test apparatus according to claim 1 of the present invention, since there is no condensation on the inner wall of the test tank during the temperature and humidity cycle test, the gas corrosion test of the sample can be performed in a stable gas atmosphere. A certain gas corrosion test suitable for the actual environment is possible.

In the gas corrosion test apparatus according to claim 1 of the present invention, no condensation occurs in the test tank, so that the stability of the gas concentration in the test tank and the reproducibility of the test results can be improved, and the running cost can be reduced. Also contribute. In addition, when changing the temperature in the test chamber to another set temperature, the control method of the air temperature supplied to the thermostatic chamber is changed before and after reaching the other set temperature, causing condensation on the inner wall of the test chamber. It is possible to shorten the transition time to another set temperature without causing it to occur. As a result, the number of cycle tests per unit time can be increased.

According to the gas corrosion test apparatus of the second aspect of the present invention, it is possible to perform the test by selecting the presence or absence of dew condensation on the sample, and it is possible to perform a test that matches the purpose of use of the sample.

The gas corrosion test apparatus according to claim 3 of the present invention can prevent condensation on the wall surface in the test tank even during the temperature and humidity cycle test.

The gas corrosion test apparatus according to claim 4 of the present invention can automatically adjust the gas concentrations of the three types of corrosive gases of SO ₂ , NO ₂ , and H ₂ S, so that the accuracy and reproducibility of the test can be improved. .

It is a system block diagram of a gas corrosion test apparatus. It is a top view of the air volume regulator part of a gas corrosion test apparatus. It is a perspective view of an air volume adjuster. It is a top view of a gas corrosion test apparatus. It is a front view of a gas corrosion test apparatus. It is sectional drawing by the VI-VI line of the gas corrosion test apparatus of FIG. It is a front view of a gas concentration automatic controller. It is a side view of a gas concentration automatic controller. It is a front view of the air volume regulator part of a gas corrosion test apparatus.

This invention prevents the occurrence of condensation on the wall surface in the test tank under a gas atmosphere whose concentration is controlled in the test tank, and performs the gas corrosion test of the sample while performing the temperature and humidity cycle test. .
Hereinafter, description will be given based on the drawings.

  1 to 8 show an embodiment of the present invention. 4 to 6, reference numeral 1 denotes a gas corrosion test apparatus, 2 denotes a frame, and 3 denotes a main body. The gas corrosion test apparatus 1 has a main body 3 mounted on a gantry 2. The main body 3 includes a test unit 4, a control unit 5, and an exhaust unit 6.

  The test section 4 has a double wall structure composed of an inner wall 7 and an outer wall 8, a test tank 9 is partitioned by the inner wall 7, and a thermostatic chamber 10 is partitioned by the outer wall 8 so as to surround the test tank 9. The inner wall 7 is formed into a square box shape by a square plate-like inner wall bottom portion 11, a square cylindrical inner wall measuring portion 12 and a square plate-like inner wall upper portion 13, and a sample S is taken into and out of the test chamber 9 from the inner wall measuring portion 12. An inner wall door 14 is provided. The outer wall 8 is formed in a square box shape by a square plate-like outer wall bottom portion 15, a square cylindrical outer wall measuring portion 16 and a square plate-like outer wall upper portion 17, and the outer wall for accessing the outer wall measuring portion 16 to the inner wall door 14. A door 18 is provided.

  In the test chamber 9, a sample frame 19 for placing the sample S is provided below, a sample suspension rod 20 for suspending the sample S is provided above the sample frame 19, and stirring is performed to stir the gas at the bottom below the sample frame 19. Wings 21 are provided. The stirring blade 21 is attached to the upper end of the stirring shaft 22 that extends from the inner wall bottom portion 11 into the lower outer frame 2. The lower end of the stirring shaft 22 is connected to a stirring motor 23 installed in the gantry 2.

The control unit 5 includes a power switch 24, a control panel 25, a test program setting device 26, an operation time meter 27, a recorder (gas concentration 3 points, dry bulb temperature, humidity, condensation) 28, a temperature deviation controller (test). A tank wall temperature and a wet bulb temperature) 29, a gas flow rate setting device (SO ₂ , NO ₂ , H ₂ S, air) 30, and a dew condensation amount setting / display device 31 are provided.

  The exhaust unit 6 is provided with an exhaust treatment device 32, an exhaust blower 33, and a gas leak alarm operation panel 34. As shown in FIG. 1, the exhaust treatment device 32 detoxifies the corrosive gas discharged from the exhaust port 35 in the test tank 9 to the exhaust pipe 36 and discharges it to the outside by the exhaust blower 33. The exhaust blower 33 is driven by an exhaust motor 37 and sucks the test tank 9 during the corrosion test, thereby bringing the inside of the test tank 9 into a negative pressure state.

  As shown in FIG. 1, the gas corrosion test apparatus 1 performs a gas corrosion test of a sample S by bringing a corrosion gas into contact with the sample S installed in the test tank 9. A compartment is formed, and a constant temperature bath 10 is partitioned by the outer wall 8 so as to surround the test bath 9.

  The gas corrosion test apparatus 1 includes a gas supply device 38 that adjusts and supplies the corrosive gas supplied into the test tank 9 so as to have a predetermined set concentration, and the temperature in the test tank 9 becomes a predetermined set temperature. A test bath temperature for adjusting the steam supplied to the test bath 9 so that the humidity in the test bath 9 becomes a predetermined set humidity is provided. An adjustment device 40 is provided.

The gas supply unit 38 includes gas supply means 41 for supplying three types of corrosion gases, SO ₂ , NO ₂ , and H ₂ S, as corrosion gases, to the test tank 9, and SO ₂ , NO ₂ by the gas supply means 41. And gas supply amount adjusting means 42 for adjusting the gas supply amount of H ₂ S.

The gas supply means 41 includes an SO ₂ cylinder 43, a NO ₂ cylinder 44, and an H ₂ S cylinder 45 that store three kinds of corrosive gases of SO ₂ , NO ₂ , and H ₂ S, and supplies air for gas dilution. An air supply 46 is provided. One end side of the gas supply pipe 47 is branched and connected in parallel to each of the cylinders 43 to 45 and the air supply unit 46. The gas supply pipes 47 are gathered in the middle, and the other end side is connected to a gas supply port 48 provided on the inner wall bottom 11 in the test tank 9. The gas supply pipes 47 immediately downstream of the cylinders 43 to 45 are respectively provided with an SO ₂ supply amount adjustment valve 49, an NO ₂ supply amount adjustment valve 50, and an H ₂ S supply amount adjustment valve 51. An air supply amount adjustment valve 52 is provided in the gas supply pipe 47 immediately downstream of the air supply unit 46.

The gas supply means 41 supplies SO ₂ , NO ₂ , and H ₂ S from the SO ₂ cylinder 43, NO ₂ cylinder 44, and H ₂ S cylinder 45 to the SO ₂ supply amount adjustment valve 49, NO ₂ supply amount adjustment valve 50, H _2. Each of the S ₂ , NO ₂ , and H ₂ S that is adjusted and taken out by the S supply amount adjusting valve 51 is diluted with the air that is taken out from the air supply device 46 after being adjusted by the air supply amount adjusting valve 52, and the gas supply pipe 47 is supplied to the test tank 9 from the gas supply port 48.

The gas supply amount adjusting means 42 is provided with a gas dehumidifier 55 in the middle of a gas extraction pipe 54 connected at one end to a gas outlet 53 provided in the wall portion 12 of the test tank 9, and the other end of the gas extraction pipe 54. The side is branched and connected in parallel to the SO ₂ concentration measuring device 56 and the NO ₂ concentration measuring device 57, and is connected in parallel to the SO ₂ concentration measuring device 59 via the H ₂ S—SO ₂ converter 58. . The SO ₂ concentration measuring device 56 and the NO ₂ concentration measuring device 57 are connected to the SO ₂ controller 60 and the NO ₂ controller 61, respectively. The SO ₂ concentration measuring device 59 is connected to the H ₂ S controller 63 via the H ₂ S concentration correcting device 62 connected to the SO ₂ concentration measuring device 56. The SO ₂ controller 60, the NO ₂ controller 61, and the H ₂ S controller 63 are connected to the SO ₂ supply amount adjustment valve 49, the NO ₂ supply amount adjustment valve 50, and the H ₂ S supply amount adjustment valve 51. .

The gas supply amount adjusting means 42 measured each of the SO ₂ and NO ₂ gas concentrations in the mixed gas taken out from the test tank 9 by the SO ₂ concentration measuring device 56 and the NO ₂ concentration measuring device 57 independently. each gas concentration of SO _2, NO ₂ entering the SO ₂ controller 60, NO ₂ controller 61. Based on the measured gas concentrations of SO ₂ and NO ₂ , the SO ₂ controller 60 and the NO ₂ controller 61 each have a predetermined set concentration for each of the SO ₂ and NO ₂ gases in the test tank 9. As described above, the SO ₂ and NO ₂ gas supply amounts are adjusted by driving the SO ₂ supply amount adjusting valve 49 and the NO ₂ supply amount adjusting valve 50 of the gas supply means 41 by the gas supply amount control signal.

Further, the gas supply amount adjusting means 42 converts H ₂ S in the mixed gas taken out from the test tank 9 to O ₂ by the H ₂ S—SO ₂ converter 58 and converts it into SO ₂ (2H ₂ S + 3O ₂ → 2SO ₂ + _{2H 2} O), and the gas concentration of SO ₂ converted from _{H 2} S is measured by the SO ₂ concentration meter 59. This measured value includes the concentration of SO ₂ present alone in the mixed gas. Therefore, the gas supply amount adjusting means 42, the concentration of _{H 2} S corrector 62, the converted gas concentration of SO ₂ was the SO ₂ concentration meter 59 was measured, a single of SO ₂ concentration meter 56 has measured SO The gas concentration of H ₂ S alone is obtained by correcting with the gas concentration of ₂ (converted SO ₂ gas concentration−single SO ₂ gas concentration). Based on the gas concentration of H _{2 S} obtained, so that the gas concentration of H _{2 S} in the test chamber 9 becomes a predetermined set density, H _{2 S} feed amount adjustment of the gas supply means 41 by the gas supply amount control signal The valve 51 is driven to adjust the gas supply amount of H ₂ S.

As a result, the gas corrosion test apparatus 1 has three types of corrosive gases (SO ₂ , NO ₂ , H ₂ S) supplied into the test tank 9 by the gas supply means 41 and the gas supply amount adjustment means 42 of the gas supply apparatus 38. ) Can be automatically adjusted and supplied so as to have a predetermined set density, respectively, so that the accuracy and reproducibility of the test can be improved.

The gas supply amount adjusting means 42 of the gas supply device 38 is configured separately from the gas corrosion test device 1 as a gas concentration automatic controller 64 as shown in FIGS. The gas concentration automatic controller 64 includes a gas dehumidifier 55, an SO ₂ concentration measuring device 56, an NO ₂ concentration measuring device 57, an H ₂ S-SO ₂ converter 58, an SO ₂ concentration measuring device 59, an SO ₂ in the main body 65. ₂ controller 60, NO ₂ controller 61, H ₂ S concentration corrector 62, and H ₂ S controller 63 are incorporated. In addition, the gas concentration automatic adjuster 64 includes an SO ₂ concentration adjuster 66, a NO ₂ concentration adjuster 67, and an H ₂ S concentration adjuster 68.

  As shown in FIG. 1, the thermostatic chamber temperature adjusting device 39 defines a temperature adjusting passage 70 extending in the vertical direction by a partition wall 69 in a constant temperature bath 10 which is a later measurement of the test tank 9. The temperature adjustment passage 70 communicates with the thermostatic chamber 10 at the upper end and the lower end, and a cooler 72 connected to the refrigerator 71 and a heater 74 connected to the power source 73 are sequentially arranged from the bottom to the top. Has been established. A circulation fan 76 driven by a circulation motor 75 is disposed at the upper end of the temperature adjustment passage 70.

  The cooler 72 and the heater 74 are connected to a program temperature controller 77. The program temperature controller 77 is connected to a thermostat temperature setter 78 and the test program setter 26. Connected to the thermostatic chamber temperature setting device 78 is a thermostatic chamber temperature measuring device 79 for measuring the temperature in the thermostatic chamber 10 provided in the front blowing part 82 of the air volume regulator 81 described later. Connected to the test program setter 26 is a dry and wet bulb temperature measuring device 80 for measuring the dry bulb temperature and wet bulb temperature provided in the test tank 9.

  The program temperature controller 77 inputs the thermostat temperature set by the thermostat temperature setter 78 and the temperature of the thermostat 10 measured by the thermostat temperature measurer 79, and is set by the test program setter 26 and set in the test tank The temperature and the wet and dry bulb temperature measured by the wet and dry bulb temperature measuring device 80 are input, and the cooler control signal and the heater control signal are set so that the temperature in the test tank 9 becomes a predetermined set temperature based on the input temperatures. Thus, the cooler 72 and the heater 74 are driven to adjust the temperature of the thermostatic chamber 10.

  The program temperature controller 77 switches the control method after the temperature in the test tank 9 reaches the set temperature of the test program setter 26, and controls the heater with a signal of only the set value of the test program setter until then. The heater circuit is controlled by a signal from the thermostat temperature setter 78.

  As a result, the gas corrosion test apparatus 1 controls the heater temperature based on the two signals of the setter 26 and the constant temperature chamber temperature setter 78 after the program temperature controller 77 reaches the set temperature of the test tank 9 with respect to the air temperature supplied to the constant temperature chamber 10. By switching to, the test tank 9 is indirectly heated and cooled by adjusting the temperature to be equal to or higher than the set temperature of the test tank 9, and the temperature inside the test tank 9 is adjusted to a predetermined set temperature. be able to.

  The thermostatic bath temperature adjusting device 39 includes an air volume regulator 81 that uniformly distributes and supplies the air blown out by the circulating blower 76 to each part of the thermostatic bath 10. The air volume regulator 81 is disposed in the thermostatic chamber 10 between the inner wall upper portion 13 and the outer wall upper portion 17.

  As shown in FIGS. 2 and 3, the air volume adjuster 81 is disposed at the rear side blowing portion 82 disposed on the rear side (circulation fan side) above the test tank 9 and the central portion above the test tank 9. An air volume adjusting passage 85 formed in a substantially H shape in plan view is provided by the central outlet 83 and the front outlet 84 disposed on the front side (outer door side) above the test tank 9. .

  The rear outlet 82 is provided with an inlet 87 that is connected to the air outlet 86 of the circulation fan 76 and introduces air into the air volume adjusting passage 85, and the air supplied to the air volume adjusting passage 85 is supplied to the rear side of the test tank 9. A rear outlet 88 that blows downward toward the constant temperature bath 10 is provided. The central outlet 83 has a central outlet 89 that blows the air supplied to the air volume adjustment passage 85 downward toward the upper surface 13 of the test tank 9, and each measurement toward the side of the constant temperature bath 10 on both sides of the test tank 9. Measuring outlets 90 and 91 are provided. The front air outlet 84 is provided with a front air outlet 92 that blows the air supplied to the air volume adjusting passage 85 downward toward the thermostat 10 on the front side of the test tank 9. Each opening 88-92 sets each opening area so that it may become the optimal blowing amount.

  As a result, the gas corrosion test apparatus 1 can evenly distribute and supply the air blown out by the circulating blower 76 to each part of the thermostatic chamber 10 by the air volume regulator 81, and make the temperature of each part of the thermostatic bath 10 the same. The temperature in the test tank 9 can be stabilized at the set temperature.

  The constant temperature bath temperature adjusting device 39 is used when the test program setter 26 (temperature adjuster 77) shifts the temperature in the test bath 9 from the current set temperature to another set temperature. Before and after reaching the other set temperature, the air temperature supplied to the thermostat 10 is adjusted as follows. The constant temperature bath temperature adjusting device 39 is configured to set the test program setter 26 (temperature adjustment) based on the temperature in the test bath 9 measured by the wet and dry bulb temperature measuring device 80 before the temperature in the test bath 9 reaches another set temperature. The temperature of the test chamber 9 measured by the wet and dry bulb temperature measuring device 80 is adjusted after the temperature of the air supplied to the thermostatic chamber 10 is adjusted by the device 77) and the temperature in the test chamber 9 reaches another set temperature. The temperature of the air supplied to the thermostat 10 is adjusted based on the temperature in the thermostat 10 measured by the thermostat 79.

  Thereby, the gas corrosion test apparatus 1 suppresses the overshoot and undershoot due to the delay in the transition of the temperature of the test tank 9 with respect to the transition of the temperature of the thermostat 10 at the time of temperature transition, which is peculiar to the indirect heating type, and performs the test in a short time The temperature of the tank 9 can be stabilized, and condensation on the wall surface in the test tank 9 caused by overshoot and undershoot can be prevented.

  In the test tank humidity adjusting device 40, a humidity generator 93 is connected to a humidity supply port 95 on the bottom 11 of the inner wall of the test tank 9 by a humidity supply pipe 94. The humidity generator 93 is connected to the test program setter 26. The humidity controller 96 inputs the temperature of the test tank 9 set by the test program setting unit 26 and the wet and wet bulb temperature measured by the wet and dry bulb temperature measuring device 80, and the test tank 9 is based on the input humidity and temperature. The humidity generator 93 is driven by a humidity control signal to adjust the humidity of the thermostatic chamber 10 so that the humidity inside becomes a predetermined set humidity. Thereby, the gas corrosion testing machine 1 can adjust the vapor | steam supplied to the test tank 9 so that the humidity in the test tank 9 may become predetermined | prescribed setting humidity.

  This test tank humidity adjusting device 40 is configured so that the difference between the wall surface temperature in the test tank 9 and the dew point temperature in the test tank 9 converges to the set value from the wet and dry bulb temperature measured by the wet and dry bulb temperature measuring device 80. The steam supplied to the test tank 9 is adjusted. For example, the test tank humidity adjusting device 40 obtains a difference Δt (t1−t2) between the wall surface temperature t1 in the test tank 9 and the dew point temperature t2 in the test tank 9 by the humidity controller 94, and the difference Δt is a set value. In the above case, the humidity generator 91 is driven, and when the difference Δt is within the set value, the humidity generator 90 is stopped to adjust the steam supplied into the test tank 9. The dew point temperature is obtained from the wet and dry bulb temperature measured by the wet and dry bulb temperature measuring device 80 or is obtained from a dew point temperature measuring device (not shown) disposed in the test tank 9. Thereby, the gas corrosion test apparatus 1 can prevent condensation on the wall surface in the test tank 9 even during the gas corrosion test.

  In this way, the gas corrosion test apparatus 1 adjusts the concentration of the corrosive gas supplied into the test tank 9 to a predetermined set concentration, and condensation occurs on the wall surface of the inner wall 7 forming the inside of the test tank 9. The gas corrosion test of the sample S can be performed in a gas atmosphere whose concentration is controlled in the test tank 9 while performing a temperature and humidity cycle test in which the temperature and humidity are changed so that the gas does not match the actual environment. Corrosion test is possible.

  In addition, since the gas corrosion test apparatus 1 does not cause condensation in the test tank 9, it can improve the stability of the gas concentration in the test tank 9 and the reproducibility of the test results, and dissolve the gas in the condensed water. Therefore, the gas consumption can be reduced and the running cost can be reduced.

  The gas corrosion test apparatus 1 further includes a dew condensation sensor 97 for detecting the dew condensation state of the sample S installed in the test tank 9, and the dew condensation sensor 97 is connected to the test program setter 26 to use the corrosive gas. This test that uses the corrosive gas based on the condition that the dew condensation sensor 97 detects the dew condensation state of the sample S during the preliminary test and sets / checks the condition for dew condensation on the sample S and / or the condition without dew condensation The condensation amount setting / display unit 31 is provided for setting and displaying conditions according to the presence or absence of condensation. Thus, the gas corrosion test apparatus 1 can perform a test by selecting whether or not the sample S has dew condensation, and can perform a test that matches the purpose of use of the sample S.

  Note that the air volume adjuster 81 described above can also be configured as shown in FIG. The air volume adjuster 81 shown in FIG. 9 is configured to guide the air introduced into the air volume adjusting passage 85 from the air outlet 86 of the circulation blower 76 through the inlet 87 to the rear outlet 88 of the rear outlet 82. Side guide plates 98 are provided, and side guide plates 99 and 100 are provided to guide the side outlets 90 and 91 of the central outlet 83.

  The air volume adjuster 81 shown in FIG. 9 has a rear air outlet 88 and side air outlets 90 and 91 at positions where it is difficult for air to flow with respect to the flow direction of the air introduced into the air volume adjusting passage 85 by the inlet 87. Since air can be actively guided to each other, the air can be more evenly distributed and supplied to each part of the constant temperature bath 10, and the temperature of each part of the constant temperature bath 10 can be made the same. The temperature can be stabilized at the set temperature.

The invention is explained in more detail by means of examples.
(Example 1) A printed circuit board of an electronic circuit was used as a sample.
Set test conditions, transition time, and number of tests.
Set to test condition 1 with temperature: 25 ° C., humidity: 60% RH, corrosive gas and concentration SO ₂ : 1 ppm, NO ₂ : 1 ppm, H ₂ S: 8 ppm, test time: 1 hour, sample surface: no condensation
Set to test condition 2 with temperature: 60 ° C., humidity: 95% RH, corrosive gas and concentration SO ₂ : 1 ppm, NO ₂ : 1 ppm, H ₂ S: 8 ppm, test time: 1 hour, sample surface: no condensation
Transition time: 1 hour, number of tests: set to 100 times, and gas corrosion test was performed. As a result, the corrosive gases SO ₂ , NO ₂ , and H ₂ S were kept at the set concentration without causing condensation in the test tank. The gas corrosion test could be performed as it was.

(Example 2) A printed circuit board of an electronic circuit was used as a sample.
Set test conditions, transition time, and number of tests.
Set to test condition 1 with temperature: 25 ° C., humidity: 60% RH, corrosive gas and concentration SO ₂ : 1 ppm, NO ₂ : 1 ppm, H ₂ S: 8 ppm, test time: 1 hour, sample surface: with condensation,
Test condition 2 is set such that temperature: 60 ° C., humidity: 95% RH, corrosive gas and concentration SO ₂ : 1 ppm, NO ₂ : 1 ppm, H ₂ S: 8 ppm, test time: 1 hour, sample surface: with condensation,
When the gas corrosion test was performed by setting the transition time: 1 hour and the number of tests: 100 times, dew condensation occurred only on the sample surface, and there was no dew condensation in the test tank outside the sample surface. _{2. A} gas corrosion test could be performed while keeping NO ₂ and H ₂ S at the set concentrations.

  This invention performs a gas corrosion test of a sample in a gas atmosphere whose concentration is controlled in the test tank while performing a temperature and humidity cycle test so that condensation does not occur on the wall surface in the test tank. It can be applied to a reproducible corrosion test apparatus conforming to

DESCRIPTION OF SYMBOLS 1 Gas corrosion test apparatus 9 Test tank 10 Constant temperature tank 32 Exhaust treatment apparatus 33 Exhaust blower 38 Gas supply apparatus 39 Constant temperature tank temperature adjustment apparatus 40 Test tank humidity adjustment apparatus 41 Gas supply means 42 Gas supply amount adjustment means 43 SO ₂ cylinder 44 NO ₂ cylinder 45 H ₂ S cylinder 46 air supply 49 SO ₂ supply amount adjustment valve 50 NO ₂ supply amount adjustment valve 51 H ₂ S supply amount adjustment valve 52 air supply amount adjustment valve 56 SO ₂ concentration measuring instrument 57 NO ₂ concentration measurement 58 H ₂ S-SO ₂ converter 59 SO ₂ concentration measuring device 60 SO ₂ controller 61 NO ₂ controller 62 H ₂ S concentration corrector 63 H ₂ S controller 70 temperature adjustment passage 72 cooler 74 heater 76 circulation Blower 77 Program temperature controller 78 Temperature chamber temperature setting device 79 Temperature chamber temperature measuring device 80 Wet and wet bulb temperature measuring device 81 Air volume Seiki 93 humidity generator 96 humidity regulator 97 condensation sensor

Claims (4)

Supplying at least one type of corrosive gas into a test tank having means for controlling temperature and humidity, and providing means for controlling the corrosive gas concentration to a predetermined set concentration,
In the gas corrosion test apparatus for performing the gas corrosion test of the sample by bringing the corrosion gas into contact with the sample installed in the test tank,
The test tank is partitioned by an inner wall,
A constant temperature bath is defined by an outer wall so as to surround all the test baths,
A gas supply device for adjusting and supplying at least one type of corrosive gas to be supplied into the test tank so as to have a predetermined concentration ;
A thermostat temperature adjusting device for adjusting the temperature of the air supplied to the thermostat so that the temperature in the test tank is a predetermined set temperature ;
A test tank humidity adjusting device for adjusting the steam supplied to the test tank so that the humidity in the test tank becomes a predetermined set humidity ;
The thermostatic chamber temperature adjusting device includes an air volume regulator that distributes and distributes air evenly to each part of the thermostatic chamber ,
When the temperature control device of the thermostatic bath shifts the temperature in the test bath to another set temperature, the temperature in the test bath is based on the temperature in the test bath before reaching the other set temperature. After adjusting the temperature of the air supplied to the thermostat and the temperature in the test bath reaches another set temperature, the air supplied to the thermostat based on the temperature in the test bath and the temperature in the thermostat Adjust the temperature,
The concentration of the corrosive gas;
A set value of temperature and humidity to prevent condensation on the wall of the test tank is set under at least one condition,
A gas corrosion test apparatus characterized by performing a temperature / humidity cycle test in which the test under the set conditions is combined once or a plurality of times and repeated every predetermined temperature transition time. A dew condensation sensor for detecting the dew condensation state of the sample set in the test chamber;
Set and check the conditions for detecting the dew condensation state of the sample during the preliminary test and / or the condition for dew condensation on the sample.
The gas corrosion test apparatus according to claim 1 , further comprising a dew condensation amount setting / display device for setting and displaying conditions according to the presence or absence of dew condensation during the test based on the value. The test tank humidity adjusting device adjusts steam supplied to the test tank so that a difference between a wall surface temperature in the test tank and a dew point temperature in the test tank converges to a set value. Item 2. The gas corrosion test apparatus according to Item 1 . The gas supply device includes gas supply means for supplying three kinds of corrosive gases of SO ₂ , NO ₂ , and H ₂ S to the test tank, and gas supply of SO ₂ , NO ₂ , and H ₂ S by the gas supply means. Gas supply amount adjusting means for adjusting the amount,
The gas supply amount adjusting means independently measures each gas concentration of SO ₂ and NO ₂ taken out from the test tank, and based on each gas concentration of SO ₂ and NO ₂ measured independently, While adjusting the gas supply amounts of SO ₂ and NO ₂ by the gas supply means so that the respective gas concentrations of SO ₂ and NO ₂ become predetermined set concentrations,
SO a H _{2 S} removal from the test chamber and allowed to react with O ₂ is converted to SO _2, the gas concentration of the converted SO ₂ were measured, the gas concentration of the measured SO ₂ converted was measured by the single The gas concentration of H ₂ S alone is obtained by an electronic circuit that corrects with the gas concentration of _{2, and} the gas concentration of H ₂ S in the test tank becomes a predetermined set concentration based on the obtained gas concentration of H ₂ S. gas corrosion test apparatus according to claim 1, characterized in that adjusting the amount of gas supplied H _{2 S} by the gas supply means.

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