Gas corrosion testing machine

Abstract

To provide a gas corrosion tester capable of saving resources during a gas corrosion test.SOLUTION: A gas corrosion tester comprises: a test tank; a gas supply pipe for supplying a corrosive gas into the test tank; and a gas exhaust pipe for exhausting the corrosive gas from the test tank, wherein a certain amount of corrosive gas is sealed in the test tank before the start of a test, and the test is started after the corrosive gas is circulated within the test tank.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a gas corrosion tester equipped with a test tank into which a corrosive gas is introduced.

Background Art

[0002] Generally, in a gas corrosion tester, a corrosive gas is introduced into a test tank on which a sample such as an electronic component is placed, and the corrosion resistance of the sample is evaluated. As a test procedure, for example, Non-Patent Document 1 describes that the inside of the test tank is stabilized at a specified temperature, humidity, and concentration of the corrosive gas before the start of the test. In particular, due to the property that the corrosive gas is adsorbed on the wall surface of the test tank etc., it may take a long time to stabilize the concentration of the corrosive gas. Currently, a method of stabilizing the concentration of the corrosive gas by continuously supplying the corrosive gas to the test tank is generally performed.

Prior Art Documents

Non-Patent Documents

[0003]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in such a gas corrosion tester, generally, resource saving during the gas corrosion test is required.

[0005] Therefore, it is desirable to provide a gas corrosion tester capable of achieving resource saving during the gas corrosion test.

Means for Solving the Problems

[0006] (1) A test tank, A gas supply pipe for supplying a corrosive gas into the test tank, A gas discharge pipe for discharging the corrosive gas from the test tank, Before the start of the test, a certain amount of corrosive gas is sealed into the test chamber. A gas corrosion testing machine that circulates corrosive gases within the test chamber before starting the test.

[0007] (2) A supply pipe valve is installed on the gas supply piping, A gas exhaust valve is installed on the gas exhaust piping, The test tank is equipped with a stirring blade, The gas corrosion testing machine described in (1) above, wherein corrosive gas is circulated in the test chamber by an agitator with the supply pipe valve and discharge pipe valve closed.

[0008] (3) Measure the concentration of the circulating corrosive gas, A gas corrosion testing machine as described in (1) or (2) above, which switches between supplying corrosive gas and circulating corrosive gas depending on the concentration of the corrosive gas.

[0009] (4) A bypass pipe is provided to connect the gas supply pipe and the gas discharge pipe, A gas corrosion testing machine as described in (1) to (3) above, which circulates corrosive gas in the test chamber through bypass piping.

[0010] (5) The gas corrosion testing machine described in (4) above, with a circulating fan installed on the bypass piping. [Effects of the Invention]

[0011] According to the gas corrosion testing machine of the present invention, a corrosive gas is supplied into the test chamber for a predetermined period before the start of the test, and the corrosive gas is circulated within the test chamber to stabilize the concentration of the corrosive gas before the test is started. As a result, the consumption of corrosive gas can be reduced. Therefore, it is possible to conserve resources during gas corrosion testing. [Brief explanation of the drawing]

[0012] [Figure 1] This is a schematic diagram showing a general configuration example of a gas corrosion testing machine according to the first embodiment of the present invention. [Figure 2]This is a schematic diagram showing a general configuration example of a gas corrosion testing machine according to a second embodiment of the present invention. [Modes for carrying out the invention]

[0013] Embodiments of the present invention will now be described in detail with reference to the drawings. In this specification, components having the same or similar functions are denoted by the same or similar reference numerals. In some cases, redundant descriptions of components denoted by the same or similar reference numerals may be omitted.

[0014] Furthermore, the position, size, and extent of each component shown in the drawings may not represent the actual position, size, and extent in order to facilitate understanding. Therefore, the disclosures in this application are not necessarily limited to the positions, sizes, and extents disclosed in the drawings.

[0015] [First Embodiment] Referring to Figure 1, a first embodiment of the gas corrosion testing machine will be described. Figure 1 schematically shows an example of the general configuration of a gas corrosion testing machine 1 according to the first embodiment, which circulates corrosive gas in a test chamber. The gas corrosion testing machine 1 includes a test chamber 10, a temperature control chamber 100, a gas supply pipe 11, a gas discharge pipe 12, a supply port 13, a discharge port 14, a supply pipe valve 17, a discharge pipe valve 18, a stirring blade 20, and a control unit 50.

[0016] The test tank 10 is, for example, a rectangular parallelepiped box composed of side walls, an upper plate, a bottom plate, etc. There is a supply port 13 on the bottom plate and a discharge port 14 on the upper plate, and it is surrounded by the side walls, upper plate, and bottom plate of the temperature control tank 100. The side walls, upper plate, and bottom plate of the test tank 10 are all spaced apart without contacting the side walls, upper plate, and bottom plate of the temperature control tank 100, and a space is formed between them. The space is filled with temperature-controlled air and is circulating. In the space inside the temperature control tank 100, a cooler and a heater (not shown) are provided. Also, the humidity inside the test tank 10 is adjusted using a humidifier (not shown). The test tank 10 is installed on a pedestal on the bottom plate of the temperature control tank 100 and is fixed, for example, by fasteners (not shown). Note that the test tank 10 and the temperature control tank 100 each have a door (not shown). This door is for putting in and taking out test pieces, etc.

[0017] The gas supply pipe 11 supplies corrosive gas into the test tank 10. One end of the gas supply pipe 11 is connected to the supply port 13 provided in the test tank 10, and the other end opposite to the one end is connected to a gas supply part (not shown). When the gas supply part operates, the corrosive gas flows through the gas supply pipe 11 and is supplied into the test tank 10. Examples of this corrosive gas include H2S (hydrogen sulfide gas), NO2 (nitrogen dioxide gas), Cl2 (chlorine gas), and SO2 (sulfur dioxide gas). Also, the gas supply part is composed of, for example, a corrosive gas container (not shown), an air supply part, and a gas mixer.

[0018] The gas discharge pipe 12 discharges the corrosive gas inside the test tank 10. One end of the gas discharge pipe 12 is connected to the discharge port 14 provided in the test tank 10, and the other end opposite to the one end is connected to an exhaust part (not shown). When the exhaust part operates, the corrosive gas inside the test tank 10 flows through the gas discharge pipe 12 and is exhausted to the outside from the exhaust part. This exhaust part is composed of, for example, an exhaust blower (not shown) and an exhaust treatment device.

[0019] The supply pipe valve 17 is provided on the gas supply pipe 11 and enables the opening and closing of the flow path from the gas supply part into the test tank 10.

[0020] The discharge pipe valve 18 is provided on the gas discharge pipe 12 and can open and close the flow path from the test tank 10 to the exhaust section.

[0021] When the supply pipe valve 17 and the discharge pipe valve 18 are in the open state, they connect the inside of the test tank 10, the gas supply section, and the exhaust section through the gas supply pipe 11 and the gas discharge pipe 12. When in the closed state, they seal the inside of the test tank 10.

[0022] The stirring blade 20 circulates the corrosive gas in the test tank 10. When the stirring blade 20 rotates in the test tank 10, the corrosive gas in the test tank 10 circulates as shown by the arrow in FIG. 1, for example.

[0023] The control unit 50 controls the operations of the supply pipe valve 17, the discharge pipe valve 18, and the stirring blade 20. Further, the control unit 50 also controls the operations of the cooler, the heater, and the humidifier.

[0024] [Operation and Effect of the First Embodiment] [Operation of the Gas Corrosion Tester 1] When performing a gas corrosion test on the gas corrosion tester 1, first, before the test starts, the cooler and heater in the temperature control tank 100 are controlled so that the atmosphere inside the test tank 10 reaches a predetermined temperature. At the same time, the humidity inside the test tank 10 is adjusted using the humidifier, and the stirring blade 20 is rotated. Next, corrosive gas is supplied from the gas supply section into the test tank 10 for a predetermined period (supply operation).

[0025] Next, the supply of corrosive gas from the gas supply section is stopped, the supply pipe valve 17 and the discharge pipe valve 18 are closed, and after sealing the inside of the test tank 10, the corrosive gas inside the test tank 10 is circulated by the stirring blade 20 to be stabilized (circulation operation).

[0026] After the concentration of corrosive gas in the test chamber 10 has stabilized, the stirring blade 20 is stopped, the test specimen is attached to a test specimen support member (not shown) in the test chamber 10 housed in the temperature control chamber 100, and the gas corrosion test is started.

[0027] (Effects of Gas Corrosion Tester 1) In the gas corrosion testing machine 1 according to the first embodiment, a corrosive gas is supplied into the test chamber 10 for a predetermined period before the start of the test, and then the supply of corrosive gas from the gas supply unit is stopped. Then, the supply pipe valve 17 and the discharge pipe valve 18 are closed to seal the inside of the test chamber 10, and the corrosive gas is circulated by the stirring blade 20 to stabilize the concentration of the corrosive gas inside the test chamber 10. As a result, the amount of corrosive gas consumed can be reduced.

[0028] Furthermore, by closing the supply pipe valve 17 and the discharge pipe valve 18, sealing the inside of the test tank 10, and then circulating the corrosive gas with the stirring blade 20, fluctuations in the temperature and humidity of the corrosive gas are reduced compared to the case where the corrosive gas is continuously supplied to the test tank, and the operation of the cooler, heater, and humidifier is reduced. As a result, the consumption of electricity and water can be reduced, thus enabling resource conservation during gas corrosion testing.

[0029] [Second Embodiment] Referring to Figure 2, a second embodiment of the gas corrosion testing machine will be described. Figure 2 schematically shows an example of the general configuration of a gas corrosion testing machine 1A according to the second embodiment, in which corrosive gas is circulated within the test chamber.

[0030] The gas corrosion tester 1A includes, in addition to the configuration of the gas corrosion tester 1 according to the first embodiment, a gas concentration meter 40, a bypass pipe 30, a switching valve 31, and a circulating blower 32. Note that repetitive explanations of matters already described in the first embodiment will be omitted.

[0031] The gas sampling tube 40 is a tube that penetrates the side walls of the test tank 10 and the temperature control tank 100, and is used to periodically check the components of the corrosive gas in the test tank 10. One end of the gas sampling tube 40 is connected to the test tank 10, and the other end, opposite to the first end, is connected to a measuring instrument (not shown). This measuring instrument measures the concentration of the corrosive gas.

[0032] The bypass pipe 30 connects the gas supply pipe 11 and the gas discharge pipe 12. One end of the bypass pipe 30 is connected to the gas supply pipe 11, and the other end, opposite to the first end, is connected to the gas discharge pipe 12.

[0033] The switching valve 31 is installed at the connection point between the gas discharge pipe 12 and the bypass pipe 30, and switches the corrosive gas flowing through the gas discharge pipe 12 to either a flow path to the bypass pipe 30 or a flow path to the exhaust section.

[0034] The circulating blower 32 is installed on the bypass piping 30 and efficiently sends the corrosive gas flowing through the bypass piping 30 to the gas supply piping 11.

[0035] The control unit 50 controls the switching valve 31 and the circulating blower 32 according to the concentration of corrosive gas measured by the gas sampling pipe 40 and a measuring instrument (not shown).

[0036] [Effects and Effects of the Second Embodiment] (Operation of gas corrosion tester 1A) When conducting a gas corrosion test in the gas corrosion tester 1A, first, before the test begins, the cooler and heater in the temperature control chamber 100 are controlled so that the atmosphere inside the test chamber 10 reaches a predetermined temperature. At the same time, the humidity inside the test chamber 10 is adjusted using a humidifier, and the stirring blade 20 is rotated. Next, corrosive gas is supplied into the test chamber 10 from the gas supply unit for a predetermined period (supply operation).

[0037] Next, the supply of corrosive gas from the gas supply unit is stopped, and the supply pipe valve 17 and discharge pipe valve 18 are closed to seal the inside of the gas corrosion tester 1A. Then the switching valve 31 is switched to the flow path to the bypass pipe 30, and the corrosive gas in the test tank 10 is circulated and stabilized by the stirring blade 20 and the circulation blower 32 (circulation operation).

[0038] At that time, the control unit 50 switches between supplying corrosive gas and circulating corrosive gas according to the concentration of corrosive gas in the test tank 10 measured by the gas sampling tube 40 and a measuring instrument (not shown).

[0039] After the concentration of corrosive gas in the test chamber 10 and the gas supply piping 11 has stabilized, the stirring blades 20 and the circulating blower 32 are stopped, the test specimens are attached to a test specimen support member (not shown) inside the test chamber 10, which is housed in the temperature control tank 100, and the gas corrosion test is started.

[0040] (Effects of Gas Corrosion Tester 1A) In the second embodiment, as in the first embodiment, the gas corrosion tester 1A according to the second embodiment supplies corrosive gas to the test chamber 10 and the gas supply piping 11 for a predetermined period before the start of the test, and then stops the supply of corrosive gas from the gas supply unit. Then, the supply piping valve 17 and the discharge piping valve 18 are closed to seal the inside of the gas corrosion tester 1A, and the switching valve 31 is switched to the flow path to the bypass piping 30, and the corrosive gas is circulated by the stirring blade 20 and the circulating blower 32 to stabilize the concentration of corrosive gas inside the gas corrosion tester 1A. Thus, the amount of corrosive gas consumed can be reduced.

[0041] Furthermore, by closing the supply piping valve 17 and the discharge piping valve 18 to seal the gas corrosion tester 1A, and then switching the switching valve 31 to the bypass piping 30, the corrosive gas is circulated by the stirring blade 20 and the circulating blower 32. Compared to the case where the corrosive gas is continuously supplied to the test chamber 10, fluctuations in the temperature and humidity of the corrosive gas are reduced, and the operation of the cooler, heater, and humidifier is reduced. As a result, the consumption of electricity and water can be reduced, thus enabling resource conservation during gas corrosion testing.

[0042] The gas corrosion tester 1A according to the second embodiment is equipped with a gas sampling tube 40 and a measuring instrument (not shown), which enables the measurement of the concentration of corrosive gas circulating in the test chamber 10. Therefore, the corrosive gas supply operation and the corrosive gas circulation operation can be switched according to the concentration of corrosive gas in the test chamber 10, enabling efficient circulation of corrosive gas in the gas corrosion tester 1A.

[0043] The gas corrosion testing machine 1A according to the second embodiment is equipped with a bypass pipe 30, which allows the corrosive gas discharged from the test tank 10 to return to the gas supply pipe 11 from the gas discharge pipe 12 through the bypass pipe 30 and be supplied back into the test tank 10, thereby circulating the corrosive gas. Therefore, since the corrosive gas is circulated not only within the test tank 10 but also including the gas supply pipe 11, the corrosive gas can be made to conform to the walls of the test tank 10 and the gas supply pipe 11, enabling efficient circulation of the corrosive gas in the gas corrosion testing machine 1A.

[0044] In the gas corrosion testing machine 1A according to the second embodiment, a circulating blower 32 is provided on the bypass piping 30, which allows the corrosive gas flowing through the bypass piping 30 to be efficiently sent to the gas supply piping 11. Therefore, the circulation of corrosive gas in the gas corrosion testing machine 1A can be performed efficiently.

[0045] The present invention has been described above with reference to embodiments, but the shapes and other details described in the above embodiments are illustrative, and the present invention is not limited to the above embodiments. For example, the arrangement position, shape, number, etc. of each component described in the above embodiments are illustrative, and are not limited to those described in the above embodiments. Furthermore, the invention may include components other than those described in the above embodiments, or it may not include some of the components described in the above embodiments.

[0046] Furthermore, in the schematic configuration examples of the present invention shown in Figures 1 and 2, the corrosive gas is shown being supplied from a supply port at the bottom of the test tank, but it may be provided at a different location. Specifically, for example, the corrosive gas may be supplied from the top of the test tank, and is not limited to the embodiments described above. [Explanation of Symbols]

[0047] 1,1A...Gas corrosion tester, 10...Test tank, 100...Temperature control tank, 11...Gas supply piping, 12...Gas discharge piping, 13...Inlet, 14...Discharge port, 17...Supply piping valve, 18...Discharge piping valve, 20...Agitator, 30...Bypass piping, 31...Switching valve, 32...Circulation fan, 40...Gas sampling tube, 50...Control unit.

Claims

1. Test tank and A gas supply pipe for supplying corrosive gas into the test tank, The test tank is equipped with a gas discharge pipe for discharging corrosive gases, A supply pipe valve is provided on the aforementioned gas supply pipe, A discharge pipe valve is provided on the aforementioned gas discharge pipe, The test tank is equipped with a stirring blade, Before the start of the test, a certain amount of corrosive gas is sealed into the test chamber. A gas corrosion testing machine in which the corrosive gas is circulated in the test chamber by the stirring blade with the supply pipe valve and the discharge pipe valve closed, and then the test is started.

2. The concentration of the corrosive gas circulating in the test chamber is measured. The gas corrosion testing machine according to claim 1, which switches between supplying corrosive gas and circulating corrosive gas depending on the concentration of the corrosive gas.

3. The system includes a bypass pipe connecting the gas supply pipe and the gas discharge pipe, The gas corrosion testing machine according to claim 1 or 2, wherein the corrosive gas in the test tank is circulated through the bypass piping.

4. The gas corrosion testing apparatus according to claim 3, wherein a circulating blower is provided on the bypass piping.

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