TW534985B - Salt water spray test device - Google Patents

Abstract

This invention provides a neutral salt water spray testing device, which is capable of easily maintaining the PH value of the spray solution in the range of 6.5 to 7.2 by anyone, so as to improve its reliability. The testing device is provided with a salt water supply tank, a floating board floating on the surface of the testing salt solution in the supply tank, a testing salt solution reservoir, a shortest pipe connecting the salt water supply tank and the testing salt solution reservoir, a steam generator and a float type testing salt solution reservoir in a spray tower, a silicone resine tube connecting a spray liquid collecting container and a messcylinder, and a hard PVC pipe connecting the salt water supply tank and the testing salt solution reservoir, the device is capable of preventing an acidic substance from solving into the testing solution.

Description

534985 Description of the Invention ([Technical Field of the Invention] (Please read the precautions on the back before filling out this page) This invention is a salt water spray test device used for corrosion test, especially for using a neutral salt solution as a corrosion test solution The neutral salt spray test device with PH7 as the neutral salt spray device. In the present invention, the so-called salt spray test device refers to a continuous salt spray test device and an intermittent salt spray test device. The so-called intermittent salt spray test device, That is, the combined cycle salt water spray test device is a device for intermittently spraying salt water to perform a salt water spray test. The device is provided with a machine that sends dry air and humid air into a test tank. [Known technology] The salt water spray test system sprays corrosive liquid. The detailed test process is to test the corrosion of the test subject. The detailed solution is to introduce the test solution, which is the corrosive solution of the test salt solution storage tank, from the salt water supply tank, and spray the mist from the spray nozzle to the test tank together with saturated air from the spray nozzle In this way, the mist is naturally dropped from above and comes into contact with the test piece arranged in the tank. Then, the test piece is made of the mist Promote rotten rice. Printed in a neutral salt spray test device by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs, as specified in JJSZ2371: 2000. The test salt solution is 25 soil 2 ° C, and the conductivity is 20 // S / Deionized water or distilled water below cm dissolves the special-grade sodium vaporization and adjusts it to a salt concentration of 50,000 to 5 g / L. The pH is adjusted by using a sodium hydroxide or hydrochloric acid solution of lnlOi / L to make the spray The spray solution taken at this time becomes pH 6.5 to 7.2. In addition, the spray solution taken during spraying must be in the range of pH 6.5 to 7.2. In addition, the temperature of the salt solution storage tank for the test is sprayed with neutral saline. The fog test must be maintained at 3 5 soil 2 ° C. The pH value of the spray solution used during spraying is measured after the test. The paper size is in accordance with China National Standard (CNS) A4 (210 X 297 mm). ) 1 312682 > 34985 Α7 Β7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs This paper is printed in accordance with Chinese National Standard (CNS) A4 (210 X 297 public love) 2 5. Description of the invention (2 Retention in spray liquid Use the solution pH value of the container. Open the test tank, so measure the value of the solution {) 11 remaining in the spray liquid collection cylinder from the spray liquid collection container through the piping. [The problem to be solved by the invention] In the conventional salt water spray test device, the test When spraying with a salt solution adjusted to a pH of 6 · 5 to 7 · 2, the spray solution used becomes acidic. For this problem, the salt water spray test device described in Japanese Patent Application Laid-Open No. 57_125342, It is characterized by including a device for removing air pollutants in the air such as an aqueous solution of sodium hydroxide, and the device is used to supply air in which air pollutants have been removed in advance to a test tank and an air supply device. However, air purification according to related chemical methods has cost and space problems due to the additional cleaner. The inventors of the present invention have developed a salt water spray test device for Japanese Patent Application No. 2000-1108584 which reduces carbon dioxide through the adsorbent. However, the use of physicochemical methods to remove carbon dioxide also has cost and space problems due to the additional adsorption tower. In addition, as instructed by JIS Z 2371: 2000, treatments such as adjusting the salt solution for testing to alkaline are performed. However, when the test salt solution is adjusted to be alkaline or the like, there is a problem that the test salt solution must be adjusted based on experience. Therefore, the present invention provides a salt water spray test device with excellent reliability 'to solve the above-mentioned problems of the conventional technology, control the device manufacturing cost' and take up no space, which is easy for any tester , 312682 -------------------- Order --------- (Please read the precautions on the back before filling this page) W4985 、 Invention description ( 3) Developed for the purpose of keeping the spray liquid taken by the mist capture & within the range of pH 6 · 5 to 7'2. 1 [Solution to Problem] The present inventors and others' concentrated on the results of the review to achieve the above-mentioned purpose. The reason for the acidification of the spray liquid used in the Erming spray f was that the test salt solution and the mist of the mist were caused by the long-term air Time contact, so the carbon dioxide in the air is dissolved and the test salt / synthetic solution is used, and it is dissolved from the piping that passes the salt solution for the test into the miscellaneous field. The contact of the salt solution with acidic substances is also effective in terms of cost and space. 2. The present invention is a salt water spray test device, which is completed based on relevant knowledge. It is characterized by having a mechanism to prevent acidic substances from dissolving in the salt solution. In this article, "acidic substance" refers to a substance that dissolves in water and shows acidity. In the present invention, the acidic substance is characterized by carbon dioxide in the air. In addition, it is characterized in that the acidic substance is an acidic eluted substance derived from a pipe. In the present invention, the mechanism for preventing the acidic substance from being dissolved in the salt solution is characterized in that a floating plate is floated on the water surface of the test M solution in the brine supply tank. The present invention is a salt water spray test device with the above characteristics. The salt water spray test device uses a neutral salt solution as a corrosion test solution and a neutral salt spray test centered at pH 7 to protect the relay solution. -. & Paper size applies Chinese National Standard (CNS) A4 regulations & (210 X 297 public love) --- ^ -_________ 312682 (Please read the note on the back? Matters before filling out this page) r ---- ---- Order --------- Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 3 534985

V. Description of the Invention (4 The pH value of 4 is printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs, and the test salt solution in the salt water supply tank is used to shield the salt solution from contact with the air, and ^ 1 tube will The salt solution is sent directly to the spray tower to prevent the acidic substance from dissolving in the salt ridge solution, which will cause the pH value of the solution to be changed. The area of the floating plate is best to cover the entire test salt solution. y According to the experiments of the sun, the moon and the others, in addition to the floating plate floating on the water surface of the test salt solution in the salt water replenishment tank as described above, the steam generator is equipped with a steam generator that fits steam into the test tank and the spray tower is installed. The test salt solution storage tank with a float-type on-off valve is not equipped with the water level adjustment tank for the test salt solution storage tank. It is learned that the pH value of the spray solution used during spraying is more difficult to become acidic. The mechanism for dissolving the acidic substance in the salt solution may not be provided with a floating plate, and only has a steam generator for sending steam into the test tank, and a test salt solution with a floating ball valve in the spray tower. The storage tank does not include a salt solution storage tank with a water level adjustment tank for testing. The present invention also provides a salt spray test device, which uses a neutral salt spray with a neutral salt solution as the corrosion test solution and a pH 7 as the center. In the test device, in order to maintain the pH of the test solution at the completion of production, a floating plate is floated in the salt water supply tank, and the test salt solution from the salt water supply tank is stored in a spray tower, and the spray A float-type on-off valve is installed in the tower as a salt solution storage tank for the test, instead of setting a water level adjustment tank for the test salt solution storage tank outside the test tank to shield the contact between the salt solution and the air. The pH value of the salt solution caused by the medium is applicable to the Chinese National Standard (CNS) A4 specification ⑵q x 297 public love) ----- 312682 ------------------- --Order --------- (Please read the notes on the back before filling this page)

534985 V. Description of the invention (5 changers) In the middle of this month, set the piping length of the salt water supply tank and the test salt solution storage tank to be shorter than the conventional device of the same size. The material that dissolves the ionic substance into the salt solution is used as the piping material for connecting the spray solution taking container and the spray solution taking measuring cylinder and / or the piping material connecting the salt water supply tank and the test salt solution storage tank. The above materials are preferably Silicone_resin or hard vinyl chloride. The above materials can also be pTFE or PET, Fpm, PEEK, PDFE, modified PPE. [Example] The present invention will be described in more detail with reference to the drawings according to the following examples. Figure 1 is applicable A partially broken schematic front view of a structural example of the salt water spray testing apparatus of the present invention. The structure of the apparatus of the embodiment of the structural example shown in FIG. 丨 is used as a neutral salt solution of the residue test solution. In a salt water spray test device, the test tank (10) is heated and maintained at the test temperature by a steam generator (1), and is supplied from the salt water supply tank (13) through the spray liquid pipe (3) to the spray tank. The salt solution of the test salt solution storage tank (5) in the tower (9) is provided with a float-type on-off valve (6), which is sprayed from the spray nozzle (8), and from the nozzle mist tower (9). The air saturator (7) sprays the saturated air together into the test tank (10), and the salt spray of the corrosion test is performed by allowing the mist to naturally fall from above and contact the test piece (11) arranged in the tank. The test device (12) adopts the spray liquid collecting container (14) to take the sprayed mist, and then introduces the spray paper through the pipe (4) connected to a part of the spray liquid taking container (14). The size of the paper is suitable for China. Standard (CNS) A4 specification (210 X 297 mm), 312682 ------ ilk --------- tr --------- 1 (Please read the precautions on the back first (Fill in this page again) Printed by the Employees ’Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 5 534985 Printed by the Employees’ Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 6 A7 V. Description of the Invention (6) Mist liquid take-up cylinder ⑴) The salt water replenishing tank (13) is filled with the salt solution for testing, and a floating plate (16) floats on the water surface. Fig. 2 is a characteristic diagram of the aging change of the pH value of the test salt solution in the brine supply tank. In this figure, the curve of the comparative example is a result of measuring the pH value of the test salt solution in a salt water replenishing tank of a conventional salt water spray test device. The curve of Example 1 is a result of measuring the dissolved salt value of the test salt in the salt water replenishing tank in the salt water spray test device of Example i of the present invention. In Figure 2, Figure 3, and Figure 5, between the two parallel one-point key lines, that is, the pH value is 6.5 to 72. The dry range refers to the range of the pH value of the spray liquid used for spraying as specified by JIS. In the comparative example, 14 hours after the salt mouth spray test was started, the test salt solution in the salt water supply tank was lowered to dH and the J PH value was 6.3. On the other hand, in Example 1, 22 hours after the start of the saline spray test, the test salt in the saline replenishment tank> the mixture solution still had a pΗ value of 6 · 8. From the measurement results of Shiyou / Comparative Example and Example 1, it is obtained that the pH value of the salt solution for testing in the salt water replenishment tank is less likely to decrease in Comparative Example of Example 1. In the conventional salt water spray test device, r for the test in the rehydration supply tank :: full surface above the liquid 'often contacts the air in the salt water supply tank. Therefore, the oxygen in the air in the brine supply tank will be dissolved in the test ΓΓ. Carbon is one of the acidic substances that acidify water. Other substances: Sulfur dioxide is also an acidic substance. Then, the test salt solution 々L was output to the test salt solution storage Ziyue Shuibu ... "Inflow air from the outside, so that the water supply tank becomes often the same as the external air pressure. Therefore, the inventor cage; 、,, PH value of the cup 6.5 Heart 312682 (Please read the precautions on the back before filling this page) IT --------- · 534985 Printed by the Employees' Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 7 A7 B7 V. Description of the invention (7) A salt solution is used to float a floating plate on one side of the salt solution, and the other is left without a floating plate and left to stand for 6 or 7 hours, and then an experiment is performed to measure the pH value of the salt solution for testing. As a result, the pH value of the one on which the floating plate was floated did not decrease. On the contrary, the pH of the one on which the floating plate was not floated decreased. In Example 1 of the present invention, the test salt solution in the salt water replenishing tank floated upward. A floating plate is provided, so the contact area with the air becomes smaller. Therefore, acidic substances mainly containing carbon dioxide in the air in the salt water replenishing tank will not easily dissolve in the test salt solution. In Example 1, the size of the floating plate Covers salt water The test solution in the supply tank is above the salt solution. In addition, along the wall of the salt supply tank, the side of the floating plate and the upper end of the salt supply tank can be connected by a retractable or foldable sheet to block the air. The pH characteristics of the salt solution in the tank, the spray liquid collection container and the spray liquid collection container. The pH value of the salt solution in the spray liquid collection container is measured only after the test is completed. This figure is a comparative example and an example The pH value of the salt solution at each measurement site after the test of 1. The curve of the comparative example is the pH value 14 hours after the start of the test and the curve of Example 1 is the pH value 22 hours after the start of the test. If the pH value of the salt solution drops between the measurement of the spray solution and the measurement of the spray container, the drop between the measurement of the spray solution in the container and the measurement of the spray container will decrease more significantly. In Example 1, the pH value of the salt solution is almost between the measurement in the salt water supply tank and the measurement in the spray liquid container. Therefore, the measurement in the spray liquid container and the spray liquid use The measurement of the graduated cylinder does not decrease. According to Example 1, the paper size adopted during spraying is the Chinese National Standard (CNS) A4 specification (21G X 297 public love) 312682, · r ------ ------------- ^ --------- (Please read the notes on the back before filling this page) 534985 A7

The spray liquid becomes within the range of pH 6 · 5 to 7.2. In the conventional brine spray test device, the brine is sprayed from the brine supply tank through the test salt solution storage tank provided outside the test tank, and the salt solution is poured into the test salt solution storage tank under the spray tower. The piping material connected from the feed tank to the test solution storage tank was soft gas ethylene. Therefore, in the conventional salt water spray test device, the salt solution for the test solution in the water tank of the radon gas [carbon-based acidic substances will be dissolved in the test salt solution. However, the test salt solution flows out to The portion of the salt solution storage tank for the test flows into the air from the outside, so that the water level adjustment tank of the salt solution storage tank for the test becomes always the same as the external air pressure. In addition, since the water level adjustment tank for the test salt solution storage tank is arranged outside the test tank, the water temperature in the water level adjustment tank is lower than the temperature in the test tank maintained at the test temperature of 35 ± 2 ° c during the test. The gas is easily dissolved in the salt solution. Then, the acidic eluate was eluted from the piping to the test salt solution. In Example 1 of the present invention, the test salt solution flows from the brine supply tank into a test salt solution storage tank provided with a float-type on-off valve in a spray tower, and is sprayed. Therefore, there is no water level adjustment tank for the test salt solution storage tank that causes the infiltration of acidic substances starting with carbon dioxide. The salt solution storage tank for the test was heated to the test temperature of 35 ± 2 ° C by the steam sent from the steam generator to the test tank. Table 1 is published on the Japanese chronology of science (1996, Vol. 69, issued by Maruzen Co., Ltd.) on page 54 and shows the volume (cm3) of 1 atm of carbon dioxide dissolved in 1cm3 of water at each temperature converted to 0 ° Volume value at C 1 atm. It is known from Table 1 that the higher the temperature, the less the carbon dioxide dissolves into water. This paper size applies Chinese National Standard (CNS) A4 specification (210 X 297 public love) 312682 C (Please read the precautions on the back before filling out this page) -II I-" " Order ----- I I -Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs of the Ministry of Economic Affairs 8 534985 A7 B7 V. Description of the invention (9 [Table 1] Temperature

0 ° C

20 ° C

40 ° C

60 ° C Carbon oxide (cm3) 1.71 0.88 0.53 0.36 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs in Example 1 of the present invention, the temperature of the water in the storage tank for the salt solution used in the test is usually higher than that outside the test tank Therefore, the carbon dioxide starting from the salt solution storage tank of the relevant test is used to dissolve the salt solution into the water level adjustment tank of the test salt solution storage tank of the conventional salt spray test device, and the relevant gas is dissolved in the test. The salt solution is less soluble. In Example 1 of the present invention, the salt water supply tank and the test salt solution storage tank are directly connected, and the length of the piping is set to be shorter than a conventional device of the same size. In the known salt water spray test device, between the salt water supply tank and the test salt solution storage tank, the water level adjustment tank is separated by the test salt solution storage tank, such as the distance from the wall of the conventional test tank to the spray tower. In a test device of about 42 cm, the length of the piping between the salt water supply tank and the test salt solution storage tank was about 72 cm. In Example 1 of the present invention, even when a test tank of the same size as the conventional device is used, the length of the pipe between the saline supply tank and the test salt solution storage tank is about 45 cm. Therefore, in the present invention, it is possible to reduce the chance of the test salt solution being acidified by the acidic leachate from the piping. It also reduces the chance of contact between the salt solution used in the test and air. Furthermore, in the present invention, the piping connecting the spray liquid collecting container and the spray liquid collecting cylinder, and the piping connecting the salt water supply tank and the test salt solution storage tank are made of a material that does not easily dissolve ionic substances into the salt solution. to make. The piping that connects the salt water supply tank and the test salt solution storage tank in Example 1. This paper size is applicable to the Chinese National Standard (CNS) A4 specification ⑵G x 297. The public copy 9 312682 (Please read the precautions on the back before filling in this Page) 534985 A7 V. Description of the invention (10 One part is made of hard gas, and the other part is shattered resin tube, and the pipe connecting the spray liquid container and the spray liquid measuring cylinder is a tube of lithone resin. The hard gas ethylene pipe and Shixigang resin pipe have less dissolution of the acidic substance f of the salt solution than the conventional soft gas ethylene pipe. S Therefore, it is possible to prevent the salt solution flowing through the relevant pipe from the above. In the present invention, in order to prevent the acidification of the salt solution caused by the air in the piping connected to the spray container and the spray solution, the piping is filled with the test salt solution in advance. At the beginning of the test, the relevant salt solution for the test was drawn out from the spray solution through a measuring cylinder. Figure 4 is a graph of the positive value characteristics of different salt solutions of materials. It shows: ㈣ gas-gas vinyl sheet, silicone tree The pH value of salt solution of grease tube and soft gas ethylene tube immersed in salt solution for one hour. It is known that the pH value of salt solution of rigid vinyl chloride tube and resin tube of Shixi network decreases less than that of soft gas ethylene tube. Figure 5 shows the pH characteristics of the liquid according to the piping materials connected to the spray liquid container and the spray liquid measuring cylinder. The liquid system uses the liquid spray container and the spray liquid using the measuring cylinder. The resin tube is softer than the vinyl chloride tube, which can prevent the pH value of the salt solution from falling. The results of the corrosion test by the conventional salt spray test device show that the copper plate becomes pink, and the iron plate and the word plate become black. -Aspect 'In the present invention, the acidic corrosion residue is not shown, but it is known by a neutral test. Moreover, the corrosion loss is smaller than that of the comparative example. This can be seen from the fact that acidic corrosion is larger than that of neutral corrosion. _ The picture is applicable to the Chinese National Standard (CNS) A4 specification (2W χ 297) in the neutral and acidic environments at the M. Zhang scales of the foreign psychiatrician respectively. (Please read the note on the back first (Fill in this page again) -------- Order --------- · Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 10 534985 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 V. Invention Description (11 years later) Photographs of the vinyl chloride-coated steel slabs were soil slabs and unexposed gas-ethylene-coated steel plates. Exposure tests were performed on the steel plate Jl ^ and the nicks on the grain were exposed. In the photos after the exposure, the black part was injured M A ^ 77 And rusty parts. However, in the photos after the road was broken in a neutral environment, there were traces of the peeling coating of Yinyouqian, a few black lines in the right Toyotomi department. The percentage of rusty area in the “%” environment is high, and it can be known that the remaining corrosion is in progress. [Effects of the Invention] As described above, the Linzanyue salt water spray test device of the present invention is provided with a means to prevent acidic substances from being dissolved in the solution

Find a night mechanism, so you can keep the test solution in the pH range of 6.5 to 7.2. Therefore, it is necessary to keep the spray liquid taken during spraying in the range of pH 6.5 to 7.2. Therefore, the credibility. _ "Salt water spray test" The salt water spray test device of the present invention is like a new solution tank, so the production cost is low. And == the PH value at the time of addition and the yang value of the spray solution used: almost: = capacity The test solution is not required for the preparation of the liquid solution, and it is easy to carry out a test of good reliability for the test. 4 The tester can all [the simple description of the drawing] Figure 1 shows the application of the present invention. Partially cut-away front view of the salt water spray test equipment. Figure 2 is the characteristic map of the test job in the salt water supply tank. The aging of pH value Figure 3 is the dosage of the salt water supply tank and spray liquid PH characteristics of the salt solution in the tube. ° and spray liquid ear picking (CNS— ^ (210 X 297) 312682 (Please read the precautions on the back before filling this page) ▼ 装 -------- —Order ---------

II 534985 A7

V. Description of the invention (Figure 4 of the U figure shows the pH value of the salt solution based on the difference in materials. Figure 5 shows the difference in the piping materials of the connection 喑 ^^, the mist liquid taker, and the spray liquid take tube. Indicating # $ > ^ ^ tL Lishuang does not take the liquid pH value characteristic chart. Figure 6 is exposed in a neutral environment, _ brother acid %% individually outside the house] gas-covered steel sheet after a year and the difference ^ ^ μ Photo of gas-coated steel sheet exposed by Jiuhe [Description of element symbols] I Steam generator 3 Pipe for spray liquid 5 Salt solution storage tank for testing 7 Air saturator 9 Spray tower II Test piece 13 Saline supply tank 15 Spray liquid used measuring cylinder 2 4 6 8 10 12 14 16 Piping for steam inlet port measuring tube Float switch valve spray nozzle test tank salt water spray test Split nozzle spray liquid container floating plate (Please read the precautions on the back before Fill out this page} Order --------- Printed by the Consumer Property Cooperative of Intellectual Property Bureau of the Ministry of Economic Affairs of China The paper size is applicable to China National Standard (CNS) A4 (210x 297 mm) 12 312682

Claims (1)

534985 Patent application scope 2 .: A salt water spray test device, which is neutral ...; neutral salt spray test with pH 7 as the center of the test solution: scum: to keep the test solution at the pH value when the production is completed, Set the test salt solution in the 7 supply tank and the salt, salt, salt, salt, and salt. In addition, Yu Youban, in order to cover the wire, contact the air, and use a pipe to send the salt solution directly to the spray. : 'Those who prevent the acidic substance from dissolving in the salt solution and cause the pH value of the salt solution to change. : A kind of salt spray test device, which is a neutral salt spray test device with a temporal salt solution as the corrosion 2 solution and a pH 7 as the center. The salt solution is replenished to maintain the test solution at the pH value when the production is completed. The tank is provided with a floating plate, and the test solitary / combined liquid from the brine supply tank is stored in a spray tower, and a floating ball valve is provided in the spray tower as a test salt solution storage tank, instead of being used in The test tank is equipped with a water level adjustment tank for the salt solution storage tank for the test, so as to shield the contact between the salt solution and the air to prevent the acidic substance from dissolving in the salt solution and causing the pH value of the salt solution to change. ^ -------- ^ --------- (Please read the notes on the back before filling out this page) The paper size printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs applies this national paper standard ( CNS) A4 size (210 X 297 mm) 13 312682