Third party salt fog test report
Tianjin Rong Da Testing Co., Ltd. contact: Wang Jingfu
Cell phone: 13102238283 QQ:3144667033
Telephone: 022-23892103
1 salt spray test:
Salt spray corrosion is one of the most common and destructive atmospheric corrosion.
Salt spray test is a kind of environmental test, which is mainly used to test the corrosion resistance of products or metal materials by artificial simulation of salt spray environment created by salt spray test equipment.
Salt spray test is divided into two categories: 1 natural environmental exposure test, 2 artificial accelerated simulation of salt spray environment test.
Artificial simulation of salt spray test is the use of a test equipment has a certain volume space of the salt fog test box ", the artificial method used in the volume of space, resulting in the salt spray environment to carry out the assessment of product quality of salt spray corrosion resistance. Compared with the natural environment, the salt concentration of chloride salt fog environment, can be several times the general natural environment of salt fog content or a few times, the corrosion speed is greatly improved by salt spray test on the product, the results of the time is greatly shortened.
2 artificial simulation of salt spray test:
(1) neutral salt spray test (NSS test)
Is one of the most widely used accelerated corrosion test methods. It uses 5% sodium chloride solution, the solution pH value is adjusted in the neutral range (7 ~ 6) as a spray solution. The test temperature is 35 degrees Celsius, and the precipitation rate of salt mist is between 1 and 2ml/80cm2.h.
(2) (Cu Suan) acid salt spray test (ASS test)
Is based on the neutral salt spray test. It is in the 5% Sodium Chloride Solution to add some ice acetic acid, so that the pH value of the solution is reduced to about 3, the solution becomes acidic, and finally the formation of salt mist from the neutral salt mist into acid. Its corrosion rate is about 3 times faster than the NSS test.
(3) copper accelerated acetic acid salt spray test (CASS test)
Is a kind of rapid salt fog corrosion test abroad newly developed test, the temperature is 50 DEG C, adding a small amount of copper salt and copper salt solution, strongly induced corrosion. Its corrosion rate is about 8 times as much as that of the NSS test.
(4) alternating salt spray test
Is a comprehensive salt spray test, it is actually neutral salt spray test and constant damp heat test. It is mainly used for the cavity type of the whole product, through the infiltration of the tidal environment, so that the salt spray corrosion not only in the product surface, but also inside the product. It is the product of the two kinds of environmental conditions in salt fog and heat alternating conversion, the final assessment of the electrical performance and mechanical properties of the machine has no change.
3, salt spray test standards:
9227-2012 ISO; 2423.17-2008 GB/T (Kb); 2423.17-2008 GB/T (Ka); 10125-2012 GB/T
4, salt spray test results analysis:
Key points:
In the analysis should pay particular attention to distinguish between white, white rust and salt flow, the two can not be included in the percentage. Distinguish between salt flow and white rust method: if you can wash, it is not white rust, because the white rust is the corrosion of the shell material itself, generally do not go out, wash off mostly salt flow.
Face：
We are the salt spray test judgment refers to all the work surface, such as screw thread, cross slot; large part shaped piece, but does not include the side, because the process of relationship between zinc plating, coating thickness of the plating to the small side face to face than small, rust quickly. So before the experiment, the subjects were clear where is the working face, and noted in the report