1. The natural environment exposure test of the salt spray test chamber.
2.Artificial acceleration simulation salt spray environment test.
Aliases: The artificial simulated salt spray test includes a neutral salt spray test, an acetate spray test, a copper salt accelerated acetate spray test, and an alternating salt spray test.
Method: The artificial simulated salt spray environment test is to use a test equipment with a certain volume space - salt spray test chamber, artificial method in its volume space, resulting in salt spray environment to the salt spray corrosion performance quality of the product. Conduct an assessment.
Compared with the natural environment, the salt concentration of the chloride in the salt spray environment can be several times or several times that of the salt spray content of the general natural environment, so that the corrosion rate is greatly improved, and the product is subjected to a salt spray test to obtain a result.
The time is also greatly shortened. If a product sample is tested in a natural exposure environment, it may take 1 year to corrode, and in a simulated simulated salt spray environment, as long as 24 hours, similar results can be obtained.
Category:
(1) Neutral salt spray test (NSS test) is an accelerated corrosion test method that appears in the current application field of Zui. It uses a 5% aqueous solution of sodium chloride solution, and the pH of the solution is adjusted to a neutral range (6-7) as a solution for spraying. The test temperature is taken at 35 ° C, and the sedimentation rate of the salt spray is required to be between 1 and 2 ml / 80 cm2.h;
(2) The acetate spray test (ASS test) was developed on the basis of a neutral salt spray test. It is to add some glacial acetic acid to the 5% sodium chloride solution, so that the pH value of the solution is reduced to about 3, the solution becomes acidic, and the salt mist formed after the Zui also becomes acidic from the neutral salt spray. Its corrosion rate is about 3 times faster than the NSS test.
(3) Copper salt accelerated acetate spray test (CASS test) is a rapid salt spray corrosion test developed recently in foreign countries. The test temperature is 50 ° C. A small amount of copper salt - copper chloride is added to the salt solution to strongly induce corrosion. . Its corrosion rate is about 8 times that of the NSS test.
(4) The alternating salt spray test is a comprehensive salt spray test, which is actually a neutral salt spray test plus a constant damp heat test. It is mainly used in cavity-type machine products. Through the penetration of the tidal environment, salt spray corrosion is generated not only on the surface of the product but also inside the product. It is to alternate the product under the salt water and hot and humid environment conditions, and finally check whether the electrical and mechanical properties of the whole salt spray test chambers are changed.
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