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Analysis of the test temperature of salt spray testing machine for checking corrosion resistance
April 18, 2014 source: zhenghang instruments Author: zhenghang network

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The test temperature of salt spray testing machine is as follows:

The results show that there is a certain relationship between the test temperature and the corrosion rate in the salt spray corrosion test. Arrhenius law points out that the chemical reaction rate increases about 2-3 times when the temperature increases by 10 ℃, which means that the corrosion rate of salt spray is accelerated. However, with the further increase of temperature, the concentration of oxygen in the solution decreases, which can not meet the needs of electrochemical reaction. The slow down of electrochemical reaction rate directly leads to the decrease of salt spray corrosion rate. Therefore, it is reasonable to control the temperature in the test chamber at (35 ± 2) ℃.

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Salt spray test chamber is an important method to evaluate the salt spray corrosion resistance of products, including neutral salt spray test chamber, acetate spray test chamber, copper salt accelerated acetate spray test chamber and alternating salt spray test chamber, among which the neutral salt spray test chamber is the most widely used. There are many factors affecting the test results in the salt spray test box. This paper analyzes the pretreatment of the sample, the angle of the sample placement, the pH value of the solution and the test temperature, and discusses the preventive measures. Although the consistency between artificial simulated salt spray test chamber and natural environment exposure can not be determined, as a rapid test method, it has certain representativeness, and there is no better test method to replace it. With the increasing expectation of product reliability, salt spray test chamber will play a more and more important role.

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