The salt spray test is a test that artificially simulates the salt spray environment. Compared with the exposure test under atmospheric conditions, it has significant advantages: the corrosion environment can be controlled and the environment has good reproducibility; the test time is significantly shortened; Born to save a lot of manpower, financial resources and material resources. Its development and promotion are very fast, and it has developed from the initial simple neutral salt spray test to: acetate salt spray test, copper salt accelerated acetate salt spray test and alternating salt spray test.
The salt spray test chamber provides a controlled corrosion environment, which is used to determine the relevant corrosion resistance data for the metal and coated metal samples exposed in the specific test chamber. When salt spray results are used as independent data, performance predictions in the natural environment are rarely relevant.
In fact, the correlation and extension of the corrosion performance of the exposure in the test environment is not always predictable. Relevance and extension should only exist in the case of further confirmed long-term atmospheric exposure. The reproducibility of the results in the salt spray exposure test depends entirely on the type of sample and the evaluation criteria selected and the control of the operating variables. In any test project, sufficient repetition must be included to determine the variability of the results. When testing similar samples under different test standard methods in the salt spray test chamber, even if the test conditions are nominally similar and within the scope specified in this Code of Practice, variability can be observed.
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