Salt spray test chamber use and test method comparison

The purpose of the salt spray test box is to detect the salt spray corrosion resistance of the product or metal material, and the salt spray test results identify the quality of the product. Necessary conditions for fog corrosion. There are four methods for detecting the results of the salt spray test chamber: 1. Rating judgment method; 2. Weighing judgment method; 3. Corrosion appearance judgment method; 4. Corrosion data statistical analysis method. The rating judgment method divides the percentage of the corrosion area and the total area into corresponding grades according to a specific method, and one of the grades is used as the basis for judgment. It is suitable for evaluating flat samples; the weighing judgment method is to pass the corrosion test The method of weighing the quality before and after, comparing the weight before and after the product test to identify the corrosion resistance of the product. It is very suitable for the corrosion resistance test of a certain metal; the method of judging the appearance of corrosives is a qualitative judgment method. It is to judge the product after observing whether the product is corroded after the salt spray corrosion test. Many products This method is generally used; the statistical analysis method of corrosion data provides a method for designing corrosion tests, analyzing corrosion data, and determining the credibility of corrosion data. It is mainly used for analyzing and statistically corroding the corrosion situation, not specifically for a certain Determine the quality of specific products.

The salt spray test chamber mainly uses equipment to create an artificial simulated salt spray environment to test the environmental resistance of the test products. It can be divided into two categories, namely natural environment exposure test and artificial accelerated simulated salt spray environment test. The artificial accelerated simulated salt spray environment test is to use the equipment with a certain space volume-the salt spray test box, and use the artificial method to create a salt spray environment in its volume to judge the salt spray corrosion resistance of the product. Compared with the natural environment, the sodium chloride salt concentration is several times or even tens of times that of the general natural environment salt spray, which greatly accelerates the corrosion rate of the test product, and the detection time of the result of the salt spray corrosion resistance of the test product is also Shortened. If the product is subjected to a corrosion resistance test in a naturally exposed environment, it may take one year to wait for its corrosion. In the case of artificial salt spray test, it takes only 24 hours to obtain similar results. The artificial simulated salt spray test also includes the neutral salt spray test, the acetate salt spray test, the copper salt accelerated acetate salt spray test, and the alternating salt spray test.

Salt spray test chamber use and test method comparison

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