The main function of the salt spray test chamber is to detect the corrosion resistance of the product. The most corrosive of the test methods is the copper accelerated acetate salt spray test.

Compared with the neutral salt spray test, the copper accelerated acetate salt spray test, except for the test temperature is different, the most important thing is the preparation of the solution. The preparation of its solution is divided into three steps:

The first step is to put the sodium chloride solution in distilled or deionized water so that the concentration is 50 ± 5g / L. The sodium chloride must be white and dissolved in water to obtain a colorless solution. In principle, sodium chloride cannot contain copper and nickel, and the content should be less than 0.1%, and the total impurities calculated as dry salt should not exceed 0.4%. If the pH of the prepared solution is outside the range of 6.0 ~ 7.0, check for harmful impurities in both salt and water.

The second step is to add a sufficient amount of copper dichloride (CuCl2 • 2H2O) to the salt solution to make its concentration 0.26 ± 0.02g / L (equal to 0.205 ± 0.05g / L CuCl2 • 2H2O).

The third step is to add enough glacial acetic acid to the salt solution to ensure that the pH of the salt spray solution sample collected in the salt spray test chamber is between 3.1 and 3.3. If the PH value of the initially prepared solution is 3.1 to 3.3, the pH value of the spray solution will most likely be in this range. All PH values ​​should be measured with an electric meter at 25 ° C. However, the precision PH test paper which can read 0.3PH increase and decrease and is verified by electrical measurement control can be used for daily inspection. Analytical grade glacial acetic acid or sodium hydroxide can be added for any necessary adjustments. The prepared solution must be filtered before use.

Extend knowledge: Neutral salt spray test: laboratory: 35 ℃ ± 1 ℃, saturated air barrel: 47 ℃ ± 1 ℃; acid corrosion test: laboratory: 50 ℃ ± 1 ℃, saturated air barrel: 63 ℃ ± 1 ℃ .

Preparation of salt solution in salt spray test chamber with copper accelerated salt spray test

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