The salt spray test chamber has many titles in the industry. After careful summary,
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Neutral salt spray test method
The neutral salt spray test is a method of accelerated corrosion test, which is carried out in a special salt spray box. It is mainly used for the corrosion resistance of galvanized, cadmium, oxidized and phosphating coatings on steel parts test.
The brine prepared by the neutral salt spray test is a 5% sodium chloride solution with a pH of 6.5 to 7.2, a temperature in the box of about 35 degrees, and a relative humidity of over 95%.
Neutral salt spray test spray settlement is 1 ml ~ 2Ml / 80cm² · h, the concentration of the collected salt spray sodium chloride should be about 5%, PH is 6.5 ~ 7.2, nozzle pressure should be 0.07MPa ~ 0.1 Mpa.
Operation method of neutral salt spray test:
First, use organic solvents to clean the surface of the sample, so that the sample is free of oil stains
Second, place the test product in a salt spray box, with the test surface of the test product facing upward and between 15 degrees and 30 degrees from the vertical line.
3. Periodically conduct salt spray test on the product.
4. After removing the product for cleaning, dry it at 80 to 100 degrees Celsius for 30 minutes.
Fifth, evaluate the corrosion resistance of the product.
Acetic acid salt spray test method
It is mainly used for the salt spray corrosion resistance test of copper-nickel-chromium or nickel-chromium decorative coatings. The resistance test uses an acetate salt spray solution prepared by chemically pure glacial acetic acid, with a pH of 3.0 to 3.1, and a spray collection solution PH value It is 3.2 ± 0.1. The other requirements of the test are the same as the neutral salt spray test method.
Copper salt accelerated acetate fog test method
It is mainly used for the corrosion resistance test of copper-nickel-chromium or nickel-chromium decorative coatings on steel parts and zinc die castings.It is also suitable for the corrosion resistance test of aluminum and aluminum alloy anodized films.
The preparation method of the salt solution for the test is as follows: the NaCl solution is prepared according to the neutral salt spray test method. 0.26 ± 0.02g / L of chemically pure copper chloride (CuCl2 · 2H2O) is added to the NaCl solution. The pH is adjusted with chemically pure glacial acetic acid It is 3.0 to 3.1.
The test temperature is about 50 degrees Celsius, the pH of the spray collection liquid is 3.2 ± 0.1, and other requirements are similar to the neutral salt spray test.
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