The previous section mentioned that the metal plating and chemical treatment layers of products in the light industry need to do the neutral salt spray test and the acetate salt spray test in the corrosion resistance test. The sample requires the entire process. The following continues to explain the copper salt accelerated acetate salt spray test The sample requires the entire process, as follows:
1. The sample shall be a nickel plate with not less than 99% nickel, no more than 0.15% carbon, no more than 0.01% sulfur, no more than 0.4% iron, no more than 0.4% copper, and less than 0.25% copper. The thickness of the plate is about 1 mm. The sample size is 100 * 75 mm. When the sample is used for the first time, the sample should be cleaned with a brush moistened with light magnesium oxide slurry, then rinsed in flowing water to wet the surface, and then at a temperature of 21 ~ 24 ℃ at 1: 4 (volume ratio ) Soaked in hydrochloric acid solution for 2 minutes, rinsed with hot water, dried in an oven at 105 ℃, cooled at room temperature and weighed (sample can be reused). After the test, the corrosion products are removed until a good surface is obtained so that they can be reused in future tests.
Second, the placement of the sample: the weighed sample should be inclined at an angle of 30 ° from the vertical, the surface should face upward, and face the spraying direction of the spray, the bracket should be made of or coated with an inert material, and the upper edge of the sample should be The top of the spray collector is at the same level.
3. Measurement of weightlessness: After 24 hours of testing, the sample is washed with cold water to remove residual salt mist, and then immersed in a 1: 4 (volume ratio) hydrochloric acid solution at a temperature of 21-24 ° C for 2 minutes to remove corrosion products The pliers for taking the sample must be covered with nickel or Monel alloy or the part contacting the sample with inert material, then each sample is rinsed in water, dried in an oven at 105 ° C, cooled to room temperature and weighed. The weight loss of the sample placed on each of the four corners of the box for 24 hours should be 35-70 mg.
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