The salt spray test box can artificially simulate the salt spray test, including the neutral salt spray test, the acetate salt spray test, the copper salt accelerated acetate salt spray test, the alternating salt spray test. Test solution ratio index: 1. Copper salt accelerated acetate spray test: a. Put chemically pure sodium chloride solution in tertiary water with a concentration of (50 ± 10) g / L. b. Add reagent grade copper dichloride (CuCl221120) to 3.8 liters of brine to dissolve and mix thoroughly c. Adjust the PH value of the solution with acetic acid so that the PH value is in the range of 3.1 ~ 3.3. The PH value is measured with the salt spray sample collected. PH value measurement should be carried out at 25 ℃, the prepared solution must be filtered before use. 2. Acetate salt spray test: first dissolve chemically pure sodium chloride in tertiary water at a concentration of (50 ± 10) g / L and then adjust the PH value of the solution with acetic acid so that its PH value is 3.1 to 3.3 Within the range, the PH value was measured with the salt spray samples collected. 3. Neutral salt spray test: Dissolve chemically pure sodium chloride in tertiary water, the ratio of brine is 1:19, that is, one pound of industrial salt is equipped with 19 pounds of purified water, and the cleanliness of the purified water reaches the standard used. can. The concentration is (50 ± 10) g / L. The pH value of the test solution was measured at 6.5 ~ 7.5 with PH test paper at 25 ° C. Custom Tent,Display Tent,Portable Tent,Custom Printed Canopy HESHAN YUEHAN UMBRELLA MANUFACTURING CO., LTD , https://www.sunplustent.com