Introduction of the three major test standards of salt fog corrosion test
1. Test standard for neutral salt fog test (NSS): In distilled water or ion water, its concentration is 50 plusmn; 5g/L, and then measure the pH value of the solution with acid meter metering. It can also be used as a daily detection with the precision pH test strip of the acidity meter. Or adjust to sodium hydroxide, so that the pH value of the salt and mist collection liquid in the test box is 6.2 ~ 7.2. And in order to avoid the nozzle blocking, the solution must be filtered before use.
2. Test standard for acid salt fog test (ASS): The concentration of chemical pure sodium chloride soluble with distilled water or ionic water is 50 plusmn; 5g/L, and then use acetic acid to adjust the pH value of the solution to the solution In the range of 3.1 ~ 3.3, the pH value should be measured at 25 ° C, and the configured solution should be used after filtering.
Third, copper acceleration of the acetate fog test (CASS) test standard: This test is a fast test developed in foreign countries recently. The test temperature is 50 ° C. In the distilled water or ion water, the concentration is 50 plusmn; 5g/L, and the proportion of 0.26 grams per liter solution to the proportion of copper chloride of the reagent is added to the well -matched salt water, which is fully mixed with acetic acid. The pH value allows it to measure the pH value at a range of 3.1 ~ 3.3 at a range of 25 ° C.