The difference of the solution test of the salt spray test chamber

The most conventional test methods of the salt spray test chamber are the neutral salt spray test and the acid salt spray test. There are certain differences in the test solution:

 A. The test solution of the neutral salt spray test (NSS test): at 23±2℃ Under the conditions, the pH value of the sodium chloride solution needs to be adjusted to 6.5-7.2. Both acid and alkali can be used to adjust the pH value of the solution. The pH value needs to be at 23±2℃, using glass electrodes, and electrolysis Method determination. The concentration of the test solution is 50±5 per liter.

B. Test solution for acetic acid salt spray test (ASS test): The pH value of the sodium chloride solution needs to be prepared with an acetic acid solution to ensure compliance with the standard, and all sprayed and collected solutions have a pH value of 3.1 to 3.3. The temperature is 23±2℃, and 1 to 3 grams of acetic acid per liter is required. The pH value needs to be measured at 23±2℃ with a glass electrode and electrolytic method. The concentration of the test solution is 50±5 per liter.

C. Test solution for copper accelerated acetic acid salt spray test (CASS test): First, add 0.26±0.2g of copper chloride 2 water per liter, and other requirements shall be formulated and implemented in accordance with the standards.