Neutral and Cu-accelerated Acetate Fog Solution Preparation Salt spray test chamber It can do four kinds of salt spray test: neutral salt spray test, copper salt accelerated acetate spray test, acetate spray test, and alternating salt spray test. The salt solutions formulated for each salt spray test are different. The following focuses on the neutral salt spray test and the copper accelerating acetate spray test solution preparation method with attention.
A neutral salt spray test (NSS test)
1. The salt solution is formulated with nacl (chemically pure, analytically pure) and distilled or deionized water at a concentration of (5% ± 0.1) (mass percentage). The atomized collection liquid shall not be reused except for the baffle-returned part;
2. The pH of the salt solution before atomization is between 6.5 and 7.2 (35±2°C). When preparing the salt solution, chemically pure dilute hydrochloric acid or sodium hydroxide solution can be used to adjust the pH, but the concentration must still meet the requirements of point a.
II. Accelerated Acetate Salt Fog Test (CASS Test)
1. Dissolve nacl in distilled or deionized water at a concentration of 5%, ie 50 ± 5 g/L.
2. Copper chloride (CuC12-2H2O) was added to the neutral salt spray test solution at a concentration of 0.26±0.02 g/L (ie, 0.205±0.015 g/L anhydrous copper chloride).
3. Add an appropriate amount of glacial acetic acid to the solution to ensure that the pH of the salt spray collection solution in the test chamber is 3.1-3.3. For example, if the pH of the solution before spraying is 3.0-3.1, the pH of the collected solution is generally in the range of 3.1-3.3. The pH of the solution can be measured with an acidometer. Precision pH test paper calibrated with a pH meter and capable of reading 0.1 pH changes can also be used as a routine test. The pH of the solution can be adjusted with glacial acetic acid or sodium hydroxide.
4. To avoid clogging of the nozzle, the solution must be filtered before use.
Neutral salt spray test is the most widely used. Customers must formulate the solution in accordance with the proportion of the instructions, so that the test data obtained will be more accurate.
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