Salt spray test machine solution preparation scheme
A. Preparation of a neutral salt spray solution for a salt spray tester.
Analytically pure sodium chloride was dissolved in purified water at a concentration of (50 ± 10) g/L. The pH of the test solution was determined to be 6.5 to 7.5 at 25 ° C using a pH test paper. When it is out of range, it can be adjusted by adding analytical hydrochloric acid or sodium hydroxide solution. The prepared solution needs to be filtered before use.
B. Preparation of the salt spray test machine for the acetic acid-salt solution First dissolve the analytically pure sodium chloride in purified water at a concentration of (50 ± 10) g / L, and then adjust the pH of the solution with acetic acid to make it at 3.1 Within the range of ~3.3, the pH was measured using the collected salt spray samples. The pH should be measured at 25 ° C. The prepared solution should be filtered before use.
C. Salt spray test machine copper accelerated acetic acid / salt spray solution preparation * Steps, will be in accordance with the analytical pure sodium chloride solution in accordance with GB6682XX water, the concentration is (50 ± 10) g / L.
In the second step, reagent grade copper chloride was added to 3.8 liters of brine for dissolution and thorough mixing.
The third step is to adjust the pH value of the solution with acetic acid so as to be in the range of 3.1 to 3.2.
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