The water used in the salt spray test solution must be distilled or completely deionized water. At a temperature of (23 ± 2)°C, the conductivity of the water should not exceed 2 mS/m. The sodium chloride used for preparing the test solution must have a maximum impurity content of 0.3%, with sodium iodide not exceeding 0.1%, and the combined amount of copper and nickel must be less than 0.001%. Below are detailed instructions for preparing the salt solutions used in three common salt spray test methods.
For neutral salt spray solution preparation: Dissolve chemically pure sodium chloride, as specified by GB1266, in third-grade water, as defined by GB6682, to achieve a concentration of (50 ± 10) g/L. Measure the pH of the solution at 65°C using pH paper, aiming for a range of 6.5 to 7.5. If the pH is out of this range, adjust it using analytical-grade hydrochloric acid or sodium hydroxide. Before use, the solution must be filtered to remove any undissolved particles.
For the acetate spray solution: Begin by dissolving chemically pure sodium chloride, following GB1266, in third-grade water (GB6682) to reach a concentration of (50 ± 10) g/L. Then, adjust the pH of the solution using acetic acid to bring it within the range of 3.1 to 3.3. This pH measurement should be done using collected salt spray samples, and the reading should be taken at 25°C. As with the previous solution, the final mixture must be filtered before use.
For the copper-accelerated acetic acid/salt mist solution: First, prepare a sodium chloride solution by dissolving chemically pure sodium chloride, according to GB1266, in third-grade water (GB6682), achieving a concentration of (50 ± 10) g/L. In the second step, add reagent-grade copper chloride (CuCl₂·2H₂O) to 3.8 liters of the brine solution, ensuring complete dissolution and thorough mixing. Finally, adjust the pH of the solution using acetic acid to maintain a range of 3.1 to 3.3. Again, the pH should be measured using collected salt spray samples at 25°C. Before application, the prepared solution must be filtered to ensure clarity and consistency.
These precise procedures are essential for maintaining accurate and repeatable results during salt spray testing, which is commonly used to evaluate the corrosion resistance of materials and coatings. Following these guidelines ensures that the test conditions remain consistent, providing reliable data for quality control and material evaluation purposes.
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