The water used in the salt spray test solution must be distilled or completely deionized water. At a temperature of (23 ± 2)°C, the water's conductivity 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 different salt spray testing methods:
**Neutral Salt Spray Solution Preparation:**
Dissolve chemically pure sodium chloride, as specified by GB1266, in third-grade water according to GB6682. The concentration should be (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 outside this range, adjust it using analytical hydrochloric acid or sodium hydroxide solution. Before use, the solution must be filtered to remove any impurities.
**Acetate Spray Solution Preparation:**
First, dissolve chemically pure sodium chloride (as per GB1266) in third-grade water (per GB6682) at a concentration of (50 ± 10) g/L. Then, adjust the pH of the solution using acetic acid to reach a range of 3.1 to 3.3. The pH should be measured using collected salt spray samples at 25°C. As with the neutral solution, the prepared solution must be filtered before use.
**Copper-Accelerated Acetic Acid/Salt Mist Solution Preparation:**
Start by dissolving chemically pure sodium chloride (GB1266) in third-grade water (GB6682) at a concentration of (50 ± 10) g/L. Next, add reagent-grade copper chloride (CuCl₂·2H₂O) to 3.8 liters of the brine solution and mix thoroughly. Finally, adjust the pH of the mixture to 3.1–3.3 using acetic acid, measuring the pH with collected salt spray samples at 25°C. Always filter the solution before applying it in the test.
Proper preparation of the salt solution is crucial for accurate and consistent results in salt spray testing. Following these guidelines ensures that the test conditions meet industry standards and produce reliable outcomes.
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