In fact, it can be said that the salt spray test chamber is designed to evaluate the quality of the decorative Cu + Ni + Cr or Ni + Cr coating, and is also suitable for the anodized aluminum layer. The salt spray test chamber is unreliable for comparing Cu + Ni + Cr or Ni + Cr coatings, because the acceleration of copper corrosion products of Cu + Ni + Cr coating is masked by the effect of copper ions present in the test solution.
The preparation of copper accelerated acetate salt spray test solution is to dissolve sodium chloride in distilled water or deionized water so that the concentration is 50 ± 5g / L. Sodium chloride must be white and dissolved in water to obtain a colorless solution. In principle, sodium chloride cannot contain copper and nickel, and the amount of sodium iodide should be less than 0.1%, and the total impurities calculated based on dry salt should not exceed 0.4%. If the pH of the configured solution is outside the range of 6.0 to 7.0, check for harmful impurities in both salt and water.
A sufficient amount of copper dichloride (CuCI2 · 2H20) needs to be added to the salt solution to make its concentration 0.26 ± 0.02g / L (equal to (0.205 ± 0.05g / L CuCI2 · 2H20)
A sufficient amount of glacial acetic acid needs to be added to the salt solution to ensure that the pH of the salt spray solution sample collected in the salt spray test chamber is between 3.1 and 3.3. If the pH of the initially prepared solution is 3.0 to 3.1, the pH of the spray solution will probably be in this range. All pH values ​​should be measured with an electric meter at 25 ° C. However, the precision pH test paper that can read 0.3pH increase and decrease, and check the fruit by electrical measurement control can be used for daily inspection. Analytical grade glacial acetic acid or sodium hydroxide can be added for any necessary adjustments.
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