Preparation and Use of Test Solution for Salt Dry and Wet Compound Salt Spray Box

The preparation and use of the test solution for the dry and wet salt spray box are as follows:

Method A:

1. Preparation of 5% acidic sodium chloride solution (5% neutral sodium chloride solution): Sodium chloride dissolved in distilled water or deionized water with a conductivity not higher than 20us / cm at a temperature of 25 ℃ ± 2 ℃ , Formulated as a solution with a concentration of 50g / L ± 5g / L. At 25 ℃, the density of sodium chloride solution is 1.029-1.036. Sodium chloride contains less than 0.001% (mass fraction) of copper and nickel, copper and nickel The content of is determined by atomic absorption spectroscopy or other analytical methods with the same sensitivity. Sodium chloride should not contain more than 0.1% (mass fraction) of sodium iodide or more than 0.5% of total impurities calculated relative to dry salt, if The PH value of the prepared solution at 25 ℃ ± 2 ℃ exceeds the range of 6.0-7.0, and the content of impurities in brine or water should be tested.

2. Acidification: at 25 ℃ ± 2 ℃, the PH value of the solution should be adjusted to 3.5 ± 0.1, and the following reagents are added to the 10L5% neutral sodium chloride solution: 12mL nitric acid solution, 17.3m sulfuric acid solution, 10% by mass Of sodium hydroxide solution, adjust the PH value of the solution to 3.5 ± 0.1 (about 300mL solution is required)

Method B:

1. Preparation of mixed salt solution: when the temperature is 25 ℃ ± 2 ℃, the sodium chloride dissolved in distilled water or deionized water whose conductivity is really not higher than 20us / cm is prepared for the concentration of 36g / L ± 3.6g / L. The solution is then diluted 1: 6 into a mixed salt solution with a concentration of 6.0g / L ± 0.6g / L. The composition of the standby solution is specified in GB / T19746-2005, Appendix A.3 Test Solution for Simulating Seawater Corrosion Effect The typical synthetic seawater solution is the same.

2. Preparation of acid solution: To prepare an acid solution, 16.2g of concentrated nitric acid is dissolved in water, and then diluted to 1L to make a 1N acid solution, that is, the ratio of nitric acid to sulfuric acid.

3. Preparation of acidified salt solution: add the acid solution prepared above to the mixed solution prepared at a small point, and adjust the PH value to 2.5 ± 0.1 at 25 ℃ ± 2 ℃

Preparation and Use of Test Solution for Salt Dry and Wet Compound Salt Spray Box

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