Neutral salt spray test（NSSExperiment is one of the earliest and currently widely used accelerated corrosion testing methods. It adopts5%Sodium chloride salt solution, solutionPHAdjust the value within the neutral range（6.5～7.2）As a solution for spray. The experimental temperature is taken as35℃Require the settling rate of salt spray to be within1～2ml/80cm·hbetween. this method1914Starting from the year, it has been in use1939Year writtenASTMStandards are still widely used for quality control and are applicable to

lMetal and its alloy materials, metal coatings (anode and cathode), conversion coatings, anodic oxidation coatings, organic coatings on metal materials

lISO 9227Corrosion test in artificial environment-Retained this experimental method

CASS (ASTM B368; ISO 9227) Copper-Accelerated Acetic Acid-Salt Spray

Copper salt accelerated acetic acid salt spray test, a recently developed rapid salt spray corrosion test, with a test temperature of50℃Add a small amount of copper salt to the salt solution—Copper chloride strongly induces corrosion. Its corrosion rate is approximatelyNSSexperimental8Twice.

salt solutionPHValue in3.0-3.1，50±2℃

—copper/nickel/Chromium or nickel/Chromium, steel, zinc alloy, and aluminum alloy surface coatings

—Anodized aluminum

lQuality Control of Inorganic Coating Systems

CASSPreparation of corrosion test solventRequirements and precautions

1、 The preparation of the experimental solution involves dissolving sodium chloride in distilled or deionized water to a concentration of50g/L,Sodium chloride must be white and soluble inwaterObtain a colorless solution. Sodium chloride should not contain copper or nickel in principle, and the amount of sodium iodide should be less than0.1%The total impurities calculated by dry salt shall not exceed0.4%. As for the configured solutionPHIn6.0～7.0Outside the scope, harmful impurities in both salt and water should be checked.

2、 Sufficient amount of copper dichloride needs to be added to the salt solution(CuCl2H2O),Make its concentration.0.26%0.02g/L(equal to0.205%0.05g/L CuCl2H2O).

3、 Sufficient ice vinegar should be added to the salt solution to ensure the concentration of salt spray collected in the test chamberPHIn3.1～3.3between. If the initially prepared solutionPHThe value is3.0～3.1,Then spray solutionPHvalueusuallyWill be within this range. allPHThe value should be in25℃Time measurement. But it can read0.3PHPrecision measurement with increased or decreased quantity and verified by electrical measurement comparisonPHTest strips can be used for daily testing. Analytical grade acetic acid or sodium hydroxide can be added for any necessary adjustments.

4、 In order to remove any substance that blocks the nozzle of spray equipmentFill the reservoir with fluidThe tank must be filtered before use.

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