The purpose of salt spray test is to evaluate the salt spray corrosion resistance quality of products or metal materials, and the judgment of salt spray test results is the judgment of product quality. Whether the judgment result is correct and reasonable is the key to correctly measure the quality of salt spray corrosion resistance of products or metals.
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Matters needing attention in salt spray test:
1. The sample substrate used for testing must be thoroughly cleaned of rust and grease. Whether the substrate is sandblasted, polished or phosphatized, care should be taken not to be exposed to humid air, so as not to form a water film on the surface of the substrate and rust again or reduce the adhesion between the coating and the substrate.
2. The key of salt spray test is to prepare the concentration of electrolyte solution, and the solutes of various components should be weighed strictly in proportion to ensure the accuracy of pH value. Otherwise, it will directly affect the test results.
3. After preparing the painted samples and parts, it is necessary to seal the edges and cover the exposed parts of the substrate with paint, otherwise rust marks will be hung, which will pollute the board surface and bring difficulties to the grading work.
4. When the plates and parts are inspected regularly, the surface of the plates should be kept in a wet state, so as to minimize the exposure time of the plates to the air.
5. Immediately after the test, objectively evaluate the plate, including foaming, discoloration, rust and falling off. We can also increase the inspection and evaluation of adhesion and unilateral corrosion distance of scratches according to customer requirements.
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