Salt Spray Testing in the

The gradual degradation of metals by a chemical reaction is called Corrosion. In other words, a corrosive reaction would occur when a metal is exposed to an oxidant (oxygen) creating an electrochemical oxidation. Rusting of iron is one of the most common examples of corrosion that the general population is aware of. Since corrosion is common and can happen to most metals used commercially, theories and ways to protect metals from corrosion were developed. Applied coatings (paints, etc.) and reactive coatings (zinc, etc.) are some of the typical coatings used for the protection of metals from corrosion. Once the methods of protection from corrosion were developed, there was a need to test these processes to scale them on the benchmarks of time, cost effectiveness and overall performance. Salt spray testing was identified and accepted as the standardized corrosion test methodology. The salt spray test helps determine the resistance of the metal and coatings against corrosion. With this test, a corrosive medium is produced to evaluate the coating used as the defensive finish for the metal. The salt spray test is cost effective, standardised and repeatable which makes it extremely popular in industry. It works on the principle of creating a corrosive environment and then observing and recording the time taken for corrosion products to appear on the test samples. Additionally, the comparison of actual test results v/s expected corrosion resistance of metals can be made. Thus, the salt spray test is quite often used for quality audit purposes in production processes for firms which deal in metallic products. tuzDLsTw
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