SALT SPRAY (FOG) CABINETS
Salt spray (fog) cabinets – SASSC
The salt spray test is a standardized test method widely used to check corrosion resistance of coated samples. Coatings provide corrosion resistance to metallic parts made of steel, zamak or brass. Salt spray test is an accelerated corrosion test that produces a corrosive attack to the coated samples in order to predict its suitability in use as a protective finish. The appearance of corrosion products (oxides) is evaluated after a period of time. Test duration depends on corrosion resistance of the coating; the longer is the test period without showing signs of corrosion, the more corrosion resistant the coating will be. Nevertheless, salt spray test is mostly used in the industrial sector for evaluation of corrosion resistance of finished surfaces or parts and in all processes where it is necessary to evaluate the resistance to salt corrosion.
The equipment consists of a closed working room, where a salt solution (mainly, a solution of 5% sodium chloride) is atomized by means of a nozzle. This produces a corrosive salt spray environment, exposing the parts to highly corrosive conditions.
The tests performed with a standardized 5% solution of NaCL are known as NSS (neutral salt spray). Results are represented generally as testing hours in NSS without appearance of corrosion products (e.g. 720 h in NSS according to ISO9227). Other types of tests are Acetic Salt Spray (ASS test) and copper-accelerated acetic acid-salt spray (CASS Test).
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