NEUTRAL  SALT SPRAY TEST                                                    

When we do plating to our customers , they ask a specific hours to pass the salt spray test .Salt Spray Test  is a standardized test method used to check  corrosion resistance of plated components.We should do the plating such a way that component should the pass the particular hours in salt spray test . 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  is evaluated after a period of time. Test duration depends on the corrosion resistance of the coating; the more corrosion resistant the coating is, the longer the period in testing without showing signs of corrosion.

 Salt spray test is done by as per ASTM ( American Society for Testing of Materials) 117  standards.  These standard describe the necessary information to carry out this test , like apparatus, procedure and  testing parameters such as temperature, air pressure of the sprayed solution, preparation of the spraying solution, concentration, pH, etc. This standard is just a reference standard . However, these testing standards neither provide information of testing periods for the coatings to be evaluated, nor the appearance of corrosion products in form of salts. Requirements shall be agreed between  customers and manufacturers.

Salt spray test done for two things, first we do for WHITE RUST and second do for RED RUST .