Which products need salt spray corrosion test and methods

The salt spray corrosion test is aimed at the surface treatment of various materials, including hardware plating, hardware, electronic parts, chemical coatings, baking paint, automobiles, motorcycles, hardware sanitary ware, screws, springs, magnetic materials, organic and inorganic coatings, anode treatment, and anti-corrosion Quality inspection in rust oil and other industries to test the corrosion resistance of its products.
  The metal base material is iron or stainless steel, the electroplating layer is zinc/copper/silver/nickel, etc., and the plastic-sprayed metal parts are iron frames.
Metal plating products are mainly screws. I would like to ask you how to do the corrosion resistance test of this product. The salt spray test should be specified for a few hours, and what kind of phenomenon is qualified after completion
experiment method:
1. Use 5 +/- 1% NaCl solution;
2. The temperature is set to 35°C;
3. PH value of 6.5~7.2;
4. The water content of the salt spray is 2 +/- 1ml / 80cm2 / h;
5. The test duration is 48h.
Test judgment standard:
The surface treatment layer should be free of oxidation, substitution, fading, rust, corrosion, etc.