Common terms used in the salt spray test are as follows:
(1) General surface corrosion
The material is uniformly removed from the contact surface of the entire material, the erosive medium. This is a very common type of salt spray corrosion. Common types are flaky corrosion and planar corrosion.
(2) Pitting corrosion (pitting)
Corrosive media erodes a limited area, which penetrates into the material to form holes or pits, the depth of which is almost always greater than its diameter. In fact no metal is removed from the surface outside the pitting zone. Pitting corrosion is often caused by halide ions.
(3) crevice corrosion
Corrosion occurs mainly at narrow gaps due to concentration differences in corrosive media, such as those caused by long oxygen diffusion channels. This type of corrosion creates a potential difference between the ends of the gap, resulting in increased corrosion in poorly ventilated areas.
Zinc is selectively dissolved from the brass to leave a porous copper structure. The nickel removal and dealumination processes are similar.
Formed ferrous oxide and hydroxide corrosion products on iron and steel.
(6) Loss of light
The gloss of the surface of the object becomes small.
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