After the salt spray corrosion test of the metal plating layer, the electroplated layer positive for the substrate, such as galvanizing, its surface appearance changes include discoloration, loss of gloss, corrosion of the cover layer and corrosion of the base metal. Divide the various changes it produces into 9 levels including A ~ I. The changes in appearance at each level are shown in the table below. The rating of the coating can be evaluated by referring to the phenomena listed in the table.
Appearance Rating Changes in the appearance of the sample surface
No change in class A
Grade B slight to moderate discoloration
Grade C severe discoloration or very slight loss of light
Class D slight loss of light or very slight corrosion products
Grade E severe loss of gloss, or a thin layer of corrosion products or pitting on the surface of the sample
Class F has corrosion products or pitting corrosion, and one of them is distributed on the entire sample surface
The entire surface of class G is covered with thick corrosion products or pitting corrosion, and there are deep pitting corrosion
The entire surface of class H has very thick corrosion products and pitting corrosion and deep pitting corrosion
Class I corrosion of the base metal
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