Phosphate coatings appear light gray to black depending on the process used.
Phosphate is a excellent base for paint, and when combined with a class 2 oil coating, it has good corrosion resistance.
|Type Z||Zinc Phosphate base.|
|Class 1||Supplementary preservative treatment or coating, as specified.|
|Class 2||Supplementary treatment with lubricating oil conforming to MIL-L-3150.|
|Class 3||No supplementary treatment.|
|Class 4||Chemically converted (may be dyed to color as specified). With no supplementary coating, or supplementary coating
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