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Iron phosphate coatings
- Thin
amorphous structure;
- Coating weight: 30 to 90
mg./sq.ft
- Excellent surface for paint
adhesion, generally best for severe post forming;
- Good corrosion resistance under
paint.
- Low heating requirements;
- Low equipment expenditures;
- Low chemical costs;
- Easiest to control.
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Zinc phosphate
coatings
.
- Relatively
heavy, definite crystal structure;
- Coating weight: 150 to 600
mg./sq.ft
- Excellent surface for paint
adhesion;
- Maximum corrosion resistance
under paint;
- Good solution life when compared
to iron phosphate.
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