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The influence of structure on coating
dgkede
2025-05-19
The influence of surface roughness of white parts on the anti-corrosion performance of coatings
According to relevant information, the coating thickness is generally more than three times the surface roughness value of the product material in order to achieve good corrosion resistance.
For example:
The salt spray corrosion resistance of the 40 µ m thick low-temperature baked water-based chassis paint film can reach over 300 hours on phosphated cold-rolled plates, over 240 hours on hot-rolled plates, and only about 150 hours on cast iron plates.
The salt spray corrosion resistance of 20 µ m thick cathodic electrophoretic paint can reach over 1000 hours on phosphated cold-rolled plates, over 800 hours on acid washed and rust removed hot-rolled plates, and only about 600 hours on shot blasted and rust removed hot-rolled plates.
REPORT