prepainted color coated steel coil ppgi ppgl galvanized steel prepainted steel coil rolls1
3 year ago
The surface defects of galvanized sheet that affect the color coating process mainly include missed plating and zinc flower structure, while other defects include zinc particles, zinc scars, folds, cracks, watermarks, etc.
Missed plating
The area where the galvanized sheet has missed coating will also experience missed coating after coating. Another phenomenon of missed plating is steel leakage, which is caused by thick yellow rust on the hot-dip galvanized substrate for some reason. This oxide skin cannot be fully restored in the reducing furnace, and missed plating can also occur. The missed plating area appears as rough pinhole black spots. Due to the possibility of coating leakage during the color coating process, galvanized sheets used as color coating substrates are not allowed to have coating leakage defects.
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