Extrusion & Post
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Pinhole defects in the coating layer
Problem Phenomenon
Dense pinholes appear in the powder coating, causing corrosion protection failure
Cause Analysis
The raw material contains water, the solvent volatilizes quickly, the substrate is contaminated, and the curing is too fast
Solution
Pre-dry the powder at 80-100C for 2h, substrate Sa2.5, stepwise temperature rise
Key Takeaway
Pinholes are the starting point of corrosion protection failure
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