Common quality problems of galvanized steel coils

1. Defect name: galvanized steel coil – galvanized stripping
Defect performance: dezincification
Cause: Poor furnace temperature, improper handling of the substrate of prepainted galvanized steel coil in stock, etc.

2. Defect name: galvanized steel coil – ungalvanized
Defect performance: the surface of the steel plate is not galvanized
Causes: poor raw materials, poor pre-treatment degreasing, poor furnace temperature

3. Defect name: galvanized steel coil – poor zinc flower
Defect performance: zinc flower size of prepainted galvanized steel coil in stock is uneven, no zinc flower
Cause: poor furnace temperature rise, poor cooling control

4. Defect name: galvanized steel coil – zinc bismuth
Defect performance: spotted on the surface of the coil, attached to the granular zinc residue
Cause: The scum or bottom slag in the zinc pot is attached to the steel strip.

5. Defect name: galvanized steel coil – oxidation
Defect performance: white rust
Cause: During the storage process, it absorbs moisture from the air and oxidizes.

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