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Common faults and corrective methods of galvanizing

August 17, 2023

Symptoms

Possible cause

Corrective method

Rough coating, dark melting
mixed liquid corrosion

Current density too high

PH too high

Insufficient buffer

Insufficient brightener

Reduce current density

Lower the PH

Add buffer by analysis

Increase brightener

Slow deposition rate

Low in zinc

Low PH

Insufficient conductive salt

Low current density

Add zinc anode

Raise the PH

Add conductive salt

Increase current density

Plating has gray spots, low battery
stream area more

Low current density

Insufficient brightener

PH too high

Too many metal impurities

Increase current density

Add brightener

Lower the PH

Treatment with zinc powder or low current density electrolysis

Plating easy to burn, current
can't increase the density

Low zinc concentration

PH too high

Less conductive salt

Insufficient brightener

Analysis supplement

Lower the PH

Analysis supplement

Add brightener

After drying, the surface of the part has "
hoarfrost"

Dirty to clean after plating

Enhanced post-plating cleaning