Why does surface finishing improve the deep-drawing performance of galvanized sheets?
Surface finishing lowers the material's lower yield point, eliminating the yield plateau and preventing slip lines during stretching or deep drawing. Simultaneously, the surface roughness allows for grease retention, reducing die wear and improving processing efficiency.
How to repair damaged galvanized pipe coatings?
Upon discovery of damage, promptly apply zinc-rich paint to the damaged area to isolate it from corrosive media and prevent rust from spreading from the damaged area.
What problems arise from excessive chloride ion content in the plating bath?
Excessive chloride ion content can lead to coating defects and cause particle adsorption on the workpiece after plating. The chloride ion concentration can be reduced by electrolyzing the plating bath to ensure coating quality.
Why do some galvanized products require sealing treatment?
Sealing treatment forms a protective film on the passivation film surface, further improving the coating's corrosion resistance, preventing passivation film aging, and extending the product's service life in humid and harsh environments.
How can the environmental problems of traditional galvanizing processes be mitigated? Chromium-free passivation technology can be used to replace the passivation process containing hexavalent chromium; energy-saving renovations can be carried out on zinc pots to reduce energy consumption; and a waste zinc recycling system can be established to centrally treat production wastewater and waste residue before discharge.