Electroplating
Plating is the electrolytic deposition of a metal layer – such as zinc, chromium, or nickel – on a base material to protect against corrosion or wear.
Physical-Chemical Mechanism of Action
During plating, the workpiece is immersed in an electrolyte bath and connected as the cathode. Metal ions from the solution deposit as a thin, uniform layer on the surface. This creates coatings of zinc, chromium, nickel, copper, or tin.
Metallurgical Relevance & Welding Risks
Plated layers evaporate or burn during welding and can cause porosity, spatter, and hazardous fumes. Chromium layers can release chromium(VI) compounds when heated. The coating must be removed at the weld area and reapplied afterward.
Workshop Practice & Action Guidelines
Grind coated surfaces on both sides of the joint before welding, work with extraction, and rebuild the corrosion protection after welding.