At present, there are anti-wear and anti-rust methods on the surface of workpiece. Besides electroplating hard chromium, what other surface treatment technologies are available, and which are suitable

At present, there are anti-wear and anti-rust methods on the surface of workpiece. Besides electroplating hard chromium, what other surface treatment technologies are available, and which are suitable for local surface treatment? Nickel plating and gun color

Long-acting pearl nickel/pearl nickel brightener/pearl nickel additive/pearl nickel intermediate/lead-free white copper tin/white copper tin additive/tin brightener/bright tin brightener/trivalent white chromium/trivalent chromium electroplating/palladium water/tin cobalt/tin nickel/gun color/acid gun/tin-nickel alloy acid gun/oil removal and wax removal powder. Trivalent passivation solution/acid copper brightener/acid copper additive/acid copper 9 10/ nickel brightener/white bright nickel brightener/black bright nickel brightener/barrel nickel brightener/wax remover/zinc alloy stripper/iron stripper/electrolytic stripper/deplating water/