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Common surface treatments for lifting chains

2025-09-08

rizhi

Common surface treatments for lifting chains include the following: 1. Blackening treatment (Bluing treatment) This is a very common and economical method of surface treatment. · Process principle: A dense layer of iron oxide (Fe₃O₄) film is formed on the surface of the chain through chemical methods (alkaline blackening or acidic blackening). The thickness of this film is very thin, only 0.6-1.5 micrometers. · Appearance: It presents a dark black or bluish-black glossy surface. · Advantages: · Low cost, simple process. · After treatment, it almost does not change the dimensional accuracy of the chain (because the film layer is thin). · Beautiful appearance.