Fastener surface plating, hot-dip galvanizing, mechanical plating is the most widely used method of fastener surface forming a coating process, fasteners, after surface treatment, might show a more attractive appearance, corrosion resistance of the fastener itself will also improve. Main aim is to make themselves anti-corrosion of fasteners in order to increase the reliability and adaptability of the fasteners used, so judge the quality of fastener surface treatment, more important is to check fastener corrosion is increased, and whether the increase in line with expectations.
1, fasteners of electroplating
Fasteners of the plating is a fastener needs to be galvanised immersed in a specific solution, aqueous solutions, to contain the deposition of metal compounds, so that electric current through the solution, solution in the metal precipitate and attach on the immersed part of the fastener. Fasteners plating generally include zinc, copper, nickel, chromium, copper and nickel alloys.
2, fasteners of hot-dip galvanizing
Hot-dip galvanizing of fasteners are carbon steel fasteners into the heat of approximately 510 ° c dissolves zinc plated tank so that fastener on the surface of Fe-Zn alloy into the passivation of zinc, resulting in surface treatments. Fasteners of hot-dip galvanized price is higher than that of electroplating, about 1.5 to 2 Yuan per kg.
3, fasteners, mechanical plating
Fasteners for mechanical plating refers to the specific physical and chemical, metal powder coating, impact fastener surface, plating of metals by cold welding, surface coating of fasteners, reach the effect of surface treatment. Fasteners for mechanical plating is mainly used in screws, nuts and washers and other spare parts.