Several common surface treatments of steel structure bolts

Several common surface treatments of steel structure bolts
Electroplating, hot-dip galvanizing and mechanical equipment plating are widely used on the surface of fasteners. The whole process of producing a soil layer on the surface of fasteners can show a more beautiful and generous surface after surface treatment, and the corrosion resistance of fasteners will gradually improve. The more important goal is to make the fastener itself obtain corrosion resistance, so as to improve the reliability and adaptability of fastener application. Therefore, to distinguish the quality of fastener surface treatment, the more important thing is to check whether the corrosion resistance of fastener is reasonably improved and whether the strength of improvement meets the estimated requirements.
1. Electroplating of fasteners electroplating of fasteners refers to the infiltration of a part of fasteners that must be electroplated into a special solution. The solution will contain some metal material chemicals, which will dissolve and adhere to the penetration part of fasteners according to the amount of current. Electroplating of fasteners generally includes hot-dip galvanizing, copper, nickel, chromium, copper nickel alloy, etc.

2. Hot dip galvanizing of fasteners the hot-dip galvanizing of fasteners is to infiltrate the carbon steel fasteners into the molten zinc plating bath with a concern of 510 ℃. In this way, the iron zinc alloy material on the fastener surface will change to passivation treatment zinc, and then the actual effect of surface treatment can be obtained. The cost of hot-dip galvanizing of fasteners is higher than that of electroplating, about 1.5 to 2 yuan per kilogram.
3. Mechanical equipment plating of fasteners mechanical equipment plating of fasteners means that according to special physical and organic chemical methods, the powder of coated metal materials is used to impact the surface of fasteners, so the coated metal materials will produce coating on the surface of fasteners according to the way of cold welding, so as to achieve the actual effect of surface treatment. The mechanical equipment of fasteners is plated with key parts such as screws, screw caps and gaskets.  
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