Coating thickness / corrosion resistance (neutral salt spray) / cost / remarks
Screw surface treatment is a commonly used processing method for screws, which can not only improve the surface brightness of screws, but also improve the performance of screws.
Screw surface treatment process:Oxidation black Coating thickness:about 1um oxide layer
Corrosion resistance (neutral salt spray):1-3 hours Cost:low
Screw surface treatment process:black nickel, white nickel Coating thickness:Copper: 0.5-1um Nickel: 2-10um Corrosion resistance (neutral salt spray):6-12 hours Cost:middle Remark:Re-plating products above 10um
Screw surface treatment process:white zinc, blue zinc Coating thickness:Zinc: 2-10um Corrosion resistance (neutral salt spray):6-12 hours Cost:middle
Screw surface treatment process:green zinc Coating thickness:Zinc: 2-10um Corrosion resistance (neutral salt spray):8-20 hours Cost:middle Remark:Due to the limited use in the industry, only one sample from one manufacturer was collected, which is not representative.
Screw surface treatment process:black zinc Coating thickness:Zinc: 2-10um Corrosion resistance (neutral salt spray):20-40 hours Cost:middle
Screw surface treatment process:Color zinc Coating thickness:Zinc: 3-15um Corrosion resistance (neutral salt spray):more than 48 hours Cost:middle
Screw surface treatment process:Electrophoresis black Coating thickness:The coating is about 15um Corrosion resistance (neutral salt spray):More than 100 hours Cost:High (less than stainless iron and stainless steel)
Screw surface treatment process:Dacromet Coating thickness:Coating about 5-40um Corrosion resistance (neutral salt spray):More than 100 hours Cost:High (less than stainless iron and stainless steel) Remark:Poor coating uniformity
Screw surface treatment process:304 stainless steel(Surface electrolysis) Coating thickness:/ Corrosion resistance (neutral salt spray):more than 48 hours Cost:High Remark:Surface cleaning
Screw surface treatment process:stainless iron Coating thickness:/ Corrosion resistance (neutral salt spray):about 20 hours Cost:High (less than stainless steel) Remark:Surface cleaning
