Common surface treatments Ni/Cu/Ni Phosphating Blue White Zn Black epoxy resin 镀层类型 Type镀层厚度 Thickness颜色 Color使用温度Temperature老化时间PCT耐盐雾时间SST特征 Characteristic蓝白锌 Zn5~7μm蓝白色 Blue Silver≤160℃—>24Hr一般防护 Regular Protection彩锌 Color Zinc5~7μm蓝白色 Blue Silver≤160℃—>48Hr一般防护 Regular Protection镍铜镍NiCuNi>12μm银色 Silver≤200℃>48Hr>48Hr耐盐雾、耐湿热 Excellent humidity & salt spray resistance环氧 Epoxy>10μm黑色 Black≤120℃>48Hr>168Hr耐盐雾、耐湿热 Excellent humidity & salt spray resistance磷化 phosphorization—蓝紫色或黑色 bluish violet——<2Hr Emerge in 3% NaCl liquor临时性保护 Temporary ProtectionNotes: For different products, the Salt Spray Test and PCT time varies with the shape of the products.