Surface Coating
| Surface coating | Coating method | Coating thickness (μm) | Coating color | Coating features |
| Zinc | Plating | ≥ 5 | Silvery blue | Has strong corrosion resistance. |
| Gold | Plating | ≥ 5 | Gold | Has outstanding resistance to high temperature capability, corrosion resistance, good resistance to color change ability. |
| Ni-Cu-Ni | Plating | 15-30 | Silver | strong corrosion resistance. |
| Epoxy | Electrophoresis | 15-20 | Black / Grey | Strong corrosion resistance, outstanding resistance to salt spray, strong resistance to high temperature, high humidity capacity. |
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