Surface Treatment Specifications
Since the Neodymium and Iron elements in NdFeB permanent magnets are highly susceptible to corrosion and oxidation, electroplating is necessary to protect the magnet surface. Commonly used coatings include Zinc (Zn), Nickel+Copper+Nickel (NiCuNi), Gold, Silver, Chrome, and Black Epoxy.
| Coating Type | Color | Thickness (μm) | SST Testing (H) | PCT (H) | Humidity & Heat Testing (H) | Suggested Temp (°C) | Characteristics |
|---|---|---|---|---|---|---|---|
| NiCuNi (Rolling / Hanging) |
Silver | 10-25 | 24 | 48 | 500 | 200 | Good hardness and anti-corrosion |
| Black NiCuNi | Gun Metal | 12-25 | 48 | 48 | 500 | 200 | Nice appearance, excellent decoration |
| Ni + Cr (Chrome) | Dark Silver | 12-20 | 48 | 48 | 500 | 200 | Excellent hardness, antifriction |
| Ni + Au (Gold) | Gold | 12-20 | 48 | 48 | 500 | 160 | Good conduction and decoration |
| Ni + Ag (Silver) | Silver | 12-20 | 48 | 48 | 500 | 160 | Good conduction and decoration |
| Zn Cr3+ (Trivalent Zinc) | Blue-White | 5-10 | 15 | - | 48 | 70 | Common anti-corrosion |
| Black/Grey Epoxy | Black/Grey | 12-25 | 72 (Black) 24 (Grey) |
72 | 120 | 130 | Excellent anti-corrosion |
| Teflon | Black/Grey | 8-15 | 24 | 48 | 120 | 260 | High temperature resistance, self-lubricating |
Remarks: Testing duration is dependent on the shape and size of the product. The data above is for reference only and does not constitute a final test report or supply agreement.
