佳明磁鐵

燒結 Nd₂Fe₁₄B 易被腐蝕，尤其是磁體邊沿，腐蝕會導致產品嚴重變質, 包括將磁鐵粉碎成小磁性微粒的粉末, 或表面層剝落。因此，添加保護塗層來防止接觸大氣層來解決這缺陷。鍍鎳、鍍鋅、雙層銅鎳電鍍或環氧電泳是常見的電鍍方法。

Sintered Nd₂Fe₁₄B tends to be vulnerable to corrosion, especially along grain boundaries of a sintered magnet. This type of corrosion can cause serious deterioration, including crumbling of a magnet into a powder of small magnetic particles, or spalling of a surface layer. This vulnerability is addressed in many commercial products by adding a protective coating to prevent exposure to the atmosphere. Nickel plating, zinc plating, epoxy plating or two-layered copper-nickel plating are the standard methods, although plating with other metals, or polymer and lacquer protective coatings are also in use.