Nd-Fe-B粉末無電鍍鎳之防蝕效果評估

Evaluation of Anti-Corrosion Effect of the Nd-Fe-B Powders Coated With Electroless Nickel Plating

本研究係利用無電鍍方法在Nd-Fe-B粉末表面鍍上一層鎳磷合金薄膜，經壓成膠磁後，再分別施予HMTA酒精溶液及水性PU溶液浸泡。研究內利用ICP-AES分析Nd-Fe-B粉末之化學組成，並利用SEM觀察其表面形態，再由90% RH, 80℃環境試驗評估披覆後之Nd-Fe-B粉末及其膠磁之防蝕效果。由研究結果顯示，採用中磷無電鍍鎳表處方法，可改善Nd-Fe-B粉末之耐蝕性，惟其壓成膠磁後會產生爆裂現象；若其膠磁經過透明水性PU溶液浸泡，爆裂現象即可改善，其防蝕效果亦能明顯提升。

In this study, the Nd-Fe-B powders coated by Ni-P alloy film with electroless nickel process was investigated. The coated Nd-Fe-B powders were pressed to the Nd-Fe-B magnets and then these magnets were immersed in HMTA alcohol solution or PU aqueous solution. We analyzed the compositions of the Nd-Fe-B powders by ICP-AES and observed the surfaces of the Nd-Fe-B powders by SEM. Furthermore, We examined the anti-corrosion effect of the coated Nd-Fe-B powders and their magnets with environment test at the condition of 90% RH and 80 . The results showed that the anti-corrosion effect of the Nd-Fe-B powders coated with electroless nickel was improved. However, the magnets made of Nd-Fe-B powders coated with electroless nickel always produced a crack on the surface. This phenomenon disappeared after the magnets immersed in PU aqueous solution. This anti-corrosion effect of the Nd-Fe-B magnets coated with electroless nickel was also improved obviously.