(華南理工大學(xué) 材料科學(xué)與工程學(xué)院，廣州 510640)
摘 要: 采用掃描電鏡(SEM)、能譜(EDS)和X射線衍射(XRD)研究Nd對(duì)Zn-5%Al合金顯微組織的影響，采用電化學(xué)極化曲線和中性鹽霧試驗(yàn)(NSS)研究不同Nd含量對(duì)Zn-5%Al合金耐蝕性的影響。結(jié)果表明：添加稀土Nd有效抑制初生η-Zn相的生長(zhǎng)，顯著增加共晶組織比例且組織致密；適量添加稀土Nd，有助于減小共晶組織層片間距。Nd易與Zn形成Nd2Zn17化合物富集在合金底表面，降低Nd的有效含量，減弱Nd的作用。Zn-5%Al合金耐蝕性隨著Nd含量變化而變化，當(dāng)Nd含量為0.06%時(shí)，合金的耐蝕性最好。
關(guān)鍵字: Zn-5%Al合金；Nd；顯微組織；耐蝕性
（School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China）
Abstract:The effect of Nd addition on the microstructure of Zn-5%Al alloy was investigated by SEM, EDS, XRD, and the corrosion resistance of the alloy was studied by the polarization curves tests and NSS tests. The results show that the growth of the primary η-Zn phase can be effectively inhibited, and the compact eutectic structure of the alloy can be obtained due to the addition of Nd. The lamellar spacing of eutectic structure of the alloy with the optimal concentration of Nd can be decreased. Nd can be easy to react with Zn and form the intermetallic phase Nd2Zn17 particles in the alloy bath, which will reduce the effective content of element Nd in the alloy bath. The corrosion resistance of the Zn-5%Al alloy will be changed with Nd addition, and the best corrosion resistance of the alloy will be attained when Nd addition is 0.06%.
Key words: Zn-5%Al alloy; Nd; microstructure; corrosion resistance
