(1. 太原理工大學(xué) 材料科學(xué)與工程學(xué)院，太原 030024；
2. 太原理工大學(xué) 新材料界面科學(xué)與工程教育部重點(diǎn)實(shí)驗(yàn)室，太原 030024；
3. 晉中職業(yè)技術(shù)學(xué)院 機(jī)電工程系，榆次 030600)
摘 要: 采用真空擴(kuò)散鋅釔共滲方法，在400 ℃下對(duì)純鎂進(jìn)行表面合金化改性處理。采用OM、SEM、EDS、XRD和顯微硬度、電化學(xué)腐蝕極化曲線測(cè)試等方法對(duì)滲層的組織結(jié)構(gòu)、顯微硬度和腐蝕性能進(jìn)行分析。結(jié)果表明：表面合金化處理后，純鎂表面獲得了致密的厚約2.7 mm的合金反應(yīng)滲層，滲層由金屬間化合物Mg7Zn3、α-Mg飽和固溶體、α-Mg和I-Phase(Mg40Zn55Y5 或Mg30Zn60Y10)片層共晶組織構(gòu)成；該鋅釔共滲層的顯微硬度有很大的提高，并明顯改善了純鎂在5% NaCl溶液中的耐腐蝕性能。
關(guān)鍵字: 純鎂；鋅釔共滲層；顯微硬度；耐蝕性
（1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2. Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education,
Taiyuan University of Technology, Taiyuan 030024, China;
3. Department of Machine and Electric Engineering, Jinzhong Vocational Technology Institute, Yuci 030600, China）
Abstract: Surface modification treatment on pure magnesium was conducted at 400 ℃ by vacuum solid zinc-yttrium co-diffusing. The microstructure, microhardness and corrosion resistance of the zinc-yttrium co-diffusing layer were investigated by OM, SEM, EDS, XRD, microhardness test and electrochemical corrosion polarization curves test. The results show that the zinc-yttrium co-diffusing layer with an thickness of 2.7 mm forms on the surface of pure magnesium after surface modification treatment. The dense layer is composed of intermetallic compounds Mg7Zn3, α-Mg saturate solution, α-Mg and I-phase (Mg40Zn55Y5 or Mg30Zn60Y10) lamellar eutectic phases. The microhardness of the surface diffusion alloying layer increases significantly and its corrosion resistance in 5% NaCl solution also improves obviously.
Key words: pure magnesium; zinc-yttrium co-diffusing layer; microhardness; corrosion resistance
