摘要
将0.4%(质量分数,下同)的Nd添加到Mg-6Zn-1Mn-0.5Ca合金中,以研究稀土元素Nd对合金显微组织和耐生物腐蚀性能的影响。采用金相(OM)、带能谱的扫描电镜(SEM+EDS)以及XRD等手段分析了合金的微观组织。采用静态浸泡、析氢和电化学极化等手段研究了合金在模拟体液(SBF)中的耐腐蚀性能。结果表明,随着Nd的添加,合金的显微组织得到了明显的细化。在Mg-6Zn-1Mn-0.5Ca-0.4Nd合金中形成了2种第二相的机械混合物Ca2Mg6Zn3+Mg41Nd5。在SBF中浸泡7d以后,较多的此种混合物仍残留于含Nd合金的表面,而在不含Nd的合金中,只有极少量的颗粒状Ca2Mg6Zn3残留在其表面。故Nd的添加显著提高了Mg-6Zn-1Mn-0.5Ca合金的耐生物腐蚀性能。
In order to investigate the effect of Nd on the microstructure and corrosion resistance of Mg-Zn-Mn-Ca alloy, 0.4 wt% Nd was added into Mg-6Zn-1Mn-0.5Ca alloy. OM, SEM equipped with EDS and XRD were used to characterize the microstructures, and crystal structures. The bio-corrosion resistance were studied by immersion corrosion, hydrogen evolution and electrochemical measurement in simulated body fluid （SBF）. Results show that the grain size decreases with the addition of Nd. A mixture of secondary phases Ca2Mg6Zn3＋Mg41Nd5 is found in Mg-6Zn-1Mn-0.5Ca-0.4Nd alloy. After immersion in SBF for 7 d, more such mixture still remains on the Nd-containing alloy surface, whereas few Ca2Mg6Zn3 particles remain on the alloy without Nd. Thus, the bio-corrosion resistance increases due to presence of Nd.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2013年第4期661-666,共6页
Rare Metal Materials and Engineering
基金
National Key Technologies R&D Program (2011BAE22B04)
关键词
医用镁合金
ND
显微组织
耐生物腐蚀性能
medical magnesium alloy
Nd
microstructure
bio-corrosion resistance
