Ca对铸态Mg-4Zn合金组织及腐蚀性能的影响

发布时间：2018-04-17 20:50

本文选题：镁合金 + 腐蚀　；参考：《材料热处理学报》2015年01期

【摘要】：为开发生物医用镁合金,利用高纯原材料,在氩气气氛保护下熔炼浇铸制备了Ca合金化的Mg-4Zn合金(Ca含量分别为0.4%和1.0%,质量分数)。通过OM、SEM以及XRD分析了合金的微观组织和相组成,采用析氢法、腐蚀质量损失法以及电化学法测试了合金在Hanks模拟体液中的腐蚀行为。结果表明,合金由初生Mg固溶体和共晶体组成;随Ca含量增加,合金的电荷传递电阻减小,自腐蚀电位下降,自腐蚀电流密度增加;析氢法和腐蚀质量损失法均表明合金的腐蚀速率随时间延长而减小。共晶体对合金的耐蚀性有影响;当Ca含量从0.4%增加到1.0%时,共晶体含量增加,促进了合金的电偶腐蚀,合金耐蚀性降低。Mg-4Zn-(0.4,1)Ca合金的腐蚀形式主要为晶间腐蚀和点蚀。
[Abstract]:In order to develop biomedical magnesium alloy, Ca alloying Mg-4Zn alloy was prepared by melting and casting with high purity raw materials in argon atmosphere. The Ca content of Ca alloyed Mg-4Zn alloy was 0.4% and 1.0%, respectively.The microstructure and phase composition of the alloy were analyzed by XRD and XRD. The corrosion behavior of the alloy in Hanks simulated body fluid was measured by hydrogen evolution method, corrosion mass loss method and electrochemical method.The results show that the alloy is composed of primary mg solid solution and eutectic, and the charge transfer resistance decreases, the corrosion potential decreases and the corrosion current density increases with the increase of Ca content.Both the hydrogen evolution method and the mass loss method show that the corrosion rate of the alloy decreases with the increase of time.When Ca content increased from 0.4% to 1.0%, the eutectic content increased, which promoted the galvanic corrosion of the alloy. The corrosion resistance of the alloy decreased. The corrosion forms of the alloy were mainly intergranular corrosion and pitting corrosion.
【作者单位】：西安理工大学材料科学与工程学院陕西省电工材料与熔(浸)渗技术重点实验室;西安航空学院机械工程系;
【基金】：陕西省科技计划项目(2010K10-08) 陕西省教育厅科学研究计划项目(2013JK0906) 陕西省重点学科建设专项资金(陕财办教2008-171)
【分类号】：TG146.22

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