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| 银含量对多孔镁银合金组织和耐腐蚀性能的影响 |
| Effect of Ag Contents on Microstructure and Corrosion Resistance of Porous Mg-Ag Alloys |
| Received:January 17, 2017 Revised:March 21, 2017 |
| DOI：10.14093/j.cnki.cn10-1132/d.2018.01.007 |
| 中文关键词: 金属材料 多孔镁银合金 粉末冶金 显微组织 耐腐蚀性能 |
| 英文关键词: metal materials porous Mg-Ag alloy powder metallurgy microstructure corrosion resistance |
| 基金项目:辽宁省自然科学基金-辽宁工业大学联合基金(201602378)、国家自然科学基金(51405215)。 |
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| 中文摘要: |
| 研究了银含量对粉末冶金技术制备的多孔镁银合金显微组织、物相组成和耐腐蚀性能的影响。SEM 分析表明在多孔镁基体中加入银元素后，多孔合金孔壁的晶粒细化，致密度增加。XRD和EDS 分析表明多孔Mg-3%Ag 合金由单相α-Mg 固溶体组成，而Mg-4%Ag 合金由α-Mg 和Mg4Ag两相组成，具有阴极强化性质的Mg4Ag 相呈网状分布在晶界上。耐腐蚀性测试表明，多孔镁银合金比纯多孔镁的耐腐蚀性好。多孔Mg-3%Ag 合金具有最佳的耐腐蚀性能，其自腐蚀电位(-1.4073 V)最大、维钝电流密度(3.4169×10-4 A·cm-2)最低，在人体模拟体液中浸泡48 h 后腐蚀速率(0.162 mm/a)最低，腐蚀后其表面仅有少量的腐蚀产物。 |
| 英文摘要: |
| The effect of Ag contents on microstructure, phase compositions and corrosion resistance for porous Mg-Ag alloys was studied. SEM images show that the compact degree of the material matrix of porous Mg-Ag alloys increases with Ag contents. XRD and EDS results show that porous Mg-3%Ag alloy is composed of α-Mg phase, and that the Mg-4%Ag alloys are composed of α-Mg and Mg4Ag phase which has cathodic strengthening merit and is reticulate in the grain boundary. The porous Mg-Ag alloys have better corrosion resistance than the pure porous Mg, while the porous Mg-3%Ag alloy is the best one. Its maximum self-corrosion potential is -1.4073 V, and its lowest passivation current density is 3.4169×10-4 A·cm-2. After immersed it in simulated body fluid for 48 h, the porous Mg-3%Ag alloys have the lowest corrosion rate and little corrosion products on its surface. |
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