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电积铜用新型Pb-Ca-Sn-Re合金阳极的制备及其性能 被引量:3
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作者 杨桂生 杨志鸿 +1 位作者 陈步明 郭忠诚 《材料保护》 CAS CSCD 北大核心 2019年第9期147-152,159,共7页
为了获得机械强度高、电化学性能优良的铜电积铅基合金阳极材料,采用合金重熔法制备了Pb-1.00%Ca、Pb-0.06%Ca-0.60%Sn、Pb-0.06%Ca-0.60%Sn-0.10%Re合金;通过金相分析、硬度测试研究了稀土元素对合金组织及力学性能的影响,采用扫描电镜... 为了获得机械强度高、电化学性能优良的铜电积铅基合金阳极材料,采用合金重熔法制备了Pb-1.00%Ca、Pb-0.06%Ca-0.60%Sn、Pb-0.06%Ca-0.60%Sn-0.10%Re合金;通过金相分析、硬度测试研究了稀土元素对合金组织及力学性能的影响,采用扫描电镜(SEM),X射线衍射(XRD)、阳极极化、Tafel曲线、循环伏安(CV)曲线对3种合金阳极的耐蚀性及电催化活性进行了研究。结果表明:稀土元素可以抑制导电性较差的PbSO4的生成,促进导电性好的PbO2的生成,从而降低阳极电位,提高电催化活性;同时膜层变得更加致密,其中Pb-0.06%Ca-0.60%Sn-0.10%Re合金的电催化活性和耐腐蚀性能最好。 展开更多
关键词 铅基合金阳极 re稀土 金相组织 耐蚀性能 电催化活性
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Structural and corrosion characterization of biodegradable Mg-RE (RE=Gd, Y, Nd) alloys 被引量:18
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作者 J.KUBSEK D.VOJTěCH 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第5期1215-1225,共11页
Binary Mg-Gd (up to 5% Gd in mass fraction), Mg-Nd (up to 9% Nd in mass fraction) and ternary Mg-Gd-Y (up to 5% Gd, 1% Y) alloys with precisely determined contents of cathodic impurities (Fe, Ni, Cu, Co) were ... Binary Mg-Gd (up to 5% Gd in mass fraction), Mg-Nd (up to 9% Nd in mass fraction) and ternary Mg-Gd-Y (up to 5% Gd, 1% Y) alloys with precisely determined contents of cathodic impurities (Fe, Ni, Cu, Co) were studied. The alloys were studied in the as-cast state (cooling rate of 500 K/min) and after solution heat treatment (T4). Structures were investigated by optical and scanning electron microscopy, energy dispersive spectrometry, X-ray diffraction and glow discharge spectrometry. Structural investigation was completed by Vickers hardness measurements. Corrosion behavior in the simulated physiological solution (9 g/L NaCl) was assessed by immersion tests and potentiodynamic measurements. It was found that the structures of the as-cast alloys were dominated by fine a-Mg dendrites and eutectic Mg-RE phases. The dendrites exhibited RE-concentration gradients which were most pronounced in the Mg-Gd alloys. For this reason, the T4 heat treatment of the Mg-Gd alloy led to the formation of a new cuboidal Mg5Gd phase. The corrosion resistance was significantly improved by Gd. The effect of Nd was weak and the addition of Y to Mg-Gd alloys had harmful effect on the corrosion resistance. The T4 heat treatment strongly accelerated the corrosion of Mg-Gd alloys. Its effect on the corrosion of Mg-Nd alloys was not significant. The observed corrosion behavior of the alloys was discussed in relation to their structural states and contents of cathodic impurities. 展开更多
关键词 biodegradable material MAGNESIUM rare earths Mg-RE alloy structure CORROSION
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Ce含量对Mg2.2Sn1Al0.5Zn合金显微组织和力学性能的影响
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作者 赵文博 瞿祥落 +1 位作者 罗晓航 许春香 《中国铸造装备与技术》 CAS 2014年第6期40-43,共4页
利用OM、XRD、SEM、EDS等方法,研究了不同Ce含量对Mg-2.2Sn-1Al-0.5Zn合金显微组织和力学性能的影响。结果表明:添加适量的稀土Ce能细化晶粒,Ce与Al结合形成高熔点的稀土相Al4Ce,使β-Mg17Al12相数量减少;针状或杆状Al4Ce相分布在晶界周... 利用OM、XRD、SEM、EDS等方法,研究了不同Ce含量对Mg-2.2Sn-1Al-0.5Zn合金显微组织和力学性能的影响。结果表明:添加适量的稀土Ce能细化晶粒,Ce与Al结合形成高熔点的稀土相Al4Ce,使β-Mg17Al12相数量减少;针状或杆状Al4Ce相分布在晶界周围,阻止了位错运动;合金的抗拉强度、塑性和硬度均随Ce含量的增加呈现先增加后降低的趋势,当Ce含量为0.6%时合金的力学性能最佳。对断口进行扫描分析证明拉伸断裂为穿晶断裂和韧性断裂的混合断裂。 展开更多
关键词 Mg-Sn 合金 显微组织 力学性能
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Microstructures and mechanical properties of Mg-2%Zn-0.4%RE alloys 被引量:2
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作者 乐启炽 张志强 +2 位作者 邵志文 崔建忠 谢一 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第B07期352-356,共5页
The solidification microstructures and hardness of Mg-2%Zn (mass fraction) based alloys with addition of 0.4%Ce, 0.4%Gd, 0.4%Y or 0.4%Nd (mass fraction) were investigated, and the effects of the rare earth elements on... The solidification microstructures and hardness of Mg-2%Zn (mass fraction) based alloys with addition of 0.4%Ce, 0.4%Gd, 0.4%Y or 0.4%Nd (mass fraction) were investigated, and the effects of the rare earth elements on the microstructures and mechanical properties of these alloys extruded at 310℃ were also compared. The results indicate that the trace rare earth Ce, Gd, Y or Nd in the Mg-2%Zn alloy has obviously different grain refinement effects on its solidification microstructures, and the as-cast and hot-extruded alloy with 0.4%Ce has the smallest average grain size and the highest strength. However, the extruded alloys containing 0.4%Nd or 0.4%Y with the elongation of 26.6% and 30%, respectively, show higher plasticity in spite of lower strength as compared with the alloy containing 0.4%Ce. 展开更多
关键词 rare earth Mg-2%Zn alloy microstructure mechanical properties
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