热处理对CuAlNi形状记忆合金腐蚀性能的影响（英文）

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英文篇名：Effect of heat treatment on corrosion properties of CuAlNi shape memory alloy 作者：L.VRSALOVI? ; I.IVANI? ; S.KO?UH ; S.GUDI? ; B.KOSEC ; M.GOJI? 英文作者：L.VRSALOVI?;I.IVANI?;S.KO?UH;S.GUDI?;B.KOSEC;M.GOJI?;Department of Electrochemistry and Materials Protection, Faculty of Chemistry and Technology,University of Split;Faculty of Metallurgy, University of Zagreb;Faculty of Natural Sciences and Engineering, University of Ljubljana; 关键词：CuAlNi合金 ; 腐蚀 ; 极化 ; 电化学方法 ; SEM 英文关键词：CuAlNi alloy;;corrosion;;polarisation;;electrochemical methods;;SEM 中文刊名：ZYSY 英文刊名：中国有色金属学报(英文版) 机构：Department of Electrochemistry and Materials Protection, Faculty of Chemistry and Technology,University of Split;Faculty of Metallurgy, University of Zagreb;Faculty of Natural Sciences and Engineering, University of Ljubljana; 出版日期：2018-06-15 出版单位：Transactions of Nonferrous Metals Society of China 年：2018 期：v.28 基金：supported by the Croatian Science Foundation under the project IP-2014-09-3405 语种：英文; 页：ZYSY201806010 页数：8 CN：06 ISSN：43-1239/TG 分类号：94-101

摘要

通过开路电位测试、极化技术和电化学阻抗谱法研究热处理对CuAlNi形状记忆合金腐蚀性能的影响,测试条件为:0.9%NaCl溶液,pH=7.4和T=37°C。对比研究铸态和分别在850、885和920°C退火+水冷淬火后的CuAlNi合金样品。电化学阻抗谱法的结果显示,热处理后的CuAlNi合金其电荷转移电阻和表层电阻增加、双层表面和表层电容值降低,说明与铸态合金相比,热处理提高了合金的耐腐性。极化电阻的增加和腐蚀电流密度的降低也表明热处理对CuAlNi合金的耐腐蚀性能有利。对极化曲线测试后的样品表面进行光学显微镜、SEM/EDX和XRD分析。结果表明,电极表面发生点蚀,腐蚀产物为Cu Cl_2、Al Cl_3和Cu_2Cl(OH)_3。
        The effect of heat treatment on corrosion properties of CuAlNi shape memory alloy was investigated in 0.9% Na Cl solution at p H 7.4 and 37 °C by open circuit potential measurements, polarisation techniques, and electrochemical impedance spectroscopy. Investigations were performed on CuAlNi alloy samples in as-cast state and after heat treatment procedure containing annealing at 850, 885 and 920 °C followed by water quenching. Electrochemical impedance measurement results indicate that heat treatment of CuAlNi alloy leads to the increase in charge transfer resistance and surface layer resistance and the decrease in values of capacitance of the double and surface layers, indicating higher corrosion resistance compared with the as-cast CuAlNi alloy. The increase in polarisation resistance and the decrease in corrosion current density of heat-treated CuAlNi alloy also suggest beneficial influence of heat treatment on corrosion resistance of CuAlNi alloy. Optical microscopy, SEM/EDX and XRD analysis of samples surface after polarisation measurements show the occurrence of pitting corrosion on the electrode surfaces, with the existence of CuCl_2, AlCl_3 and Cu_2Cl(OH)_3 compounds as the surface corrosion products.

引文

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