文章摘要
铸态和挤压态 AZ31 镁合金在 3.5%的 NaCl 溶液中的腐蚀性能比较
Comparison of Corrosion Performance of AS-cast and Extruded AZ31 Alloy in 3.5% Sodium Chloride Water Solution
Received:November 20, 2015  Revised:March 10, 2016
DOI：10.3969/j.issn.1674-6457.2016.02.006
中文关键词: 镁合金  腐蚀  NaCl溶液  极化曲线
英文关键词: magnesium alloy  corrosion  NaCl solution  polarization curve
基金项目:陕西省科技计划（2010K10-08） ;陕西省教育厅科学研究计划（2013JK0906） ;陕西省光电功能材料与器件重点实验室项目 （ZSKJ201302）
Author NameAffiliation
LI Jie-fan School of Materials Science & Engineering， Xi′an University of Technology， Xi′an 710048， China 
MA Ying School of Materials Science & Engineering， Xi′an University of Technology， Xi′an 710048， China 
HUI Zeng-zhe School of Materials and Chemical Engineering， Shaanxi Key Laboratory of Optoelectronic Functional Materials and Devices， Xi′an Technological University， Xi′an， 710032， China 
XU Chun-jie School of Materials Science & Engineering， Xi′an University of Technology， Xi′an 710048， China 
ZHANG Zhong-ming 1. School of Materials Science & Engineering， Xi′an University of Technology， Xi′an 710048， China；2. School of Materials and Chemical Engineering， Shaanxi Key Laboratory of Optoelectronic Functional Materials and Devices， Xi′an Technological University， Xi′an， 710032， China 
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中文摘要:
      目的 研究铸态和挤压态AZ31镁合金在3.5% NaCl溶液中的腐蚀性能。方法 采用光学显微镜和X射线衍射分析了铸态AZ31镁合金挤压前后的显微组织。利用静态浸泡失重实验和电化学实验研究了铸态和挤压态AZ31镁合金在3.5% NaCl溶液中的腐蚀性能。结果 热挤压可有效细化AZ31合金的晶粒， 铸态试样的平均晶粒大小约为111 μm， 挤压态试样的平均晶粒大小约为9 μm。AZ31镁合金在3.5% NaCl溶液中的腐蚀初期， 合金表面没有发生钝化。挤压后合金的自腐蚀电位从铸态的-1.55 V提高到-1.52 V。浸泡72 h后， 铸态试样的腐蚀速率为4.293 mm/a， 挤压态试样的腐蚀速率为2.957 mm/a。结论 挤压提高了AZ31镁合金在3.5% NaCl溶液中的腐蚀性能。
英文摘要:
      The aim of this study was to investigate the corrosion performance of AZ31 alloy in 3.5% sodium chloride water solution.Optical microscopy and X-ray diffraction analysis were performed to examine microstructure of AZ31 alloys before and after hot extrusion. The corrosion behavior of the alloys prepared by as-casting and extrusion were investigated in 3.5% NaCl aqueous solution by immersion and electrochemical tests.The results indicated that the hot extrusion can obviously reduce the grain size of AZ31 alloy.The average grain size of the as-cast alloy was about 111 m， and the average size of the hot extruded alloy was about 9 m.There was no surface passivation at the initial stage during immersion corrosion of the AZ31 alloy in 3.5% sodium chloride water solution. The corrosion potential of the AZ31 alloy at as-cast state was -1.55 V， and increased to -1.52 V at extruded state. When the AZ31 was immersed for 72 h， the average corrosion rates of as-cast and extruded alloys were 4.293 mm/a and 2.957 mm/a， respectively. Hot extrusion can improve the corrosion resistance of AZ31 alloy in 3.5% NaCl solution.
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