李捷帆,马莹,惠增哲,等.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[J].精密成形工程,2016,8(2):26-29.
LI Jie-fan,MA Ying,HUI Zeng-zhe,et al.Comparison of Corrosion Performance of AS-cast and Extruded AZ31 Alloy in 3.5% Sodium Chloride Water Solution[J].Journal of Netshape Forming Engineering,2016,8(2):26-29. |
| 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 |
| 投稿时间：2015-11-20 修订日期：2016-03-10 |
| 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） |
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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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