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V、Zr 复合微合金化调控Al-Si-Cu-Mg合金 耐蚀性能研究
Study of the Corrosion Resistance of Al-Si-Cu-Mg Alloy Enhanced by V and Zr Co-microalloying
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- DOI:
- 作者:
- 刘志斌1，2，王 瑞1，3，王东涛1，3，钟纪康1，2，张鸣鹤1，3，张孝足 1，3，孙岚曦 1，3
LIU Zhibin1,2, WANG Rui1,3, WANG Dongtao1,3, ZHONG Jikang1,2, ZHANG Minghe1,3, ZHANGXiaozu1,3, SUN
- 作者单位:
- 1. 苏州大学高性能金属结构材料研究院，江苏苏州215000；2.辽宁工业大学材料科学与工程学院， 辽宁 锦州 121001；3. 苏州大学沙钢钢铁学院，江苏苏州215000
1. High-Performance Metal Structural Materials Research Institute, Soochow University, Suzhou 215000, China; 2. School of Materials Science and Engineering, Liaoning University of Technology, Jinzhou 121001, China; 3. School of Iron and Steel, Soochow University, Suzhou 215000, China
- 关键词:
- Al-Si-Cu-Mg 合金；V、Zr 含量；耐蚀性；电化学分析
Al-Si-Cu-Mg alloy; V, Zr addition; corrosion resistance; electrochemical analysis
- 摘要:
- 高Cu含量的Al-Si-Cu-Mg系列合金因具有优异的强韧性被广泛应用于汽车工程关键零部件，但含Cu强 化相会极大削弱合金的耐蚀性能，使其应用范围受限。为此，以常用的Al-9Si-4Cu-0.22Mg合金为基础，通过显微组织观 察和电化学测试，分析V、Zr复合微合金化对合金耐蚀性能的影响。结果表明，V和Zr的添加均使合金耐蚀性能有所提 高，但V添加量超过0.13%(质量分数)后耐蚀性能下降。腐蚀形貌观察结果表明，V、Zr复合微合金化显著减弱了点蚀趋 势。 电化学测试结果表明，添加0.13%V、0.19%Zr(质量分数)的合金(A12)具有最佳的耐蚀性能，腐蚀电流密度比基础合 金降低51.6%，等效钝化膜厚度增加129%，钝化膜得到强化是耐蚀性能提高的主要原因。Al-Si-Cu-Mg series alloys with high Cu contents are widely used in automotive engineering because of their excellent strength and toughness, but the inclusion of Cu greatly reduces their corrosion resistance, limiting their application range. Therefore, on the basis of the commonly used Al-9Si-4Cu-0.22Mg alloy, the effects of V and Zr co-microalloying on the corrosion resistance of the alloy were investigated via microstructure observation and electrochemical testing. The results show that the addition of both V and Zr improve the corrosion resistance. However, when the addition of V exceeds 0.13 wt.%, the corrosion resistance of the alloy decreases. The corrosion morphology observations reveal that V and Zr co-microalloying significantly reduce the tendency for pitting. The electrochemical test results show that the A12 alloy with 0.13 wt.% V and 0.19 wt.% Zr has the best corrosion resistance, with a corrosion current density reduction of 51.6% and an equivalent passive film thickness increase of 129%. The strengthening of the passive film is the main reason for the improved corrosion resistance