铸造技术2026，Vol.47Issue(8)：903-911,9.DOI:10.16410/j.issn1000-8365.2026.6030
Cr/Zr微合金化调控铸造Al-Cu-Mg-Si合金点蚀倾向性研究
Study on Pitting Tendency Control of Cast Al-Cu-Mg-Si Alloy by Cr/Zr Microalloying
孙岚曦 1袁祥耀 1王瑞 1钟纪康 2王东涛 1长海博文1
作者信息
- 1. 苏州大学高性能金属结构材料研究院,江苏苏州 215000||苏州大学金属材料与先进制造学院,江苏苏州 215000
- 2. 苏州大学高性能金属结构材料研究院,江苏苏州 215000||辽宁工业大学材料科学与工程学院,辽宁锦州 121001
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摘要
Abstract
Al-Cu-Mg-Si is a commonly used high-strength cast aluminium alloy series;however,the presence of Cu-containing phases causes severe pitting in chloride-containing environments,which significantly limits its application potential.In the present work,the initiation and propagation of pitting in cast Al-5.6Cu-0.3Mg-0.3Si alloys were systematically analysed by observing corrosion morphologies via SEM combined with electrochemical analysis.The development of a high-pit resistance alloy was achieved by the addition of Cr or Zr.The results indicate that the initiation of pitting occurs at Cu-containing phases and that the propagation of pitting occurs along grain boundaries.The size of pitting is correlated with the distribution of Cu-containing phases,and the addition of Cr or Zr significantly reduces the size of Cu-containing phases present at grain boundaries by grain refinement,thereby reducing the size of pitting.Compared with the base alloy,the addition of Cr or Zr increaseds the equivalent thickness of the passive films by 112％and 171％,respectively,and the substantial increase in charge transfer resistance is the primary factor in inhibiting interfacial electrochemical reactions.The alloy with 0.2 wt.％Zr addition exhibiteds decreases in the corrosion current density,maximum pitting depth and pitting area of 68.7％,48.0％and 74.8％,respectively.关键词
微合金化/点蚀抗性/电化学分析/Al-Cu-Mg-Si合金Key words
microalloying/pitting resistance/electrochemical analysis/Al-Cu-Mg-Si alloy分类
矿业与冶金引用本文复制引用
孙岚曦,袁祥耀,王瑞,钟纪康,王东涛,长海博文..Cr/Zr微合金化调控铸造Al-Cu-Mg-Si合金点蚀倾向性研究[J].铸造技术,2026,47(8):903-911,9.
