试验环境对Al-Si系压铸合金腐蚀形态及力学性能的影响研究  

Research on the Effects of Test Environment on Corrosion Morphologies and Mechanical Properties of Al-Si Die Casting Alloys

作　　者：张鑫 李伟 乔小兵 谢文才[1] 周胜蓝 Zhang Xin;Li Wei;Qiao Xiaobing;Xie Wencai;Zhou Shenglan(Commercial Vehicle Development Institute,FAW Jiefang Co.,Ltd.,Changchun 130011)

机构地区：[1]一汽解放汽车有限公司商用车开发院,长春130011

出　　处：《汽车工艺与材料》2023年第2期9-15,共7页Automobile Technology & Material

摘　　要：采用中性盐雾和循环腐蚀2种试验方法,对比不同试验环境对A380、YL113、YL104压铸铝合金的腐蚀形貌、典型腐蚀深度、腐蚀产物及力学性能影响,探究腐蚀产物构成及其腐蚀机理。经504 h中性盐雾和60天循环腐蚀试验后,结果表明,3种压铸铝合金中A380合金的耐蚀性最差,2种试验环境下其抗拉强度分别较试验前降低了31%和38%;YL113合金性能降幅次之,2种试验环境下其抗拉强度分别较试验前降低13%和25%;YL104合金性能降幅最小,2种试验环境下其抗拉强度分别较试验前降低3.6%和1%。3种压铸铝合金发生腐蚀根因在于:基体内各相间电位差及试样表面的潮湿环境构成了电化学腐蚀,导致腐蚀发生。2 test methods,i.e.neutral salt spray method and cyclic corrosion method are utilized to study the effects of different test environments on the corrosion morphology,typical corrosion depth,corrosion products and mechanical properties of A380,YL113 and YL104 alloys.The composition of corrosion products and its corrosion mechanism are explored.The results show that,after 504 h neutral salt spray and 60 days cyclic corrosion test,the corrosion resistance of A380 alloy is the worst among the 3 die-casting aluminum alloys.Under the 2 test environments,the tensile strength of A380 alloy is reduced by 31%and 38%respectively;followed by YL113 alloy,its tensile strength decreases by 13%and 25%respectively;the tensile strength of YL104 alloy decreases by 3.6%and 1%respectively.The root cause of corrosion of these die casting alloys is that,the potential difference between phases in the matrix and the humid environment on the sample surface constitute electrochemical corrosion,which leads to corrosion.

关 键 词：AL-SI系合金 腐蚀机理 力学性能 中性盐雾 循环腐蚀 

分 类 号：U465.22[一般工业技术—材料科学与工程]