EFFECT OF SCANDIUM ON THE CORROSION BEHAVIOR OF THE CASTING Al-Cu ALLOYS IN NACL SOLUTION
EFFECT OF SCANDIUM ON THE CORROSION BEHAVIOR OF THE CASTING Al-Cu ALLOYS IN NACL SOLUTION
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DOI：
10.1142/s0217979209060336
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发表时间：
2009-03
影响因子：
1.7
通讯作者：
Wengui Zhao;Jin–guo Wang;J. Hou;Q. Jiang
中科院分区：
文献类型：
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作者：
Wengui Zhao;Jin–guo Wang;J. Hou;Q. Jiang
采用浸渍试验和电化学测试方法研究了添加和不添加Sc的铸态Al-Cu合金的腐蚀行为。结果表明，在3.5wt时，合金表面出现点蚀现象。添加Sc的Al-Cu合金的耐蚀性优于不添加Sc的Al-Cu合金。随着Sc含量的增加，Al-Cu合金的耐蚀性变化明显，在0.1wt。% Sc合金具有最好的耐腐蚀性。电化学测量结果表明，含Sc合金的腐蚀电位比不含Sc合金的腐蚀电位正偏移，表明含Sc合金具有更好的耐蚀性。Sc的加入使Al-Cu合金的组织由粗晶转变为细等轴晶，降低了合金的腐蚀敏感性，提高了合金的耐蚀性。
Corrosion behavior of the casting Al-Cu alloys with and without Sc addition was studied by both the immersion test and electrochemical measurement methods. The results show that pitting corrosion was found on the surfaces of these alloys in 3.5wt.% NaCl solution, while the corrosion resistance of the Al-Cu alloys with Sc is better than that of the Al-Cu alloy without Sc. With increasing Sc content, the corrosion resistance of the present Al-Cu alloys varies significantly, and the 0.1wt.% Sc alloy has the best corrosion resistance. Also, the corrosion potential of the present alloys with Sc is shifted positively compared with that of the alloy without Sc by electrochemical measurement, indicating that the alloys with Sc have better corrosion resistance. The microstructures of the Al-Cu alloys change from the coarse grains to the fine equiaxed grains due to Sc addition, which is responsible for the reduced susceptibility to corrosion and the enhanced corrosion resistance of the present alloys.