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| INFLUENCE OF TRACE RARE EARTH ELEMENTS ON MICROSTRUCTURE AND CORROSION RESISTANCE OF HAl77-2 COPPER ALLOY |
| LIN Gaoyong, YANG Wei, WAN Yingchun, TANG Pengjun, ZHANG Shenghua |
| Key Laboratory of Nonferrous Metals Materials Science and Engineering of Ministry of Education, School of Materials Science and Engineering, Central South University, Changsha 410083 |
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Abstract Effects of trace rare earth (RE) elements on microstructure and mechanical properties of HAl77-2 Al-brass were analyzed by OM and conventional mechanical test. Static corrosion experiment was used to study the corrosion behavior of the Al-brass after adding RE addition and SEM, energy analysis and XRD were simultaneously used to investigate the corrosion product layer synthetically. It was demonstrated that adding RE to Al-brass could refine grain and increase strength, but decrease the elongation; The corrosion resistance of the RE-containing Al-brass was better than that of Al-brass without RE in NaCl (3.5 mass%) solution. The consequence of such good corrosion resistance was attributed to the formation of compact protective film on alloy surface which contained RE elements. The RE-contained film, which was composed of an inner Al2O3, RE oxide and an outer chloride or basic chloride of Cu, Zn, combined with the matrix firmly and was difficult to fall off from the alloy surface. While the addition of RE could not improve the corrosion resistance of Al-brass. in NaCl (3.5 mass%) +S2- solution. Although the corrosion products layer was ameliorated due to the RE addition, the corrosion resistance of the alloy deteriorated yet owing to the severe embrittlement of the corrosion product layer caused by Cu2S.
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Received: 03 June 2009
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Corresponding Authors:
LIN Gaoyong
E-mail: gylin1966@yahoo.com.cn
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