WCp/2024Al基复合材料的腐蚀机理
Corrosion Mechanism of WCp/2024Al Metal Matrix Composite
摘 要
采用动电位阳极极化法对体积分数为11.4% WCp/2024Al基复合材料及其基体合金在3.5% NaCl水溶液中的耐蚀性能进行研究。结果表明, 由于WC颗粒的加入, 提高了WCp/2024Al基复合材料的腐蚀速度。通过对恒电位极化后试样观察发现, WCp/2024Al基复合材料腐蚀机理为富Cu相作为阴极区与其周围的贫Cu区作为阳极区构成电偶腐蚀以及WC颗粒与基体间的协同腐蚀作用。这种双重的电偶腐蚀致使复合材料腐蚀速度加快。
金属基复合材料
腐蚀机理
电偶腐蚀
2024 Al
metal matrix composite
corrosion mechanism
galvanic corrosion
Abstract
The corrosion resistance of 11.4% WCp/2024Al metal matrix composite (MMC) and 2024Al in 3.5% NaCl solution was studied by means of potentiodynamic polarization. The results showed that the corrosion resistance of WCp/2024Al composite was poorer than that of the matrix. The addition of WC particles accelerated the corrosion rate of WCp/2024Al (MMC) greatly. By observing the corrosion test specimens after potentiostatic polarization, the corrosion mechanism of WCp/2024Al MMC was found to be synergy of galvanic corrosion between the WC and the matrix and galvanic corrosion between the phase rich in Cu and the phase poor in Cu. It was the reason that resulted in accelerating the corrosion rate.
中图分类号 TG172
所属栏目 试验研究
基金项目
收稿日期 2011/2/28
修改稿日期 2011/3/22
网络出版日期
作者单位点击查看
联系人作者毛昌辉(mao@grinm.com)
备注毛昌辉,教授,
引用该论文: WANG Dao-bin,MAO Chang-hui,YANG Jian,LIU Kun,LIANG Qiu-shi. Corrosion Mechanism of WCp/2024Al Metal Matrix Composite[J]. Corrosion & Protection, 2012, 33(1): 32
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参考文献
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【4】Winkler S L,Ryan M P,Flower H M. Pitting corrosion in cast 7× × × aluminum alloys and fibre reinforced MMCs[J]. Corrosion Science,2004,46(4): 893-902.
【5】Trazaskoma P P,Mc Caffery E M,Crowe C R. Corrosion behavior of SiC/Al metal matrix composites[J]. J Electrochem Soc,1983,130(9): 1804-1809.
【6】Griffiths A J,Turnbull A. An investigation of the electrochemical polarization behavior of 6061 aluminum metal matrix composites[J]. Corrosion Science,1994,36(1): 23-35.
【7】Shimizu Y,Nishimura T,Matsushima I. Corrosion resistance of Al-based metal matrix composites[J]. Mater Sci Eng A,1995,A198(1/2): 113-118.
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【9】李劲风, 郑子樵, 任文达. 第二相在铝合金局部腐蚀中的作用机制[J]. 材料导报, 2005, 19(2): 81-83.
【10】周云峰, 毛昌辉, 杨剑, 等. WCp/2024铝基复合材料热学性能研究[J]. 金属功能材料,2010,17(5).
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