组织超细化对ZK60镁合金腐蚀行为的影响
Effect of Grain Ultrafining on Corrosion Behavior of ZK60 Mg Alloy
摘 要
借助等通道转角挤压(ECAP)模具制备了超细晶ZK60镁合金, 结合时效处理调控了合金中第二相的分布形态, 采用局部电化学阻抗谱(LEIS)结合浸泡试验,分析了组织超细化及小尺度第二相对ZK60镁合金电化学腐蚀行为的影响。结果表明, 固溶态ZK60镁合金在3.5% NaCl溶液中的失重速率随着ECAP加工道次的增加而增加; 随着浸泡时间的增加, 超细晶合金的局部阻抗先增加后下降; 后续时效处理使样品中残余应力下降、第二相重新分布, 从而提高了表面腐蚀产物对基体的保护作用, 改善了超细晶镁合金的耐蚀性。
超细晶
等通道转角挤压
微区电化学
ZK60 magnesium alloy
ultra-fine grain (UFG)
equal channel-angular pressing(ECAP)
local electrochemistry
Abstract
Ultra-fine grained ZK60 Mg alloy was obtained by equal channel-angular pressing (ECAP), and the distribution of second phases was further adjusted by post-aging. Subsequently, localized electrochemical impedance spectroscopy (LEIS) and constant immersion test were used to analyze the influence of grain refinement and finer second-phase particles on the corrosion behavior of ZK60 Mg alloy. The results showed that the mass loss rate of the solution-treated ZK60 Mg alloy in 3.5%NaCl increased with ECAP passes, and the impedance first increased and then decreased with immersion time. Corrosion behavior of ultra fine-grained ZK60 Mg alloy was improved by post-ECAP aging, due to the better protective ability of corrosion product after the relief of internal stress and the redistribution of second phase.
中图分类号 TG174.4 TG146.2 DOI 10.11973/fsyfh-201511005
所属栏目 试验研究
基金项目 江苏省自然科学基金(BK20131373)
收稿日期 2014/11/13
修改稿日期
网络出版日期
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备注江静华(1971-), 教授, 博士, 从事材料腐蚀与防护研究,
引用该论文: LI Xin,JIANG Jing-hua,ZHAO Yong-hao,WEN Dao-jing. Effect of Grain Ultrafining on Corrosion Behavior of ZK60 Mg Alloy[J]. Corrosion & Protection, 2015, 36(11): 1030
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【8】LUO W,XU Y,WANG Q,et al. Effect of grain size on corrosion of nanocrystalline copper in NaOH solution[J]. Corrosion Science,2010,52:3509-3513.
【9】MISHRA R,BALASUBRAMANIAM R. Effect of nanocrystalline grain size on the electrochemical and corrosion behavior of nickel[J]. Corrosion Science,2004,46:3019-3029.
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【11】LIU L,LI Y,WANG F. Electrochemical corrosion behavior of nanocrystalline materials-a review[J]. Journal of Materials Science & Technology,2010,26:1-14.
【12】何运斌,潘清林,覃银江,等. 等通道角挤压制备细晶ZK60镁合金的组织与力学性能[J]. 中国有色金属学报,2010,20(12):2274-2282.
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【14】HUANG V M,WU S L,ORAZEM M E,et al. Local electrochemical impedance spectroscopy:A review and some recent developments[J]. Electrochimica Acta,2011,56:8048-8057.
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【16】LI M,CHENG Y. Corrosion of the stressed pipe steel in carbonate-bicarbonate solution studied by scanning localized electrochemical impedance spectroscopy[J]. Electrochimica Acta,2008,53:2831-2836.
【17】ZHONG C,TANG X,CHENG Y. Corrosion of steel under the defected coating studied by localized electrochemical impedance spectroscopy[J]. Electrochimica Acta,2008,53:4740-4747.
【18】KAINER K U,KAISER F. Magnesium alloys and technology[M]. Bolin:Wiley-VCH Veriag Gmbh Co,KGAA,2003.
【19】董超芳,生海,安英辉,等. Cl-作用下2A12铝合金在大气环境中腐蚀初期的微区电化学行为[J]. 北京科技大学学报,2009,31(7):878-883.
【20】PARK J Y,LEE D N. Deformation and annealing textures of equal-channel angular pressed 1050 Al alloy strips[J]. Materials Science and Engineering:A,2008,497:395-407.
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