pH对Al-Mg合金电化学腐蚀行为的影响
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- 英文论文题名：Effect of pH Values on Corrosion Behavior of Al-alloy
- 论文作者：孔小东 ; 汪俊英
- 英文论文作者：KONG Xiao-dong ; WANG Jun-ying ; Chemistry and Material Department ; Naval University of Engineering ; Unit 92602
- 年：2014
- 作者机构：海军工程大学理学院化学与材料系;92602部队;
- 论文关键词：铝合金 ; 微观组织 ; 海水腐蚀 ; pH
- 英文论文关键词：Al-alloy ; microstructure ; seawater corrosion ; pH value
- 会议召开时间：2014-07-28
- 会议录名称：第十八届全国缓蚀剂学术讨论会论文集
- 语种：中文
- 分类号：TG174.36
- 学会代码：ZGHA
- 会议名称：第十八届全国缓蚀剂学术讨论及应用技术经验交流会
- 会议地点：中国四川成都
- 主办单位：中国腐蚀与防护学会缓蚀剂专业委员会
- 学会名称：中国腐蚀与防护学会缓蚀剂专业委员会
- 页数：5
- 文件大小：3496k
- 原文格式：O
- 会议级别：全国
摘要
针对铝合金在海水介质中的腐蚀问题,通过电化学试验,结合微观分析,探讨介质pH值对铝合金腐蚀特性的影响。结果表明,随着溶液pH降低,铝合金的自腐蚀电位正向移动;表面试样的腐蚀速度小于截面试样;试样的钝化倾向降低;横截面试样的耐点蚀性能优于表面试样和纵截面试样,特别是纵截面试样点蚀倾向性最大;铝合金中第二相含量相对少,导致合金腐蚀行为更倾向于均匀腐蚀。
The corrosion behavior was analyzed for Al-alloy by electrochemical test and microstructure measurement,because of the corrosive problem of two al-alloys in sea environment.In 3%NaCl solution,the corrosion potentials move to positive with drop of pH,the corrosion velocity of surface specimen is more than that of cross-sectional sample;and the pitting susceptibility of surface sample is less than that of cross-sectional sample;the corrosion of Al-alloy maybe more present general corrosion because of less second phases in alloy.
The corrosion behavior was analyzed for Al-alloy by electrochemical test and microstructure measurement,because of the corrosive problem of two al-alloys in sea environment.In 3%NaCl solution,the corrosion potentials move to positive with drop of pH,the corrosion velocity of surface specimen is more than that of cross-sectional sample;and the pitting susceptibility of surface sample is less than that of cross-sectional sample;the corrosion of Al-alloy maybe more present general corrosion because of less second phases in alloy.
引文
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[2]MORCILLO M,CHICO B,MARIACA L,et al.Salinity inrnarine atmospheric corrosion its dependence on the wind regime existing in the site[J].Corros Sci,2000,42:91-104.
[3]王洪仁,吴建华,王均涛,等.5083铝合金在海水中的腐蚀电化学行为及活性氯影响研究[J].电化学,2003,9(1):60-64.
[4]XU NX,ZHAO LY,DING CH,et al.Laboratory observation of dew formation at an early stage of atmospheric corrosion of metals[J].Corros Sci,2002,44:163-170.
[5]GRIGORIS E K,STEFANOS M S,ELENI G P.A study on pitting behavior of AA2024/SiCp composites using the double cycle polarization technique[J].Corrosion Science,1999,41:185.
[6]王黎琳.孔蚀和缝隙腐蚀的电化学测定[J].表面技术,1984,04:47-48.
[7]汪俊英.铝合金在模拟海水环境中的腐蚀行为研究[D].武汉:海军工程大学硕士学位论文,2009:23-25
[8]吴荫顺.腐蚀试验方法与防腐蚀检测技术[M].北京:化学工业出版社,1996:51-57.
[9]ZHAO X,ZUO Y,ZHAO J M,et al.A study on the self-sealing process of anodic films on aluminum by EIS[J].Surface&CoatingsTechnology,2006,200:6846-6853.
[10]杨志成,田志强,孔小东.Al-Mn-Mg合金在不同电解液中阳极氧化后的耐蚀性比较[J].材料保护,2008,41(6):70-71.
[11]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):83.
[12]马景灵,文九巴,焦孟旺.合金元素Mn对铝合金阳极组织与性能的影响[J].腐蚀与防护,2008,29(11):667-669.
[13]马景灵,文九巴,李光福.含Mn元素的铝合金牺牲阳极材料的研究[J].金属热处理,2008,33(8):57-60.