不同Sn含量对Al-Zn-Ga-Si-Sn阳极性能的影响
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摘要
为了改善Al-Zn-Ga-Si-Sn低电位牺牲阳极的性能,通过调节Sn元素含量提高牺牲阳极的表面活性和电流效率,制备了5种不同Sn含量的牺牲阳极材料,采用牺牲阳极电化学性能测试方法、极化曲线及电化学阻抗谱测量、表观形貌分析等手段分析了Sn元素对于低电位铝合金牺牲阳极电化学性能的影响。结果表明:Sn可以有效地提高阳极表面的活性,并且破坏表面钝化膜降低表面自由能,使工作电位正移,提高阳极电流效率,改善阳极的溶解形貌。
In order to improve the performance of the Al-Zn-Ga-Si-Sn low voltage sacrificial anode,the surface activity and current efficiency of the sacrificial anode were improved by regulating the Sn contents to prepared five kinds of sacrificial anode materials with different Sn contents. The effects of Sn on the performance of low voltage aluminium alloy sacrificial anodes were analyzed by sacrificial anode electrochemical performance test method,polarization curve and electrochemical impedance spectroscopy measurement. Results showed that the Sn could effectively improve the activity of the anode surface and destroy the surface passivation film for reducing the surface free energy,which made the working potential to shift positively,increased the anode current efficiency and improved the dissolution morphology of the anode.
In order to improve the performance of the Al-Zn-Ga-Si-Sn low voltage sacrificial anode,the surface activity and current efficiency of the sacrificial anode were improved by regulating the Sn contents to prepared five kinds of sacrificial anode materials with different Sn contents. The effects of Sn on the performance of low voltage aluminium alloy sacrificial anodes were analyzed by sacrificial anode electrochemical performance test method,polarization curve and electrochemical impedance spectroscopy measurement. Results showed that the Sn could effectively improve the activity of the anode surface and destroy the surface passivation film for reducing the surface free energy,which made the working potential to shift positively,increased the anode current efficiency and improved the dissolution morphology of the anode.
引文
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[16]GURRAPPA I.The surface free energy and anode efficiency of aluminium alloys[J].Corros Prev Contr,1993,43:111-114.
[2]BATT C,ROBINSON M J.Cathodic protection requirements for high strength steel in sea water assessed by potentiostatic weight loss measurements[J].British Corrosion Journal,2013,37(1):31-36.
[3]LEMIEUX E,KEITH E,HOGAN E A.Performance Evaluation of Low Voltage Anodes for Cathodic Protection:Corrosion 2002[C].Denver:NACE International,2002:1-11.
[4]宋曰海,郭忠诚,樊爱民,等.牺牲阳极材料的研究现状[J].腐蚀科学与防护技术,2004,16(1):24-28.
[5]李凯,马力,闫永贵,等.低驱动电位牺牲阳极的研究[J].材料保护,2010,43(4):95-97.
[6]李威力,闫永贵,陈光,等.合金元素对铝基牺牲阳极性能的影响[J].中国腐蚀与防护学报,2012,32(2):127-132.
[7]GURRAPPA I,KARNIK J A.Effect on tin-activated aluminium alloy anodes of the addition of bismuth[J].Anodic Protection,1994,41(5):117-121.
[8]BARBUCCI A,CERISOLA G,BRUZZONE G,et al.Activation of aluminium anodes by the presence of intermetallic compounds[J].Electrochimica Acta,1997,42(15):2 369-2 380.
[9]马力,曾红杰,闫永贵,等.Ga含量对Al-Ga牺牲阳极电化学性能的影响[J].腐蚀科学与防护技术,2009,21(2):125-127.
[10]PAUTASSO J P,GUYADER L,DEBOUT V.Low voltage cathodic protection for high strength steels:part 1-definition of a new aluminium galvanic angle material:Corrosion 1998[C].San Diego:NACE International,1996:1-27
[11]蔡超,李劲风,郑子樵,等.电化学阻抗普研究8090 AlLi合金的剥蚀敏感性[J].中国有色金属学报,2004,14(4):742-748.
[12]曹楚南,张鉴清.电化学阻抗谱导论[M].北京:科学出版社,2004:162-163.
[13]LI Z,XUE Q,YU Y,et al.The Electrochemical Behavior of Al Alloys Containing Tin and Gallium in Alkaline Electrolytes[J].Acta Physico-Chimica Sinica,1999,15(4):381-384.
[14]梁叔全,官迪凯,张勇,等.铝合金阳极性能影响因素的研究进展[J].热加工工艺,2009,38(16):3-7.
[15]张信义,火时中,王元玺.合金元素对Al-Zn-In-Ga合金牺牲阳极性能的影响[J].材料保护,1996,29(2):3-5.
[16]GURRAPPA I.The surface free energy and anode efficiency of aluminium alloys[J].Corros Prev Contr,1993,43:111-114.