采用CHI660C电化学工作站测试了Al-5Zn-0.5Bi和Al-5Zn-0.5Bi-0.06Sn合金在3%NaCl溶液中的极化曲线和电化学阻抗谱(EIS),考察了合金的电化学性能.结果表明,Al-5Zn-0.5Bi中添加0.06%的Sn元素后,自腐蚀电位Ecorr升高0.017V,耐腐蚀性能有所增强.等效电路RS(RPC)(QRD(RaL))较好地拟合了Al-5Zn-0.5Bi系合金在3%NaCl溶液中的EIS谱,基本反映了该铝合金的电化学腐蚀过程.随着合金在3%NaCl溶液中浸泡时间的延长,腐蚀产物膜增厚并部分脱落,主要形成点蚀.另外,腐蚀产物更容易在含Sn合金氧化膜缺陷处形成,阻碍了腐蚀介质中Cl-向其内部扩散,从而减缓了点蚀和自腐蚀速度,有助于提高该合金材料作为牺牲阳极的电流效率.
参考文献
[1] | Reboul M C;Gimenez P H;Rameau J J .[J].Corrosion,1984,40:366-371. |
[2] | Norris JC.;Alexander MR.;Blomfield CJ.;Grundwell RF.;Scantlebury JD. .Quantitative analysis of indium and iron at the surface of a commercial Al-Zn-In sacrificial anode[J].Surface and Interface Analysis: SIA: An International Journal Devoted to the Development and Application of Techniques for the Analysis of Surfaces, Interfaces and Thin Films,2000(1):170-175. |
[3] | D.O. Flamini;S.B. Saidman;J.B. Bessone .Aluminium activation produced by gallium[J].Corrosion Science: The Journal on Environmental Degradation of Materials and its Control,2006(6):1413-1425. |
[4] | 龙萍,李庆芬.不同温度下锡对铝合金阳极电化学性能的影响[J].材料保护,2005(10):11-14. |
[5] | 齐公台,郭稚弧,林汉同,魏伯康.地震数据结构特征与油气预测[J].中国海上油气,2000(06):417-421. |
[6] | 朱承飞,徐峰,魏无际,丁毅,王宁.微量锑和锡对铝基牺牲阳极材料性能的影响[J].中国有色金属学报,2005(04):631-636. |
[7] | S.Gudic;J.Radosevic;D.Kropan-Lisica;M.Kliskic .Anodic film growth on aluminium and La-Sn alloys in borate buffer solutions[J].Electrochimica Acta,2001(16):2515-2526. |
[8] | S. Gudic;J. Radosevic;M. Kliskic .Study of passivation of Al and Al-Sn alloys in borate buffer solutions using electrochemical impedance spectroscopy[J].Electrochimica Acta,2002(18):3009-3016. |
[9] | 胡会利,李宁,程瑾宁,王雅芬.达克罗涂层在海水中的腐蚀电化学阻抗谱行为[J].中国腐蚀与防护学报,2007(04):197-201. |
[10] | 曹楚南.腐蚀电化学原理[M].北京:化学工业出版社,2004:185-186. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%