在热浸镀纯铝的工艺条件下，通过在铝液中加入Zn、In、Sn等合金元素，制备了3种阳极性铝合金镀层：Al–5%Zn–0.02%In、Al–4%Zn–0.06%Sn及Al–5%Zn–0.06%Sn。使用光学显微镜、3.5% NaCl全浸腐蚀试验及电化学工作站检测了所得铝合金镀层的组织及性能，并与纯铝、纯锌及55%Al–43.4%Zn–1.6%Si镀层进行了对比。结果表明，镀层的最佳组成分别为Al–5%Zn–0.02%In和Al–(4%~5%)Zn–0.06%Sn。在3.5% NaCl溶液中，其耐蚀性优于55%Al–43.4%Zn–1.6%Si镀层，而腐蚀电位相当；在Cl–浓度为零时未发生铁铝极性逆转，镀层的显微组织与纯铝镀层相同。该热浸铝合金镀层的热浸镀工艺与热浸镀铝完全相同，使用热浸镀铝的设备及工艺即可实现工业生产。
Three kinds of anodic aluminum alloy coatings i.e. Al–5%Zn–0.02%In, Al–4%Zn–0.06%Sn, and Al–5%Zn–0.06%Sn were prepared under process conditions of hot-dip aluminizing by adding Zn and In or Sn alloying elements to aluminum bath. The microstructure and properties of the aluminum alloy coatings were studied by optical microscope, 3.5% NaCl immersion corrosion test, and electrochemical workstation, and compared with that of hot-dip pure aluminum, pure zinc, and 55%Al–43.4%Zn–1.6%Si coatings. The results indicated that the optimized alloy coating compositions are Al–5%Zn–0.02%In and Al–(4%-5%)Zn–0.06%Sn. They showed better corrosion resistance than a 55%Al–43.4%Zn–1.6%Si coating in 3.5% NaCl solution, while having a similar corrosion potential. When the concentration of Cl– is zero, the polarity reversal of iron and aluminum does not occur and the microstructures of the coatings are the same as pure aluminum coating. The hot-dip process of the aluminum alloy coatings is identical with that of the pure aluminum coating, which makes it possible to realize industrial production using the equipments and process of common hot-dip aluminizing.
参考文献
| [1] | MU?OZ A G;SAIDMAN S B;BESSONE J B .Corrosion of an Al-Zn-In alloy in chloride media[J].Corrosion Science,2002,44(10):2171-2182. |
| [2] | SCHRIEBER C F;MURRAY R W .Effect of hostile marine environments on the Al-Zn-In-Si sacrificial anode[J].Materials Performance,1988,27(07):70-77. |
| [3] | El Shayeb HA;El Abedin SZ;El Wahab FMA .Electrochemical behaviour of Al, Al-Sn, Al-Zn and Al-Zn-Sn alloys in chloride solutions containing indium ions[J].Journal of Applied Electrochemistry,1999(4):473-480. |
| [4] | SAIDMAN S B;BESSONE J B .Cathodic polarization characteristics and activation of aluminium in chloride solutions containing indium and zinc ions[J].Journal of Applied Electrochemistry,1997,27(06):731-737. |
| [5] | SAIDMAN S B;BESSONE J B .Anodic behaviour of indium in sodium chloride solutions[J].Electrochimica Acta,1991,36(14):2063-2067. |
| [6] | 李启中.金属电化学保护[M].北京:中国电力出版社,1997:45. |
| [7] | SALINAS D R;BESSONE J B .Electrochemical behavior of Al-5%Zn-0.1%Sn sacrificial anode in aggressive media：Influence of its alloying elements and the solidification structure[J].CORROSION,1991,47(09):665-674. |
| [8] | GUDI?S;RADO?EVI?J;KLI?KI?M .Study of passivation of Al and Al-Sn aloys in borate buffer solutions using electrochemical impedance spectroscopy[J].Electrochimica Acta,2002,47(18):3009-3016. |
| [9] | GUDI?S;RADO?EVI?J;KRPAN-LISICA D et al.Anodic film growth on aluminium and Al-Sn alloys in borate buffer solutions[J].Electrochimica Acta,2001,46(16):2515-2526. |
| [10] | 翟秀静,符岩,郎晓珍,吕久吉,谢基表.添加元素对铝基牺牲阳极的影响[J].有色金属,2006(01):42-45. |
| [11] | Salinas DR;Bessone JB;Garcia SG .Influence of alloying elements and microstructure on aluminium sacrificial anode performance: case of Al-Zn[J].Journal of Applied Electrochemistry,1999(9):1063-1071. |
| [12] | 吴益华 .合金元素在铝基牺牲阳极活化过程中的作用[J].中国腐蚀与防护学报,1989,9(02):113-120. |
| [13] | 刘邦津.钢材的热浸镀铝[M].北京:冶金工业出版社,1995:84. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%