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Study on process of hot-dip anodic aluminum alloy coating on steel structure
Pages: 257-261
Year: Issue:  5
Journal: Electroplating & Finishing

Keyword:  steel structurehot-dip aluminizingalloyanodic coatingcorrosion protectionpolarity reversalmicrostructure;
Abstract: 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.
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