Study on growth factors of intermetallic layer within hot-dipped 25% Al-Zn alloy coating on steel |
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Authors: | Yan Li Ying Ma Baorong Hou Falun Feng Xujun Wei |
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Affiliation: | (1) Institute of Oceanology, Chinese Academy of Sciences, 266071 Qingdao, P.R. China;(2) Northeastern University, 110006 Shenyang, P.R. China |
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Abstract: | 25% A1-Zn alloy coating performs better than hot dip galvanized coating and 55% A1-Zn-Si coating with regard to general seawater
corrosion protection. This study deals with the interfacial intermetallic layer’s growth, which affects considerably the corrosion
resistance and mechanical properties of 25%A1-Zn alloy coatings, by means of three-factor quadratic regressive orthogonal
experiments. The regression equation shows that the intermetallic layer thickness decreases rapidly with increasing content
of Si added to the Zn-Al alloy bath, increases with rise in bath temperature and prolonging dip time. The most effective factor
that determined the thickness of intermetallic layer was the amount of Si added to Zn-Al alloy bath, while the effect of bath
temperature and dip time on the thickness of intermetallic layer were not very obvious. |
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Keywords: | Galvanization by hot-dipping intermetallic layer 25% Al-Zn alloy coating |
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