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Gadadhar Sahoo, Kilaru Ravi, Srikanti Srikanth, and Panduranga Saravanan:
Microstructural evolution during batch galvanizing of steel
Batch galvanizing, intermetallic layer, morphology, Sandelin effect
Silicon, which makes steel reactive, used to be a problem for galvanizers. For typical low-carbon steel containing little silicon, various intermetallic layers composed of G, d, z and h are developed in accordance with a Fe-Zn binary phase diagram. The alloy layers are compact and continuous. However, the presence of silicon in semi-killed and killed steels leads to a rapid growth of the alloy layer producing a coating of excessive thickness, discontinuous intermetallic layer and poor adherence. As the problem was governed by silicon in steel, the effect of silicon on galvanizing was categorized as Sandelin effect. In the present work, to offset the Sandelin effect and surface roughness, the bath composition used in conventional hot-dip batch galvanizing was varied by adding aluminum (up to 0.02 %) along with changes in dipping time and temperature.
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