Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 390, Issue 1-2, Pages 437-443Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2004.08.062
Keywords
aluminizing; carbon steel; dissolution; effect of carbon; intermetallic layer; diffusion
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Hot dip aluminizing of carbon steels with different carbon concentration ranging 0.2-1.1 wt.% was carried out in a molten Al-9.08 wt.% Si-0.98 wt.% Fe alloy at 660degreesC. The steel specimens lost weight as a result of dissolution into the melt, and an intermetallic layer was formed on the surface of them. The specimens showed varied dissolution rates depending on carbon concentration. The specimen with the highest carbon content exhibited the slowest dissolution rate. The thickness of the intermetallic layer increased with dipping time following a parabolic relationship. The growth rate of the layer decreased with increase of the carbon content. A diffusion mechanism to control the dissolution of the carbon steel into the molten aluminum alloy was suggested, and the effect of carbon content on the dissolution of the steel substrate into the melt was discussed in connection with the proposed diffusion mechanism and microstructural observations. (C) 2004 Elsevier B.V. All rights reserved.
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