Prepartion of Al-Mn Alloy Coatings on Low Carbon Steel by Hot-Dip-Aluminizing

Abstract:

Low carbon steel were coated by hot-dipping into a molten bath containing Al-2 wt%Mn, Al-9wt%Mn, Al-13wt%Mn, respectively. The phase composition, morphology and the adhesion of the aluminide layer were characterized by XRD, SEM, EDAX, OM and scratch tester. The results show that the coating layers is mainly composed of Al, FeAl₃, Fe₂Al₅ and MnAl₆ phase. The coatings consists of two-layers structure, i.e., topcoat Al-Mn alloy layer and tongue-like intermetallic compound, and the coating layer is about 800 μm thick. The adhesion of the Al-Mn alloy coatings were characterized by Lc value and were found to be about ~30N. The adhesion gradually decrease with the increase of the Mn contents in alloy coatings.

• Periodical: Applied Mechanics and Materials (Volumes 117-119)
• Pages: 1121-1124
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.117-119.1121
• Online since: October 2011
• Authors: Xin Mei Li, Bing Liu, Xiao Feng Dong, Qing Yu, Qiao Yu Xu
• Keywords: Adhesion Strength, Al-Mn Alloy Coatings, Hot-Dip-Aluminizing, Microstructure

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