The Hybrid Effect of Al and Cr in Zinc Bath on Galvanizing Coatings

Abstract:

The hybrid effect of Al and Cr in zinc bath on galvanizing coatings were studied by means of scanning electron microscope (SEM) and energy dispersive X-ray spectroscope (EDS), coupled with hot-dip galvanizing experiments. A new phase T1 was found in the coating, and the ζ phase was absent when hot-dip galvanizing at 480 °C. When Cr added zinc bath were alloyed with 0.1 wt.% Al, coating was composed of δ, ζ, η and T1 phases; when Cr added zinc bath were alloyed with 0.2 wt.% Al, δ phase layer became thinner, ζ changed from even layer to blocky crystals, and diffuse-Δ coexisted with the ζ phase. The morphology evolution of galvanizing coating was analyzed and the hybrid effect of Al and Cr were discussed with diffusion path theory.

• Periodical: Advanced Materials Research (Volumes 538-541)
• Pages: 306-310
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.538-541.306
• Online since: June 2012
• Authors: Ya Liu, Xu Ping Su, Jian Hua Wang, Zhi Li, Hao Tu
• Keywords: Al and Cr, Diffusion Path, Galvanizing, Zinc Alloy

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