Effects of zinc bath temperature on the coatings of hot-dip galvanizing

• Published in: Surface & coatings technology Vol. 202; no. 9; pp. 1785 - 1788
• Main Authors: Bicao, Peng, Jianhua, Wang, Xuping, Su, Zhi, Li, Fucheng, Yin
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.02.2008; Elsevier
• Subjects: Applied sciences; Coating morphology; Coating thickness; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Galvanizing temperature; Hot-dip galvanizing; Materials science; Metallic coatings; Metals. Metallurgy; Physics; Production techniques; Surface treatment; Surface treatments; Hot-dip galvanizing; Coating morphology; Coating thickness; Galvanizing temperature; Hot dip galvanizing; Temperature; Morphology; Surface treatments; Coatings; Layer thickness
• ISSN: 0257-8972; 1879-3347
• DOI: 10.1016/j.surfcoat.2007.07.044

The purpose of this work is to identify the influence of zinc bath temperature on the morphology and the thickness of hot-dip galvanizing coating. Hot-dip galvanizing samples were prepared at temperatures in the range of 450–530 °C in steps of 10 °C and at different immersing time. The samples were characterized by using scanning electron microscopy/energy dispersive X-ray analysis. When the galvanizing temperature ranges from 450 to 470 °C, the coating has a coherent and compact ζ layer on the top of a δ layer. ζ phase coexists with liquid zinc pocket around 480 °C. It was found that the coating thickness reaches maximum at 480 °C. When the temperature is above 500 °C, the coating changes to be primarily δ phase.