Influence of Oxide Morphologies on the Galvanizability of the Third Generation Automotive Steel

Abstract:

Focusing on improving the galvanizability of the third generation automotive steel, the effect of surface oxides morphologies on the galvanizability was studied. The results show that the surface oxide types of sample steels by XPS analysis after annealing in different conditions are the same, only MnO and Cr₂O₃ were detected and no complex oxides exist on the surface. Morphologies of surface oxides can greatly influence the galvanizability of the third generation automotive steel, nodule-like oxides surface can contribute to better wettability and inhibition layer than vitreous film-like oxides surface. Galvanizing panels of nodule-like oxides surface steels only show pinhole-sized bare spots, while panels galvanized from vitreous film-like oxide surface steels reveal larger areas of bare spots and uncoated areas. Inhibition layer observed in galvanizing panels of nodule-like oxides surface steels are compact but not homogeneous, some inhibition layer grains are fine, and others are coarse. While the inhibition layer grains of panels galvanized from vitreous film-like oxide surface steels have a non-compact morphology with some particularly fine equiaxed crystals which developed deficiently.

• Periodical: Advanced Materials Research (Volumes 887-888)
• Pages: 233-239
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.887-888.233
• Online since: February 2014
• Authors: She Ming Jiang, Shi Jie Feng, Zhen Hua Li, Qi Fu Zhang
• Keywords: Galvanizability, Galvanizing, Oxide Morphologies, Third Generation Automotive Steel

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