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| Influence of Oxide Morphologies on Galvanizability of Third Generation Automotive Steel |
| She-ming JIANG1,Shi-jie FENG1,2,Xun-hua YUAN1,Yuan-peng LI1,Zhen-hua LI2,Qi-fu ZHANG1 |
1. National Engineering Laboratory of Advanced Coating Technology for Metal Materials, Central Iron and Steel Research Institute, Beijing 100081, China
2. Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China |
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Abstract Focusing on improving the galvanizability of the third generation automotive steel, the effect of surface oxide morphologies on the galvanizability was studied. The results show that the surface oxide types of sample steels by X-ray photoelectron spectroscopy (XPS) analysis after annealing in different conditions are the same. Only MnO, MnO2 and Cr2O3 were detected and no complex oxide exists on the surface. Morphologies of surface oxides can greatly influence the galvanizability of the third generation automotive steel. Nodule-like oxide surface can contribute to better wettability and inhibition layer than vitreous film-like oxide surface. Galvanized panels of nodule-like oxide 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 galvanized panels of nodule-like oxide surface steels is 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.
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Received: 11 September 2013
Published: 13 November 2014
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| Fund:��973�� National Basic Research Project of China |
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Corresponding Authors:
Shi-Jie FENG
E-mail: fengshistars@126.com
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2014, Vol. 21 
