Journal
SURFACE & COATINGS TECHNOLOGY
Volume 206, Issue 21, Pages 4329-4334Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2012.01.048
Keywords
Galvalume; Microstructure; Intermetallics; Cu; Diffusion path
Funding
- National Natural Science Foundation of China [50971110, 50971111]
- Qinlan project
- Hunan Provincial Innovation Foundation for Postgraduate [CX2010B261]
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The coating microstructures and thicknesses of the iron panels galvanized in galvalume baths containing 0.0, 0.1, 0.5 and 1.0 wt.%Cu for 10 s, 30 s, 60 s, 180 s, 300 s and 600 s have been studied detailedly. The results indicate that Cu can effectively control the Fe-Al reactivity by the synergistic effect with Si. The addition of Cu makes Si be enriched in the reaction region during the hot-dipping. It promotes the formation of the tau(5) phase and hinders the growth of the Fe2Al5 phase. The diffusion path model was introduced to studying the effects of Cu and Si in the present study. The addition of 0.5-1.0 wt.%Cu in galvalume bath forms a stable diffusion path, iron substrate/Fe2Al5/FeAl3/tau(5)/overlay. The violent reaction between the iron substrate and the Al-Zn liquid is under control by the compact intermetallic layer, and it decreases the thickness of the intermetallic layer. (C) 2012 Elsevier B.V. All rights reserved.
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