1. Influence of Boron Concentration on the Corrosion Resistance of High Boron White Cast Iron to Liquid Zinc Bath
- Author
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Jian Dong Xing, Jianjun Zhang, Sheng Qiang Ma, Sheng Chao Ma, Guofeng Liu, and Da Wei Yi
- Subjects
Materials science ,Mechanical Engineering ,Fracture (mineralogy) ,Metallurgy ,chemistry.chemical_element ,Zinc ,engineering.material ,Spall ,Corrosion ,Matrix (chemical analysis) ,chemistry ,Mechanics of Materials ,Phase (matter) ,engineering ,General Materials Science ,Cast iron ,Boron - Abstract
The influence of boron concentration on corrosion resistance of high boron white cast iron dipped into a pure liquid zinc bath at 460°C was investigated. The results reveal that high boron white cast iron containing 3.5 wt.%B exhibits excellent corrosion resistance due to the dense continuous netlike or parallel Fe2B phase which hinders the Fe/Zn interface reaction. The corrosion rate decreases significantly when the boron concentration increases, but the corrosion rate declines slightly when the boron concentration exceeds 3.5wt.%. EDS results indicate the coarse and compact δ phase generated near the matrix and a large amount of massive and blocky phase occurred close to the liquid zinc. The corrosion process includes Fe/Zn interface reaction and the spalling and fracture of Fe2B. The failure of Fe2B is mainly caused by the microcrack of phase transformation.
- Published
- 2010
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