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| Influence of Nano SiO2 on Structure and Corrosion Resistance of Phosphate Coating on Surface of Mild Steel |
| WANG Yi, SHENG Minqi, ZHONG Qingdong, ZHOU Qiongyu, WU Hongyan, LI Zhenhua |
| School of Material Science and Engineering, Shanghai University, Shanghai 200072 |
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Cite this article:
WANG Yi SHENG Minqi ZHONG Qingdong ZHOU Qiongyu WU Hongyan LI Zhenhua. Influence of Nano SiO2 on Structure and Corrosion Resistance of Phosphate Coating on Surface of Mild Steel. Chin J Mater Res, 2011, 25(4): 362-368.
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Abstract Under the low temperature conditions, phosphate coating on the surface of mild steel by the addition of nano-SiO2 in phosphating solution was prepared in this paper. The influence of nano-SiO2 on structure and performance of phosphate coating was investigated by SEM, XRD, EDS, thickness, surface roughness and corrosion electrochemical testing. The results show that although nano-SiO2 is not main component of phosphate coating, but the coating thickness decreases with increasing the concentration of nano-SiO2, nano-SiO2 can reduce the crystal size of coating and increase the density and corrosion resistance of coating. When the nano-SiO2 concentration is 2 g/L, the best corrosion resistance of phosphate coating is obtained in 3.5% NaCl solution. The corrosion current of phosphating sample was 0.231 μA/cm2 in 5% NaCl solution.
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Received: 22 December 2010
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| Fund: Supported by National Science Foundation of China Nos.50571059 & 50615024, Program for New Century Excellent Talents in University No.NCET-07-0536, Innovative Research Team in University No.RT0739. |
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