Nano-TiO2 Phosphate Conversion Coatings – A Chemical Approach

Electrochemical Energy Technology Pub Date : 2018-07-11 DOI:10.1515/eetech-2018-0006

N. S. Bagal, V. S. Kathavate, P. Deshpande

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引用次数: 6

Abstract

Abstract The present study aims at deposition of zinc phosphate coatings on low carbon steel with incorporated nano- TiO2 particles by chemical phosphating method. The coated low carbon steel samples were assessed in corrosion studies using electrochemical impedance spectroscopy and potentiodynamic polarization techniques (Tafel) in 3.5% NaCl solution. Morphology and chemical composition of the coatings were analyzed by scanning electron microscopy and energy dispersive X-ray spectroscopy in order to observe growth of coating. Significant variations in the coating weight, porosity and corrosion resistance were observed with the addition of nano- TiO2 in the phosphating bath. Corrosion rate of nano-TiO2 chemical phosphate coated samples was found to be 3.5 milli inches per year which was 3 times less than the normal phosphate-coated sample (8 mpy). Electrochemical impedance spectroscopy studies reveal reduction of porosity of nano-TiO2 phosphate coated samples. It was found that nano-TiO2 particles in the phosphating solution yielded uniform phosphate coatings of higher coating weight, fewer defects and enhanced corrosion resistance than the normal zinc phosphate coatings (developed using normal phosphating bath).

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纳米二氧化钛磷酸盐转化涂层-化学方法

摘要采用化学磷化法在低碳钢表面沉积纳米TiO2颗粒的磷酸锌涂层。采用电化学阻抗谱和动电位极化技术(Tafel)对涂层低碳钢样品在3.5% NaCl溶液中的腐蚀进行了研究。利用扫描电镜和x射线能谱分析了涂层的形貌和化学成分，观察了涂层的生长情况。在磷化液中加入纳米TiO2后，涂层的重量、孔隙率和耐腐蚀性都发生了显著变化。发现纳米二氧化钛化学磷酸盐包覆样品的腐蚀速率为每年3.5毫米英寸，比普通磷酸盐包覆样品(8英里/年)小3倍。电化学阻抗谱研究表明，纳米二氧化钛磷酸盐包被样品的孔隙率降低。结果表明，纳米tio2颗粒在磷化液中生成的磷化膜比普通磷化液制备的磷化锌膜具有更高的镀层重量、更少的缺陷和更强的耐腐蚀性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Electrochemical Energy Technology

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