Preprint Concept Paper Version 2 This version is not peer-reviewed

Nano Metal Dioxide Incorporated Conversion Phosphate Coatings—A Chemical Approach

Version 1 : Received: 21 December 2016 / Approved: 21 December 2016 / Online: 21 December 2016 (11:09:49 CET)
Version 2 : Received: 23 December 2016 / Approved: 23 December 2016 / Online: 23 December 2016 (10:23:24 CET)

How to cite: Bagal, N.S.; Kathavate, V.S.; Deshpande, P.P. Nano Metal Dioxide Incorporated Conversion Phosphate Coatings—A Chemical Approach. Preprints 2016, 2016120111 (doi: 10.20944/preprints201612.0111.v2). Bagal, N.S.; Kathavate, V.S.; Deshpande, P.P. Nano Metal Dioxide Incorporated Conversion Phosphate Coatings—A Chemical Approach. Preprints 2016, 2016120111 (doi: 10.20944/preprints201612.0111.v2).

Abstract

The present study aims at deposition of zinc phosphate coatings with the incorporation of nano Titanium dioxide particles by chemical phosphating method. Zinc phosphate coatings were developed on low carbon steel by using nano TiO2 in the standard phosphating bath. The Coated low carbon steel samples were assessed for corrosion studies using electrochemical impedance spectroscopy and potentiodynamic polarisation techniques in 3.5% NaCl solution. Chemical composition of the coatings was analysed by energy dispersive X-ray spectroscopy (EDX). 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 incorporated chemical phosphate coated samples was found to be 3.5 mpy which was 4 times less than the bare uncoated low carbon steel (~14 mpy). Electrochemical impedance spectroscopy studies revels in the reduction of porosity in nano TiO2 phosphate coated samples. It was found that nano TiO2 particles in the phosphating solution yielded phosphate coatings of higher coating weight, greater surface coverage and enhanced corrosion resistance than the normal zinc phosphate coatings (developed using normal phosphating bath).

Subject Areas

chemical phosphate coating; EIS; nano TiO2; TAFEL

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