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The influence of dissolved ozone in a phosphate bath on phosphate coatings on carbon steel

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Abstract

The influence of dissolved ozone (O3) and its concentrations on the formation of phosphate coatings on carbon steel in phosphate bath, as well as the protective properties of phosphate coatings in a 5 wt% NaCl solution have been studied. The structure, surface morphologies, and phase compositions of the phosphate coating on the carbon steel substrate was investigated by SEM, XRD. It is shown that the phosphate coating became more dense with fewer microholes and an increasing concentration of ozone in phosphate bath in the range of 0.0 to 1.62 mg/L. The coating compositions were Zn3(PO4)2 · 4H2O (hopeite) and Zn2Fe(PO4)2 · 4H2O. Potentiodynamic polarization and immersion tests were used to evaluate the corrosion properties of the treated samples. The coating showed good corrosion resistance properties.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Shanghai University, Shanghai, 200072, PR China

    Minqi Sheng & Qindong Zhong

  2. Department of Chemistry, East China Normal University, Shanghai, 200062, PR China

    Yinyin Wei

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  1. Minqi Sheng
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  2. Yinyin Wei
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Correspondence to Minqi Sheng.

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Sheng, M., Wei, Y. & Zhong, Q. The influence of dissolved ozone in a phosphate bath on phosphate coatings on carbon steel. J Coat Technol Res 6, 543–547 (2009). https://doi.org/10.1007/s11998-008-9159-8

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