Abstract
Activation pretreatment with nickel acetate solution at various concentrations was performed prior to the phosphating step to enhance the corrosion resistance of carbon steel substrates. The activation solution was studied over various concentrations: 10, 50, and 100 g/L. The effects of these concentrations on surface characteristics and microstructural evolution of the coated samples were characterized by scanning electron microscopy and energy-dispersive spectroscopy. The electrochemical behavior was evaluated using potentiodynamic polarization curves, electrochemical impedance spectroscopy, and immersion test in a 3.5 pct NaCl solution. Significant increases in the nucleation sites and surface coverage of zinc phosphate coating were observed as the concentration of activation solution reached 50 g/L. The electrochemical analysis revealed that the activation treatment with 50 g/L nickel acetate solution significantly improved the protection ability of the zinc phosphate coating. The corrosion current density of activated phosphate coating with 50 g/L was reduced by 64.64 and 13.22 pct, compared to the coatings obtained with activation solutions of 10 and 100 g/L, respectively.
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The authors would like to acknowledge the support of Universiti Sains Malaysia for this research under post-doctoral fellow scheme (USM 1228/15). The authors also gratefully acknowledge the constant support provided by the staff in Universiti Sains Malaysia.
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Manuscript submitted July 4, 2016.
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Abdalla, K., Zuhailawati, H., Rahmat, A. et al. Characteristics of Zinc Phosphate Coating Activated by Different Concentrations of Nickel Acetate Solution. Metall Mater Trans A 48, 771–779 (2017). https://doi.org/10.1007/s11661-016-3876-x
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DOI: https://doi.org/10.1007/s11661-016-3876-x