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Relationship Between pH and Electrochemical Corrosion Behavior of Thermal-Sprayed Ni-Al-Coated Q235 Steel in Simulated Soil Solutions

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Abstract

Electrochemical corrosion behavior of a thermal-sprayed Ni-Al-coated Q235 steel was investigated in the simulated soil solutions at different pH values using measurements of potentiodynamic polarization curves and electrochemical impedance spectroscopy as well as surface analyses including x-ray diffraction analysis, scanning electron microscope equipped with an energy-dispersive x-ray spectroscopy and x-ray photoelectron spectroscopy. The results showed that the corrosion resistance of the Ni-Al-coated Q235 steel was dependent on the pH of the test solution. From pH = 3.53 to pH = 4.79, the corrosion resistance of the coated steel increased rapidly. In the pH range from 4.79 to 12.26, the corrosion resistance exhibited no significant change. At pH 13.25, the corrosion resistance of the sample was found to decrease. The calculated corrosion rate of Ni-Al-coated Q235 steel was lower than that of the uncoated Q235 steel and galvanized steel in all the test solutions. Over a wide range of pH values, the Ni-Al-coated Q235 steel exhibited extremely good corrosion resistance. The experimental data together with the potential-pH diagrams provided a basis for a detailed discussion of the related corrosion mechanisms of the coated steel.

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Acknowledgments

This work was jointly supported by the Science and Technology Foundation of China (51371174), the Science Project of State Grid Corporation of China under Grant KG12K16004, and the Innovation Fund of IMR, CAS.

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Authors and Affiliations

  1. CAS Key Laboratory of Nuclear Materials and Safety Assessment, Liaoning Key Laboratory for Safety and Assessment Technique of Nuclear Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, People’s Republic of China

    Wei Wei, Xin-qiang Wu & Wei Ke

  2. University of Chinese Academy of Sciences, 19 A Yuquan Road, Beijing, 100049, People’s Republic of China

    Wei Wei

  3. Hunan Electric Power Corporation Research Institute, Changsha, 410007, People’s Republic of China

    Song Xu, Bing Feng & Bo-tao Hu

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  1. Wei Wei
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  2. Xin-qiang Wu
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  3. Wei Ke
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  4. Song Xu
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  5. Bing Feng
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Correspondence to Xin-qiang Wu.

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Wei, W., Wu, Xq., Ke, W. et al. Relationship Between pH and Electrochemical Corrosion Behavior of Thermal-Sprayed Ni-Al-Coated Q235 Steel in Simulated Soil Solutions. J. of Materi Eng and Perform 26, 4340–4348 (2017). https://doi.org/10.1007/s11665-017-2906-1

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  • DOI: https://doi.org/10.1007/s11665-017-2906-1

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