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Insight into the covalent grafting of organic films onto carbon steel surfaces for protection

  • Article
  • Physical Chemistry
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Chinese Science Bulletin

Abstract

The novel use of p-nitrophenyldiazonium tetrafluoroborate salt (GG salt) as a protectant that is electrochemically grafted onto carbon steel has been investigated in 0.05 mol L−1 H2SO4 and 5 wt% NaCl solutions using various corrosion monitoring techniques, such as electrochemical impedance spectroscopy, potentiodynamic polarisation, infrared spectra and scanning electron microscopy measurements. The electrochemical study reveals that this compound is a mixed inhibitor that predominantly controls the cathodic reaction. The surface-grafted film decreases the double-layer capacitance and obviously increases the charge transfer resistance relative to a bare carbon electrode. The values of inhibition effect remain nearly unchanged with an increase in temperature range of 298–318 K. The aryl diazonium is covalently bonded on the steel surface, causing a slight decrease in the apparent activation energy. Overall, the surface-grafted films exhibit excellent inhibition performance in acid and saline solutions within the studied temperature range.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (21103105), the Foundation for University Youth Teachers by the Shanghai Education Committee, and the Innovation Fund of Shanghai University (50334040).

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Correspondence to Sheng-Juan Huo.

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Huo, SJ., Chen, LH., Chu, CS. et al. Insight into the covalent grafting of organic films onto carbon steel surfaces for protection. Chin. Sci. Bull. 59, 971–980 (2014). https://doi.org/10.1007/s11434-014-0162-4

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  • DOI: https://doi.org/10.1007/s11434-014-0162-4

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