Chemical Research in Chinese Universities ›› 2017, Vol. 33 ›› Issue (1): 100-106.doi: 10.1007/s40242-017-6286-8

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Synergistic Inhibition Effect of Sodium Silicate and Acrylamide on the Corrosion of Carbon Steel in a High-concentration KCl Solution

ZHAO Jingmao1,2, ZHANG Manlu1, TIE Zhiwei1   

  1. 1. College of Material Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China;
    2. Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology, Beijing 100029, P. R. China
  • Received:2016-07-05 Revised:2016-09-20 Online:2017-02-01 Published:2016-12-05
  • Contact: ZHAO Jingmao,E-mail:zhaojm1@mail.buct.edu.cn E-mail:zhaojm1@mail.buct.edu.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China(No.51471021).

Abstract:

The corrosion inhibition performances of sodium silicate(Na2SiO3) and acrylamide(AM) for Q235 carbon steel in a high-concentration KCl solution(25%, mass fraction) were investigated via static mass loss method, electrochemical measurements, scanning electron microscopy(SEM), X-ray photoelectron spectroscopy(XPS) and Auger electron spectroscopy(AES). AM shows poor inhibition performance, while Na2SiO3 exhibits a better inhibition performance. Moreover, the steel gains mass instead of losing mass in the presence of 0.5% Na2SiO3 and 0.5% AM, indicating that the corrosion is completely inhibited. SEM analysis indicates that a compact protective film is formed on the steel surface by the combined use of inhibitors. Our results demonstrate that Na2SiO3 and AM could have a synergistic effect on steel corrosion in high concentrations of KCl. The synergistic inhibition mechanism is further conjectured by the XPS and AES analysis.

Key words: KCl solution, Sodium silicate, Acrylamide, synergistic inhibition effect, Corrosion inhibitor