Synergistic inhibition effect of sodium silicate and acrylamide on the corrosion of carbon steel in a high-concentration KCl solution

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• 作者：Jingmao Zhao ; Manlu Zhang ; Zhiwei Tie
• 关键词：KCl solution ; Sodium silicate ; Acrylamide ; synergistic inhibition effect ; Corrosion inhibitor
• 刊名：Chemical Research in Chinese Universities
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：33
• 期：1
• 页码：100-106
• 全文大小：
• 刊物主题：Chemistry/Food Science, general; Analytical Chemistry; Inorganic Chemistry; Organic Chemistry; Physical Chemistry;
• 出版者：Jilin University and The Editorial Department of Chemical Research in Chinese Universities
• ISSN：2210-3171
• 卷排序：33

文摘

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, elec-trochemical 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 per-formance. Moreover, the steel gains mass instead of losing mass in the presence of 0.5% Na₂SiO₃ and 0.5% AM, in-dicating 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.