Minimizing the creation of spent pickling liquors in a pickling process with high-concentration hydrochloric acid solutions: Mechanism and evaluation method

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• 作者：Bing Tang ; ^{renytang@163.com} ; Wen Su ; Jing Wang ; Fenglian Fu ; Guojun Yu ; Jianyin Zhang
• 关键词：Spent pickling liquor ; Cleaner production ; Surface cleaning ; Synergistic effect ; Corrosion inhibition ; Industrial pickling
• 刊名：Journal of Environmental Management
• 出版年：2012
• 出版时间：15 May 2012
• 年：2012
• 卷：98
• 期：Complete
• 页码：147-154
• 全文大小：667 K

文摘

The purpose of this investigation is to propose a strategy for minimizing the creation of spent pickling liquors through the synergistic corrosion inhibition of OP-10 and potassium iodide, thus facilitating a cleaner production process for acid pickling of metals with a high-concentration solution (6.0 mol/l) of hydrochloric acid. Results obtained with the methods of weight loss and electrochemical polarization showed that adding KI and OP-10 could enhance the energy barrier of the corrosion reaction and improved the corrosion inhibition for mild steel in high concentration of HCl solutions. A synergistic effect was identified when KI and OP-10 were present in suitable proportions. The results of the electrochemical experiments and scanning electron microscope (SEM) observations showed that the complex inhibitor was a mixed-type inhibitor and it formed a compact film on the metal surface, thus providing an effective protection for the metal in the aggressive solutions, which significantly minimized the creation of spent pickling liquors. A simple and convenient method was also proposed for the quantificational evaluation of the inhibition degree in the creation of spent pickling liquors.