title: Minimizing the creation of spent pickling liquors in a pickling process with high-concentration hydrochloric acid solutions: mechanism and evaluation method.
abstract: 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.
authors.affiliation: Faculty of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China. renytang@163.com
authors.forename: Bing
authors.initials: B
authors.lastname: Tang
authors.forename: Wen
authors.initials: W
authors.lastname: Su
authors.forename: Jing
authors.initials: J
authors.lastname: Wang
authors.forename: Fenglian
authors.initials: F
authors.lastname: Fu
authors.forename: Guojun
authors.initials: G
authors.lastname: Yu
authors.forename: Jianyin
authors.initials: J
authors.lastname: Zhang
mesh_terms: D005525:Food-Processing Industry; D006851:Hydrochloric Acid / Q000737:chemistry*; D007220:Industrial Waste / Q000517:prevention & control*; D007700:Kinetics; D008855:Microscopy, Electron, Scanning; D011092:Polyethylene Glycols / Q000737:chemistry*; D011193:Potassium Iodide / Q000737:chemistry*; D013232:Steel / Q000737:chemistry; D013816:Thermodynamics
chemical_list: D007220:Industrial Waste; D013232:Steel; D011193:Potassium Iodide; D011092:Polyethylene Glycols; C061977:polyethylene glycol alkylphenyl ether; D006851:Hydrochloric Acid