Details

Autor(en) / Beteiligte

• Tang, Bing
• Su, Wen
• Wang, Jing
• Fu, Fenglian
• Yu, Guojun
• Zhang, Jianyin

Titel

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

Ist Teil von

• Journal of environmental management, 2012-05, Vol.98, p.147-154

Ort / Verlag

Kidlington: Elsevier Ltd

Erscheinungsjahr

2012

Quelle

MEDLINE

Beschreibungen/Notizen

• 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 (6.0mol/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. ► A strategy was proposed to minimize the creation of spent pickling liquors. ► It was confirmed that the key factor was a compact film formed on the metal surface. ► We proposed a simple method for quantitative evaluation of the minimization effect.