Adsorption and Inhibition Behavior of Calcium Lignosulfonate on Steel in NaCI + Ca(OH)(2) Solutions with Different pH Values

作者：Wang, Yishan; Zuo, Yu^*

来源：International Journal of Electrochemical Science, 2016, 11(8): 6976-6992.

DOI：10.20964/2016.08.49

• Carbon steel
• Corrosion
• Inhibitor
• CLS
• Microscopy infrared imaging
• XPS

Potentiodynamic polarization measurements, microscopy infrared imaging (Milt) and X-ray photoelectron spectroscopy (XPS) were used to study the adsorption and inhibition behavior of calcium lignosulfonate (CLS) on Q235 steel in 0.1 mol/L NaCI + Ca(OH)(2) solution (pH 7 similar to 12.5). In the solution of pH between 7 and 9.5, carbon steel was in active state. 0.001 mol/L CLS in the solution effectively inhibited both the cathodic and the anodic reactions. When the solution pH value increased to 9.5 similar to 10.5, passivation occurred and the main compositions of the passive film include Fe2O3, FeOOH, FeO and CaO/Ca(OH)(2). CLS promoted the passive state and raised the pitting corrosion potential E-b. In the solution of pH 7 similar to 9.5, an inhibition film formed by adsorption of the sulfonic acid group and benzene ring in CLS molecular on the surface. When the pH value increased to 10.5, a Ca-O-S co-adsorption structure could form between -SO3 group in CLS and the outer side layer of the passive film which is composed of CaO/Ca(OH)(2). The strong adsorption characteristic between -SO3 group in the adsorbed CLS on the surface and Ca2+ ions in solution may further improve the compactness of the adsorption film.

• 出版日期2016-8
• 单位北京化工大学