Synergistic Inhibition Effect of Potassium Sorbate and Zn2+ Ions on Corrosion of Q235 Steel in NaCl Solution

doi:10.11944/j.issn.1000-0518.2020.08.200013

Chinese Journal of Applied Chemistry ›› 2020, Vol. 37 ›› Issue (8): 960-968.DOI: 10.11944/j.issn.1000-0518.2020.08.200013

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Synergistic Inhibition Effect of Potassium Sorbate and Zn²⁺ Ions on Corrosion of Q235 Steel in NaCl Solution

WANG Fengping^*, HU Xiaoqiang, DING Yanwei, LI Jielan, ZHANG Wei

College of Chemistry and Chemical Engineering,Liaoning Normal University,Dalian,Liaoning 116029,China

Received:2020-01-12 Published:2020-08-01 Online:2020-08-07
Contact: WANG Fengping, professor; E-mail:wang_fp@sohu.com; Research interests:metal corrosion and protection
Supported by:
Technology Research Program of Liaoning Provincial Department of Education(No.LF201783609)

Abstract

Abstract: The synergistic inhibition effect of potassium sorbate (PS) and Zn²⁺ ions on the corrosion of Q235 steel in 0.5 mol/L NaCl solution was studied by weight loss method, electrochemical method, X-ray photoelectron spectroscopy (XPS) and scanning electronic microscopy (SEM). The results of weight loss measurement show that potassium sorbate has some inhibition of corrosion of Q235 steel in 0.5 mol/L NaCl solution, the inhibition efficiency increases with the increase of concentration. When the added PS concentration is 25.0 g/L, the maximum inhibition efficiency is 38.37%. The combination of PS and Zn²⁺ ions has a significantly synergistic inhibition effect, the corrosion inhibition efficiency is as high as 91.03%. Potentiodynamic polarization shows that the mixture of PS and Zn²⁺ ions can simultaneously inhibit the cathodic, anodic corrosion reactions of Q235 steel, belonging to an anodic-type corrosion inhibitors. Impedance spectroscopy shows that the mixture can form a dense corrosion inhibitor film on the electrode surface. XPS analysis confirms that the corrosion inhibitor film consists of potassium sorbate, iron oxide/hydroxide and Zn(OH)₂ precipitate.

Key words: potassium sorbate, Zn²⁺, Q235 steel, NaCl solution, synergistic inhibition effect

WANG Fengping, HU Xiaoqiang, DING Yanwei, LI Jielan, ZHANG Wei. Synergistic Inhibition Effect of Potassium Sorbate and Zn²⁺ Ions on Corrosion of Q235 Steel in NaCl Solution[J]. Chinese Journal of Applied Chemistry, 2020, 37(8): 960-968.

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Synergistic Inhibition Effect of Potassium Sorbate and Zn²⁺ Ions on Corrosion of Q235 Steel in NaCl Solution

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