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Synergistic inhibition effect of rare earth cerium(IV) ion and sodium oleate on the corrosion of cold rolled steel in phosphoric acid solution |
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| Authors: | Xianghong Li Shuduan Deng Guannan Mu |
| Affiliation: | a Department of Fundamental Courses, Southwest Forestry University, Kunming 650224, PR China b Faculty of Wood Science and Decoration Engineering, Southwest Forestry University, Kunming 650224, PR China c Department of Chemistry, Yunnan University, Kunming 650091, PR China |
| Abstract: | The synergistic inhibition effect of rare earth cerium(IV) ion (Ce4+) and sodium oleate (SO) on the corrosion of cold rolled steel (CRS) in 3.0 M phosphoric acid (H3PO4) has been investigated by weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and scanning electron microscope (SEM) methods. The results reveal that SO has a moderate inhibitive effect and its adsorption obeys Temkin adsorption isotherm. Ce4+ has a poor effect. However, incorporation of Ce4+ with SO improves the inhibition performance significantly, and exhibits synergistic inhibition effect. SO acts as a cathodic inhibitor, while SO/Ce4+ mixture acts as a mixed-type inhibitor. |
| Keywords: | A. Steel B. EIS B. Polarization B. SEM C. Acid inhibition |
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