Synergistic inhibition between the gemini surfactant and bromide ion for steel corrosion in sulphuric acid |
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| Authors: | Zhen-Yu Wu Zheng Fang Ling-Guang Qiu Yun Wu Zong-Qun Li Tao Xu Wei Wang Xia Jiang |
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| Affiliation: | (1) School of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China;(2) School of Chemistry and Chemical Engineering, Key Laboratory of Environment-Friendly Polymer Materials of Anhui Province, Anhui University, Hefei, 230039, China |
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| Abstract: | The inhibitive synergistic effect between a cationic gemini surfactant, 1,3-propane-bis(dimethyl dodecylammonium bromide)
(12-3-12), and bromide ion for the corrosion inhibition of cold rolled steel in 0.5 mol L−1 H2SO4 was investigated by weight loss, potentiodynamic polarization method and electrochemical impedance spectroscopy (EIS). The
inhibition system composed by 12-3-12 and bromide ion is efficient. The adsorption mechanism of the 12-3-12 and bromide ion
on steel in acidic medium is discussed on the basis of experimental data and an adsorption model is proposed. Adsorption of
inhibitor system on the mild steel surface in acidic medium obeys Langmuir’s adsorption isotherm. In addition, potentiodynamic
polarization studies show that the system acts as a mixed-type inhibitor. Electrochemical impedance spectroscopy also suggests
the formation of a protective layer on the steel surface by the adsorption of surfactant molecules and bromide ions. |
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| Keywords: | Gemini surfactant Synergistic effect Adsorption Potentiodynamic polarization Electrochemical impedance spectroscopy (EIS) |
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