Berberine as an Environmental-Friendly Inhibitor for Hot-Dip Coated Steels in Diluted Hydrochloric Acid

Abstract

Abstract:

The inhibition effect of an excellent environmental-friendly corrosion inhibitor|berberine on hot-dip coated steels in the diluted HCl has been investigated by using quantum chemistry analysis, mass-loss tests, electrochemical measurements and scanning electron microscopy (SEM) observation. Calculation results show that berberine has a nearly planar structure with a number of active centers. The value of Mulliken charge, and the distribution of the highest occupied molecular orbital (HOMO) and the lower unoccupied molecular orbital (LUMO) imply that berberine has a good ability of electron exchange with metal surface. The test results indicate that inhibition efficiency (IE%) increases with the inhibitor concentration and the highest IE can reach 99%. Adsorption of berberine on the coating surface follows Langmuir adsorption isotherm with a single molecular layer by chemisorption.

Key words: Berberine, Inhibition effects, Hot-dip coated steel, Corrosion

Hong Ju, Yulin Ju, Yan Li. Berberine as an Environmental-Friendly Inhibitor for Hot-Dip Coated Steels in Diluted Hydrochloric Acid[J]. J. Mater. Sci. Technol., 2012, 28(9): 809-816.

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