摘要
The inhibition effect of an excellent environmental-friendly corrosion inhibitor--berberine on hot-dip coated steels in the diluted HCI has been investigated by using quantum chemistry analysis, mass-loss tests, elec- trochemical 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.
The inhibition effect of an excellent environmental-friendly corrosion inhibitor--berberine on hot-dip coated steels in the diluted HCI has been investigated by using quantum chemistry analysis, mass-loss tests, elec- trochemical 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.
基金
supported by the Shandong Provincial Natural Science Foundation, China (No. ZR2009BQ016)
the Fundamental Research Funds for the Central Universities, China (No. 12CX04055A)
