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Received October 31, 2014
Accepted February 25, 2015
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Cassava starch graft copolymer as an eco-friendly corrosion inhibitor for steel in H2SO4 solution
Faculty of Science, Southwest Forestry University, Kunming 650224, P. R. China 1Yunnan Key Laboratory of Wood Adhesives and Glue Products, Southwest Forestry University, Kunming 650224, P. R. China
xianghong-li@163.com
Korean Journal of Chemical Engineering, November 2015, 32(11), 2347-2354(8), 10.1007/s11814-015-0044-8
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Abstract
Cassava starch graft copolymer (CSGC) was prepared by grafting acryl amide (AA) onto cassava starch (CS). The inhibition effect of CSGC on the corrosion of cold rolled steel (CRS) in 1.0M H2SO4 solution was first studied by weight loss, potentiodynamic polarization curves, electrochemical impedance spectroscopy (EIS) and scanning electron microscope (SEM) methods. The results show that CSGC is a good inhibitor, and inhibition efficiency of CSGC is higher than that of CS or AA. The adsorption of CSGC on steel surface obeys Langmuir adsorption isotherm. CSGC is a mixed-type inhibitor at 20 oC, while mainly a cathodic inhibitor at 50 oC.
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