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Chemcial Industry and Engineering 2022, Vol. 39 Issue (2) :100-107    DOI: 10.13353/j.issn.1004.9533.20210307
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Corrosion inhibition of carbon steel in acid solution by starch-AA-CS terpolymer
HOU Daolin, YANG Wukui, DONG Sheying
College of Chemistry and Chemical Engineering, Xi'an University of Architecture and Technology, Xi'an 710311, China

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Abstract The copolymer SAAC was synthesized by starch, acrylic acid (AA) and chitosan (CS) as raw materials, and it was characterized by IR spectroscopy and X-ray diffraction. The corrosion inhibition and mechanism of SAAC on Q235 carbon steel under 1 mol·L-1 HCl were studied by electrochemical method, weight loss method, scanning electron microscope and energy spectrometer. The results showed that the corrosion inhibition rate of SAAC at 200 mg·L-1 could reach 90.1% at 30℃,which is a mixed corrosion inhibitor. According to Tafel curve and Gibbs free energy, the adsorption of SAAC on Q235 carbon steel followed the Langmuir adsorption isotherm, which is a physical and chemical co-adsorption. Therefore, SAAC is a kind of environmental protection corrosion inhibitor with wide application prospects.
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Articles by authors
HOU Daolin
YANG Wukui
DONG Sheying
Keywordsterpolymer;   corrosion inhibitor;   carbon steel;   polarization curve;   impedance spectra     
Received 2021-03-24;
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HOU Daolin, YANG Wukui, DONG Sheying.Corrosion inhibition of carbon steel in acid solution by starch-AA-CS terpolymer[J]  Chemcial Industry and Engineering, 2022,V39(2): 100-107
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