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Zijian Song,Huanchun Cai,Qingyang Liu,Linhua Jiang,Hongqiang Chu 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.111 No.-
In this study, an ultrasound-assisted enzymatic extraction (UEE) method was proposed to augment theanti-corrosion performance of the green inhibitor extracted from waste Platanus acerifolia leaves. Chemical compositions and anticorrosive properties of UEE extract were characterized via multiple technologies. The adsorption film on the steel surface was characterized via X-ray photoelectron spectroscopy(XPS). The surface information of corroded steel was also analyzed. Results showed that, compared withthe ultrasound-assisted alkali extraction (UAE), UEE increased the utilization rate of raw plant materialsby 22%39%. After optimized via response surface methodology, the maximum yield of UEE extract couldreach 27.081 mg/g. Electrochemical results showed, compared with 3% UAE extract, the inhibition efficiencyof 3% UEE extract after 72 h in 0.5 M NaCl was increased by 22% while the extraction time wassaved by 90%. Microscopic observations also proved that UEE extract can effectively mitigate the corrosiondegree where the roughness of steel surface decreased by 63.67%. XPS results revealed that a carbonaceousprotecting layer was formed on steel surfaces. The inhibition mechanism analysis suggestedthat flavonoids and their derivatives were apt to adsorb on the steel surface via chelation and surfacephysical adsorption, which could block the pathway of chloride attack.
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