Starch-AA-CS三元共聚物对酸溶液中碳钢的缓蚀作用  

Corrosion inhibition of carbon steel in acid solution by starch-AA-CS terpolymer

作　　者：侯道林 杨武魁 董社英[1] HOU Daolin;YANG Wukui;DONG Sheying(College of Chemistry and Chemical Engineering,Xi’an University of Architecture and Technology,Xi’an 710311,China)

机构地区：[1]西安建筑科技大学化学与化工学院,西安710311

出　　处：《化学工业与工程》2022年第2期100-107,共8页Chemical Industry and Engineering

基　　金：陕西省重点研发计划一般项目-工业领域(2020GY-306);国家自然科学基金项目(21575111)。

摘　　要：以淀粉(Starch)、丙烯酸(AA)和壳聚糖(CS)为原料合成三元共聚物(SAAC)。利用红外光谱(FT-IR)和X射线衍射(XRD)进行结构表征,并通过电化学方法、失量法、扫描电子显微镜(SEM)和能谱仪(EDS)研究SAAC在1 mol·L^(-1)HCl环境下对Q235碳钢的缓蚀作用及机理。结果显示,SAAC是一种混合型缓蚀剂,30℃时,200 mg·L^(-1)的SAAC的缓蚀率可达90.1%。通过Gibbs自由能和Tafel曲线可知,SAAC在Q235碳钢表面的吸附符合Langmuir吸附等温式,同时存在物理吸附与化学吸附。SAAC合成原料经济、环保,合成条件温和,是一种具有广泛应用前景的绿色环保型缓蚀剂。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.

关 键 词：三元聚合物 缓蚀剂 碳钢 极化曲线 阻抗谱图 

分 类 号：O69[理学—化学]