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以木薯淀粉(CS)、丙烯酰胺(AA)及二甲基二烯丙基氯化铵(DMDAAC)为原料,制备出阳离子木薯淀粉接枝共聚物(CCSGC);采用失重法、开路电位-时间曲线、动电位极化曲线、电化学阻抗谱(EIS)和SEM考察了CCSGC对冷轧钢在HCl介质中的缓蚀性能。结果表明:CCSGC在1.0 mol/L HCl溶液中对冷轧钢具有优良的缓蚀作用,20~50℃下,当CCSGC添加量为50 mg/L时,冷轧钢的最大缓蚀率均能超过92%,缓蚀性能明显高于CS、AA、DMDAAC或CS/AA/DMDAAC混合物。CCSGC在钢表面的吸附符合Langmuir吸附等温式,且为混乱度增加、放热的混合吸附过程。CCSGC为通过“几何覆盖效应”同时抑制阴极和阳极的混合抑制型缓蚀剂;EIS结果表明:EIS呈存在弥散效应的容抗弧,电荷转移电阻随CCSGC质量浓度的增加而增大,但双电层电容值却减小。SEM结果表明:CCSGC能有效地抑制钢在HCl中的腐蚀。
Cationic tapioca starch graft copolymer (CCSGC) was prepared from cassava starch (CS), acrylamide (AA) and dimethyldiallylammonium chloride (DMDAAC). The weight loss method, open circuit potential- Curves, potentiodynamic polarization curves, electrochemical impedance spectroscopy (EIS) and SEM were used to examine the corrosion inhibition performance of CCSGC on the cold rolled steel in HCl medium. The results showed that CCSGC had a good corrosion inhibition effect on cold-rolled steel in 1.0 mol / L HCl solution. The maximum corrosion inhibition rate of CCSGC was 50 mg / L when CCSGC was added at 20-50 ℃ Above 92%, the corrosion inhibition performance is obviously higher than that of CS, AA, DMDAAC or CS / AA / DMDAAC mixture. The adsorption of CCSGC on the steel surface conforms to the Langmuir adsorption isotherm and is a mixed adsorption process with increased confusion and exothermicity. CCSGC is a mixed inhibitor with both cathodic and anodic inhibition through the “geometric coverage effect”. The EIS results show that the EIS exhibits an anti-arc with diffusive effect. The charge transfer resistance increases with the increase of the mass concentration of CCSGC, However, the electric double layer capacitance decreases. SEM results show that: CCSGC can effectively inhibit the corrosion of steel in HCl.