采用氧化还原引发体系引发木薯淀粉与丙烯酰胺接枝共聚反应制备的天然木薯淀粉接枝共聚物（SGA），可以作为一种环境友好型“绿色”缓蚀剂。本文用失重法、动电位极化曲线、电化学阻抗（EIS）和扫描电子显微镜（SEM）首次研究了SGA在 1.0 mol/L HCl溶液中对冷轧钢的缓蚀作用。结果表明，SGA对冷轧钢具有良好的缓蚀作用，在钢表面的吸附符合Langmuir吸附等温式，为混合抑制型缓蚀剂；EIS谱呈半圆容抗弧，电荷转移电阻随缓蚀剂浓度的增加而增大。SEM表明SGA在钢表面吸附形成了致密的缓蚀剂膜层。
Cassava starch graft acryl amide copolymer (SGA) was prepared by grafting acryl amide onto starch with oxidization reduction reaction, which can be used as a good environmentally-friendly “green” inhibitor. The inhibition effect of SGA on the corrosion of cold rolled steel (CRS) in 1.0 mol/L HCl has been studied by weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and scanning electron microscope (SEM) methods. The results show that SGA is a good inhibitor in 1.0 mol/L HCl for CRS, and the adsorption of SGA on the CRS surface obeys Langmuir adsorption isotherm. Polarization curves show that SGA is a mixed-type inhibitor in hydrochloric acid. All EIS spectra exhibit one capacitive loop, and the charge transfer resistance increases with the inhibitor concentration. SEM results show that the introduction of SGA into HCl solution results in the formation of a compact and dense inhibitive film on the CRS surface.
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