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采用失重法、开路电位(OCP)-时间曲线、动电位极化曲线、电化学阻抗谱(EIS)和扫描电子显微镜(SEM)研究了木薯淀粉接枝共聚物(CSGC)在1.0 mol/L HCl溶液中对Al的缓蚀性能。结果表明:CSGC对Al具有良好的缓蚀作用,当用量仅为50 mg/L时缓蚀率可高达90%以上,且在铝表面的吸附符合Langmuir吸附等温式;极化曲线表明CSGC为抑制阴极为主的混合抑制型缓蚀剂;EIS谱在高频区呈容抗弧,在低频区亦出现大段感抗弧,阻抗值随缓蚀剂浓度的增加而增大。SEM表明添加CSGC后Al表面的腐蚀程度会显著降低。
The effects of cassava starch graft copolymer (CSGC) in 1.0 mol / L HCl solution were studied by weight loss method, open circuit potential (OCP) -time curve, potentiodynamic polarization curve, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM) Corrosion inhibition of Al in solution. The results show that CSGC has a good corrosion inhibition effect on Al. When the dosage is only 50 mg / L, the corrosion inhibition rate can be as high as 90% or more, and the adsorption on aluminum surface accords with the Langmuir adsorption isotherm. The polarization curves indicate that CSGC is an inhibitor Cathode-based mixed inhibitor type inhibitor; EIS spectrum in the high-frequency region is arc-tolerant, in the low frequency region also appeared a large section of the resistance arc, the impedance value increases with the concentration of the inhibitor increases. The SEM shows that the degree of corrosion on the Al surface after CSGC addition is significantly reduced.