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Protein-surfactant aggregate as a potential corrosion inhibitor for mild steel in sulphuric acid: zein-SDS system

机译:蛋白质表面活性剂聚集体作为硫酸中低碳钢的潜在腐蚀抑制剂:玉米蛋白-SDS系统

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摘要

The corrosion inhibition of mild steel in 0.5 M H2SO4 in the presence of zein (a biocompatible water insoluble corn protein) and sodium dodecyl sulfate (SDS, an anionic surfactant) is studied employing electrochemical techniques and gravimetric measurement. SEM and FTIR techniques are employed to observe the morphology of the corroded surface and the nature of the adsorbed layer. It is revealed that SDS micelles in high concentration exhibit low corrosion inhibition efficiency for mild steel in H2SO4, but inhibition efficiency increases drastically in a zein-SDS mixed system, reaching more than 90% in the presence of 4 mM SDS-500 ppm zein. The dependence of the inhibition efficiency on surfactant-protein ratio is explained by zein-SDS complex formation, followed by SDS induced conformational change of zein.
机译:利用电化学技术和重量分析法研究了玉米醇溶蛋白(一种生物相容性水不溶性玉米蛋白)和十二烷基硫酸钠(SDS,一种阴离子表面活性剂)在0.5 M H2SO4中对低碳钢的腐蚀抑制作用。 SEM和FTIR技术用于观察腐蚀表面的形貌和吸附层的性质。结果表明,高浓度的SDS胶束在H2SO4中对低碳钢的腐蚀抑制效率较低,但在玉米醇溶蛋白-SDS混合系统中,抑制效率急剧增加,在4 mM SDS-500 ppm玉米醇溶蛋白存在下,抑制效率达到90%以上。玉米醇溶蛋白-SDS复合物的形成解释了抑制效率对表面活性剂-蛋白质比例的依赖性,然后是玉米醇溶蛋白诱导的玉米醇溶蛋白构象变化。

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