Department of chemistry, Manipal Institute of Technology, Manipal, MAHE, Karnataka, India.
Department of chemistry, Manipal Institute of Technology, Manipal, MAHE, Karnataka, India.
Int J Biol Macromol. 2018 Jun;112:461-472. doi: 10.1016/j.ijbiomac.2018.01.218. Epub 2018 Feb 2.
This work emphasizes the corrosion inhibition ability of pullulan, an environmentally benign fungal polysaccharide on acid corrosion of 6061Aluminum-15% SiC composite material (Al-CM). The electrochemical measurements such as potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) studies were carried out for the corrosion inhibition studies. Conditions were optimized to obtain maximum inhibition efficiency, by performing the experiment at varying concentrations of inhibitor, in the temperature range of 308K- 323K. Surface morphology studies were done to reaffirm the adsorption of inhibitor on the surface of composite material. Pullulan acted as mixed type of inhibitor with a maximum efficiency of 89% at 303K for the addition of 1.0 gL of inhibitor. Evaluation of kinetic and thermodynamic parameters revealed that inhibitor underwent physical adsorption onto the surface of Al-CM and obeyed Freundlich adsorption isotherm. The surface characterization like SEM-EDX, AFM confirmed the adsorption of pullulan molecule. Pullulan can be considered as effective, eco friendly green inhibitor for the corrosion control of Al-CM.
本工作强调了真菌多糖普鲁兰对 6061Al-15%SiC 复合材料（Al-CM）酸腐蚀的缓蚀能力。通过动电位极化（PDP）和电化学阻抗谱（EIS）研究等电化学测量方法进行了腐蚀抑制研究。通过在不同浓度抑制剂的条件下，在 308K-323K 的温度范围内进行实验，优化条件以获得最大的抑制效率。进行了表面形貌研究以证实抑制剂在复合材料表面的吸附。在 303K 下，添加 1.0 gL 的抑制剂时，普鲁兰作为一种混合类型的抑制剂，具有 89%的最大效率。动力学和热力学参数的评估表明，抑制剂在 Al-CM 表面发生物理吸附，并遵循弗伦德利希吸附等温线。表面特性如 SEM-EDX、AFM 证实了普鲁兰分子的吸附。普鲁兰可以被认为是有效、环保的绿色抑制剂，可用于控制 Al-CM 的腐蚀。
