报告题目：Anticorrosive strategies of conductive polyurethane multiwalled carbon nanotube nanocomposites for metals and alloys

报告时间：2022.11.22 8:40—9:40

报告地点：腾讯会议 会议 ID：101-844-108

主办单位：安阳工学院 材料科学与工程学院 化学与环境工程学院

主讲人姓名：郭占虎 教授Prof. Zhan-hu Guo

报告内容摘要：Conductive polyurethane (PU) nanocomposite coatings filled with multiwalled carbon nanotubes (MWNTs) fabricated by employing an in situ surface-initiated-polymerization (SIP) method were tested for corrosion prevention of stainless steel (SS). The nanocomposites exhibited a good response of electrical conductivity change to the strain during the cyclic tensile strain test. The anticorrosion properties of these nanocomposite coatings on the SS surface were evaluated in 3.0 wt% NaCl aqueous solution by monitoring the open circuit potential (Eocp) and tracing quasi-stationary polarization (Tafel) of the nanocomposite-coated stainless steel (MWNT/PU–SS) electrode. Electrochemical impedance spectroscopy (EIS) was also obtained to give an insight into the anticorrosion protection of SS. Thenanocomposite displayed a good chemical stability over long immersion in a corrosive environment. A significant positive shift of nearly 1.0 V in the Eocp was observed from the Eocp–time curve. Extrapolation of Tafel plots gave a much more positive corrosion potential (Ecorr) and a lower corrosion current (Icorr). A protection efficiency as high as 97.70% was obtained. An equivalent circuit of the coating was proposed to fit the EIS data, confirming an effective corrosion protection for SS. The results indicate that the polyurethane matrix combined with the well dispersed MWNT reinforcements provided a significant physical barrier against the attack of corrosive ions in the solution for SS while providing a channel for the conductivity.

主讲人简介：郭占虎，诺森比亚大学教授。国外著名专家，现担任美国化工协会复合材料副主席。研究方向包括纳米结构材料、聚合物纳米合成、纳米制造、超导聚合物纳米合成、环境可持续发展和能源效率提高等。先后获得拉马尔大学功勋奖、学术奖。主持3项美国自然科学基金和多个科研项目，拥有5个美国专利。