不锈钢基PbO_2-WC-CeO_2复合镀的机理及镀层性能

Electrodeposition of PbO_2-WC-CeO_2 Composite Coating on Stainless Steel Substrate and Evaluation of Its Electrochemical Properties as Inert Anode Material

不锈钢基PbO2-WC-CeO2复合电极克服了传统钛基二氧化铅(DSA)电极基体易钝化、寿命短和成本高等缺点,以往对其电化学性能研究不多。采用复合电沉积方式在不锈钢基体上制备了PbO2-WC-CeO2复合电极,通过循环伏安曲线(CV)考察了复合电极的电沉积过程;通过X射线衍射(XRD)、能谱分析仪考察了复合电极的元素组成;通过扫描电镜(SEM)考察了复合电极的表面形貌变化;通过Tafel曲线、析氧曲线考察了电极掺杂前后的电化学性能变化。结果表明:WC和CeO2固体颗粒的加入使得PbO2电沉积过程发生了择优生长和晶粒细化,电极耐腐蚀性能提高,催化活性和节能性能变佳。

PbO2-WC-CeO2 composite coating as an inert anode material was prepared on stainless steel substrate by composite electrodeposition.The electrodeposition process was examined based on measurement of the cyclic voltammograms.The morphology of as-deposited composite coating was observed with a scanning electron microscope,and its phase structure and elemental composition were analyzed by means of X-ray diffraction and energy dispersive spectrometry.Moreover,the Tafel curve and oxygen evolution curve of as-deposited composite coating were measured,and the variation in the electrochemical properties of the composite coating before and after doping WC and CeO2 was investigated.Results indicate that introducing WC and CeO2 particulates leads to preferential orientation and grain refinement of electrodeposited PbO2 coating.Resultant composite coating as an inert anode possesses improved corrosion resistance,catalytic activity,and energy-saving capability.