【作者】 高志强； 张达威； 江社明； 张启富； 李晓刚；

【Author】 Zhiqiang Gao;Dawei Zhang;Sheming Jiang;Qifu Zhang;Xiaogang Li;Corrosion & Protection Center, University of Science & Technology Beijing;National Engineering Laboratory of Advanced Coating Technology for Metals, Central Iron & Steel Research Institute;

【机构】 北京科技大学腐蚀与防护中心； 钢铁研究总院先进金属材料涂镀国家工程实验室；

【摘要】 本文借助于ZRA(zero resistance ammeter)模式的电化学噪声技术研究了草酸氧钒对热镀锌钢板(hot-dip galvanized steel, HDG)腐蚀的抑制机理。实验中采用一套分离电解池装置实现了电极反应的分离。向分离电解池的阴极一侧注入草酸氧钒溶液显著地降低电流噪声信号,而向阳极一侧注入溶液对电流噪声信号几乎没有影响。V(Ⅳ)(四价钒)在阴极电极表面还原为V(Ⅲ)(三价钒),并形成一层V(Ⅲ)的膜层以实现对氧的还原反应的抑制。V(Ⅳ)作为一种阴极抑制剂,归功于形成的V(Ⅲ)膜层占据氧的还原反应的活跃区域。更多还原

【Abstract】 The mechanisms of corrosion inhibition of hot-dip galvanized(HDG) steel by vanadyl oxalate were studied using electrochemical noise technique in zero resistance ammeter(ZRA) model. The separation of electrode reactions was achieved using a split cell design. Injection of vanadyl oxalate solution to the cathode side of split cells significantly reduced the galvanic current, whereas injection to the anode side had little effect on the galvanic current. V(Ⅳ)(tetravalent vanadium) inhibits oxygen reduction by a mechanism involving V(Ⅳ) reduction to V(Ⅲ)(trivalent vanadium) and formation of V(Ⅲ) layers on the cathode. V(Ⅳ) acts as a cathodic inhibitor, due to V(Ⅲ) layer occupation of active sites for oxygen reduction.更多还原