铝/铅-碳化钨-氧化铈复合电极的耐腐蚀性能

Corrosion resistance of aluminum/lead-tungsten carbide-cerium oxide composite electrode

以1060铝为基体,在由Pb(CH3COO)2220g/L,HBF4170g/L,H3BO314g/L,明胶2g/L,十六烷基三甲基溴化铵0.5～1.0g/L组成的基础镀液中,电沉积制得Pb-WC-CeO2复合镀层。通过测定其作阳极电解锌时的塔菲尔曲线,研究了WC和CeO2颗粒的质量浓度、电流密度、温度及搅拌速率对Pb-WC-CeO2复合镀层耐蚀性的影响,得到最佳工艺为:WC40g/L,CeO230g/L,温度40°C,电流密度40mA/cm2,搅拌速率350r/min。Pb-WC和Pb-WC-CeO2的腐蚀电位分别比纯铅镀层正0.005V和0.050V。Pb-WC-CeO2镀层表面最为均匀细致,耐蚀性最强。

A Pb-WC-CeO2 composite coating was prepared by electroplating with 1060 aluminum as substrate from a bath containing Pb（CH3COO）2 220 g/L, HBF4 170 g/L, HaBO3 14 g/L, gelatin 2 g/L, and cetrimonium bromide 0.5-1.0 g/L. The effects of mass concentrations of WC and CeO2 particles, temperature, current density, and stirring rate on the corrosion resistance of the composite coating as anode for electrolysis of zinc were studied by Tafel curves measurement. The optimal process parameters were determined as follows： WC 40 g/L, CeO230 g/L, temperature 40℃, current density 40 mA/cm2, and stirring rate 350 r/min. The positive shift of corrosion potential is 0.005 V for Pb-WC and 0.050 V for Pb-WC-CeO2 as compared with that of pure lead coating. The Pb-WC-CeO2 composite coating has the finest and most uniform surface and excellent corrosion resistance.