摘要
为研究铅基合金在电解锌液中的腐蚀过程,利用电化学交流阻抗谱(EIS)和Zsimp-Win软件拟合研究了铅及其合金等4种电极在电解锌液中自腐蚀电位下的腐蚀行为。结果表明:Pb-Ag(0.30%)-Sb(0.2%)合金的耐蚀性远大于纯Pb,Pb-Ag(0.30%)和Pb-Ag(0.75%)合金;铅基合金的腐蚀行为受电极电位以及疏松多孔的腐蚀产物的表面覆盖度2个变量的影响,腐蚀机理是腐蚀产物的覆盖及阴极反应被抑制;Ag和Sb的加入不仅细化和提高了合金的颗粒及硬度,也细化了腐蚀产物层的颗粒;在电解锌时,铅基合金阳极中的铅易反溶进入溶液,进而在阴极析出影响阴极锌产品质量。
The corrosion process of four kinds of anodes made of Pb and Pbbased alloy was studied by electrochemical impedance spectroscopy and ZsimpWin software fitting technique,and the corrosion behavior of the four kinds of anodes under freecorrosion potential was investigated.It was found that PbAgSb ternary alloy containing 0.30% Ag and 0.2% Sb possessed much better corrosion resistance than pure Pb as well as PbAg alloy containing 0.30% and 0.75% Ag.The corrosion behavior of the Pbbased alloy anodes was highly dependent on the potential of the electrodes and the coverage extent of the corroded products on the electrode surface.In other words,the formation of the corroded products and the inhibition of the anodic reactions had significant effects on the corrosion behavior of Pbbased alloy anodes.Besides,introducing Ag and Sb into Pbbased alloy not only helped to refine the grains and increase the hardness of the alloy,but also helped to refine the grains of the corroded products.Moreover,lead in Pbbased alloy anodes was easily inversely dissolved into the electrolyte and tended to precipitate at the cathode during Zn electrolysis,thereby causing damage to the quality of the electrolytic Zn cathode.
出处
《材料保护》
CAS
CSCD
北大核心
2013年第2期23-25,29,共4页
Materials Protection
基金
国家自然科学基金(50964008)
昆明理工大学分析测试基金(2011451)资助
关键词
铅基合金
电化学交流阻抗谱
耐蚀性
电解锌液
Pbbased alloy
electrochemical impedance spectroscopy
corrosion behavior
zinc electrolyte
