铜
腐蚀
钯
化学
水溶液
阴极保护
无机化学
金属
电化学
溴化物
氯化物
铜水管的冲蚀腐蚀
冶金
材料科学
电极
催化作用
物理化学
有机化学
作者
M.D. Benari,Glenn Hefter
标识
DOI:10.1016/0013-4686(91)85131-p
摘要
A detailed study has been made of the mechanisms of the corrosion of copper, silver, palladium and gold by iron(III) and copper(II) in chloride and bromide media in both aqueous and dimethylsulphoxide (DMSO) solutions. The mechanisms were elucidated by rotating disc methods. In the absence of complicating factors such as surface film formation, observed corrosion potentials were found to be in good agreement with those predicted from separate studies of the anodic and cathodic half-reactions. All of the metals studied, with the possible exception of copper, are more readily corroded in DMSO solutions. Furthermore, the corrosion rates in DMSO are in general cathodic-diffusion controlled, ie, they are limited only by the rate of mass transfer of the oxidant [Fe(III) or Cu(II)] to the metal surface. In contrast, the aqueous corrosion reactions are often complicated by surface film formation. The implication of these findings for the hydrometallurgical processing of these metals are briefly discussed.
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