溶解
阴极保护
氢氧化物
水溶液
氯化物
电化学
无机化学
化学
特里斯
羟甲基
贵金属
金属
核化学
电极
立体化学
有机化学
物理化学
生物化学
作者
Taylor Cain,Carol Glover,Jamie Laird,Nick Birbilis,John R. Scully
出处
期刊:Corrosion
[NACE International]
日期:2020-09-16
卷期号:77 (2): 115-133
被引量:3
摘要
The anodically-enhanced cathodic activation of high-purity Mg was studied by global and local electrochemical measurements in unbuffered 0.6 M NaCl, 0.6 M NaCl saturated in Mg(OH)2, 0.1 M MgCl2, 0.1 M Na2SO4, and 0.1 M tris(hydroxymethyl)aminomethane hydrochloride (TRIS). The selection of diverse aqueous environments was deliberate in order to explore the effect of dissolution product upon subsequent cathodic activation. Cathodic activation was found to be strong in all of the chloride-containing environments where a porous hydroxide forms; weak in Na2SO4 where a denser, more compact hydroxide forms; and negligible in TRIS where no hydroxide forms. Elemental enrichment, mapped using microparticle-induced x-ray emission, revealed the enrichment of Fe only in Cl−-containing environments, suggesting that noble metal enrichment provides a stronger influence on cathodic activation than that of Mg(OH)2 films.
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