Corrosion of Anodically and Cathodically Polarized Magnesium in Aqueous Media

Abstract

The effect of current density, pH, and temperature on the anodic behavior, cathodic behavior, and corrosion of magnesium in aqueous solutions has been studied. A tentative mechanism for the anodic oxidation of magnesium is postulated. Local corrosion and/or undermining of metallic magnesium at the anode are appreciable and may, in fact, account for the observed low anodic current efficiencies of magnesium. An intergranular type of corrosion occurs at cathodically polarized magnesium at elevated temperatures. A hydrogen embrittlement theory is proposed to explain intergranular cathodic corrosion. ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 128.255.6.125 Downloaded on 2015-03-19 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 128.255.6.125 Downloaded on 2015-03-19 to IP Vol. 105, No. 5 CORROSION OF POLARIZED MAGNESIUM 247 6C ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 128.255.6.125 Downloaded on 2015-03-19 to IP

Effect of valency on material removal rate in electrochemical machining of aluminium

“…After few year a similar phenomena was observed in the electrochemical dissolution of a magnesium anode (Hoey and Cohen, 1958;Evans, 1960). In both of these cases, the oxidation state of the cation as calculated from Faraday's law was appreciably lower than that ordinarily associated with the metal in question thus a low valence state of the metal had apparently been active during anodic dissolution (Marsh and Schaschl, 1960).…”

“…Weight of aluminium dissolved electrochemically from an aluminium anode was found to be considerably greater than what indicated by Faraday's law (Hoey and Cohen, 1958;Evans, 1960). After few year a similar phenomena was observed in the electrochemical dissolution of a magnesium anode (Hoey and Cohen, 1958;Evans, 1960).…”

Struvite precipitation from urine with electrochemical magnesium dosage

“…According to these equations, the number of effectively transferred electrons range between 1 and 2 per magnesium ion (Hoey and Cohen, 1958;Makar and Kruger, 1990;Song, 2005), while a two-electron transfer is generally assumed for calculating the current efficiency (Eq. (3)).…”

Microstructure and in vitro degradation performance of Mg–Zn–Mn alloys for biomedical application

“…When Mg–Zn–Mn alloys are exposed to the corrosion medium, the following anodic and cathodic reactions take place First, magnesium dissolves and Mg 2+ cations are produced [Eq. (1)], possibly through intermediate steps involving the monovalent magnesium ion 35, 36. Second, magnesium dissolution is accompanied by hydrogen evolution [Eq.…”