Inhibition of self-corrosion in magnesium by poisoning hydrogen recombination on iron impurities

Influence of casting porosity on the corrosion behaviour of Mg0.1Si

“…It is indeed well known that the corrosion rate of low-purity Mg, and many Mg alloys, increases with the extent of corrosion, and thereby there is an increase in the speed of the cathodic reaction [4,5,14,21,24,25,28,[55][56][57]. What is new in these more recent works [50][51][52][53][54] is the claim that this enhanced cathodic reaction provides a full description of the Mg corrosion mechanism. No consideration is given to the experimental measurements of low apparent valence for Mg.…”

“…This is consistent with the model proposed by Song More recently Frankel et al [49] have proposed an explanation for the experimental observations (ii) based on anodic dissolution causing enhanced kinetics of the cathodic reaction of hydrogen evolution because of an increase in the exchange current density of the hydrogen evolution reaction on the Mg surface on anodic polarisation. There have been a number of works, which have expressed support [50][51][52][53][54]. It is indeed well known that the corrosion rate of low-purity Mg, and many Mg alloys, increases with the extent of corrosion, and thereby there is an increase in the speed of the cathodic reaction [4,5,14,21,24,25,28,[55][56][57].…”

Theoretical Limits to the Anode Potential in Aqueous Mg–Air Batteries

“…Mg + OH − (aq) ⇌ MgOH* + e − [6] MgOH* + OH − (aq) ⇌ Mg(OH) 2 * + e − [7] Mg(OH) 2 * ⇌ Mg 2+ (aq) + 2 OH − (aq) (dissolution) [8] Mg 2+ (aq) + 2 OH − (aq) ⇌ Mg(OH) 2 (s) (precipitation) [9] Here, Mg denotes a surface site and * after a molecule denotes an adsorbed species. Steps [6] and [7] are electrochemical, while [8] and [9] are strictly chemical steps and represent dissolution of one surface Mg(OH) 2 * unit and precipitation of aqueous Mg 2+ and OH − ions to form solid Mg(OH) 2 , respectively.…”

“…Steps [6] and [7] are electrochemical, while [8] and [9] are strictly chemical steps and represent dissolution of one surface Mg(OH) 2 * unit and precipitation of aqueous Mg 2+ and OH − ions to form solid Mg(OH) 2 , respectively.…”

“…5,9,10 These potentials correspond to potential losses of ~0.9 V and ~1.3 V from the Mg anode alone in the Mg-air battery (compared to the thermodynamic potential of −2.48 V from [3]). …”