𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Hydrogen deposition at iron from liquid ammonia

✍ Scribed by M. Klemm; K.E. Heusler

Book ID
103066666
Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
706 KB
Volume
36
Category
Article
ISSN
0013-4686

No coin nor oath required. For personal study only.

✦ Synopsis

The nermeation of hydrogen through iron sheets from a solution of ammonium chloride in liquid ammonia to an aqueous solution of 0.1 M sodium hydroxide was studied. The square of the hydrogen activity was proportional to the cathodic current density of hydrogen deposition as expected for a Volmer-Tafel mechanism. Exchange rates of the Tafel reaction were around ~r,~ = 4 pmol/cm-* s-' corresponding to j, = 0.4 pA/cm-*. The dependence of the hydrogen activity on the free corrosion potential can also be explained by a Volmer-Tafel mechanism, but not by a Volmer-Heyrovsky mechanism. Slow changes of the surface properties apparently due to a chemical reaction of ammonia with iron decrease the hydrogen activity and catalyse the Tafel recombination with respect to the Volmer reaction.

πŸ“œ SIMILAR VOLUMES

Iron and hydrogen electrodes in liquid a
Iron and hydrogen electrodes in liquid ammonia
✍ M. Ahrens; K.E. Heusler πŸ“‚ Article πŸ“… 1982 πŸ› Elsevier Science 🌐 English βš– 474 KB

m-t--Equilibrium potentials of the iron(H)-iron electrode vs Tl-TICI; 0.1 M NH.Cl in liquid ammonia sre determined from intcrsnctions of Tafef lines for iron deposition and dissolution. The hydro9cn ekctmde is shown to behave rsvcrsib)y at pllpdium hydride, but not at platinum with respect to the de