A study of the initial stages of iron passivation in neutral solutions using the quartz crystal resonator technique

• Published in: Protection of metals and physical chemistry of surfaces Vol. 52; no. 5; pp. 936 - 946
• Main Authors: Marshakov, A. I., Rybkina, A. A., Maksaeva, L. B., Petrunin, M. A., Nazarov, A. P.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.09.2016; Springer Nature B.V
• Subjects: Anodic; Anodic currents; Atomic hydrogen; Borate solutions; Characterization and Evaluation of Materials; Chemistry and Materials Science; Chronoamperometry; Corrosion and Coatings; Crystal resonators; Different stages; Dissolution; Film growth; Formations; Hydrogenation; Industrial Chemistry/Chemical Engineering; Inorganic Chemistry; Investigation Methods for Physicochemical Systems; Iron; Iron dissolution; Iron passivation; Materials Science; Metallic Materials; Neutral solution; Passivation; Quartz; Quartz crystal resonator; Quartz crystals; Resonators; Tribology
• ISSN: 2070-2051; 2070-206X
• DOI: 10.1134/S2070205116030205

The initial period of growth of a passive film of iron in borate solutions (pH 7.4 and 6.7) is studied using the quartz crystal resonator technique (EQSN) and pulsed chronoamperometry. Dependences of the surface layer thickness on time are obtained at the metal passivation and prepassivation potentials. Regions corresponding to different stages of passive layer formation are found in anodic current transients, which allowed the ambiguous effect of atomic hydrogen on kinetics of hydrogenated iron dissolution to be explained. It is shown that the iron hydrogenation promoter prevents formation of a primary passive film by accelerating iron dissolution at prepassivation potentials.