The Role of Preceding Parallel Chemical Reactions and Reactive Nanoclusters in the Processes of Phase Transformations of Intermetallic Compounds

• Published in: Protection of metals and physical chemistry of surfaces 2018-11, Vol.54 (6), p.1026-1031
• Main Authors: Vigdorovich, V. I., Tsygankova, L. E., Shel, N. V.
• Format: Article
• Language: English
• Subjects: Aluminum; Anodic polarization; Antimony compounds; Cadmium; Cathodic polarization; Cations; Characterization and Evaluation of Materials; Chemical compounds; Chemical reactions; Chemical reduction; Chemistry and Materials Science; Corrosion and Coatings; Crystal defects; Crystal lattices; Crystal structure; Electrode polarization; Industrial Chemistry/Chemical Engineering; Inorganic Chemistry; Intermetallic compounds; Ionization; Magnesium; Materials Science; Metallic Materials; Nanoclusters; Nuclei (nuclear physics); Organic chemistry; Phase transitions; Physicochemical Processes at the Interfaces; Tribology; Zinc
• ISSN: 2070-2051; 2070-206X
• DOI: 10.1134/S2070205118060278

Using the chemical, electrochemical, and X-ray phase analysis, it has been shown that intermetallic compounds in Zn–Sb, Cd–Sb, Mg–Sb, and Al–Sb systems dissolve mainly with metal ionization, partial ionization of antimony, and parallel processes such as “intermetallic compound–Sb” phase rearrangement and reverse reduction of the Sb 3+ cations. It is postulated that the phase transformation process proceeds with the formation of a defective crystal lattice and appearance of reactive nanoclusters that interact to produce nuclei of a new phase and then a crystal structure. This process proceeds on the background of a partial uniform dissolution of the studied intermetallic compounds with reverse electrochemical reduction of Sb(III) cations in successive independent processes, as well as the parallel formation of the Sb-based few-atomic reactive clusters and further polyatomic nuclei of a similar phase. Chemical and electrochemical processes occur independently, but their relative rate depends on the magnitude of the potential determined by the level of cathodic and anodic polarization.