E. A. Karfidov, B. A. Rusanov, V. E. Sidorov, E. V. Nikitina, D. Janickovic, P. Svec Sr.
ABSTRACT
Amorphous and nano-crystalline aluminum-based alloys especially compositions with transition and rare-earth metals have improved mechanical characteristics and high chemical resistance. The influence of transition metals ratio on corrosion-electrochemical behavior of aluminum-nickel-cobalt-neodymium amorphous compositions was studied in present work. It was found that Al86Ni4Co4Nd6 amorphous alloy demonstrates greater corrosion resistance than Al86Ni6Co2Nd6 composition according to the data of gravimetric and chemical analysis (corrosion rates 0.635 and 2.1 mg/m2·h, respectively). Corrosion potential shifts to the electronegative region with increase in concentration of nickel in composition of the initial alloy. The investigated amorphous compositions have a wide passivation area due to the formation of stable layer of aluminum oxide on surface, which determines their resistance under the conditions under study. Al-Ni-Co-Nd amorphous alloys can be considered as promising compositions for the manufacture of aluminum-based protective coatings.
KEYWORDS
crystallization, corrosion, aluminum alloys, amorphous alloys
DOI: 10.31857/S0235010622010054