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- Title
Corrosion Performance of Wire Arc Deposited Zinc Aluminum Pseudo Alloy and Zinc 15 Aluminum Alloy Coatings on Steel in Chloride Environment.
- Authors
Yasoda, Ratna Divya; Huang, Ying; Qi, Xiaoning
- Abstract
This study investigated the corrosion performance of wire arc deposited zinc-aluminum pseudo alloy coating (Zn-Al pseudo alloy) with higher aluminum content and Zn-15Al alloy coating in the aggressive chloride environment. The performance of both coatings was assessed by employing morphological analysis, chemical composition and material characterization tests, and electrochemical studies. Micrographs of the as-deposited coatings revealed a denser and compact microstructure in the pseudo alloy coating compared to Zn-15Al coating. The electrochemical test results demonstrated that the pseudo alloy coating exhibited a four times lower corrosion rate and four times higher corrosion resistance compared to the Zn-15Al coating. Although, the formation of simonkolleite is noticed in the corrosion products of both the coatings, a more thin and compact corrosion product layer is observed in the pseudo alloy coating. The superior performance of Zn-Al pseudo alloy coating can be attributed to the presence of higher aluminum content and the existence of zinc-rich and aluminum-rich areas in the coating microstructure, where zinc offers sacrificial protection at the aluminum-rich region boundaries, in addition to the formation of stable corrosion products of zinc at zinc-rich areas, passivation of aluminum at the aluminum-rich areas, reduced the overall rate of corrosion in such coatings.
- Subjects
ALUMINUM-zinc alloys; ALUMINUM alloys; STEEL alloys; ZINC alloys; ALUMINUM ores; MATERIALS testing
- Publication
Journal of Thermal Spray Technology, 2022, Vol 31, Issue 6, p1918
- ISSN
1059-9630
- Publication type
Article
- DOI
10.1007/s11666-022-01329-9