Abstract

PEREZ-MUNOZ, Diego; MARULANDA-AREVALO, José Luddey  and  TRISTANCHO-REYES, José Luis. Protection against corrosion by molten salts through aluminum coatings deposited by arc thermal spray on ASTM A53 grade B steel. Dyna rev.fac.nac.minas [online]. 2020, vol.87, n.213, pp.22-27. ISSN 0012-7353.  https://doi.org/10.15446/dyna.v87n213.83547.

ASTM A53 steel samples were coated with aluminum by EATS, they report continuity and adherence. Thermal treatment improved their performance against corrosion, because the aluminum inter-diffusions occur from coating into substrate and iron from substrate into coating. Samples were subjected to molten salt corrosion (20% Na2SO4 and 80% V2O5) in the temperature range of 400 °C-600 °C. Samples were characterized by SEM-EDS and the morphology of layers was studied, revealing good protection of the layer deposited, and the degradation of coating occurred above fusion temperatures of the salts. Moreover, the corrosion rate increased with temperature and decreased with exposition time.

Keywords : aluminium; corrosion; high temperature; thermal spray..

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