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The corrosion resistance of 140MXC, 530AS and 560AS coatings produced by thermal spraying
Resistencia a la corrosión de recubrimientos 140mxc, 530as y 560as producidos por proyección térmica
DOI:
https://doi.org/10.15446/ing.investig.v33n1.37662Keywords:
Thermal spray, corrosion, nanocomposite, multilayer, pseudoalloy. (en)Proyección térmica, corrosión, nanocomposito, multicapas, pseudoaleaciones. (es)
Three commercial materials were deposited using electric arc thermal spraying: 140MXC (with Fe, W, Cr, Nb), 530AS (AISI 1015 steel) and 560AS (AISI 420 steel) on AISI 4340 steel. The aim of this paper was to evaluate the best strategy for improving a coating-substrate system's corrosion resistance, using the following combinations: homogeneous single coatings, bilayers consisting of 530AS or 560AS under 140MXC and 140MXC + 530AS and 140MXC + 560AS coatings deposited simultaneously. The coatings were characterised using optical microscopy, scanning electron microscopy and X-ray diffraction. Corrosion resistance was evaluated through potentiodynamic polarisation and hardness by using the Vickers test.
Corrosion resistance depends on the amount of microstructure defects, the deposition strategy and the alloy elements. However, corrosion resistance was similar in single coatings of 140MXC and bilayers, having -630 V corrosion potential and 708 nA corrosion current. The details and corrosion mechanism of the coatings so produced are described in this paper.
Mediante proyección térmica de arco eléctrico fueron depositados tres materiales comercialmente conocidos como: 140 MXC (a base de Fe, W, Cr, Nb), 530 AS (acero AISI 1015) y 560 AS (acero AISI 420), sobre acero AISI 4340. Con el objetivo de evaluar la mejor estrategia para incrementar la resistencia a la corrosión en el sistema capa-sustrato, los recubrimientos fueron depositados de tres formas: 1) monocapas homogéneas de cada material; 2) bicapas compuestas de una monocapa de 530 AS o de 560 AS y la segunda de140 MXC en ambos casos; y 3) recubrimientos tipo monocapa, el primero depositando de manera simultánea 140 MXC + 530 AS y otro depositando de manera simultánea 140 MXC + 560 AS. Los recubrimientos fueron caracterizados mediante microscopía óptica, microscopía electrónica de barrido y difracción de rayos X. Fue evaluada la resistencia a la corrosión por medio de polarización potenciodinámica y la dureza mediante el ensayo Vickers.
Se encontró que la resistencia a la corrosión en los recubrimientos producidos depende de la cantidad de defectos en la microestructura, de la estrategia de depósito y de los elementos en aleación. La resistencia a la corrosión fue muy similar en los recubrimientos producidos con alambres disímiles o bicapas, con un potencial de corrosión de -630 V y una densidad de corriente de 708 nm. Los detalles y mecanismos de corrosión de los recubrimientos producidos se describen en esta investigación.
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