The effect of Ti(CN)/TiNb(CN) coating on erosion-corrosion resistance
Efecto del recubrimiento de Ti(CN)/TiNb(CN) sobre la resistencia a la corrosión-erosión
Keywords:
multilayer, dynamic corrosion, corrosion-erosion, erosion, scanning electron microscope (en)multicapas, corrosión dinámica, corrosión-erosión, erosión, microscopia electrónica de barrido (es)
The goal of this work was to study electrochemical behaviour in corrosion-erosion conditions for Ti(CN)/TiNb(CN) multilayer coatings having 1, 50, 100, 150 and 200 bilayer periods on AISI 4140 steel substrates by using a multi-target magnetron reactive sputtering device, with an r.f. source (13.56 MHz), two cylindrical magnetron cathodes and two stoichiometric TiC and Nb targets. The multilayers were evaluated by comparing them to corrosion, erosion and erosion corrosion for a 30º impact angle in a solution of 0.5 M NaCl and silica, analysing the effect of impact angle and the number of bilayers on these coatings' corrosion resistance. The electrochemical characterisation was performed using electrochemical impedance spectroscopy for analysing corrosion surface; surface morphology was characterised by using a high-resolution scanning electron microscope (SEM). The results showed a decreased corrosion rate for multilayer systems tested at 30°.
El objetivo de este trabajo es el de estudiar el comportamiento electroquímico bajo condiciones de corrosión-erosión a los recubrimientos multicapas de Ti(CN)/TiNb(CN) con periodos de 1, 50, 100, 150 y 200 bicapas depositadas en sustratos de acero AISI 4140, mediante un sistema magnetrón sputtering con r.f reactivo (13.56 MHz) y dos cátodos cilíndricos con estequiometría de los blancos de TiC y Nb. Las multicapas se evaluaron al comparar la corrosión, la erosión y la corrosión-erosión para un ángulo de impacto de 30° en una solución de 0,5 M NaCl y sílice, y al analizar el efecto del ángulo de impacto y el número de bicapas en función de la resistencia a la corrosión. La caracterización electroquímica se realizó mediante la técnica de espectroscopia de impedancia electroquímica para evaluar el proceso de corrosión en la superficie; la morfología superficial se caracterizó con la utilización de un microscopio electrónico de barrido (SEM). Los resultados muestran una disminución en la tasa de corrosión para los sistemas multicapa ensayada a 30°.
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