Characterization of mechanical properties and electrochemical behaviour in a Hank?s solution of 316L/Cr1- xAlxN system

[摘要] Cr1-xAlxN hard coatings were successfully deposited by R.F. reactive magnetron co-sputtering in an Ar/N2 gas mixture using chromium and aluminium targets on 316L stainless steel substrates. Crystallographic orientations associated to the Cr1-xAlxN FCC based in the conjugate complex of CrN and w-AlN phases, with ao=4.18Å lattice parameter for the ternary Cr1-xAlxN compound were identified by X-Ray diffraction. The thickness and roughness of the deposited coatings are 1.00±0.05nm and 2.65±0.6nm, respectively. The mechanical properties were determined by nanoindentation leading to a hardness of 27.8±2.6GPa and elastic modulus of 346GPa. The corrosion resistance of the coated 316L/Cr1-xAlxN system under simulated body fluid (SBF, Hank's solution) was determined via electrochemical impedance spectroscopy. A reduction in the corrosion rate of 99% in relation to uncoated 316L stainless steel substrate was found by Tafel. Thus, these coatings seem to be excellent candidates to be used in biomedical applications.

[发布机构] Universidad Del Valle, Cali, Colombia^1;Universidad Militar Nueva Granada, Bogotá, Colombia^2;Centro de Investigación y de Estudios Avanzados, Instituto Politécnico Nacional, Querétaro, Mexico^3;Servicio Nacional de Aprendizaje, Cali, Colombia^4

[效力级别] 化学

[关键词] 316 L stainless steel;Biomedical applications;Crystallographic orientations;Deposited coatings;Electrochemical behaviour;Hank's solution;Reactive magnetron co-sputtering;Simulated body fluids