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Assessment of tribocorrosion behaviour of steel 316 LVM coated with HfN and HfN/Hf

Abstract:

Monolayers of Hafnium nitride (HfN) and multilayers of hafnium nitride (HfN/Hf) were fabricate with bilayers period of 1, 30 and 50, these were deposited on biomedical level stainless steel AISI 316LVM, using the RF magnetron sputtering reactive method with a source radio frequency (13.56 MHz) and hafnium targets. The electrochemical behaviour simulated the aggressive conditions as presented in the human body applying the tribocorrosión technique (combination of wear and corrosion in aqueous environment), performed with Gamry equipment PCI 4 to which it is adapted a pin on disk tribometer. The test were performed immersed in Hanks solution (Hanks balanced salt solution), the electrochemical cell is composed of a platinum counter electrode, a reference electrode Ag/AgCl and a working electrode (steel with and without coating) at a temperature of 37 ± 0.2°C, the test was done by electrochemical impedance spectroscopy (EIS). Regarding the results, was found the multilayer coating of [HfN/Hf]n increases the polarization resistance and decreases the coefficient of friction reported for the substrate and the monolayer of HfN, indicating a good wear and corrosion resistance.