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The effect of graded or constant bias voltages (-40 V, -80 V and -40/60/80 V)on size grain and surface defects of arc PVD deposited CrN films wasinvestigated. Corrosion resistance evaluated using electrochemical impedancespectroscopy (EIS) and potentiodynamic curves (Tafel) and the mechanicalbehavior evaluated by means of instrumented nanoindentation and scratch testingwas correlated with the microstructural changes. It was found that the biasvoltage variation affects corrosion behavior due to the presence of defects(i.e. open voids, droplets) which also affects the failure mechanisms andincreasing spallation. High bias voltage (-80 V) increases nano-hardness andthe elastic modulus due to the dense microstructure of the CrN coating.

Effect of Graded Bias Voltage on the Microstructure of arc-PVD CrN Films and its Response in Electrochemical & Mechanical Behavior