In this paper, the results on the electrochemical impedance spectroscopy and corrosion properties of electrodeposited nanostructured Al2O3–Ni composite coatings are presented. The nanocomposite coatings were obtained by codeposition of alumina nanoparticles (13 nm) with nickel during plating process. The coating thickness was 50 μm on steel support and an average of nano Al2O3 particles inside of coatings at 15 vol.% was present. The structure

Medical applications where tribocorrosion has to be considered are orthopaedic and prosthetic implants, hip joints, amalgam restorative materials, and orthodontic brackets-archwire structures. In most cases, the degradation of biocompatible implant materials can lead to failure of medical therapy and cause a tissue inflammation. The dependence of the tribocorrosion of stainless steels AISI 304L orthodontic archwires sliding against corundum in Ringer’s

Tribocorrosion behaviour of Ni–SiC (30 μm size of SiC particles) micro-composite coatings, with a thickness about 50 μm, sliding against corundum balls in a 0.5 M Na2SO4 solution at room temperature was investigated. In-situ electrochemical measurements were performed on samples of different amount and dispersion state of SiC particles. These composite coatings are used in the automotive industry. The influence of SiC particles dispersion in

Electrocodeposition is a method successfully used to obtain composite coatings. The composite coatings in nickel matrix and nano-Al2O3 particles (20 nm) as dispersed phase were obtained from a Watts electrolytic bath at a current density of 3A/dm2. The concentration of nano-Al2O3 was 5, 10 and respectively 20g/L oxide in the bath. The effect of the embedded of Al2O3 nanoparticles in nickel matrix was studied. The surface morphology of layers was

The dependence of the tribocorrosion of stainless steels AISI 304L and SS 3M® orthodontic archwires sliding against corundum in a Ringer's solution on applied normal force, and sliding velocity, has been investigated using in situ electrochemical noise measurements. Applied normal force and sliding velocity were found to greatly affect current and potential during fretting-corrosion. An increase in normal force and sliding velocity induce an increase

Tribocorrosion of stellite 6 in sulphuric acid was studied with a pin-on-disc tribometer through test conditions of intermittent friction. The occurrence of a mechanism involving mechanical depassivation during friction and further repassivation during the latency period between two successive friction steps was demonstrated. Polarization curves measurements and wear measurements by weight loss together with microtopography surveys of the wear track