International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

In this study, the tribocorrosion behavior of the materials utilized in manufacturing of biomedical implants (Ti-6Al-4V and Co-Cr alloys) was studied in a laboratory simulated artificial saliva (SAS) solution by using a linear reciprocating ball-on-plate tribometer with an integrated electrochemical cell. The open circuit potential (OCP) and the friction coefficient were monitored during the reciprocating ball- on-plate test. During the OCP tribocorrosion tests, the generated wear debris was transferred into the SAS and increased its optical density of the solution along with large scatters in the OCP potential and friction coefficient. In accordance with its poor tribocorrosion performance, Ti-6Al-4V alloy provided a large amount of wear debris transfer into the SAS along with the heavy metal attachment to the contact surface of the alumina ball and heavy fluctuations in the OCP potential and friction coefficient values during the sliding. This suggests that the Co-Cr alloy has a higher load bearing capacity than the Ti-6Al-4V alloy.

This study was initiated to compare the wear and corrosion performances of an AA7075 quality aluminum alloy after electroless Ni-P process. The characterization of the coating was made by microscopic examinations, thickness, surface roughness and hardness measurements. Wear and corrosion performances of the uncoated and coated samples were investigated by using a reciprocating wear tester and a Potentiodynamic Polarization Scanning (PDS) technique, respectively. Formation of Ni–P layer on AA7075 aluminum alloy accompanied not only by remarkable increase in the surface hardness, but also caused significant improvement in wear and corrosion resistances.

This paper examines the influence of the graphite morphology on the high temperature abrasive wear behavior of vermicular and nodular cast irons, having same hardness. Wear tests were conducted on a 240-mesh Al₂O₃ abrasive paper at various temperatures in between 25 and 450 °C. The results showed that in all cases, the nodular cast iron exhibits a higher wear resistance than the vermicular cast iron. Generally the examined vermicular and nodular cast irons exhibit the highest resistance to abrasion at 150°C.