Abstract
Plasma electrolytic oxidation (PEO) is an electrochemical process uses an environmentally-friendly aqueous electrolyte to oxidize the metal surfaces to form ceramic oxide coatings which impart a high corrosion and wear resistance. In this study we investigated the effect of current mode on the properties of PEO coatings formed on an AM60B magnesium alloy. Unipolar, bipolar and hybrid (combination of both) current modes were used in this work. Optical emission spectroscopy (OES) was employed to investigate the PEO plasma. Coatings prepared using a hybrid current mode had a dense inner layer with fewer defects. The order of the applied current modes (unipolar and bipolar modes) had a significant effect on the coating morphology and corrosion resistance. The effects of the negative current part of the pulses on the coating were studied by using a unipolar current mode with different pulse timings. Coatings produced with a longer off-time had more porosity, and hence lower corrosion resistance. The corrosion protection efficiency of these coatings are compared to those produced by PEO coatings on a AJ62 Mg-alloy.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
