Plasma electrolytic oxidation (PEO) coating to enhance in vitro corrosion resistance of AZ91 magnesium alloy coated with polydimethylsiloxane (PDMS)
Source abstract
Abstract
To improve the corrosion behavior of a magnesium alloy, two-step coatings have been fabricated through plasma electrolytic oxidation coating (PEO) under constant voltage conditions applied to the AZ91 substrate surface in the silicate electrolyte. A polymeric layer [Polydimethylsiloxane (PDMS)] has been successfully implemented by the immersion method on both bare AZ91 alloy and pre-treated samples by the PEO process. PEO coating contains MgO, MgSiO3, and Mg2SiO4 phases detected by X-ray diffraction patterns (XRD). The surface morphology observation investigated using the field emission scanning electron microscopy (FESEM) showed a porous and non-porous layer on the substrate for PEO and PEO/PDMS coatings, respectively. The topography and roughness of the PEO coating evaluated by atomic force microscopy (AFM) revealed a high roughness for the PEO coating. The chemical composition of coatings was determined using X-ray energy distribution spectroscopy (EDS), and the corrosion behavior of the AZ91 substrates with/without coating was studied by the potentiodynamic polarization test in the Ringer solution. The results showed that the corrosion (Ecorr) potential of the AZ91 substrate increased compared to a single-layer PDMS coating from − 1.48 to − 1.47 V, and their corrosion current density (icorr) reduced from 4.3 to 0.486 µA·cm−2 in the order given. However, by applying PEO coating as a pre-treatment utilizing the PEO/PDMS composite coating, these values were obtained − 0.75 V and 0.9 nA·cm−2, respectively. So, applying PEO/PDMS hybrid coating may effectively reduce the high corrosion rates of magnesium alloys as the main limitations in the physiological environment.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Magnesium Alloys: Properties and Applications · Corrosion Behavior and Inhibition · Hydrogen Storage and Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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