Corrosion Resistance of AZ91 Magnesium Alloy with Pulse Electrodeposited Ni-SiC Nanocomposite Coating

摘要

Magnesium and its alloys are the lightest of the structural metals, which makes them one of the mostudpromising materials to minimize vehicle weight, but poor surface properties restrict the application of these alloys.udIn this paper, Ni-SiC nanocomposite coatings were applied on AZ91 magnesium alloy from Watts bathudcontaining different amounts of SiC content by pulse electrodeposition technique. The morphology and phaseudanalysis were carried out by Scanning Electron Microscopy (SEM) and X-Ray Diffraction (XRD) analysis, respectively.udMicrohardness of specimens was measured and the results revealed a significant enhancement fromud74 H for bare AZ91 magnesium alloy to 523 HV for the specimen coated in the bath containing 15 g.L–1 SiC.udThe Corrosion behavior of the samples was studied by potentiodaynamic polarization, and the obtained dataudshowed superior corrosion resistance for coated AZ91 magnesium alloy, i.e. the corrosion current density decreasedudfrom 2.69 mA.cm–2, for the uncoated sample, to 0.00046 mA.cm–2, for coated specimen in the bath containingud15 g.L–1 SiC and the corrosion potential increased from – 2.069 V to – 0.33 V at the same conditions.When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/24893