Effect of Nanoparticles on the Erosion-Corrosion Resistance Property of a Ni-Based Alloying Layer

Abstract

AnanoparticlereinforcedNi鄄basedalloyinglayerwaspreparedbyaduplexsurfacetreatmentonthe surfaceofAISI316Lstainlesssteel.ThissteelcontainedNi/nano鄄SiO 2 orNi/nano鄄SiClayerwhichwaspredeposited bybrushplatingandsubsequentsurfacealloyingwithNi鄄Cr鄄Mo鄄Cubyadoubleglowprocess.Themicrostructuresof thetwokindsofnanoparticlesthatreinforcedtheNi鄄basedalloyinglayerswereinvestigatedbyscanningelectron microscopy(SEM)andtransmissionelectronmicroscopy(TEM).Thecorrosionbehaviorsofthecompositelayersunder hydrodynamicconditionsandatdifferentrotationalspeedswerecharacterizedbycurrentresponsesatapotentialof+0.2 V,apotentiodynamicpolarizationcurveandelectrochemicalimpedancespectroscopy(EIS)underastaticstate(3.5%(w, massfraction)NaClsolution)andunderslurryflowconditions(3.5%(w)NaClsolution+10%(w)sandparticles).To assesspossibleerosion鄄corrosionmechanisms,thewornsamplesurfaceswereobservedbySEM.Electrochemicaltests showedthatthecorrosionresistanceofthecompositelayerwiththebrushplatedNi/nano鄄SiO 2 particleinterlayerwas slightlylowerthanthatofthesingleNi鄄basedalloyinglayerproducedunderstaticstateconditions.However,under hydrodynamicconditions,thecorrosionresistanceofthecompositelayerwiththebrushplatedNi/nano鄄SiO 2 particle interlayerwasobviouslysuperiortothatofthesingleNi鄄basedalloyinglayer.Thecorrosionresistanceofthe compositelayerproducedwiththebrushplatedNi/nano鄄SiCparticleinterlayerwaslowerthanthatofthesingleNi鄄