Electroless Ni-P-TiO2 composites vacuum heated: Preparation and characterization

Novakovic, J; Vassiliou, P; Dervos, CT

dc.contributor.author	Novakovic, J	en
dc.contributor.author	Vassiliou, P	en
dc.contributor.author	Dervos, CT	en
dc.date.accessioned	2014-03-01T02:51:37Z
dc.date.available	2014-03-01T02:51:37Z
dc.date.issued	2008	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/35589
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-84865039156&partnerID=40&md5=c342a1c4c6e17091b2a3261a3ddd1bef	en
dc.subject	Composite	en
dc.subject	Corrosion resistance	en
dc.subject	Electroless Ni-P	en
dc.subject	Hardness	en
dc.subject	TiO2	en
dc.subject.other	Amorphous structures	en
dc.subject.other	Bath concentrations	en
dc.subject.other	Chemical reduction	en
dc.subject.other	Codeposition	en
dc.subject.other	Corrosion-resistant coating	en
dc.subject.other	Crystalline layers	en
dc.subject.other	Electroless	en
dc.subject.other	Electroless Ni-P	en
dc.subject.other	Electroless nickel plating	en
dc.subject.other	Ni-P coating	en
dc.subject.other	Nickel matrix	en
dc.subject.other	Potentiodynamic polarization measurements	en
dc.subject.other	Sodium chloride solution	en
dc.subject.other	Steel substrate	en
dc.subject.other	TiO	en
dc.subject.other	Vacuum heat treatment	en
dc.subject.other	Composite coatings	en
dc.subject.other	Composite materials	en
dc.subject.other	Corrosion prevention	en
dc.subject.other	Corrosion resistance	en
dc.subject.other	Crystalline materials	en
dc.subject.other	Deposits	en
dc.subject.other	Electroless plating	en
dc.subject.other	Hardness	en
dc.subject.other	Nanocomposite films	en
dc.subject.other	Nickel	en
dc.subject.other	Nickel plating	en
dc.subject.other	Optical microscopy	en
dc.subject.other	Scanning electron microscopy	en
dc.subject.other	Sodium chloride	en
dc.subject.other	Suspensions (fluids)	en
dc.subject.other	Titanium	en
dc.subject.other	Vacuum	en
dc.subject.other	X ray diffraction	en
dc.subject.other	Titanium dioxide	en
dc.title	Electroless Ni-P-TiO2 composites vacuum heated: Preparation and characterization	en
heal.type	conferenceItem	en
heal.publicationDate	2008	en
heal.abstract	Electroless nickel plating has been an elegant method of producing corrosion-resistant coatings without the use of eternal electric current, by chemical reduction on different surfaces. Composite coatings can also be produced by codeposition of powders in the nickel matrix. Composite NiP-TiO2 layers were prepared by simultaneous electroless deposition of Ni-P and TiO2 on steel substrate, from a solution in which TiO2 particles were kept in suspension by stirring. Deposits were characterized for its structure, morphology and hardness by optical microscopy, scanning electron microscopy and microanalysis and X-ray diffraction. It was found that TiO2 particle incorporation increases with their increase in the bath concentrations (0.5-2.0 g/l). An improvement (up to 20 %) in microhardness was observed in both as plated and vacuum heat-treated composite coatings compared to Ni-P coatings. Electroless deposited composite coatings exhibit an amorphous structure of the nickel matrix in which crystalline titanium oxide is incorporated. Vacuum heat treatment leads to the formation of a crystalline layer in which the Ni and Ni3P crystallites appear apart from those of the TiO2 (anatase). Potentiodynamic polarization measurements made on these deposits in 3.5 wt.% sodium chloride solution showed decrease in the corrosion resistance for the heat-treated composite coatings. © 2009 by NACE International.	en
heal.journalName	17th International Corrosion Congress 2008: Corrosion Control in the Service of Society	en
dc.identifier.volume	2	en
dc.identifier.spage	1055	en
dc.identifier.epage	1065	en