Textural modifications in nickel electrodeposition under pulse reserved current

Kollia, C; Spyrellis, N

dc.contributor.author	Kollia, C	en
dc.contributor.author	Spyrellis, N	en
dc.date.accessioned	2014-03-01T01:09:34Z
dc.date.available	2014-03-01T01:09:34Z
dc.date.issued	1993	en
dc.identifier.issn	0257-8972	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/11088
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0027578078&partnerID=40&md5=1e1ecaa4b7d863c8931045866b22f31c	en
dc.subject.classification	Materials Science, Coatings & Films	en
dc.subject.classification	Physics, Applied	en
dc.subject.other	Composition	en
dc.subject.other	Crystal growth	en
dc.subject.other	Crystal microstructure	en
dc.subject.other	Crystal orientation	en
dc.subject.other	Dissolution	en
dc.subject.other	Electrolysis	en
dc.subject.other	Electrolytes	en
dc.subject.other	Grain size and shape	en
dc.subject.other	Interfaces (materials)	en
dc.subject.other	Nickel	en
dc.subject.other	Surfaces	en
dc.subject.other	Textures	en
dc.subject.other	Crystallites	en
dc.subject.other	Duty cycle	en
dc.subject.other	Electrocrystallization	en
dc.subject.other	Nickel electrodeposits	en
dc.subject.other	Pulse frequency	en
dc.subject.other	Pulsed reversed current (PRC) technique	en
dc.subject.other	Watts type bath	en
dc.subject.other	Electrodeposition	en
dc.title	Textural modifications in nickel electrodeposition under pulse reserved current	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1993	en
heal.abstract	Nickel electrodeposits consists of crystallites whose orientation, microstructure and size depend on the electrolytic conditions. Study of the mechanism of nickel electrocrystallization has indicated that the oriented growth observed is determined by the specific inhibition exerted by the chemical species which exist or are formed on the metal-electrolyte interface (catholyte) and which are selectively absorbed on the continually renewed metal surface. The pulse reversed current (PRC) technique was used to perturb the electrocrystallization process and hence to change the texture and the structural characteristics of nickel electrodeposits. The strucrtural changes that occur in deposit orientation under PRC conditions were studied. Nickel electrodeposition was realized from a Watts-type bath on a rotated cathode, and the electrolysis parameters (current density, rotation velocity, electrolyte pH and temperature) were chosen in such a way that using direct current they led to the preparation of perfectly [100], [211], [210], [110]A and [110]B textured deposits. The deposit texture was determined by X-ray diffractometry and the results are summarized in texture diagrams given as a function of PRC parameters: pulse frequency and duty cycle. It was proved that the texture is directly related to PRC parameters, which provoke strong perturbation in the crystal growth process. This phenomenon is reinforced when both the pulse frequency and the duty cycle are small. The PRC technique affects the nickel electrocrystallization process according to a mechanism analogous to the action of organic additives under direct current conditions by intervening in the catholyte composition and hence in the adsorption-desorption phenomena occuring at the metal-solution interface during the dissolution and the deposition time. © 1993.	en
heal.publisher	ELSEVIER SCIENCE SA LAUSANNE	en
heal.journalName	Surface and Coatings Technology	en
dc.identifier.isi	ISI:A1993KZ83600010	en
dc.identifier.volume	57	en
dc.identifier.issue	1	en
dc.identifier.spage	71	en
dc.identifier.epage	75	en