Nickel electrocrystallization: Influence of unsaturated organic additives on the mechanism of oriented crystal growth

Macheras, J; Vouros, D; Kollia, C; Spyrellis, N

dc.contributor.author	Macheras, J	en
dc.contributor.author	Vouros, D	en
dc.contributor.author	Kollia, C	en
dc.contributor.author	Spyrellis, N	en
dc.date.accessioned	2014-03-01T01:12:08Z
dc.date.available	2014-03-01T01:12:08Z
dc.date.issued	1996	en
dc.identifier.issn	0020-2967	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/11959
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0030104639&partnerID=40&md5=a996ca67b69106c63777527b7ad802cc	en
dc.subject.classification	Metallurgy & Metallurgical Engineering	en
dc.subject.classification	Materials Science, Coatings & Films	en
dc.subject.other	Additives	en
dc.subject.other	Adsorption	en
dc.subject.other	Crystal growth	en
dc.subject.other	Electrodeposition	en
dc.subject.other	Hydrogenation	en
dc.subject.other	Molecules	en
dc.subject.other	Organic compounds	en
dc.subject.other	Surfaces	en
dc.subject.other	Electrocrystallization	en
dc.subject.other	Electrolytic baths	en
dc.subject.other	Phenyl propyl alcohol	en
dc.subject.other	Stereochemical structure	en
dc.subject.other	Unsaturated organic additives	en
dc.subject.other	Nickel	en
dc.title	Nickel electrocrystallization: Influence of unsaturated organic additives on the mechanism of oriented crystal growth	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1996	en
heal.abstract	The addition of organic compounds to the electrolytic baths during the electrodeposition of metals affects the structure and the properties of the deposits, leading to the preparation of coatings with defined characteristics. In this work, a complete study of the action of the organic additives on the crystalline orientation of the nickel electrodeposits was carried out. The selection of the organic compounds was made in order to investigate the effect of the stereochemical structure and unsaturated bonds on the nickel electrocrystallization process. It was found that the presence of acetylenic compounds (butyne-2-diol 1,4 and propyne-2-ol) in nickel plating baths leads to the predominance of high inhibited modes of crystal growth. Propyne-2-ol seems to be more active, as the geometry of its molecule favours the adsorption of the additive on the metallic surface and, thus, its faster hydrogenation. With the additon of phenyl propyl alcohol, a strong perturbation of the oriented crystal growth of the nickel crystallites occurs. The adsorption of the phenyl group on the metallic surface and its hydrogenation is responsible for the predominance of high inhibited textures. In the case of coumarin, the complexity of its molecule makes its adsorption more difficult, resulting in the development of [100] textured deposits even at high concentrations of the additive. Finally, when sodium benzene sulphonate or saccharin are added to the bath, the presence of sulphur in their molecules influences the nickel electrodeposition process through a different mechanism.	en
heal.publisher	INST METAL FINISHING	en
heal.journalName	Transactions of the Institute of Metal Finishing	en
dc.identifier.isi	ISI:A1996UF46200008	en
dc.identifier.volume	74	en
dc.identifier.issue	2	en
dc.identifier.spage	55	en
dc.identifier.epage	58	en