ALUMINUM DEPOSITS ON 42CD4 STEEL SUBSTRATES BY MOLTEN-SALTS ELECTROLYSIS

KALOGEROPOULOU, S; CHRYSSOULAKIS, Y; GREGOIRE, L; MOORTGAT, G

dc.contributor.author	KALOGEROPOULOU, S	en
dc.contributor.author	CHRYSSOULAKIS, Y	en
dc.contributor.author	GREGOIRE, L	en
dc.contributor.author	MOORTGAT, G	en
dc.date.accessioned	2014-03-01T01:42:02Z
dc.date.available	2014-03-01T01:42:02Z
dc.date.issued	1993	en
dc.identifier.issn	0360-3164	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/23688
dc.subject.classification	Metallurgy & Metallurgical Engineering	en
dc.subject.classification	Materials Science, Coatings & Films	en
dc.subject.other	CURRENT METAL ELECTRODEPOSITION	en
dc.subject.other	FUNDAMENTAL-ASPECTS	en
dc.subject.other	PULSATING CURRENT	en
dc.subject.other	SWEEP VOLTAMMETRY	en
dc.title	ALUMINUM DEPOSITS ON 42CD4 STEEL SUBSTRATES BY MOLTEN-SALTS ELECTROLYSIS	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1993	en
heal.abstract	Electrolytic deposition of aluminum on 42CD4 steel substrates, from a KCl-LiCl eutectic melt with AlCl3 additions at 600-degrees-C, has been studied in order to improve surface properties and corrosion resistance under aggressive gaseous atmospheres. A detailed study of the aluminum reduction mechanism was carried out using the electrochemical methods of linear sweep voltammetry, cathodic chronopotentiometry and cathodic chronoamperometry. The solid state diffusion coefficient of the aluminum into the steel substrate was evaluated using cathodic chronoamperometry and was found to be D(Al) = 1.8 x 10(-11) cm2/sec. From the mechanism found by the electrochemical reaction study, the experimental parameters could be adjusted in order to obtain in a reproducible way a homogeneous, aluminum-rich surface layer of regular thickness on steel electrodes. The best results were obtained using square wave pulses with the following set of parameters: pulse amplitude i(p) = -80 mA/cm2, pulse duration t(p) = 0.5 sec, and relaxation time t(r) = 2 sec. Electron microprobe analysis showed that the electrodeposits obtained consisted of the solid compound, Fe2Al5. Microhardness measurements of the electrocoated samples showed that their superficial microhardness, as much as 950 Vickers, was improved compared to samples treated by classical methods (650 to 750 Vickers), such as nitriding, boriding or carburizing.	en
heal.publisher	AMER ELECTROPLATERS SOC INC	en
heal.journalName	PLATING AND SURFACE FINISHING	en
dc.identifier.isi	ISI:A1993LQ44600007	en
dc.identifier.volume	80	en
dc.identifier.issue	8	en
dc.identifier.spage	28	en
dc.identifier.epage	33	en