Van Deun, Rik

Van Hecke, Kristof

Verdonck, Tim

Verpoort, P

Ghent University Academic Bibliography

The ‘complex’ route to sustainable Cr(VI)-free steel plating  T. Verdonck1,2,3, P. Verpoort2, R. Van Deun3, K. Van Hecke1 Tim.Verdonck@UGent.be	1XStruct,	Ghent	University,	Krijgslaan	281-S3,	B-9000	Ghent,	Belgium	2OCAS	nv,	Pres.	J.F.	Kennedylaan	3,	B-9060	Zelzate,	Belgium	3L3	-	Luminescence	Lanthanide	Lab,	Ghent	University,	Krijgslaan	281-S3,	B-9000	Ghent,	Belgium	1 - INTRODUCTION• In	various	 industries,	 steel	 components	need	to	be	protected	from	the	harsh	conditions	• Very	 often,	 this	 is	 done	 by	 coating	 the	components	with	a	hard	chromium	layer	• The	 layer	 is	 typically	 electrodeposited	 from	an	aqueous	solution	containing	the	toxic	and	carcinogenic	Cr(VI)• OCAS	 NV	 is	 working	 on	 a	 sustainable	 Cr(VI)-free	alternative,	using	a	patented	Cr(III)-based	deep-eutectic	 solvent	 (DES)	 as	 electrolyte1.	However,	 there	 sti l l	 exists	 a	 lack	 of	fundamental	 knowledge	 on	 the	 deposition	mechanism• This	project	 focuses	on	 the	elucidation	of	 the	coordination	chemistry	of	the	Cr(III)-species	in	the	DES	as	a	 function	of	composition	and	the	presence	 of	 additives	 to	 predict	 the	 in-use	properties	of	the	hard	chromium	layer.2 - GOAL• ‘Pure’	absorption	spectra	of	all	possible	Cr(III)	species	which	are	expected	in	various	DES	• Use	of	these	model	spectra	to	study	the	DES	in	more	detailDeep-eutectic solventA BCheap ionic liquid alternativeQuaternary ammonium salt Hydrogen bond donor or metal salt +CrCl3·6H2O1. Abboa,	A.	P.,	Frisch,	G.	&	Ryder,	K.	S.	Electropladng	Using	Ionic	Liquids.	Annu.	Rev.	Mater.	Res.	43,	335–358	(2013).	2. Elving,	P.	J.	&	Zemel,	B.	Absorpdon	in	the	Ultraviolet	and	Visible	Regions	of	Chloroaquochromium(III)	Ions	in	Acid	Media.	J.	Am.	Chem.	Soc.	79,	1281–1285	(1957).	3. Jaumot,	J.,	de	Juan,	A.	&	Tauler,	R.	MCR-ALS	GUI	2.0:	New	features	and	applicadons.	Chemom.	Intell.	Lab.	Syst.	140,	1–12	(2015).	3 - RESULTSUV/Vis	 model	 spectra	 were	obtained	from	literature2,	by	ion	exchange	 chromatography	 and	MCR-ALS3.	Pure	 spectra	 of	 Cr(III)	 complexes	from	 acidic	 aqueous	 solutions	 by	ion	exchange	chromatographyPhilip	 Elving	 synthesized	 3	 (+1)	possible	Cr(III)	complexes	 in	acidic	solutions	and	recorded	the	UV/Vis	spectra2:MCR-ALSDeconvolution	of	series	of	continuously	changing	spectra	into	their	pure	contributions	and	concentration	profiles407 nm 575 nm430 nm 605 nm450 nm 635 nm475 nm 665 nmINPUTINPUTOUTPUTMultivariate	Curve	Resolution	Alternating	Least	Squares	(MCR-ALS)3:OUTPUT“Pure”	spectraConcentration	profilesLegend:Application: “Ternary	Coordination	Diagram”?Also	studied	by	EXAFS410 nm 576 nm431 nm 608 nm452 nm 635 nm474 nm 670 nm489 nm 684 nmAverage	peak	maxima	of	every	complex:{

The 'complex' route to sustainable Cr(VI)-free steel plating

https://biblio.ugent.be/publication/8567206/file/8567208

The 'complex' route to sustainable Cr(VI)-free steel plating

Abstract

Similar works

Full text

Available Versions

Ghent University Academic Bibliography