Novel corrosion-resistant films for Mg alloys

Yfantis, A; Paloumpa, I; Schmeisser, D; Yfantis, D

dc.contributor.author	Yfantis, A	en
dc.contributor.author	Paloumpa, I	en
dc.contributor.author	Schmeisser, D	en
dc.contributor.author	Yfantis, D	en
dc.date.accessioned	2014-03-01T01:18:06Z
dc.date.available	2014-03-01T01:18:06Z
dc.date.issued	2002	en
dc.identifier.issn	0257-8972	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/14802
dc.subject	Coating	en
dc.subject	Corrosion inhibition	en
dc.subject	Magnesium	en
dc.subject	Polyacrylic	en
dc.subject	Polypyrrole	en
dc.subject.classification	Materials Science, Coatings & Films	en
dc.subject.classification	Physics, Applied	en
dc.subject.other	Chemisorption	en
dc.subject.other	Corrosion inhibitors	en
dc.subject.other	Corrosion resistance	en
dc.subject.other	Emulsion polymerization	en
dc.subject.other	Oligomers	en
dc.subject.other	Semiconductor doping	en
dc.subject.other	Synthesis (chemical)	en
dc.subject.other	Thick films	en
dc.subject.other	Thin films	en
dc.subject.other	Corrosion rates	en
dc.subject.other	Magnesium alloys	en
dc.subject.other	corrosion protection	en
dc.subject.other	film	en
dc.subject.other	magnesium alloy	en
dc.subject.other	polypyrrole	en
dc.title	Novel corrosion-resistant films for Mg alloys	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0257-8972(01)01654-1	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0257-8972(01)01654-1	en
heal.language	English	en
heal.publicationDate	2002	en
heal.abstract	A novel method for the corrosion inhibition of Mg, alloys, based on the formation of a thin polyacrylic-polypyrrole film, is presented. The film was created after simple immersion of the samples in a specially formulated emulsion of polyacrylic and polypyrrole polymers. The synthesis conditions were studied, as well as the resulting corrosion resistance of coated magnesium foils (AZ31) in terms of corrosion rate in neutral aqueous NaCl solutions. The relative ratio of polyacrylic polymer to polypyrrole was found to be important for the film properties. Furthermore, only in situ polymerisation of pyrrole in the polyacrylic emulsion can provide advanced corrosion proper-ties in relatively thin films (2-5 mum). Blending of polypyrrole powder with the polyacrylic emulsion gives rise to thick films (20 mum) with reduced corrosion-inhibition properties. The corrosion rate was only weakly dependent on the film thickness of these novel coatings. We argue that the mechanism of corrosion inhibition is related to the formation of a thin passive layer of chemisorbed polypyrrole polymers or oligomers on the native magnesium oxide of the C surface. The structure is further stabilised by polyacrylic polymer chains interacting as dopants of polypyrrole. The method is environmentally friendly: non-toxic chemicals are used, no rinsing is required, etc. The advanced corrosion-inhibition properties of the films. as well as the simple application process on the metal surface, provide significant potential for the industrial application of the method. (C) 2002 Elsevier Science B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE SA	en
heal.journalName	Surface and Coatings Technology	en
dc.identifier.doi	10.1016/S0257-8972(01)01654-1	en
dc.identifier.isi	ISI:000174011400079	en
dc.identifier.volume	151-152	en
dc.identifier.spage	400	en
dc.identifier.epage	404	en