Cracking mechanisms in high temperature hot-dip galvanized coatings

Tzimas, E; Papadimitriou, G

dc.contributor.author	Tzimas, E	en
dc.contributor.author	Papadimitriou, G	en
dc.date.accessioned	2014-03-01T01:51:07Z
dc.date.available	2014-03-01T01:51:07Z
dc.date.issued	2001	en
dc.identifier.issn	0257-8972	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/26228
dc.subject	hot-dip galvanizing	en
dc.subject	bending	en
dc.subject	fracture	en
dc.subject.classification	Materials Science, Coatings & Films	en
dc.subject.classification	Physics, Applied	en
dc.subject.other	METAL-CERAMIC INTERFACES	en
dc.subject.other	RESIDUAL-STRESSES	en
dc.subject.other	BIMATERIAL INTERFACE	en
dc.subject.other	BRITTLE FILMS	en
dc.subject.other	THIN-FILMS	en
dc.subject.other	BEHAVIOR	en
dc.subject.other	DELAMINATION	en
dc.subject.other	DECOHESION	en
dc.subject.other	SYSTEM	en
dc.title	Cracking mechanisms in high temperature hot-dip galvanized coatings	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	2001	en
heal.abstract	The cracking behavior of hot-dip galvanized coatings produced by immersion in a pure zinc bath at 560 degreesC is investigated after 3-point bending tests. Microcracks formed in the as-produced delta (1) phase as a result of tensile residual stresses developed during processing act as nucleation sites for cracks formed during bending. These cracks follow a Mode I path, normal to the substrate/coating interface, are arrested at the Gamma/delta (1), interface and continue to propagate parallel to the coating/substrate interface resulting in the delamination and failure of the coatings. Measurements of crack population followed by statistical analysis show that the density of cracks formed during bending in the coating is independent of coating thickness and depends on the applied strain, indicating that crack density is not controlled by crack initiation, but by crack propagation. It is also shown that the density of cracks that reach the surface of the coating depends only on the thickness of the outer Zn-rich layers of the coating that act as barriers to crack propagation. (C) 2001 Elsevier Science B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE SA	en
heal.journalName	SURFACE & COATINGS TECHNOLOGY	en
dc.identifier.isi	ISI:000171172600024	en
dc.identifier.volume	145	en
dc.identifier.issue	1-3	en
dc.identifier.spage	176	en
dc.identifier.epage	185	en