Evaluation of the anticorrosive behaviour of organic coatings applied on galvanised steel surfaces

Kouloumbi, N; Tsangaris, GM; Nitodas, S; Kyvelidis, S

dc.contributor.author	Kouloumbi, N	en
dc.contributor.author	Tsangaris, GM	en
dc.contributor.author	Nitodas, S	en
dc.contributor.author	Kyvelidis, S	en
dc.date.accessioned	2014-03-01T01:13:44Z
dc.date.available	2014-03-01T01:13:44Z
dc.date.issued	1998	en
dc.identifier.issn	1356-0751	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/12695
dc.subject	Current Density	en
dc.subject	Dielectric Loss	en
dc.subject	Water Uptake	en
dc.subject	Zinc	en
dc.subject.classification	Chemistry, Applied	en
dc.subject.classification	Engineering, Chemical	en
dc.subject.classification	Materials Science, Coatings & Films	en
dc.title	Evaluation of the anticorrosive behaviour of organic coatings applied on galvanised steel surfaces	en
heal.type	journalArticle	en
heal.identifier.primary	10.1007/BF02757998	en
heal.identifier.secondary	http://dx.doi.org/10.1007/BF02757998	en
heal.language	English	en
heal.publicationDate	1998	en
heal.abstract	A zinc layer on a steel surface combined with on organic coating (duplex system) offers highly effective protection against corrosion. The zinc layer prevents the oxidation of the steel by being sacrificed onodicolly. The additional system of paints prevents the penetration of humidity and the general contamination of the galvanised surface during exposure to intensely corrosive atmospheres. In this work galvanised steel specimens were coated with the following four different systems of organic coatings: System 1 (two layers): Wash Primer + Coal tar epoxy; System 2 (one layer): Coal tar epoxy; System 3 (three layers): Wash Primer + Zinc rich epoxy + epoxy paint; System 4 (two layers): Zinc rich epoxy + epoxy point. The corrosion behaviour of these specimens in 3.5% w/w NaCl was investigated by Electrochemical Impedance Spectroscopy (EIS), monitoring of the corrosion potential, potentiodynamic polarization measurements and dielectric measurements. Also, their behaviour in a salt spray chamber was monitored. Uncooted specimens of galvanised steel were used as reference specimens. Results of EIS and dielectric measurements were fitted to advanced models for the prediction of the changes in the parameters that characterise the anticorrosive behaviour of the organic coatings. Interrelation of the obtained results shows that the four coating systems offer more protection than simple galvanising. Systems 1 ond 2 demonstrate better anticorrosive behaviour than systems 3 and 4.	en
heal.publisher	OIL COLOUR CHEM ASSN	en
heal.journalName	Surface Coatings International Part B: Coatings International	en
dc.identifier.doi	10.1007/BF02757998	en
dc.identifier.isi	ISI:000165533300004	en
dc.identifier.volume	81	en
dc.identifier.issue	1	en
dc.identifier.spage	30	en
dc.identifier.epage	36	en