Universität zu Köln

Saini, Vimal, von Tapavicza, Max, Eloo, Christina, Braesch, Katrin, Wack, Holger, Nellesen, Anke, Schmidt, Annette M. and Garcia, Santiago J. (2018). Superabsorbent polymer additives for repeated barrier restoration of damaged powder coatings under wet-dry cycles: A proof-of-concept. Prog. Org. Coat., 122. S. 129 - 138. LAUSANNE: ELSEVIER SCIENCE SA. ISSN 0300-9440

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Abstract

Superabsorbent polymers (SAPs) are well known for their ability to absorb and hold high water amounts accompanied by a high volume expansion. In this work we show the benefits of this underlying property of SAPs to induce underwater crack closure with subsequent barrier restoration in damaged protective coatings. For the proof of concept, three layer epoxy-polyester (EP) powder coating systems were developed and applied on carbon steel. In these systems the middle EP layer (also called functional layer) contained crosslinked acrylamide/acrylic acid copolymer SAPs in different amounts ranging from 0 to 40 wt%. The capability of the SAPs to close damages and extend barrier and corrosion protection was evaluated by electrochemical impedance spectroscopy (EIS), NaCl aqueous solution immersion test and optical microscopy. It was found that coatings loaded with a 20 wt% SAP led to the best overall corrosion protection for the studied systems. In order to proof the potential use of this extrinsic healing concept for multiple healing events wet-dry cycles on scratched systems were performed and the corrosion performance was followed by EIS. Although not yet optimal, the results show the potential of the concept for multiple healing events under wet-dry conditions.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Saini, Vimal UNSPECIFIED UNSPECIFIED UNSPECIFIED von Tapavicza, Max UNSPECIFIED UNSPECIFIED UNSPECIFIED Eloo, Christina UNSPECIFIED UNSPECIFIED UNSPECIFIED Braesch, Katrin UNSPECIFIED UNSPECIFIED UNSPECIFIED Wack, Holger UNSPECIFIED UNSPECIFIED UNSPECIFIED Nellesen, Anke UNSPECIFIED UNSPECIFIED UNSPECIFIED Schmidt, Annette M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Garcia, Santiago J. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-173876
DOI:	10.1016/j.porgcoat.2018.05.019
Journal or Publication Title:	Prog. Org. Coat.
Volume:	122
Page Range:	S. 129 - 138
Date:	2018
Publisher:	ELSEVIER SCIENCE SA
Place of Publication:	LAUSANNE
ISSN:	0300-9440
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language CEMENTITIOUS MATERIALS; CORROSION PROTECTION; EIS Multiple languages Chemistry, Applied; Materials Science, Coatings & Films Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/17387