Modification of zinc powder to improve the corrosion resistance of weldable primers

authors	Bastos, AC; Zheludkevich, ML; Kluppel, I; Grundmeier, G; Ferreira, MGS
nationality	International
journal	PROGRESS IN ORGANIC COATINGS
author keywords	Weldable primers; Coil-coatings; EIS; SVET; Corrosion; Zinc powder
keywords	METALS
abstract	This paper reports the modification of zinc powder to improve the corrosion resistance of weldable primers. These primers are thin zinc rich organic coatings applied by roll coating at the steel manufacturer. The automotive industry uses them to protect areas in the car body that become inaccessible after joining processes. In this work, with the objective of increasing the corrosion resistance of these systems, the zinc particles were chemically treated or simply replaced by powder of 55AlZn alloy. The rest of the formulation remained intact. The performance of the commercial and modified formulations was compared by SEM, SVET and EIS. The best results were obtained when the zinc powder was replaced by powder of the aluminium zinc alloy. (C) 2010 Elsevier B.V. All rights reserved.
publisher	ELSEVIER SCIENCE SA
issn	0300-9440
year published	2010
volume	69
issue	2
beginning page	184
ending page	192
digital object identifier (doi)	10.1016/j.porgcoat.2010.04.021
web of science category	Chemistry, Applied; Materials Science, Coatings & Films
subject category	Chemistry; Materials Science
unique article identifier	WOS:000281937000011