The Influence of Galvanic Current on Cerium-Based Conversion Coatings on Mg, Al, and Galvanized Steel Couples
Abstract
The influence of galvanic current on cerium-Based conversion coatings (CeCCs) for magnesium (AZ91, AZ31), aluminum (6016), and electro-galvanized steel (EGS) couples has been studied using zero resistance ammeter (ZRA) measurements in prohesion solution. the galvanic current measured between magnesium-aluminum, magnesium-galvanized steel, and aluminum-galvanized steel couples correlated with significant changes in coating morphology and deposition rate. the ZRA galvanic currents (mA) were 0.02 for 6016-EGS, 0.38 for AZ91-EGS, 0.72 for AZ91-6016, 1.08 for AZ31-EGS, and 1.08 for AZ31-6016 couples. the corrosion performance of the coated couples was evaluated by ASTM B117 neutral salt spray testing. Cerium conversion coated couples performed better in salt spray testing compared to uncoated couples. the correlation of galvanic current, cerium deposition, and corrosion performance will be discussed.
Recommended Citation
S. Maddela et al., "The Influence of Galvanic Current on Cerium-Based Conversion Coatings on Mg, Al, and Galvanized Steel Couples," Magnesium Technology, pp. 235 - 239, Springer, Jan 2012.
The definitive version is available at https://doi.org/10.1007/978-3-319-48203-3_44
Department(s)
Materials Science and Engineering
Keywords and Phrases
AZ31 and AZ91D corrosion; Bimetallic couples; Mg alloy coating; Zero resistance ammeter
International Standard Book Number (ISBN)
978-111829121-4
International Standard Serial Number (ISSN)
1545-4150
Document Type
Article - Conference proceedings
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2024 Springer, All rights reserved.
Publication Date
01 Jan 2012
