Mechanistic investigation on the influence of coating weights on the corrosion behaviour of hot-dip-galvanised Zn-Mg-Al coatings-Reference-Cited by-同舟云学术

Mechanistic investigation on the influence of coating weights on the corrosion behaviour of hot-dip-galvanised Zn-Mg-Al coatings

Published:2024-07-29 Issue:1 Volume:8 Page:
ISSN:2397-2106
Container-title:npj Materials Degradation
language:en
Short-container-title:npj Mater Degrad

Author:

Malla A. D.^ORCID,Sullivan J. H.,Penney D. J.,Goldsworthy M.,Britton D.^ORCID,Williams G.^ORCID,Goodwin F.^ORCID,Cardoso A. P.^ORCID

Abstract

AbstractTime-lapse Microscopy, scanning vibrating electrode technique and potentiodynamic methods were used to study the influence of increasing coating weight (80–310 gm–2) on microstructure, cut-edge and surface corrosion of Zn-Mg-Al coatings in 0.17 M NaCl. Cut-edge corrosion was similar for all coatings due to the oxygen reduction reaction becoming diffusion-limited. A 64% reduction in surface corrosion was observed for high coating weights through increases in eutectic volume fraction. Spatial and temporal corrosion mechanisms were controlled by microstructural morphological differences as coating weight varied. 80 g.m–2 coatings demonstrated lateral anodic spreading potentially reducing coating penetration rates despite their higher surface corrosion rate.

Funder

International Zinc Association

Publisher

Springer Science and Business Media LLC

Link

https://www.nature.com/articles/s41529-024-00494-2.pdf

Reference41 articles.

1. Marder, A. R. The metallurgy of zinc-coated steel. Prog. Mater. Sci. 45, 191–271 (2000).

2. Perkins, J. & Bornholdt, R. A. The corrosion product morphology found on sacrificial zinc anodes. Corros. Sci. 17, 377–384 (1977).

3. Marder, A. R. & Goodwin, F. E. The Metallurgy of Zinc Coated Steels. The Metallurgy of Zinc Coated Steels https://doi.org/10.1016/C2020-0-04502-0 (2023).

4. Elvins, J., Spittle, J. A. & Worsley, D. A. Microstructural changes in zinc aluminium alloy galvanising as a function of processing parameters and their influence on corrosion. Corros. Sci. 47, 2740–2759 (2005).

5. Raja, V. S., Panday, C. K., Saji, V. S., Vagge, S. T. & Narasimhan, K. An electrochemical study on deformed galvanneal steel sheets. Surf. Coatings Technol. https://doi.org/10.1016/j.surfcoat.2006.03.044 (2006).