Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1471654 | Corrosion Science | 2008 | 9 Pages |
Abstract
The magnesium levels in 20 μm thick 4.5% Al/Zn galvanising coatings applied to 0.7 mm gauge steel under continuous galvanising conditions were altered from 0.0% to 0.05%. The additions result in an increase in the zinc dendrites (volume fraction from 6% to 22% and number from 150 to 325 mm−2) since magnesium depresses the eutectic temperature increasing the freezing range. The microstructural modification results in increasing cut edge corrosion determined using a scanning vibrating electrode technique for 24 h exposure to 5% NaCl. The Mg additions result in an increase in zinc loss (from 80 to 185 μg), an increase in active anode numbers (from 600 to 1700 m−1 cut edge) and an increase in the number of long lived anodes.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Jonathan Elvins, John A. Spittle, James H. Sullivan, David A. Worsley,