Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1471877 | Corrosion Science | 2007 | 11 Pages |
Abstract
The electrochemical behaviour of permanganate-based no-rinse conversion coatings on AA3003-H14 aluminium alloy shows that they have promise as an alternative to toxic chromate-based coatings. A selection of inorganic additions has been made here to a simple 0.1 M KMnO4 formulation investigated previously. The performance of the different coatings has been evaluated from potential–time and polarisation measurements in 0.5 wt % (0.085 M) NaCl solution for periods up to 3 days. The addition of fluoride ions produced no benefit, whereas Al(NO3)3 shows an improvement when added in small amounts. Tests with the individual ions reveal that it is Al3+ cations, rather than NO3- anions, which produce the greatest benefit.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
I. Danilidis, J. Hunter, G.M. Scamans, J.M. Sykes,