Article ID Journal Published Year Pages File Type
1471877 Corrosion Science 2007 11 Pages PDF
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
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