Chromate leaching from inhibited primers: Part I. Characterisation of leaching |
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Authors: | FH Scholes SA Furman AE Hughes T Nikpour N Wright PR Curtis CM Macrae S Intem AJ Hill |
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Affiliation: | 1. CSIRO Manufacturing and Infrastructure Technology, Private Bag 33, Clayton South MDC 3169, Australia;2. CSIRO Minerals, Box 312, Clayton South 3169, Australia;3. Ecole Polytechnique de l’université de Nantes, Rue Christian Pauc, BP 90604, 44306 Nantes, France |
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Abstract: | Leaching and characterisation studies have been undertaken on two chromate-inhibited epoxy polyamide primers. Leaching was carried out in 5% (w/v) NaCl solutions at different pH values (1, 3, 5 and 7) and the amount of Cr released into solution was monitored over time. Cr release was initially high, but as the immersion time increased the leaching from the primers slowed. Prior to and after immersion, the primers were characterised by a number of techniques including electron microprobe analysis, X-ray microdiffraction, Raman spectroscopy, and positron annihilation lifetime spectroscopy. The unexposed primers were found to contain the inorganic phases SrCrO4, BaSO4 and TiO2 (anatase or rutile). Upon immersion, water uptake by the primers was observed, together with a decrease in the amount of SrCrO4 in the primers. These studies provide insights into the mechanism of chromate leaching from inhibited primers. |
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Keywords: | Coatings Primers Chromate Leaching Corrosion |
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