Critical Issues for Chrome-free Pretreatment of Aluminium Alloys

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Critical Issues for Chrome-free Pretreatment of Aluminium Alloys Testing • Most useful information has been derived from carefully monitored sets of test panels on exposure sites (FICARP, Alcan, TNO/ECCA) • The results of these studies correlate well with the results of filiform corrosion tests and with certain cyclic corrosion tests like the TNO test. • The is generally poor correlation with the results of acidified salt spray tests either in terms of performance ranking or in the observed mode of corrosion. Low temperature ASS testing can provide good results although panels often develop filiform after removal from the test cabinet. • Generally tests derived for steel substrates are not appropriate for aluminium. • A simple form of filiform testing has been developed that can be used to optimise alloy and process route selection and to tune cleaning treatments • The exposure site condition is not reproduced in most cabinet based corrosion tests. International Conference on Environmental friendly Pretreatments fo Aluminium and other Metals, Oslo, Norway, June 16-18, 2004
Critical Issues for Chrome-free Pretreatment of Aluminium Alloys Hoek van Holland Exposure Site Results for Lightly Cleaned AA3005 Samples made from Recycled Metal 2 cm Coil 9 Coil 10 1 cm Coil 11 Coil 12 Coil 13 International Conference on Environmental friendly Pretreatments fo Aluminium and other Metals, Oslo, Norway, June 16-18, 2004
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Critical Issues for Chrome-free Pretreatment of Aluminium Alloys

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