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The influence of mechanical deformation and heating on the protective performance of a chromium-free conversion treatment for aluminium alloys has been assessed by polarisation and AC impedance measurements. Protection is unlikely to be seriously compromised by typical production operations.
The performance on aluminium-manganese alloy 3003 of hexafluorotitanic acid (H 2 TiF 6 ) conversion treatments incorporating either poly(acrylic acid) (PAA) or tannic acid (TA) has been studied and compared with coatings without organic additions and coatings containing only the two organic compounds. Polarisation curves were first used to assess the performance, and elucidate protective...
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