Corrosion issues of powder coated AA6060 aluminium profiles

Din, Rameez Ud; Valgarðsson, Smári; Jellesen, Morten Stendahl; Eriksen, Hans Jørgen; Praastrup, Ulrik; Møller, Per; Ambat, Rajan

doi:10.1016/j.engfailanal.2014.10.001

Cited by 2 publications

(1 citation statement)

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“…This means that the presence of nobler phase (Al 6 [Fe, Mn, Cu]) in the Al matrix promotes pitting corrosion initiation and IGC attack, by locally increasing cathodic activity of the material, thus increasing the corrosion rate. [40][41][42][43] Once the local galvanic cells are formed between the precipitates (cathode) and the matrix (anode), hydroxide ions (OH − ) as the products of the half-cell cathodic reactions were formed on the intermetallics, which locally increase the pH value of the surrounding solution. The local pH increase consequently breaks the passive film and creates pit nuclei at intermetallic/matrix interface by the alkaline anodic dissolution of Al.…”

Section: Postpolarisation Surface Morphologymentioning

confidence: 99%

Microstructure‐dependent corrosion of herringbone‐grooved embossed Al–1.1 wt% Mn strips for heat exchanger tubes

Zaffaroni

Gudla

Laganá

et al. 2021

Materials & Corrosion

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This paper studied the effect of embossing on the microstructure and corrosion behaviour of an Al−1.1 wt% Mn sheet. The microstructure of the embossed Al−1.1 wt% Mn sheets was studied by differential interference contrast microscopy, scanning electron microscopy, transmission electron microscopy, energy‐dispersive X‐ray spectroscopy, focused ion beam microscopy and X‐ray computational tomography. Finite element modelling was used to assess the stress and strain distribution developed during embossing, and to support the experimental analyses. The corrosion behaviour of the embossed sheets was assessed using potentiodynamic anodic polarisation tests, followed by corrosion surface morphology analysis. Results showed a microstructural evolution of the alloy during embossing, which is dependent on both the embossed pattern geometry and the roll forming direction. Nonsymmetrical displacement of material, in respect to the pattern geometry, was caused by the anisotropic forming pressure applied on the strip during roll forming, which yielded the formation of more susceptible sites for pitting and intergranular corrosion on the embossed aluminium surfaces.

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Section: Postpolarisation Surface Morphologymentioning

confidence: 99%