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Effect of Surface Pretreatment on the Underpaint Corrosion of AA2024-T3 at Various Temperatures

“…Chromate conversion coatings also lead to a decrease in the FFC growth rates but increased severity of the attack is observed in the fi lament tail. [49][50][51] A decrease in rate has been related to the adhesion of the coating as a result of these surface pretreatments. [49][50][51] However, the effects of pretreatment that specifi cally alter surface Cu content in the form of IMC and replated Cu that drive cathodic electron transfer reactions (ETR) have not been investigated.…”

Chromate replacement in coatings for corrosion protection of aerospace aluminium alloys

“…The potential difference between the head and the tail can be up to 0.4 V, and this differential is the driving force for filiform corrosion [1]. The copper containing alloys of the 2xxx and 7xxx series are the most susceptible to filiform corrosion [5].…”

“…The corrosion protection system is generally made up of multiple components and incorporates a surface treatment, such as a chromate conversion coating, which can promote adherence of a paint layer [6] as well as imparting corrosion protection to the underlying metal [5,7]. An organic primer coating containing inhibitive pigments is applied to the chromate layer, with the inhibitor designed to leach out of the organic layer when corrosion activity occurs [8].…”

Strategies for the replacement of chromic acid anodising for the structural bonding of aluminium alloys

“…Standard practises used for the evaluation of corrosion performance include neutral salt-spray testing and filiform corrosion. In addition, a number of electrochemical techniques can be used to determine the degree or rate of corrosion of anodised aluminium 77,[111][112][113][114] , results from linear polarisation studies are presented, herein.…”