Abstract
The influence of solution annealing (T4) and artificial aging (T6) on the corrosion properties of a technical Al‐Mg‐Si alloy was investigated. In the T4 condition, the material was not susceptible to intergranular corrosion; however, pitting was identified to occur. Subsequent artificial aging of the solution annealed and quenched alloys introduced susceptibility to intergranular corrosion. This phenomenon was attributed to two microgalvanic coupling situations: one that occurred between the noble Cu‐phases located on the grain boundary and the anodic adjacent area and one between a Mg‐ and Si‐depleted zone along the grain boundaries and the adjacent area. Pitting corrosion was proposed to occur as a result of the absence of these microgalvanic coupling situations, and therefore with the absence of a distinct, preexisting corrosion path in the solution annealed condition. Copyright © 2015 John Wiley & Sons, Ltd.
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