Morphological evidence for a pitting mechanism in dilute aluminum alloys
Perkins, Arthur Jeffery
Cummings, J. R.
Graham, Kenneth J. (Kenneth Judson)
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In the course of an investigation of the seawater corrosion behavior of several dilute aluminum alloys, direct microscopic evidence of pitting phenomena was obtained. Observations, obtained by scanning electron microscopy after galvanic corrosion exposures, illustrate a pitting mechanism involving the extrusion of columns of corrosion product from pits by the action of hydrogen gas generated inside the pits. The macroscopic dissolution patterns of the various alloys and their respective microscopi dissolution morphologies are also described. The observations support the classical model for pitting of aluminum originally presented by Edeleanu and Evans. (Author)
NPS Report NumberNPS-69PS-78-005
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