Discussion
Three of the following are forms of differential aeration corrosion. The exception is
Answer: C
Correct answer: intergranular corrosion of a sensitised weld
Intergranular attack is a metallurgical effect: chromium carbide precipitates at the grain boundaries in the heat-affected zone and leaves them depleted in chromium, so they lose their passivity. Oxygen has nothing to do with it. Crevices, waterlines and deposits are all differential aeration cells, in which the oxygen-starved region becomes the anode.
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