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Intergranular corrosion of a welded stainless steel occurs because chromium is

  • A.uniformly redistributed through the grains
  • B.precipitated as carbide at the grain boundaries
  • C.evaporated from the surface during welding
  • D.oxidised to a protective film at the boundaries

Answer: B

Chromium carbide forming in the heat-affected zone leaves the adjacent metal too poor in chromium to passivate, so a narrow path corrodes preferentially. Low-carbon or stabilised grades, or a post-weld solution treatment, prevent the sensitisation.

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