The grain boundary attack occurs at high alloyed, austenitic
or ferritic, chromium and chromium nickel materials, under unfavorable conditions
at the pickling. Predominantly carbide precipitates on the grain boundaries are
responsible for this corrosion form. The grain boundary attack can lead fast to
intercrystalline corrosion if the material to be pickled was heat treated for example
badly or the pickling agent shows a not suitable composition.
8,00 mm round - solution annealed , pickled