hey, when i read some papers and books about corrosions of metal materials, there are some descriptions like "The 400-series stainless steels will pit in propionic acid solutions, probably because of borderline passivity....", "Field experience has been that type 304 demonstrates borderline passivity above 80% and is not suitable for such service.".
I don't know the meaning of borderline passivity?
Sumit Bhowmick
Borderline passivity is an unstable state where any surface disturbance can destabilize the passive film.
Likely within active-passive transition state, but only slightly tilted to passive state. A little disturbance and it becomes active from passive.
Hope you know active-passive-transpassive states of corrosion
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