Positron Annihilation in Corroded Steels St20 and St3S

The paper deals with examining the lifetimes of positrons emitted from 22 Na source in corroded St20 and St3S steels.Influence of the method of defecting the sample surfaces on the spectrum of positron lifetimes was investigated.Influence of temperature of initial annealing of samples, plastic deformation, electrolytic hydrogenation and corrosion in HCl vapors on trapping positrons in the examined steels was also determined.