Effect of Heat Treatment on Pitting Corrosion 189 004 3 -2822 /7 9/0 3 0 3 -0 1 89t02.5 O/O c) The stress corrosion index I,, can indicate only the relative strength of the same material under different corrosive conditions. It cannot give an indication of the overall reduction in strength, nor will it help in comparing two mat erials.pre-strain e p ; there appears t o be a straight line relationship given by d) The stress corrosion index I,, increases with increasingThis finding will help to establish the value of I,, at different pre-strain conditions, with only one test point required to establish the slope m. SummaryThe pitting corrosion resistance of Crl7Ni12Mo2,S type steel under potentiostatic polarization in a sodium chloride solution is adversely affected by previous annealing. Even though the reproducibility and accuracy of measurements are limited due t o the statistical nature of pitting, the data obtained were systematically dependent on annealing temperature, time and surface roughness. The corrosion current, the number o f pits or the mean area of pit openingand the corrosion rate within the pits were increased by previous annealing at 550 t o 750 ' C for 1-1 00 hrs. The highest corrosion rate estimated corresponded t o heat treatments provoking severe sensitization to intergranular corrosion. The percentage area of corrosion pit openings and the estimated pit penetration rates were several times higher for as-machined than for polished surfaces. It can be assumed that pitting corrosion is little affected by the carbon content and that molybdenum depletion of grain-boundary zones is responsible for the reduced pitting resistance o f annealed steels.
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