Abstract The effect of various organic and inorganic compounds in inhibiting the stress corrosion cracking (SCC) of Type 403 stainless steel steam turbine blades in 0.01M Na2SO4 solution at 100°C has been investigated. Polarization measurements were conducted in the absence and in the presence of various additives of different concentrations. Times to failure of rod specimens, using the slow strain rate technique, were measured in 0.01M Na2SO4 solutions with and without the additives under an applied potential of +540 mVH. Sodium silicate was found to be the only effective inhibitor among the inorganic compounds that were tested. A failure time equivalent to that in air was found with the addition of 0.28M Na2SiO3. Hexylamine, cyclohexylamine, morpholine, and octadecylamine were also effective in inhibiting the SCC of Type 403. Their effectiveness was in the order: octadecylamine > cyclohexylamine » hexylamine > morpholine The critical concentration of octadecylamine necessary to retard the SCC of Type 403SS was found to be much less than those for hexylamine, cyclohexylamine, and morpholine.
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