Stress Corrosion Cracking of Carbon Steel in Aqueous Diethanolamine and Monoethanolamine Solutions

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  • Stress Corrosion Cracking of Carbon Ste

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Abstract

Electrochemical voltametric scans and slow-strain rate tests have been used to characterize the stress corrosion cracking behavior of carbon steel in diethanolamine (DEA) and monoethanolamine (MEA) solutions. Pure DEA and MEA solutions show a weak electrochemical reactivity toward carbon steel and do not promote cracking. However, solutions of these aminoalcohols saturated with CO2 show considerable electrochemical reactivity and a strong tendency to cause stress corrosion cracking in the potential range -0.8 to -0.6V (SCE). In CO2 saturated MEA solutions cracking was intergranular with a minor tendency for transgranular cracking only at lower potentials. In CO2 saturated DEA solutions only transgranular cracking was observed in the whole potential range of cracking. The mechanistic significance is discussed.

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