Weight loss and potentiodynamic tests were performed to determine the corrosivity of AISI-ASE 1020 carbon steel in aqueous solutions containing diethanolamine (DEA) and/or its principal degradation products. The solutions were either free from or saturated with CO2. The amine solutions were found to be corrosive in the presence of CO2, and corrosion rates at 100 °C and atmospheric pressure ranged from approximately 1.6 to 2.1 mm/year for DEA concentrations of 30-60 wt %, respectively. 3-(Hydroxyethyl)-2-oxazolidone, which is a major degradation compound of DEA, was found to be most corrosive. The corrosivity of DEA solutions in the presence of CO2 is explained qualitatively in terms of the reduction in solution pH and the enlargement of the corrosion region in the Pourbaix diagram due to metal complexing.
|Number of pages||4|
|Journal||Industrial and Engineering Chemistry Product Research and Development|
|Publication status||Published - 1986|