Abstract
The SUS304 stainless steel has experienced severe general corrosion in the CO2 removal units using diglycolamine (DGA), which were located in Niigata prefecture in Japan. For the purpose of selecting suitable corrosion-resistant materials, sample specimens of 15 Fe/Ni-base alloys were installed in the units for about three months. The crrosion behavior of Carpenter, SUS 304, 13Cr alloys and Cr, Cu, Ni was investigated in a 5.0M DGA solution in the laboratory using potentiodynamic polarization and impedance measurements under 4.5MPa CO2 at 100°C. The results of the electrochemical measurements in the laboratory agreed with the test results obtained in the actual units in tendency. The results showed that the corrosion resistance of Fe/Ni-base alloys in the CO2-loaded highly concentrated DGA solution mainly depended on the Cr content of the alloys, because the DGA-carbamate seemed to form soluble chelate compounds with Cu2+, Ni2+ and Fe2+, but not with Cr3+. In the CO2 removal units, a Ni-Cu alloy corroded severely, but the Fe/Ni-base alloys, of which Cr content was higher than 21% or 22%, showed excellent resistance.
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