Effects of Hydrogen Peroxide on Corrosion of Stainless Steel, (I) Improved Control of Hydrogen Peroxide Remaining in a High Temperature High Pressure Hydrogen Peroxide Loop

Effects of Hydrogen Peroxide on Corrosion of Stainless Steel, (IV) Determination of Oxide Film Properties with Multilateral Surface Analyses

“…1,2) To determine the effects of H 2 O 2 , O 2 and their mixture on electrochemical corrosion potential (ECP) of type 304 stainless steel, the authors fabricated a high temperature, high-pressure water loop with a polytetrafluoroethylene (PTFE) inner liner which minimized H 2 O 2 decomposition and lowered possible oxygen concentration. [3][4][5][6][7] From in situ measurements, i.e., ECP and frequency dependent complex impedance (FDCI), made in previous papers, [7][8][9] the authors confirmed the following. (1) The ECP and FDCI data of the specimens exposed to 100 ppb H 2 O 2 were not affected by co-existing O 2 with the same level oxidant concentration and they were also not affected by pre-exposure to 200 ppb O 2 .…”

“…[7][8][9] More than 93% of H 2 O 2 remained at the autoclave outlet, while more than 90% remained in the sampled water.…”

“…2). [7][8][9] ECP measurement was automatically carried out every minute and the measured data were transferred to the PC of the data acquisition system. (2) Frequency Dependent Complex Impedance (FDCI)…”

Effects of Hydrogen Peroxide on Corrosion of Stainless Steel, (V) Characterization of Oxide Film with Multilateral Surface Analyses

“…[5][6][7][8][9][10][11] To determine the effects of H 2 O 2 , O 2 and their mixture on ECP of type 304 stainless steel, the authors fabricated a high temperature, high-pressure water loop with a polytetrafluoroethylene (PTFE) inner liner, which minimized H 2 O 2 decomposition and lowered possible oxygen concentration. [7][8][9][10][11][12][13][14][15] From in situ measurements, i.e., ECP and frequency dependent complex impedance (FDCI), and surface characterization of oxide film on specimens made in previous papers, [12][13][14][15][16] the authors confirmed the following. (1) The ECP and FDCI data of the type 304 stainless steel specimens exposed to 100 ppb H 2 O 2 were not affected by co-existing O 2 with the same level oxidant concentration and they were also not affected by pre-exposure to 200 ppb O 2 .…”

“…Details of the high temperature, high-pressure H 2 O 2 water loop and major experimental parameters were shown in previously. 12) It was confirmed that more than 93% of H 2 O 2 injected into the autoclave remained at the autoclave outlet and then test specimens were exposed to just H 2 O 2 with lowered possible oxygen. Test specimens were installed in a row along the flow path in the PTFE lined autoclave.…”