The Influence of Dissolved Hydrogen on the Corrosion of Type 304 Stainless Steels Treated with Inhibitive Chemicals in High Temperature Pure Water

The Influence of Various Treating Parameters on the Corrosion of ZrO2-Treated Type 304 Stainless Steels in High-Temperature Water

“…Under oxygenated environments with or without the presence of dissolved hydrogen, ZrO 2 -treated specimens indeed exhibited less percentage of IGSCC and longer failure times during a series of slow strain rate tests in simulated BWR environments. 1,2) In the follow-up experiments via electrochemical polarization analysis in the same environments, it was found that the corrosion rates of the ZrO 2 -treated specimens were markedly less than those of the untreated ones. 3) In the meantime, the ECDs of the O 2 reduction and H 2 oxidation reactions on the treated specimens were lower than those on the untreated ones.…”

“…Chemicals that are promising candidates to adopt in BWR environments include zirconium oxide (ZrO 2 ) and titanium oxide (TiO 2 ), and their applications as corrosion mitigation agents in high-temperature pure water can be readily found in the literature. [1][2][3][4][5][6][7][8] The application of inhibitive treatment is aimed at deterring the reduction reactions of oxidizing species occurring on metal surfaces and the oxidation reaction of metals. Accordingly, the corrosion rate of metals is expected to decrease.…”

“…Since the first introduction of the inhibitive treatment concept in 1995, 4) laboratory experiments have been conducted to verify the effectiveness of inhibitive chemical treatment in The Influence of Various Treating Parameters on the Corrosion of ZrO 2 -Treated Type 304 Stainless Steels simulated BWR environments in the past few years. [1][2][3][5][6][7] Literature data show that the ECP of Type 304 SS treated with inhibitive chemicals could be either reduced or promoted in purely oxygenated environments, but the corrosion rate would decrease in both cases. 3,[5][6][7] In our earlier work, [1][2][3] we explored the corrosion and electrochemical characteristics of O 2 and H 2 on ZrO 2 -treated 304 SS in high-temperature pure water environments.…”

“…[1][2][3][5][6][7] Literature data show that the ECP of Type 304 SS treated with inhibitive chemicals could be either reduced or promoted in purely oxygenated environments, but the corrosion rate would decrease in both cases. 3,[5][6][7] In our earlier work, [1][2][3] we explored the corrosion and electrochemical characteristics of O 2 and H 2 on ZrO 2 -treated 304 SS in high-temperature pure water environments. Under oxygenated environments with or without the presence of dissolved hydrogen, ZrO 2 -treated specimens indeed exhibited less percentage of IGSCC and longer failure times during a series of slow strain rate tests in simulated BWR environments.…”