Crevice Corrosion Behavior of Alloy 690 in High-Temperature Aerated Chloride Solution

Crevice corrosion behavior of Alloy 690 in high-temperature aerated chloride solution was studied using a self-designed crevice device. The SEM, EDS, XRD, and XPS analyses results indicated that the oxide films outside the crevice consisted of Ni-Cr oxides containing a small amount of hydroxides, and the oxide films on crevice mouth consisted of a (Ni,Fe)(Fe,Cr)2O4 spinel oxides outer layer and a Cr(OH)3 inner layer, and the oxide films inside the crevice consisted of a α-CrOOH outer layer and a Cr(OH)3 inner layer. When crevice corrosion occurred, the hydrolysis of Cr3+ led to the formation of Cr(OH)3 inside the crevice, and caused the pH value of crevice solution to decrease, and Cl− migrated from outside the crevice into inside the crevice due to electrical neutrality principle and accumulation. When the water chemistry inside the crevice reached the critical value of active dissolution of metal, the active dissolution of metal inside the crevice occurred. In addition, (Ni,Fe)(Fe,Cr)2O4 spinel oxides on the crevice mouth were formed by the deposition of metal ions migrated from inside the crevice. The mechanism of crevice corrosion and the formation mechanism of oxide films at different regions were also discussed.

[1]  K. Tsai,et al.  The Corrosion Susceptibility of 304L Stainless Steel Exposed to Crevice Environments , 2022, Materials.

[2]  G. Mori,et al.  Investigation of the effects of temperature and exposure time on the corrosion behavior of a ferritic steel in CO2 environment using the optimized linear polarization resistance method , 2022, Results in Materials.

[3]  S. Pahlavan,et al.  Proposed stability product criterion for open hemispherical metastable pits formed in the crevices of different aspect ratios (l/d) on 316L stainless steel in 3.5% NaCl solution , 2021 .

[4]  E. Han,et al.  Uniform corrosion behavior of FeCrAl alloys in borated and lithiated high temperature water , 2021 .

[5]  Xin Wang,et al.  Crevice corrosion behavior of X70 steel in NaCl solution with different pH , 2021 .

[6]  E. Han,et al.  Nodular corrosion inside the crevice of Alloy 690 in deaerated high-temperature chloride solution , 2021 .

[7]  E. Han,et al.  Effects of thiosulfate and dissolved oxygen on crevice corrosion of Alloy 690 in high-temperature chloride solution , 2021 .

[8]  K. Tsai,et al.  Influence of Chloride Concentration on Stress Corrosion Cracking and Crevice Corrosion of Austenitic Stainless Steel in Saline Environments , 2020, Materials.

[9]  Xinqiang Wu,et al.  Effects of 405 stainless steel on crevice corrosion behavior of Alloy 690 in high-temperature pure water , 2020 .

[10]  D. Hur,et al.  Molar Ratio Effect of Sodium to Chloride Ions on the Electrochemical Corrosion of Alloy 600 and SA508 in HCl + NaOH Mixtures , 2020, Materials.

[11]  Xinqiang Wu,et al.  Crevice corrosion behavior of Alloy 690 in high-temperature water , 2019, Journal of Nuclear Materials.

[12]  W. Hu,et al.  Temperature dependence of passivity degradation on UNS N08800 in near neutral crevice chemistries containing thiosulphate , 2018, Corrosion Science.

[13]  X. Ma,et al.  Unmasking chloride attack on the passive film of metals , 2018, Nature Communications.

[14]  Jiapeng Liao,et al.  Fretting corrosion fatigue of Alloy 690 in high-temperature pure water , 2018 .

[15]  E. Han,et al.  Effect of irradiation on corrosion of 304 nuclear grade stainless steel in simulated PWR primary water , 2017 .

[16]  G. Was,et al.  The oxidation of alloy 690 in simulated pressurized water reactor primary water , 2017 .

[17]  A. Afacan,et al.  Passivation Degradation of Alloy 800 in Boiling Solution Containing Thiosulphate , 2017 .

[18]  E. Han,et al.  Effects of crevice geometry on corrosion behavior of 304 stainless steel during crevice corrosion in high temperature pure water , 2016 .

[19]  I. Muto,et al.  Simultaneous visualization of pH and Cl− distributions inside the crevice of stainless steel , 2016 .

[20]  Lei Wang,et al.  Effect of dissolved hydrogen on corrosion of 316NG stainless steel in high temperature water , 2015 .

[21]  Jingli Luo,et al.  A mechanistic study on sulfur-induced passivity degradation on Alloy 800 in simulated alkaline crevice chemistries at temperatures ranging from 21 °C to 300 °C , 2015 .

[22]  E. Han,et al.  Oxidation Behavior of 304 Stainless Steel During Crevice Corrosion in High-Temperature Pure Water , 2015 .

[23]  M. Pijolat,et al.  XPS study of Ni‐base alloys oxide films formed in primary conditions of pressurized water reactor , 2015 .

[24]  Le-fu Zhang,et al.  Electrochemical and XPS investigation of the corrosion behavior of Alloy 690 at high-temperature water , 2015, Journal of Solid State Electrochemistry.

[25]  S. Fujimoto,et al.  Characterization of oxide films formed on Alloy 600 and Alloy 690 in simulated PWR primary water by using hard X-ray photoelectron spectroscopy , 2015, Journal of Solid State Electrochemistry.

[26]  F. Huang,et al.  Comparison of Corrosion Resistance of UNS N06690TT and UNS N08800SN in Simulated Primary Water with Various Concentrations of Dissolved Oxygen , 2014 .

[27]  Jingli Luo,et al.  A mechanistic study on thiosulfate-enhanced passivity degradation of Alloy 800 in chloride solutions , 2013 .

[28]  E. Han,et al.  Influence of dissolved oxygen concentration on the oxide film formed on Alloy 690 in high temperature water , 2013 .

[29]  Steven J. Zinkle,et al.  Materials Challenges in Nuclear Energy , 2013 .

[30]  F. Song.  Predicting the chemistry, corrosion potential and corrosion rate in a crevice formed between substrate steel and a disbonded permeable coating with a mouth , 2012 .

[31]  Wei Ke,et al.  Influence of dissolved oxygen on oxide films of Alloy 690TT with different surface status in simulated primary water , 2011 .

[32]  E. Han,et al.  The mechanism of oxide film formation on Alloy 690 in oxygenated high temperature water , 2011 .

[33]  E. Han,et al.  Influence of Zn injection on characteristics of oxide film on 304 stainless steel in borated and lithiated high temperature water , 2011 .

[34]  E. Han,et al.  Electrochemical properties and growth mechanism of passive films on Alloy 690 in high-temperature alkaline environments , 2010 .

[35]  R. Evitts,et al.  A critical crevice solution and IR drop crevice corrosion model , 2008 .

[36]  P. Marcus,et al.  XPS and STM study of the growth and structure of passive films in high temperature water on a nickel-base alloy , 2004 .

[37]  J. A. Gorman,et al.  Quantitative Assessment of Submodes of Stress Corrosion Cracking on the Secondary Side of Steam Generator Tubing in Pressurized Water Reactors: Part 1 , 2003 .

[38]  P. Marcus,et al.  XPS study of oxides formed on nickel‐base alloys in high‐temperature and high‐pressure water , 2002 .

[39]  G. McRae,et al.  The corrosion of Alloy 690 in high-temperature aqueous media : thermodynamic considerations , 2001 .

[40]  G. Weir,et al.  Calculating chemical concentrations during the initiation of crevice corrosion , 2000 .

[41]  B. Beverskog,et al.  Pourbaix Diagrams for the Ternary System of Iron-Chromium-Nickel , 1999 .

[42]  H. Pickering,et al.  A clearer view of how crevice corrosion occurs , 1995 .

[43]  D. A. Vermilyea,et al.  A Simple Crevice Corrosion Theory , 1970 .

[44]  Jingli Luo,et al.  Review—Factors Influencing Sulfur Induced Corrosion on the Secondary Side in Pressurized Water Reactors (PWRs) , 2019, Journal of The Electrochemical Society.

[45]  E. Han,et al.  Corrosion behavior of Alloy 690 in aerated supercritical water , 2013 .

[46]  Digby D. Macdonald,et al.  Transport processes in steam generator crevices: III. Experimental results , 2002 .

[47]  S. Sharland,et al.  A mathematical model of crevice and pitting corrosion—I. The physical model , 1988 .

[48]  S. Sharland.  A mathematical model of crevice and pitting corrosion. II: the mathematical solution , 1988 .

[49]  S. M. Sharland,et al.  A review of the theoretical modelling of crevice and pitting corrosion , 1987 .

[50]  R. Cottis,et al.  THE DETERMINATION OF pH, POTENTIAL AND CHLORIDE CONCENTRATION IN CORRODING CREVICES ON 304 STAINLESS STEEL AND 7475 ALUMINIUM ALLOY , 1987 .

[51]  J. W. Oldfield,et al.  Crevice Corrosion of Stainless Steels: I. A Mathematical Model , 1978 .