In this study, the oxidation behaviour of alloy 617, alloy 740, alloy HR6W and Sanicro 25 was investigated in SCW and vapour environment at 650°C for 320 h. The weight gain and the thickness of the oxide films of samples after exposure in SCW are higher than that in vapour. Inner oxidation phenomena were observed on alloy HR6W and Sanicro 25, which have higher content of Fe. The structure of the oxide films formed on alloy 617, alloy 740, alloy HR6W and Sanicro 25 after exposure in SCW at 650°C for 320 h is composed by a Fe-rich (mainly hematite) outer layer and a Cr-rich inner layer. The thickness of the outer Fe-rich layer is related with the Fe content in alloy matrix. Oxide films spallation phenomena were found on alloy HR6W after exposure in SCW.
ViswanathanRColemanKRaoU.Materials for ultra-supercritical coal-fired power plant boilers. Int J Pres Ves Pip. 2006; 83: 778–783. doi: 10.1016/j.ijpvp.2006.08.006
2.
WrightIGDooleyR.A review of the oxidation behaviour of structural alloys in steam. Int Mater Rev. 2010; 55: 129–167. doi: 10.1179/095066010X12646898728165
3.
AbeF.Research and development of heat-resistant materials for advanced USC power plants with steam temperatures of 700°C and above. Engineering. 2015; 1: 211–224. doi: 10.15302/J-ENG-2015031
4.
ZhangNQZhuZLLvFB. Influence of exposure pressure on oxidation behavior of the ferritic-martensitic steel in steam and supercritical water. Oxid Met. 2016; 86: 113–124. doi: 10.1007/s11085-016-9624-1
5.
LiYHXuTTWangSZ. Modelling and analysis of the corrosion characteristics of ferritic-martensitic steels in supercritical water. Materials. 2019; 12: 20.
6.
ZhongXYWuXQHanEH.Effects of exposure temperature and time on corrosion behavior of a ferritic-martensitic steel P92 in aerated supercritical water. Corros Sci. 2015; 90: 511–521. doi: 10.1016/j.corsci.2014.10.022
7.
BischoffJMottaATEichfeldC. Corrosion of ferritic-martensitic steels in steam and supercritical water. J Nucl Mater. 2013; 441: 604–611. doi: 10.1016/j.jnucmat.2012.09.037
8.
ZhangNQYueGQLvFB. Oxidation of low-alloy steel in high temperature steam and supercritical water. Mater High Temp. 2017; 34: 222–228. doi: 10.1080/09603409.2017.1286549
9.
WrightIDooleyR.Steam-side scale morphologies associated with scale exfoliation from ferritic steel T22. Mater High Temp. 2013; 30: 168–182. doi: 10.3184/096034013X13756933883521
10.
LiangZYZhaoQX.High temperature oxidation of Fe-Ni-base alloy HR120 and Ni-base alloy HAYNES 282 in steam. Mater High Temp. 2019; 36: 87–96. doi: 10.1080/09603409.2018.1465712
HolcombGR.High pressure steam oxidation of alloys for advanced ultra-supercritical conditions. Oxid Met. 2014; 82: 271–295. doi: 10.1007/s11085-014-9491-6
13.
KritzerP.Corrosion in high-temperature and supercritical water and aqueous solutions: a review. J Supercrit Fluids. 2004; 29: 1–29. doi: 10.1016/S0896-8446(03)00031-7
14.
MartinelliLBalbaud-CelerierFTerlainA. Oxidation mechanism of a Fe-9Cr-1Mo steel by liquid Pb-Bi eutectic alloy (Part I). Corros Sci. 2008; 50: 2523–2536. doi: 10.1016/j.corsci.2008.06.050
15.
WatanabeYYiYKondoT. Steam oxidation of ferritic heat-resistant steels for ultra supercritical boilers. Zairyo-to-Kankyo. 2001; 50: 50–56. doi: 10.3323/jcorr1991.50.50
16.
AngellMGListerSKRudgeA.2008. The effect of steam pressure on the oxidation behaviour of annealed 9Cr 1Mo boiler tubing materials. 15th International Conference on the Properties of Water and Steam (ICPWS XV), Berlin. p. 8-11.
17.
YangJQWangSZTangXY. Effect of low oxygen concentration on the oxidation behavior of Ni-based alloys 625 and 825 in supercritical water. J Supercrit Fluids. 2018; 131: 1–10. doi: 10.1016/j.supflu.2017.07.008
18.
ChangKHHuangJHYanCB. Corrosion behavior of alloy 625 in supercritical water environments. Prog Nucl Energy. 2012; 57: 20–31. doi: 10.1016/j.pnucene.2011.12.015
19.
ZhangZWangJHanE-H. Influence of dissolved oxygen on oxide films of alloy 690TT with different surface status in simulated primary water. Corros Sci. 2011; 53: 3623–3635. doi: 10.1016/j.corsci.2011.07.012
20.
YangJQWangSZXuDH. Effect of ammonium chloride on corrosion behavior of Ni-based alloys and stainless steel in supercritical water gasification process. Int J Hydrogen Energy. 2017; 42: 19788–19797. doi: 10.1016/j.ijhydene.2017.05.078
21.
YangJWangSLiY. Novel design concept for a commercial-scale plant for supercritical water oxidation of industrial and sewage sludge. J Environ Manag. 2019; 233: 131–140. doi: 10.1016/j.jenvman.2018.11.142
22.
WasGSAmpornratPGuptaG. Corrosion and stress corrosion cracking in supercritical water. J Nucl Mater. 2007; 371: 176–201. doi: 10.1016/j.jnucmat.2007.05.017
23.
EhlersJYoungDJSmaardijkEJ. Enhanced oxidation of the 9%Cr steel P91 in water vapour containing environments. Corros Sci. 2006; 48: 3428–3454. doi: 10.1016/j.corsci.2006.02.002
24.
JacobYHaanappelVStroosnijderM. The effect of gas composition on the isothermal oxidation behaviour of PM chromium. Corros Sci. 2002; 44: 2027–2039. doi: 10.1016/S0010-938X(02)00022-7
25.
MichalikMHänselMZurekJ. Effect of water vapour on growth and adherence of chromia scales formed on Cr in high and low pO2-environments at 1000 and 1050°C. Mater High Temp. 2005; 22: 213–221. doi: 10.3184/096034005782744443
26.
AniMHBKodamaTUedaM. The effect of water vapor on high temperature oxidation of Fe-Cr alloys at 1073 K. Mater Trans. 2009; 50: 2656–2663. doi: 10.2320/matertrans.M2009212
27.
LobnigRESchmidtHPHennesenK. Diffusion of cations in chromia layers grown on iron-base alloys. Oxid Met. 1992; 37: 81–93. doi: 10.1007/BF00665632
