Title of article :
Effects of Hydrogen Contents on Oxidation Behavior of Alloy690TT and Associated Boron Accumulation within Oxides inHigh-Temperature Water
Author/Authors :
Hur, Do Haeng Nuclear Materials Research Division - Korea Atomic Energy Research Institute - Yuseong-gu - Daejeon , Republic of Korea , Jeon, Soon-Hyeok Nuclear Materials Research Division - Korea Atomic Energy Research Institute - Yuseong-gu - Daejeon , Republic of Korea , Song, Geun Dong Nuclear Materials Research Division - Korea Atomic Energy Research Institute - Yuseong-gu - Daejeon , Republic of Korea
Abstract :
TheaimofthisworkistocharacterizetheoxidelayerstructureofAlloy690TTinhigh-temperaturewaterwithdifferentdissolvedhydrogen(DH)contentsbyusinganX-rayphotoelectronspectroscopy.UnderthelowDHcontents(0.4494–0.8988mg/kg),theoxidelayerswerecomposedofanoutermostlayerofNi(OH)2andCr(OH)3enrichedinNi,anintermediatelayerofhydroxidesandoxidesenrichedinCr,andaninnerCr2O3layer.OutermostNiOcoexistswithsmallamountofCr2O3layer,whileintheinneroxideonlyCr2O3remains.TheoxidelayersatmediumandhighDHcontents(3.1458–8.9880mg/kg)consistedofanoutermostlayerofNi(OH)2andCr(OH)3enrichedinCr,anintermediatelayerofmetallicNi,hydroxidesandoxidesenrichedinCr,andaninnerCr2O3layer.Inaddition,boroncompoundscontainingB3+ionswereaccumulatedinthethickandporousNiOlayerformedatlowDHcontents,whereastheaccumulationofboroncompoundsdidnotoccurinthethinanddensepolyhedraloxidelayerformedatmediumandhighDHcontents.
Keywords :
Hydrogen Contents , Oxidation Behavior , Alloy 690TT , Associated Boron Accumulation , Oxides , High-Temperature Water , DH
