Corrosion and Compatibility in Advanced Reactor Systems ENVIRONMENT CANDIDATE MATERIALS liquid metals Na iron based alloys Pb-Bi iron based helium/graphite Ni based alloys supercritical water Fe,Ni,Ti,Zr, based alloys stress corrosion cracking molten salt Hugh Isaacs BNL [email protected]
Corrosion and Compatibility in Advanced Reactor Systems ENVIRONMENT CANDIDATE MATERIALS liquid metals Na iron based alloys Pb-Bi iron based helium/graphite.
Dec 27, 2015
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Corrosion and Compatibility in
Advanced Reactor Systems
ENVIRONMENT CANDIDATE MATERIALS
liquid metals Na iron based alloys Pb-Bi iron based
helium/graphite Ni based alloys
supercritical water Fe,Ni,Ti,Zr, based alloys stress corrosion cracking
molten salt
Hugh IsaacsBNL
liquid metal compatibility
solubility in liquid metal construction alloys interstitials O, C, N, H
solid surfaces
extraction insertion
products
mass transport gradients in liquid activity in solids reaction
Na
Na
Na/Na2O
Pb/PbO
Ellingham-Richardson-Diagram
Pb/Pb-Bi
corrosion inhibition of ferritic steels by 50-500 ppm Zr, Ti forms nitrides or nitrides+carbides on steel surfaces
6000 h CrMoV steel
300–500 ppm Mg
300 h 2CrSiMoV steel
300–500 ppm Mg + 10-40 ppm Ti
600 C
oxygen concentration effects on steels
flowing Pb 550C 3000 h
Pb/Pb-Bi
Pb15Cr–11Ni–3Si–MoNb
low oxygen550C 2000 h
Groynin (1998)
controlled oxygen
He1000C 1000h
oxidizing conditions reducing conditions
Inconel 617
Hynes 230
Wright 2008
Wright 2008Quadakkers 1988
stronglyreducing
highly oxidizing
highly carburizing
bestregion
carburizing under oxide
“thermodynamic” representation of alloy behavior
He
Supercritical water
Ferritic–martensitic Austenitic Ni-based
weight gain largest weight gain < ferritic-m little weight gainthan ferritic–martensitic complex parametrics except below the pseudo-criticalCr reduces rate good grain boundary eng. precipitate hardened pitlowest rates at 300 ppb Oimplant Y - major improvement
Zirconium Titanium
std alloys corrode optimized comps ~ austeniticoptimized comp > austenitics
alloy systems under study
Was et al. (2007)
Stress Corrosion Cracking
Supercritical water
austenitic IGSCC > ferritic-martensitic
acidic additions increase cracking
higher Cr increases susceptibility to HCl
increased pressure increases SCC
ferritic -m in pure systems resistant to 600 C
Temperature 0-3000 K
-2 -1 log pCO=0 +1 +2
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