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Effect of Environmental Variables on Crevice Corrosion Susceptibility of Ni-Cr-Mo Alloys for Nuclear Repositories

Edgar C. Hornus, Martín A. Rodríguez

2015escrevice corrosionrepassivation potentialnickel alloysenvironmental factorslocalized corrosion

Abstract

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This study investigates the influence of environmental variables on crevice corrosion susceptibility of Ni-Cr-Mo alloys, specifically for nuclear repositories. The objective was to determine the crevice corrosion repassivation potential using the Potentiodynamic-Galvanostatic-Potentiodynamic (PD-GS-PD) method. The alloys examined included 625, C-22, C-22HS, and HYBRID-BC1, with experimental specimens exhibiting 24 artificial creviced spots created by a ceramic washer wrapped in PTFE tape. Crevice corrosion tests were conducted in 0.1 mol/L and 1 mol/L NaCl solutions at temperatures ranging from 20 to 90ºC, as well as a 5 mol/L CaCl2 solution at temperatures from 20 to 117ºC. Results showed that the crevice corrosion resistance of the alloys increased in the order of 625 < C-22 < C-22HS < HYBRID-BC1. Additionally, the repassivation potential (E CO) was correlated with temperature (T) and chloride concentration ([Cl-]) through a defined relationship: ECO = (a + b T) log [Cl-] + c T + d. Notably, at temperatures exceeding 90°C, ECO for alloy 625 stabilized at a minimum value of -0.26 VSCE.

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Cite This Work

@article{c065faba-d393-4d4a-b2aa-c258dabb813f,
  title={Effect of Environmental Variables on Crevice Corrosion Susceptibility of Ni-Cr-Mo Alloys for Nuclear Repositories},
  author={Edgar C. Hornus and Martín A. Rodríguez},
  year={2015},
  language={es}
}
TY  - JOUR
TI  - Effect of Environmental Variables on Crevice Corrosion Susceptibility of Ni-Cr-Mo Alloys for Nuclear Repositories
AU  - Edgar C. Hornus
AU  - Martín A. Rodríguez
PY  - 2015
LA  - es
ER  -

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