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- Title
Comparing Electrochemical Passivation and Surface Film Chemistry of 654SMO Stainless Steel and C276 Alloy in Simulated Flue Gas Desulfurization Condensates.
- Authors
Liao, Luhai; Cheng, Yifan; Zhang, He; Yuan, Xuwen; Li, Fengguang
- Abstract
This research examines the behavior of electrochemical passivation and the chemistry of surface films on 654SMO super austenitic stainless steel and C276 nickel-based alloy in simulated condensates from flue gas desulfurization in power plant chimneys. The findings indicate that the resistance to polarization of the protective film on both materials initially rises and then falls with either time spent in the solution or the potential of anodic polarization. Comparatively, 654SMO exhibits greater polarization resistance than C276, indicating its potential suitability as a chimney lining material. Mott–Schottky analysis demonstrates that the density of donors in the passive film formed on 654SMO exceeds that on C276, potentially due to the abundance of Fe oxide in the passive film, which exhibits the characteristics of an n-type semiconductor. The primary components of the passive films on both materials are Fe oxides and Cr oxides. The formation of a thin passive film on C276 in the simulated condensates is a result of the low Gibbs free energy of nickel oxide and low Cr content. The slower diffusion coefficient of point defects leads to the development of a thicker and more compact passive film on the surface of 654SMO.
- Subjects
FLUE gas desulfurization; SURFACE passivation; SURFACE chemistry; STAINLESS steel; AUSTENITIC stainless steel; GAS condensate reservoirs; ELECTROLYTIC corrosion; COSMIC abundances
- Publication
Materials (1996-1944), 2024, Vol 17, Issue 8, p1827
- ISSN
1996-1944
- Publication type
Article
- DOI
10.3390/ma17081827