Corrosion behavior of a precipitation hardened Ni–Cr–Co–Mo alloy under partial slagging coal gasification conditions
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Sungkyu Lee
Abstract
A mechanistic exposure experiment was performed on the commercially available precipitation hardened VDM® alloy C–263 (Nicrofer® 5120 CoTi) Ni-Cr-Co-Mo alloy samples (21 wt.-% Cr, 21 wt.-% Co, 6.1 wt.-% Mo, 2.4 wt.-% Ti, 0.7 wt.-% Fe, 0.6 wt.-% Al, 0.6 wt.-% Mn, 0.4 wt.-% Si, 0.2 wt.-% Cu, 0.08 wt.-% C and bal. Ni) at coal gasification pilot plant facilities affiliated with the Institute for Advanced Engineering in Yongin, South Korea. Thermodynamic Ellingham–Pourbaix stability diagrams were constructed to provide insight into the mechanism of the observed corrosion behavior prevailing in the piping materials between the particulate removal unit and water scrubber of the coal gasification pilot plant. The thermodynamic inference on the corrosion mechanism was supplemented with the morphological, compositional and microstructural analyses of the exposed samples using scanning electron microscopy and energy-dispersive X-ray spectroscopy analyses performed on the external and cross–sectional surfaces of the recovered corrosion test samples to comprehensively examine the corrosion scale. Corrosion products with conspicuous spallation were observed after 139 h exposure to the corrosive environment (60 vol.-% CO, 28.4 vol.-%H2, 2.5 vol.-% CO2, 0.8 vol.-% CH4, 600 ppm H2S, and 110 ppm carbonyl sulfide under 2.005 MPa and 170 °C). Scanning electron microscopy and energy-dispersive X-ray spectroscopy positively identified formation of rather extensively peeled–off oxides as corrosion scales on the post–exposure alloy samples, which were attributed to the combined effects of evaporation of hydrated Fe, Al, and Cr chlorides and their subsequent transformation into thin (spalled) oxides. This article contains technical contents on the effects of Cr, Mo, Fe, and Al on the observed corrosion behavior which supplement and cast engineering insight into the previously published MP 2-2018 article on corrosion behavior of Ni-Cr-Mo-Fe alloy in a similar environment.
References
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Articles in the same Issue
- Inhalt/Contents
- Contents
- Fachbeiträge/Technical Contributions
- Investigation of phase transformations in mill scales for the purification process
- Exposure response function for a quantitative prediction of weathering caused aging of polyethylene
- Mechanical properties characterization of resistance spot welded DP1000 steel under uniaxial tensile tests
- Corrosion failure analysis of a perforated F32 reactor
- Prediction of mechanical properties of Al6061 metal matrix composites reinforced with zircon sand and boron carbide
- Tribological behavior of a hydrostatically extruded ultra-fine grained Ti-13Nb-13Zr alloy
- Characterization of boronized AISI 1050 steel and optimization of process parameters
- Experimental investigation on mechanical properties of AA7075-AlN composites
- Modeling of machining parameters for MRR and TWR in EDM characteristics on Al/10 wt.-% TiB2 composites
- Artificial neural network approach to predict ion nitrided case depth and surface hardness of AISI 4340 steel
- Theoretical and experimental investigation of stress distribution in a crane hook
- Mechanical properties, degradation and flue gas analysis of basalt and glass fiber reinforced recycled polypropylene
- Corrosion behavior of a precipitation hardened Ni–Cr–Co–Mo alloy under partial slagging coal gasification conditions
- Effect of different loading systems on acousto-ultrasonic characteristics of concrete under axial compression