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Abstract

The paper discusses the possibility of improving resistance of heat exchangers made of gray cast iron with flake graphite to hightemperature corrosion by providing them with metallic coatings. A metallic coating containing 76.9% Ni, 19.8% Cr, 1.7% Si, 0.9% Fe, and 0.9% Mn was applied by means of the plasma spraying method and subjected to cyclically variable thermal loads in the atmosphere of solid fuels combustion products (oxygen, sulfur, chlorine, and sodium). In a 30-day thermal load test held at temperature 500°C it has been found that thickness of the metallic coating decreased from the initial (240 ± 6) μm to (231 ± 6) μm. The depth to which sulfur, chlorine, and sodium penetrated the coating was about 30 μm. Increased oxygen content occurred along the whole coating depth. In the coating area adjacent to the substrate surface, the content was twice as high compared to this observed in the initial coating material. Although presence of oxygen was found within the whole depth of the coating, i.e. (231 ± 6) μm, no signs of susceptibility of the sprayed metallic layer to separation from substrate of gray cast iron with flake graphite were found.
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Authors and Affiliations

A. Trytek
M. Tupaj
M. Mróz
A.W. Orłowicz
M. Radoń
M. Jacek
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Abstract

In this paper, detailed characterization of the oxide scale, grown on the Inconel 686 coating after high-temperature oxidation at 650°C in ashes from waste incineration power plant was performed. Phase composition, morphology, microstructure and chemical composition of the oxide scale were investigated using XRD and SEM analysis. Mechanisms of formation and growth of oxide scales were examined, resulting in the insights into oxidation kinetics. Results revealed presence of NiO in the outermost layer of the oxide scale. At the bottom of oxide scale, CrNi2O4 spinel layers were formed due to the increasing concentration of Cr. In the middle area of oxide scale, due to higher concentration of Cr and lower amount of Ni, the Cr2NiO4 spinel is formed. The innermost layer was composed of Cr2O3.
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Authors and Affiliations

M. Solecka
1
ORCID: ORCID
B. Rutkowski
2
ORCID: ORCID
A. Kopia
2
ORCID: ORCID

  1. Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymonta Str., 30-059 Krakow, Poland
  2. AGH University of Science and Technology, Faculty of Metals Engineering and Industrial Computer Science, Al. A. Mickiewicza 30, 30-059 Kraków, Poland
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Abstract

In this investigation the surface of an aluminized sample of plain carbon steel was melted and alloyed using a tingsten inert gas (TIG) welding process to produce iron-aluminide intermetallic phases on the surface. The produced coating was then characterized by SEM and EDS and its high-temperature properties in O2 + 1%SO2 gas were examined. The results showed that the Fe3Al coating produced could protect the substrate as it was subjected to the corroding gases at 700oC due to the formation of an alumina layer between the substrate and an outer layer of Fe2O3. At 900oC, the coating could only protect the substrate for 64 h. The lack of further protection at this temperature is attributed to the decrease in the protective properties of alumina with an increase in its temperature and the lack of presence of enough Al atoms in the coating for the repair of the defects formed in the alumina layer.

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Authors and Affiliations

P. Omranian-Mohammadi
R. Raiszadeh
H.R. Shahversdi

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