Improvement of Resistance of Cast-iron Heat Exchangers to High-temperature Corrosion

• Autorzy: Orłowicz A. W. , Tupaj M. , Trytek A. , Mróz M. , Radoń M. , Jacek M.

Identyfikatory

DOI

10.24425/123600

• Języki publikacji: EN

Abstrakty

EN

The paper discusses the possibility of improving resistance of heat exchangers made of gray cast iron with flake graphite to high-temperature 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.

Słowa kluczowe

EN

heat exchangers; metallic coating; resistance to corrosion; high-temperature corrosion

PL

wymienniki ciepła; powłoka metaliczna; odporność na korozję; korozja wysokotemperaturowa

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2018
• Tom: Vol. 18, iss. 3
• Strony: 49--52
• Opis fizyczny: Bibliogr. 6 poz., rys., tab.

Twórcy

autor

Orłowicz A. W.

• Rzeszow University of Technology, Department of Casting and Welding, Rzeszów, Poland

autor

Tupaj M.

• Rzeszow University of Technology, Department of Casting and Welding, Rzeszów, Poland

autor

Trytek A.

• Rzeszow University of Technology, Department of Casting and Welding, Rzeszów, Poland

autor

Mróz M.

• Rzeszow University of Technology, Department of Casting and Welding, Rzeszów, Poland

autor

Radoń M.

• Rzeszow University of Technology, Department of Casting and Welding, Rzeszów, Poland

autor

Jacek M.

• Rzeszow University of Technology, Department of Casting and Welding, Rzeszów, Poland

Bibliografia

• [1] Zawistowski, J. & Janiszewski, S. (2009). Heat exchangers in low power boilers powered by solid fuel. Steel or cast iron? Magazyn Instalatora. 1(125), 32-34. (in Polish).
• [2] Niraj Bala. Harpreet Singh. Satya Prakash. (2009). High-temperature oxidation studies of cold-sprayed Ni–20Cr and Ni–50Cr coatings on SAE 213-T22 boiler steel. Applied Surface Science. 255, 6862-6869.
• [3] Berthod, P., Michon, S., Aranda, L., Mathieu, S., & Gachon, J.C. (2013). Experimental and thermodynamic study of the microstructure evolution in cobalt-base superalloys at high temperature. Computer Coupling of Phase Diagrams and Thermochemistry. 27. 2003. 353-359.
• [4] Hou G.. Liu Z.. Wei H.. Zheng Q.. Sun X.. Guan H.. Hu Z. (2008). Oxidation of a Co-base superalloy. Journal of Materials Science & Technology. 24(6), 883-890.
• [5] Xu Lianyoung. Jing Hongyang. Huo Lixing (2005): High-Temperature Corrosion of Protective Coatings for Boiler Tubes in Thermal Power Plants. Transactions of Tianjin University. 11, 183.
• [6] Smith, G.D., Patel, S.J., Farr, N.C. Hoffmann, M. (1999): The Corrosion Resistance of Nickel-Containing Alloys in Coal-Fired Boiler Environments. Corrosion 99. USA: NACE International. Houston.

Uwagi

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).