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Pure and Applied Chemistry, 1989
Alloys and ceramics may experience accelerated corrosion at high temperatures when their surfaces are coated by a thin film of fused salt in an oxidizing environment. Because of their high thermodynamic stabilities, fused alkali sulfates are frequently deposited or condensed onto hot substrates from the combustion product gases or else by the oxidation
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Alloys and ceramics may experience accelerated corrosion at high temperatures when their surfaces are coated by a thin film of fused salt in an oxidizing environment. Because of their high thermodynamic stabilities, fused alkali sulfates are frequently deposited or condensed onto hot substrates from the combustion product gases or else by the oxidation
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Journal of Materials Science, 2002
The oxidation and hot corrosion behavior of the binary iron aluminide, Fe-25Al (at.%), has been studied at 1100 K, 1225 K and 1330 K. Hot corrosion studies were conducted by coating the specimen surfaces with 2.5 ± 0.2 mg/cm2 of Na2SO4 prior to exposure in pure oxygen. Parabolic rate constants were obtained from weight gain data. The faster kinetics in
D. Das +2 more
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The oxidation and hot corrosion behavior of the binary iron aluminide, Fe-25Al (at.%), has been studied at 1100 K, 1225 K and 1330 K. Hot corrosion studies were conducted by coating the specimen surfaces with 2.5 ± 0.2 mg/cm2 of Na2SO4 prior to exposure in pure oxygen. Parabolic rate constants were obtained from weight gain data. The faster kinetics in
D. Das +2 more
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Hot corrosion in a temperature gradient
Materials and Corrosion, 1999Abstract Hot corrosion is the accelerated attack of materials at elevated temperatures that is induced by a thin film of fused salt. Many materials that experience hot corrosion are exposed to high heat fluxes and temperature gradients. The hot corrosion of metals can be described by the dissolution of a protective metal oxide into the ...
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1982
This paper reviews the results of hot corrosion mechanisms research carried out in Round 2 of COST 50 and sets it in relation to contemporary research outside COST 50.
J. F. G. Condé, E. Erdös, A. Rahmel
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This paper reviews the results of hot corrosion mechanisms research carried out in Round 2 of COST 50 and sets it in relation to contemporary research outside COST 50.
J. F. G. Condé, E. Erdös, A. Rahmel
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Microcell processes in hot corrosion
Corrosion Science, 1993Abstract It has been proved that there exists a microcell process in hot corrosion. The microcell is mainly determined by inhomogeneities and defect properties in the oxide film formed on the surface of the metal or alloy during hot corrosion. Three experimental methods have been used to prove the above mechanism.
Mo Daobin, He Yedong, Zhu Rizhang
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Titanium Corrosion by a Hot Perfluoropolyether
Corrosion, 1980The kinetics and mechanism of titanium corrosion by Krytox MLO-71-6 are reported. The rate of corrosion is found to be dependent on the presence of molecular oxygen in the environment. For titanium corrosion to occur, the lubricant chains must first break down into smaller reactive molecules.
Wayne L. Chandler +4 more
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Hot Corrosion of Oxide Ceramics
1994The hot corrosion of oxide ceramics is described by examining the hot corrosion of A12O3, SiO2 and Y2O3 — stabilized ZrO2 in Na2SO4 and Na2SO4 — NaVO3 solutions at temperatures between 700° and 1000°C. Depending upon the properties of the molten deposit and the oxide ceramics a number of hot corrosion processes are possible. Acidic or basic dissolution
F.S. Pettit, G.H. Meier, J.R. Blachere
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Hot Corrosion of Protective Coatings
Materials and Manufacturing Processes, 2000Abstract Abstract Improvement in efficiencies of gas turbine engines requires a significant increase of gas inlet temperatures. This results in an increased service temperature for blade materials and consequently in enhanced oxidation and hot corrosion attack of the blade coatings, which are usually of MCrAlY type where M is Ni, Co or NiCo.
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2007
Abstract This chapter examines the hot corrosion resistance of various nickel- and cobalt-base alloys in gas turbines susceptible to high-temperature (Type I) and low-temperature (Type II) hot corrosion. Type I hot corrosion is typically characterized by a thick, porous layer of oxides with the underlying alloy matrix depleted in ...
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Abstract This chapter examines the hot corrosion resistance of various nickel- and cobalt-base alloys in gas turbines susceptible to high-temperature (Type I) and low-temperature (Type II) hot corrosion. Type I hot corrosion is typically characterized by a thick, porous layer of oxides with the underlying alloy matrix depleted in ...
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