Results 311 to 320 of about 151,122 (359)

Microcell processes in hot corrosion

Corrosion Science, 1993
Abstract 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
openaire   +1 more source

Sulfate-induced hot corrosion of nickel

Oxidation of Metals, 1984
Nickel specimens with layers of Na2SO4 deposited on the metal surface have been reacted in O2+4% SO2 in the temperature range 660–900°C. At temperatures from 671°C (the eutectic temperature of Na2SO4+NiSO4 liquid solutions) to 884°C (the melting point of Na2SO4), molten Na2SO4+NiSO4 is formed in the scales above critical pressures of SO3, and the ...
Karl Petter Lillerud, Per Kofstad
openaire   +1 more source

Hot Corrosion of Protective Coatings

Materials and Manufacturing Processes, 2000
Abstract 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.
openaire   +1 more source

Hot Corrosion of Oxide Ceramics

1994
The 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
openaire   +1 more source

Zinc Sulfate Reactions in Hot Corrosion

Journal of The Electrochemical Society, 1986
Comparaison de la corrosion de CoCrAlY (alliage de revetement des pales de turbine a gaz) revetu par pulverisation de 50% molaire ZnSO 4 −Na 2 SO 4 , et du meme alliage revetu par pulverisation de Na 2 SO 4 seul a 700 et 850°C, dans de l'air contenant du SO 3 a pression partielle controlee.
R. L. Jones, C. E. Williams
openaire   +1 more source

The Increasing Complexity of Hot Corrosion

Journal of Engineering for Gas Turbines and Power, 2017
It has been conjectured that if sulfur in fuel is removed, engine materials will cease to experience attack from hot corrosion, since this sulfur has been viewed as the primary cause of hot corrosion and sulfidation. Historically, hot corrosion has been defined as an accelerated degradation process that generally involves deposition of corrosive ...
openaire   +1 more source

Oxidation and Hot Corrosion of Intermetallics and Superalloys

CORROSION 1991, 1991
Abstract The behavior of the intermetallic materials, IC-50 and IC-218 in dynamic oxidation and hot corrosion tests is compared with that of several commercial superalloys. The tests were conducted in burner rigs, the dynamic oxidation test at 1800°F (982°C) and 2000°F (1093°C), and the hot corrosion test at 1650°F (899°C) with an ...
J. J. Barnes, G. Y. Lai, J. E. Barnes
openaire   +1 more source

Hot Corrosion of Materials in Combustion Environments

CORROSION 1991, 1991
Abstract Hot corrosion is caused by liquid deposits. It is shown that Na2SO4 and Na2SO4 - NaVO3 solutions can be taken as examples of deposits which form on materials used in combustion environments. The hot corrosion of metallic alloys and some ceramics induced by such deposits is described.
F.S. Pettit, G.H. Meier
openaire   +1 more source

Hot Corrosion in Gas Turbines

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 ...
openaire   +1 more source

CORROSION INHIBITION IN DEEP, HOT WYOMING WELLS

Proceedings of SPE Rocky Mountain Regional Meeting, 1980
ABSTRACT Downhole inhibitor treatment of several relatively deep, hot gas wells in Wyoming was used in a study of factors to consider in establishing an effective corrosion control program. Basically, one needs an effective inhibitor, a good application method, and a means to evaluate the lifetime of the treatment.
openaire   +1 more source