Strategies for High-Temperature Corrosion Simulations of Fe-Based Alloys Using the Calphad Approach: Part I

AbstractThe environmental degradation of materials at high temperatures limits the useful life of different industrial components and hinders the development of more economical and environmentally friendly processes for the energy production. Despite the importance of this phenomena, a model to predict lifetime of materials that degrade due to high-temperature corrosion has up till now been lacking due to limitations of the computational possibilities and the complex nature of oxidation. In the present work we develop some strategies to model high-temperature corrosion in Fe-based alloys using the Calphad (Calculation of Phase Diagrams) approach. It is proposed that kinetic-based simulations for oxidation of Al and Cr can accurately represent the lifetime of the protective layers in FeCrAl and FeCr alloys at different temperatures in air. The oxide systems are in addition investigated by equilibrium calculations. The corrosion mechanisms of FeCr and FeCrAl alloys are discussed based on theoretical and experimental knowledge.

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High temperature corrosion mechanisms of certain new TiAl-based intermetallic alloys in an aggressive H2/H2O/H2S environment at 850°C

Corrosion Science ◽

10.1016/j.corsci.2006.10.037 ◽

2007 ◽

Vol 49 (5) ◽

pp. 2406-2420 ◽

Cited By ~ 13

Author(s):

H.L. Du ◽

P.K. Datta ◽

D. Hu ◽

X. Wu

Keyword(s):

High Temperature ◽

High Temperature Corrosion ◽

Intermetallic Alloys ◽

Corrosion Mechanisms

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High-Temperature Corrosion Mechanisms for Selected Iron and Nickel-Based Alloys Exposed to Sulfur and Chlorine-Containing Environments

CORROSION ◽

10.5006/1409 ◽

2015 ◽

Vol 71 (4) ◽

pp. 483-501 ◽

Cited By ~ 6

Author(s):

Steven C. Kung

Keyword(s):

High Temperature ◽

High Temperature Corrosion ◽

Corrosion Mechanisms

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Dominating High Temperature Corrosion Mechanisms in Low Alloy Steels in Wood Chips Fired Boilers

Energy & Fuels ◽

10.1021/acs.energyfuels.5b02290 ◽

2016 ◽

Vol 30 (3) ◽

pp. 2385-2394 ◽

Cited By ~ 2

Author(s):

Thomas Gruber ◽

Stefan Retschitzegger ◽

Robert Scharler ◽

Ingwald Obernberger

Keyword(s):

High Temperature ◽

High Temperature Corrosion ◽

Wood Chips ◽

Low Alloy Steels ◽

Alloy Steels ◽

Corrosion Mechanisms

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Corrosion Product Characterization of a Nickel-Sodium Sulfate-Air System after Exposure to Temperatures Near 1000 C

CORROSION ◽

10.5006/0010-9312-30.4.131 ◽

1974 ◽

Vol 30 (4) ◽

pp. 131-138 ◽

Cited By ~ 7

Author(s):

RICHARD F. REISING ◽

DOUGLAS P. KRAUSE

Keyword(s):

High Temperature ◽

Corrosion Product ◽

Sodium Sulfate ◽

Initial Step ◽

High Temperature Corrosion ◽

Corrosion Products ◽

Product Characterization ◽

Air System ◽

Corrosion Mechanisms

Abstract Gas turbine engines are susceptible to high temperature corrosion which is enhanced by marine atmospheres. This high temperature corrosion is also known as sulfidation because it is believed that the formation of metal sulfides from sulfur containing substances is essential. An understanding of the corrosion mechanisms involved is necessary in seeking methods of eliminating the problem, and the initial step in formulating mechanisms is to identify the chemical reactions involved. Corrosion product characterization is essential for this identification. Characterization of the corrosion products from the nickel-sodium sulfate-air system at temperatures near 1000 C (1832 F) suggests that the sodium sulfate acts as a flux rather than as a chemical reactant. Some of the techniques used to characterize the corrosion products are discussed.

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Corrosion Mechanisms and Alloy Performance in Waste-to-Energy Boiler Combustion Environments

12th Annual North American Waste-to-Energy Conference ◽

10.1115/nawtec12-2214 ◽

2004 ◽

Cited By ~ 4

Author(s):

George Y. Lai

Keyword(s):

High Temperature ◽

Combustion Products ◽

High Temperature Corrosion ◽

Waste To Energy ◽

Vapor Pressures ◽

Boiler Tube ◽

Metal Chlorides ◽

Protection Method ◽

High Vapor ◽

Corrosion Mechanisms

The combustion of municipal solid waste in a boiler for power generation produces a very corrosive environment for the boiler tube materials. The environment contains HCl, SO2, various metal chlorides and sulfates along with typical combustion products. Due to their low melting points and high vapor pressures, metal chlorides are believed to be primarily responsible for the boiler tube corrosion problems encountered in waste-to-energy (WTE) boilers. Without some sort of corrosion protection method, the standard materials of the construction for the boiler, such as carbon and Cr-Mo steels, are subject to severe high temperature corrosion attack. The present paper discusses the possible modes of high temperature corrosion for waterwalls and boiler tubes in the convection section, and the prevailing protection method for these components as well as the performance of various alloys in these hostile combustion environments.

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