Kinetics of volatilization of high temperature corrosion products and its application to chlorine corrosion

2016 ◽  
Vol 68 (2) ◽  
pp. 186-196 ◽  
Author(s):  
B. Rammer ◽  
M. C. Galetz
Keyword(s):  
High Temperature ◽  
High Temperature Corrosion ◽  
Corrosion Products ◽  
Kinetics Of ◽  
Chlorine Corrosion

Kinetics of Corrosion Processes of Alloy on the Intermetallic Phase Matrix FeAl in High Temperature in Air Atmosphere

2013 ◽  
Vol 212 ◽  
pp. 137-140 ◽  
Author(s):  
Janusz Cebulski ◽  
Stanisław Lalik
Keyword(s):  
High Temperature ◽  
Heat Resistance ◽  
High Temperatures ◽  
Intermetallic Phase ◽  
High Temperature Corrosion ◽  
Corrosion Products ◽  
Corrosion Tests ◽  
Air Atmosphere ◽  
Passive Oxides ◽  
Kinetics Of

The aim of this paper was to determine the resistance to high-temperature corrosion in atmosphere of air for alloy Fe-40Al-5Cr-0.2Ti-0.2B. Corrosion tests were conducted in temperatures from 600 to 900°C in time from 2 to 64 hours. Conducted tests have shown a slight increase of weight of samples in periods of time which followed. Increase of weight is connected with corrosion products in the form of passive oxides which form on the surface of the alloy. Kinetics of corrosion processes has parabolic course in tested temperature range which proves the formation of passive layers of corrosion products on the surface of samples. Heat resistance of the alloy on intermetallic phase matrix FeAl brings about potential possibilities to apply this alloy as a material meant for work in elevated and high temperatures in the environment which includes oxygen.

High-Temperature Oxidation of Stainless Steels

MRS Bulletin ◽  
1994 ◽  
Vol 19 (10) ◽  
pp. 23-25 ◽  
Author(s):  
J.C. Colson ◽  
J.P. Larpin
Keyword(s):  
High Temperature ◽  
Stainless Steels ◽  
Diffusion Processes ◽  
Short Circuit ◽  
High Temperature Corrosion ◽  
Corrosion Products ◽  
Ternary Alloys ◽  
Low Carbon ◽  
Scale Growth ◽  
Temperature Oxidation

The first stainless steels, mainly low carbon chromium-iron alloys, have been known since the beginning of this century. These steels show good resistance against wet corrosion and high-temperature corrosion. This article focuses on high-temperature corrosion, with emphasis on gaseous sulfidizing and oxidizing environments. The discussion is limited to these two gases since corrosion involving halogen-and/or carbon-containing gases involves other specific processes. The behavior of binary and ternary alloys will be successively examined, then the role of minor elements will be considered.Fundamental Mechanisms of High-Temperature Corrosion of Stainless SteelUsually, a dry corrosion process results in the formation of corrosion products, giving a simple or complex oxide or sulfide scale on a metallic substrate, separating it from the aggressive gaseous environment and, consequently, acting as a protective barrier. Scale growth is controlled by the conductivity of the reaction products which are solid electrolytes. Generally, the mechanism of scale growth is governed by outward cation or inward anion diffusion processes. This is the basis of the model originally put forward by Wagner for a single metal and subsequently developed for alloys, and particularly, for stainless steels. This one-way point-defect diffusion process is responsible for the observed parabolic scaling kinetics characterized by a parabolic rate constant kp. This model is well described in the literature.In the case of stainless steels, formation of a protective scale is required; this is possible if the oxide or sulfide products have a low diffusivity to cations or anions due to a low density of point defects in the crystal lattice. The protective characteristics of the corrosion products may be experimentally determined by measurement of their electrical conductivity, although the scales should also be effective against short-circuit transport of ions, atoms, or molecules. The best barriers consist of oxides, such as Al2O3, SiO2, and Cr2O3.

scholarly journals High Temperature Corrosion Kinetics of Ni-Cr Alloys in HCl-containing Atmosphere

1998 ◽  
Vol 47 (5) ◽  
pp. 313-319
Author(s):  
Yoshiyuki Sato ◽  
Motoi Hara ◽  
Toshio Narita
Keyword(s):  
High Temperature ◽  
High Temperature Corrosion ◽  
Corrosion Kinetics ◽  
Kinetics Of

Characterisation of high temperature corrosion products on FeAl intermetallics by XPS

2001 ◽  
Vol 43 (10) ◽  
pp. 1891-1903 ◽  
Author(s):  
C.-H Xu ◽  
W Gao ◽  
M Hyland ◽  
H Gong
Keyword(s):  
High Temperature ◽  
High Temperature Corrosion ◽  
Corrosion Products

scholarly journals In-situ study of high temperature corrosion kinetics of iron using a fast X-ray diffraction method

1993 ◽  
Vol 03 (C9) ◽  
pp. C9-461-C9-467 ◽  
Author(s):  
M. Juez-Lorenzo ◽  
V. Kolarik ◽  
N. Eisenreich ◽  
W. Engel ◽  
A. J. Criado
Keyword(s):  
High Temperature ◽  
Diffraction Method ◽  
High Temperature Corrosion ◽  
X Ray Diffraction ◽  
X Ray ◽  
In Situ Study ◽  
Corrosion Kinetics ◽  
Kinetics Of

scholarly journals High Temperature Corrosion Behaviors of 20G Steel, Hastelloy C22 Alloy and C22 Laser Coating under Reducing Atmosphere with H2S

Coatings ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 617 ◽  
Author(s):  
Zongde Liu ◽  
Congcong Liu ◽  
Yuan Gao ◽  
Chao Zheng
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Manganese Oxides ◽  
Mass Gain ◽  
High Temperature Corrosion ◽  
Corrosion Products ◽  
Uniform Corrosion ◽  
Low Nox Combustion ◽  
Corrosion Behaviors ◽  
Laser Coating

High-temperature corrosion behaviors of 20G steel, Hastelloy C22 alloy and C22 laser coating was evaluated by corrosion mass gain measurements at 450 °C. The corrosive atmosphere is 0.2 vol% H2S–0.1 vol% O2–N2, which simulated the severe high-temperature corrosion environment occurred under low-NOx combustion in pulverized-coal furnaces. Experimental results showed that the corrosion resistance of the C22 laser coating and the C22 alloy was obviously better than 20G steel. Furthermore, it should be noted that the C22 laser coating fabricated in this study displayed a higher corrosion resistance than the commercial C22 alloy although they had the same chemical composition. The severe pitting corrosion was observed in 20G steel with the corrosion products consisting of FeS2, Fe2O3 and Fe3O4. The C22 alloy and C22 laser coating exhibited the uniform corrosion and their main corrosion products were NiS2, CrS and a small amount of chromium and manganese oxides.

scholarly journals CHAPTER 1 Thermodynamics and Kinetics of the High Temperature Oxidation of Stainless Steels

2020 ◽  
Vol 300 ◽  
pp. 1-24
Author(s):  
Somrerk Chandra-ambhorn ◽  
Thammaporn Thublaor ◽  
Celine Pascal
Keyword(s):  
High Temperature ◽  
Stainless Steels ◽  
High Temperature Oxidation ◽  
High Temperature Corrosion ◽  
Temperature Oxidation ◽  
Thermodynamics And Kinetics ◽  
Thermal Oxide ◽  
The Stability ◽  
Kinetics Of

This chapter introduces stainless steels and their classification for the high temperature applications. The enabling theories for the high temperature corrosion i.e. thermodynamics and kinetics are further addressed. The basic concept of thermodynamics is given and the stability of the formation of thermal oxide on stainless steel is exemplified. Types of defect in the oxide and Fick’s first law for the diffusion of defect though the oxide are introduced. Oxidation kinetics is explained with the emphasis on the derivation of the parabolic rate law.

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