Commercial testing of a unit for high-temperature removal of corrosion products from water coolant

1989 ◽  
Vol 67 (1) ◽  
pp. 515-522
Author(s):  
V. B. Bragin ◽  
D. P. Korostelev ◽  
Yu. B. Murakov ◽  
P. F. Neshkov ◽  
A. K. Orlov ◽  
...  
Keyword(s):  
High Temperature ◽  
Corrosion Products ◽  
Water Coolant ◽  
Commercial Testing

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.

Effect of radiation on release of corrosion products in high temperature aqueous system

1981 ◽  
Vol 18 (3-4) ◽  
pp. 733-740 ◽  
Author(s):  
M. Kawaguchi ◽  
K. Ishigure ◽  
N. Fujita ◽  
K. Oshima
Keyword(s):  
High Temperature ◽  
Aqueous System ◽  
Corrosion Products

Pitting Corrosion of Inconel 600 in High-Temperature Water Containing CuCl2

CORROSION ◽  
1985 ◽  
Vol 41 (11) ◽  
pp. 665-675 ◽  
Author(s):  
J. R. Park ◽  
Z. Szklarska-Smialowska
Keyword(s):  
High Temperature ◽  
Pitting Corrosion ◽  
Chloride Ion ◽  
Open Circuit ◽  
Cupric Chloride ◽  
Corrosion Products ◽  
Chloride Solutions ◽  
Inconel 600 ◽  
High Temperature Water ◽  
Temperature Water

Abstract Pitting corrosion of Inconel 600 was studied in aqueous sodium and cupric chloride solutions at 60 and 280 C. The pit nucleation potential, Enp, was evaluated in two different concentrations of sodium chloride. Enp decreased with increasing concentrations of the chloride ion and with temperature. On specimen surfaces exposed to cupric chloride solutions, pitting occurred at open circuit potentials nearly equal to or higher than the Enp determined by anodic polarization in 0.01 M NaCl solution. The number and size of the pits increased with increasing concentrations of cupric chloride and dissolved oxygen. On specimens partly covered with polytetrafluorethylene (PTFE) tape (i.e., in the presence of artificial crevices), pitting occurred more easily at low concentrations of CuCl2 (≤ 20 ppm CuCl2 in deaerated solutions at 280 C). Tubes covered with oxide films that formed during the operation of model boilers exhibited greater pitting resistance than tubes with clean surfaces at 280 C, but less resistance at 60 C. Corrosion products contained in the pits were enriched in chromium with small amounts of copper, sulfur, and chlorine. The composition of corrosion products covering the pits was similar to that in the pits, but with the additional enrichment of iron. Presumably, sulfur present in Inconel 600 as an impurity was significant in the pitting process. The probable mechanism of the processes leading to pitting of Inconel 600 tubing in high-temperature water is discussed.

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