A new approach to improve high temperature corrosion resistance of thermally sprayed coatings by using electrochemical corrosion tests

2010 ◽  
Vol 62 (7) ◽  
pp. 623-634 ◽  
Author(s):  
T. Neddemeyer ◽  
M. Mocker ◽  
M. Faulstich
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Electrochemical Corrosion ◽  
High Temperature Corrosion ◽  
New Approach ◽  
Corrosion Tests ◽  
Thermally Sprayed Coatings ◽  
Thermally Sprayed ◽  
Sprayed Coatings

scholarly journals Exploring the Effect of Silicon on the High Temperature Corrosion of Lean FeCrAl Alloys in Humid Air

2021 ◽  
Author(s):  
T. Sand ◽  
A. Edgren ◽  
C. Geers ◽  
V. Asokan ◽  
J. Eklund ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Oxidation Behavior ◽  
High Temperature Corrosion ◽  
The Other ◽  
Oxide Scales ◽  
Protective Oxide ◽  
New Approach ◽  
Fecral Alloys ◽  
Cr Evaporation

AbstractA new approach to reduce the chromium and aluminium concentrations in FeCrAl alloys without significantly impairing corrosion resistance is to alloy with 1–2 wt.% silicon. This paper investigates the “silicon effect” on oxidation by comparing the oxidation behavior and scale microstructure of two FeCrAl alloys, one alloyed with silicon and the other not, in dry and wet air at 600 °C and 800 °C. Both alloys formed thin protective oxide scales and the Cr-evaporation rates were small. In wet air at 800 °C the Si-alloyed FeCrAl formed an oxide scale containing mullite and tridymite together with α- and γ-alumina. It is suggested that the reported improvement of the corrosion resistance of Al- and Cr-lean FeCrAl’s by silicon alloying is caused by the appearance of Si-rich phases in the scale.

Corrosion Behavior of WC-Co Cermet Coatings

2015 ◽  
Vol 819 ◽  
pp. 87-90 ◽  
Author(s):  
Zakiah Kamdi ◽  
C.Y. Phang ◽  
H. Ahmad
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Alkaline Electrolyte ◽  
Electrochemical Test ◽  
Cermet Coatings ◽  
Wear And Corrosion ◽  
Thermally Sprayed Coatings ◽  
Wear And Corrosion Resistance ◽  
Thermally Sprayed ◽  
Sprayed Coatings

Metal-ceramic composite or cermet coatings have become popular due to their enhanced wear and corrosion resistance properties. Cermet consists of ceramic particulate embedded in a metallic binder. WC-Co coatings are often used in applications that require wear resistance, but there are many applications in which thermally sprayed coatings have been deposited on components that operate under both abrasive and corrosive condition. Thus, in this study, the corrosion behavior of WC-12wt%Co in different electrolyte has been evaluated. Electrochemical test has been done in three electrolytes namely 0.5 M hydrochloric acid, HCl, 0.5 M sulfuric acid, H2SO4 and 0.5 M sodium hydroxide, NaOH. It is found that corrosion potential of this coating in acidic environment is more positive compares to in alkaline environment. Both in acid and alkaline electrolyte, binder dissolution were preferential. It may be concluded that this coating have higher corrosion resistance in alkaline electrolyte than in acid electrolyte.

High Temperature Corrosion of Al3Ti-Cr Intermetallics in SO2 Atmosphere

2006 ◽  
Vol 15-17 ◽  
pp. 398-403
Author(s):  
Jee Hoon Choi ◽  
Dong Bok Lee
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Oxide Scale ◽  
Thermomechanical Treatment ◽  
Oxidation Reaction ◽  
Alumina Scale ◽  
High Temperature Corrosion ◽  
Induction Melting ◽  
Internal Corrosion ◽  
Corrosion Tests

L12-type Al65.5Ti24.4Cr10.1 alloys were prepared by induction melting followed by thermomechanical treatment. Corrosion tests were performed between 1173 and 1373 K in a flowing Ar-1% SO2 atmosphere for up to 150 hr. The corrosion proceeded mainly via the oxidation reaction. The oxide scale was primarily composed of Al2O3, together with a small amount of TiO2 that appeared mainly in the lower part of the oxide scale during the latter stages of corrosion. The formation of the highly stoichiometric, slowly growing alumina scale on the surface significantly improved the corrosion resistance of the alloys. Neither internal corrosion products nor sulfides were detected.

High Temperature Corrosion of Superheater Materials in Chlorination-Oxidation Atmosphere

2013 ◽  
Vol 718-720 ◽  
pp. 52-58
Author(s):  
Sheng Huan Sang ◽  
Yu Feng Duan ◽  
Hui Chao Chen ◽  
Chang Sui Zhao
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Unit Area ◽  
Mass Gain ◽  
High Temperature Corrosion ◽  
Corrosion Process ◽  
Waste Plastic ◽  
Corrosion Tests

Corrosion experiments were carried out with metals 20G, 15CrMoG and 12Cr1MoVG under the simulated atmosphere (N2-5%O2-1500μL/L HCl) of superheaters in waste plastic boilers to choose appropriate materials preventing high temperature corrosion. Corrosion dynamic curves were plotted by mass gain per unit area. Metal specimens after corrosion tests were analyzed by SEM-EDS and XRD. The results show that 20G has the poorest anti-corrosion abilities among the three materials; the corrosion process is involved in activation oxidation of chlorine. Addition of Cr in alloys can improve their corrosion resistance in the mixed atmosphere.

scholarly journals High-temperature corrosion behavior of TP91, C22 alloy and C22 based on laser coatings in simulated reducing corrosion environment

2021 ◽  
Author(s):  
CongCong Liu ◽  
Zongde Liu ◽  
Yuan Gao ◽  
Xinyu Wang ◽  
Chao Zheng
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Corrosion Behavior ◽  
Corrosive Medium ◽  
High Temperature Corrosion ◽  
Dense Layer ◽  
Corrosion Tests ◽  
The Matrix ◽  
Reducing Environment ◽  
Low Nitrogen

Abstract To explore corrosion characteristics of TP91, C22 alloy and C22 laser coatings in reducing environment caused by low-nitrogen combustion at 500°C-600°C, a synthetic corrosive medium containing 0.2 vol. % H2S-0.1 vol. % O2-N2 were selected. Results showed that the order of corrosion resistance is: C22 laser coatings>C22 alloy>TP91. 550°C was the limit corrosion temperature for C22 alloy and C22 laser coatings. The reason for the strong corrosion resistance of C22 alloy and C22 laser coatings is that a dense layer of Cr-rich corrosion products due to the is produced in the inner layer, thus protecting the matrix from direct corrosion by corrosive gas. Finer grains before corrosion tests and the formation of dense Cr2O3 inner layers in much speedier process were the main reasons for the best corrosion resistance of C22 laser coatings.

Subsequent sealing of thermally sprayed coatings to increase corrosion resistance

1994 ◽  
Vol 10 (1) ◽  
pp. 46-51 ◽  
Author(s):  
E. Lugscheider ◽  
P. Jakiel ◽  
V. Messerschmidt ◽  
G. Beckschulte
Keyword(s):  
Corrosion Resistance ◽  
Thermally Sprayed Coatings ◽  
Thermally Sprayed ◽  
Sprayed Coatings ◽  
Increase Corrosion Resistance
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