hvof coatings
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CORROSION ◽  
10.5006/3957 ◽  
2021 ◽  
Author(s):  
sakthivel kandaiah

Herein we report the electrochemical corrosion behavior of pre and post heat-treated composite coatings of NiCrMoFeCoAl-30%SiO2 and NiCrMoFeCoAl-30%Cr2O3 on ASTM SA213-T22 boiler tube steel by high velocity oxygen fuel (HVOF) spraying technique. The samples were subjected to hot molten salt (Na2SO4–60%V2O5) corrosion environment in a tubular furnace at 7000C under thermocyclic conditions. The microscopic, structural and electrochemical investigations of post-heat treated specimens reveal NiCrMoFeCoAl-30%Cr2O3 composite HVOF coating exhibits a superior corrosion resistance compared to NiCrMoFeCoAl-30%SiO2 composite coating and bare ASTM SA213-T22 steel boiler tube steel in neutral electrolyte. The room temperature potentiodynamic and impedance investigations of heat-treated samples suggest high interfacial charge transfer resistance for HVOF coatings over a wide anodic potential window. This could be ascribed to the protective nature of the chromium oxide containing coatings on high temperature treatment. AC impedance analysis reveals NiCrMoFeCoAl-30%Cr2O3 coating exhibits very high resistive behaviour with very high charge transfer resistance, in the order of 106 Ohm higher than the NiCrMoFeCoAl-30%SiO2 coating and uncoated ASTM SA213-T22 steel boiler tube steel. Furthermore, the high temperature induced formation of metal chromates/chromites along with the presence of Cr2O3 provides good resistance towards corrosion.



Author(s):  
K. Raghavendra Naik ◽  
R.K. Kumar ◽  
V. Saravanan ◽  
S. Seetharamu ◽  
P. Sampathkumaran


2021 ◽  
Vol 1147 (1) ◽  
pp. 012032
Author(s):  
M Löbel ◽  
T Lindner ◽  
N Hanisch ◽  
T Lampke




Author(s):  
N. Abu-warda ◽  
G. Boissonnet ◽  
A.J. López ◽  
M.V. Utrilla ◽  
F. Pedraza


2021 ◽  
Vol 1017 (1) ◽  
pp. 012010
Author(s):  
Alok Vats ◽  
Amar Patnaik ◽  
M L Meena ◽  
Dinesh Shringi


Wear ◽  
2021 ◽  
Vol 464-465 ◽  
pp. 203553
Author(s):  
Priyadarshini Jayashree ◽  
Simone Turani ◽  
Giovanni Straffelini


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