Investigation on the effect of various surface preparations on corrosion performance of powder coated steel by EIS

2005 ◽  
Vol 56 (5) ◽  
pp. 325-328 ◽  
Author(s):  
M. M. Attar ◽  
R. Naderi ◽  
M. H. Moayed
Keyword(s):  
Coated Steel ◽  
Corrosion Performance

Some Observations Regarding Erosion-Corrosion Performance of HVOF-Sprayed Cr3C2- NiCr and Cr3C2- NiCr-(25) WC-Co Coatings in Actual Boiler Environment

2007 ◽  
Vol 26-28 ◽  
pp. 1345-1348 ◽  
Author(s):  
Manpreet Kaur ◽  
Harpreet Singh ◽  
Satya Prakash
Keyword(s):  
Weight Change ◽  
Thermal Power ◽  
Coated Steel ◽  
Oxide Scales ◽  
Corrosion Performance ◽  
Boiler Steel ◽  
X Ray ◽  
Uncoated Steel ◽  
Erosion Corrosion ◽  
Boiler Environment

Cr3C2- NiCr and Cr3C2- NiCr-(25) WC-Co coatings were deposited on T22 boiler steel by High Velocity Oxy-Fuel (HVOF) Technology. The coated as well as the uncoated steel samples were exposed to the actual boiler environments in a thermal power plant for 1500 hrs under cyclic conditions to evaluate their erosion-corrosion performance. Weight change measurements were taken for each sample after every 100 hrs. It has been observed that the weight change trends for coated steel with Cr3C2- NiCr and Cr3C2- NiCr-(25) WC-Co coatings followed a parabolic trend. The exposed samples were physically investigated for any macroscopic changes after each cycle of 100 hours. The uncoated steel showed blisters and spallation of its oxide scale, whereas the coated samples exhibited intact oxide scales, in general. Scanning Electron Microscopy/Energy Dispersive X-Ray Analysis (SEM/EDAX) was done to characterize morphology of the oxide scales. The protective nature of coatings has been explained based on the results of the study.

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