Study of the microstructure of NiCr splats plasma sprayed on to stainless steel substrates by TEM

2010 ◽  
Vol 204 (9-10) ◽  
pp. 1608-1615 ◽  
Author(s):  
S. Brossard ◽  
P.R. Munroe ◽  
A.T.T. Tran ◽  
M.M. Hyland
Keyword(s):  
Stainless Steel ◽  
Plasma Sprayed ◽  
Steel Substrates

Influence of Preheating Temperature on the Quality of the Interface between Plasma Sprayed Coatings and Substrate

2014 ◽  
Vol 606 ◽  
pp. 183-186
Author(s):  
Monika Vilémová ◽  
Barbara Nevrlá ◽  
Jiří Matějíček ◽  
Radek Mušálek
Keyword(s):  
Stainless Steel ◽  
Plasma Torch ◽  
Water Stabilized Plasma ◽  
Preheating Temperature ◽  
Substrate Preheating ◽  
Plasma Sprayed Coatings ◽  
Plasma Sprayed ◽  
Steel Substrates ◽  
Sprayed Coatings

This study was aimed to investigate the effect of the substrate preheating temperature on the overall quality of the coating/substrate interface. The coatings (stainless steel) were deposited using a water stabilized plasma torch (Institute of Plasma Physics, Prague, i.e. IPP, Czech Republic) on steel substrates. Three sets of samples were prepared under identical spraying and grit blasting condition; substrate preheating temperature was the only parameter which was varied, i.e. preheating to 150°C, 250°C and 350°C. Higher preheating temperature led to a significant increase in the coating adhesion.

scholarly journals Suppression of molten salt corrosion by plasma sprayed Ni3Al coatings

2021 ◽  
Author(s):  
Sarah Yasir ◽  
Jose Luis Endrino ◽  
Elena Guillén ◽  
Adrianus Indrat Aria
Keyword(s):  
Stainless Steel ◽  
Corrosion Rate ◽  
Corrosion Behaviour ◽  
Stainless Steel Surface ◽  
Air Plasma ◽  
Oxide Layers ◽  
Salt Corrosion ◽  
Plasma Sprayed ◽  
Steel Substrates ◽  
Al Coating

AbstractCorrosion behaviour of stainless steel 347 was investigated in a molten nitrate salt (60 wt% NaNO3 + 40 wt% KNO3) immersion at 565 °C for up to 3000 h. A growth of stratified oxide layers consisting of NaFeO2, Fe2O3 and Fe3O4 was observed on the stainless steel surface with a constant gravimetric corrosion rate of ~ 0.4 µm/year. The feasibility of using Ni3Al coatings deposited by means of air plasma spray for suppression of corrosion was investigated. Ni3Al coatings were observed to undergo a fast oxidation with a corrosion rate of ~ 2.7 µm/year in the first 500 h, and subsequently stabilise between 500 and 3000 h with no observable changes in microstructure, composition and weight at a corrosion rate of ~ 0.02 µm/year. The results presented in this study strongly suggest that Ni3Al coating suppresses the formation of oxide layers on the surface of stainless steel substrates and can be used as protection against corrosion in the presence of molten nitrate salts, which is of relevance to thermal energy storage applications.

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