|
2711 |
|
Thursday, September 29, 2011, Saal C2.1 2:25 PM Corrosion Protection 2 |
|
Characterization of inconel 625 coatings deposited by cold spray |
|
Alberto Pontarollo / Venezia Tecnologie S.p.A., Italy Bernardo Molinas/ Venezia Tecnologie S.p.A., ITALY Alessandro Cafissi/ Venezia Tecnologie S.p.A., ITALY Marco Guidolin/ Venezia Tecnologie S.p.A., ITALY Simone Vezzù/ Civen, ITALY Silvano Rech/ Civen, ITALY Andrea Trentin*/ Civen, ITALY Carlo Peretti/ Venezia Tecnologie S.p.A., ITALY |
|
The high strength nickel alloys and in particular Inconel alloys are extensively used in several applications, spanning from aeronautics to petroleum industry thanks to the combination of their high mechanical properties, thermal and chemical resistance. In particular Inconel 625 is already used in oil pipelines and pipelines of large thermal plants and the possibility to substitute high cost pure Inconel parts with Inconel coated steel parts is of great interest. On this context the first topic to allow the use of coated parts instead of pure Inconel is the capability to provide high corrosion and thermal resistance. The aim of this study is to investigate the capability of Coldspray in the deposition of high strength materials such as Inconel 625 for corrosion protection and comparing the corrosion behaviour of Coldspray coatings with commercial HVOF deposited coatings. Inconel 625 coatings has been deposited by using CGT Kinetic3000 deposition system with nitrogen as carrier gas on AISI316L flat substrates. The coating thickness ranges between 0.3 and 1.0 mm. Different feedstock materials have been used and the effect of powder shape and size distribution on deposition efficiency as well on coating microstructure and porosity have been evaluated. The corrosion behaviour of as-deposited coatings has been studied by electrochemical potentiondynamic analysis and compared with the behaviour of commercially available coatings deposited by HVOF keep as a high-quality benchmark. In particular, the effects of the different coating microstructure due to the different deposition process have been related with the corrosion resistance. Further development and key features are finally outlined in order to candidate the Coldspray as promising technology for the deposition of high-strength nickel alloys. |