Abstract
Anti-corrosion properties of Inconel 625 (In) laser cladding coatings onto the (S235JR) steel (S) were investigated. The coatings were produced with the use of wire (WIn/S) or powder (PIn/S). The mechanical properties of the Inconel 625 coatings were characterized by microhardness measurements. The PIn/S shows the highest hardness. The surface and microstructure of the specimens were observed by a scanning electron microscope (SEM). The surface analysis of the laser cladding coatings by energy-dispersive spectroscope (EDS) indicated that the structure of the WIn, and PIn coatings depend on its production technique. The microstructure of the WIn and PIn coatings have a dendritic columnar character. Corrosion test materials were carried out by using electrochemical methods. The corrosive environment was acidic chloride solution. It turned out that the PIn/S coating, which was produced by laser cladding method with the use of Inconel 625 powder, has the best anti-corrosion properties in an aggressive chloride environment.
Highlights
Coatings 2021, 11, 759. https://Nickel-based superalloys, including Inconel 625, are currently used in a variety of industries, i.e., aviation, petrochemical, machinery and other industries [1,2].On the other hand, due to the high cost of nickel-based superalloys, their use may be highly unprofitable
The laser cladded specimen was found to have a noticeably better hot corrosion resistance than the TIG cladded and the uncoated specimens
The Vickers hardness of the PIn coating is about 311 HV10, and is about fifty units larger compared to the WIn coating (Table 2)
Summary
Due to the high cost of nickel-based superalloys, their use may be highly unprofitable. One way to reduce component costs is to use nickelbased alloys as coatings to protect cheaper materials. The nickel, as the basic component of superalloys, perfectly protects the substrate of materials against corrosion, especially in aggressive electrolytes, which include acid chloride solutions. Chromium (as the second important component of superalloys) significantly increases the resistance of materials to oxidation, especially in the environment of hot gases containing oxygen sulfur compounds. It is worth adding that the superalloys contain cobalt and molybdenum in small amounts. Both elements play an important role in protecting materials against pitting and crevice corrosion
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
