Corrosion Behavior of Inconel 625 Coating Produced by Laser Cladding

• Main Authors: Mieczyslaw Scendo, Katarzyna Staszewska-Samson, Hubert Danielewski
• Format: Article
• Language: English
• Published: MDPI AG 2021-06-01
• Series: Coatings
• Subjects: superalloy; laser cladding; coating; acidic chloride solution; corrosion parameters
• Online Access: https://www.mdpi.com/2079-6412/11/7/759

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.