Abstract
Thermally sprayed 316L stainless steel coatings are commonly used on metallic structures due to their corrosion and wear resistance when compared to carbon steel. Cold Gas Spray (CGS) is a convenient thermal spray process to deposit 316L coatings, producing thick and very dense coatings, with almost no deleterious changes on the feedstock properties to the coating condition. The powder characteristics have influence on the microstructure of the coating, such as porosity and oxide contents, which alter its corrosion and wear behavior. CGS is an efficient technique to reduce the problems associated with material melting commonly found in other conventional thermal spray methods. In this work, different 316L powders, produced by different manufacturers, were deposited by CGS, applying the same equipment and parameters, with the objective to evaluate the relation between the powders’ characteristics and coating properties. Their microstructure, adherence, hardness, as well as the performance on corrosion and wear testing were evaluated. The water atomized powders presented in general better results than gas atomized powders.
Highlights
Characteristics on 316L Stainless SteelMetallic components and/or metallic structures are exposed to different conditions during their lifetime
The abrasion resistance of a material is directly related to its Youngs modulus (E), hardness, toughness, and compactness as presented by Fu, Li, and Li [59]
316L-APS coating showed the lower abrasion resistance, which can be directly related to its physical properties, as this was the coating with the highest porosity and the lowest adhesion strength among the coatings prepared
Summary
Characteristics on 316L Stainless SteelMetallic components and/or metallic structures are exposed to different conditions during their lifetime. The operational and environmental conditions must be considered during their design, fabrication, maintenance and inspection steps, since wear or corrosion could occur in working conditions. For this reasons, the application of coatings on the new components have been widely used, employing different techniques, such painting, galvanizing, Physical Vapor Deposition (PVD), Chemical Vapor Deposition (CVD), welding, thermal spraying, and other processes [1,2,3,4]. Since the starting powders used in CGS remain in the solid state during the deposition, the most common defects of the high-temperature thermal spray processes, such phase transformation or oxidation, can be avoided [8,9,10,11]
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