Erosion and corrosion resistant components and methods thereof
a technology of corrosion resistance and components, applied in the direction of machines/engines, mechanical equipment, liquid fuel engines, etc., can solve the problems of affecting the corrosion resistance of components, the use of materials, and the inability to solve water droplet erosion or corrosion pitting problems, so as to improve the corrosion the effect of improving the corrosion resistance and erosion resistance of articles
Inactive Publication Date: 2014-06-19
GENERAL ELECTRIC CO
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Benefits of technology
The invention improves the resistance of articles to corrosion and erosion, particularly those that are exposed to water droplets. By applying a sacrificial coating that is more anodic than the surface of the article and a polymeric coating that resists erosion, the article becomes more resistant to both corrosion and erosion. This can be beneficial in a variety of situations where the article comes into contact with corrosive or erosive materials.
Problems solved by technology
Electrochemically-induced corrosion and erosion phenomena occurring at the airfoil surfaces can in turn result in cracking of the components due to the cyclic thermal and operating stresses experienced by these components.
Though improvements in erosion and / or corrosion resistance can be achieved through the use of different materials, such as nickel-base or titanium-base alloys, this approach may not solve water droplet erosion or corrosion pitting problems since these materials may also have susceptibility to the associated electrochemical processes.
Other potential drawbacks to the use of materials other than stainless steels include higher costs of their alloy constituents, the need for redesign of the blades, including airfoil surfaces, due to the different metallurgical and mechanical properties of the materials, and issues relating to overall robustness of the blades resulting from potential sensitivity to other degradation phenomena, such as various rub and fretting wear mechanisms.
Method used
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[0014]The present invention will be described below in reference to airfoil components whose airfoil surfaces are protected by a coating system that includes a sacrificial coating and an erosion-resistant coating. The coating system is particularly useful for use within the compressor sections of land-based gas turbine engines, including components such as rotating compressor blades and stationary compressor vanes, shrouds, and other surfaces within the compressor section. The coating system may also be applicable to other components that may be subject to water droplet erosion and / or pitting and crevice corrosion, nonlimiting examples of which include vanes, nozzles and shrouds within the turbine section of a gas turbine engine, combustor liners, diaphragm components, seal components, valve stems, nozzle boxes, nozzle plates, and the like as well as components in steam turbines.
[0015]FIG. 1 schematically represents a compressor blade 1 of a type that may be used in land-based gas t...
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A coating system and a method of applying the coating system on an article. The coating system includes a sacrificial coating on a surface of the article and an erosion-resistant coating on the sacrificial coating, wherein the erosion-resistant coating comprises a layer of a polymeric material. The sacrificial coating is more anodic than the surface or the erosion-resistant coating.
Description
BACKGROUND OF THE INVENTION[0001]The present invention generally relates to coatings capable of exhibiting erosion and / or corrosion resistance. More particularly, this invention relates to coatings suitable for use on airfoil components, including compressor airfoils of gas turbines, to promote the corrosion and erosion resistance thereof and to methods of manufacturing airfoil components with such coatings.[0002]Stainless steel blades, such as those used in the compressors of land-based gas turbine engines used in industrial applications (for example, power generation), have shown susceptibility to erosion and corrosion pitting of their airfoil surfaces that are believed to be associated with various electrochemical dissolution processes enabled by the impingement of water droplets and chemical species present in the droplets, intake air, and combinations thereof. Electrochemically-induced corrosion and erosion phenomena occurring at the airfoil surfaces can in turn result in crack...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C23F13/18C23F13/14
CPCC23F13/14C23F13/18F01D5/288F05D2300/43F05D2300/501F05D2300/603F04D29/023F04D29/324
Inventor LIPKIN, JANE MARIEPAREEK, VINOD KUMAR
Owner GENERAL ELECTRIC CO