Erosion and corrosion resistant coatings for exhaust gas recirculation based gas turbines

摘要

A compressor blade for use in a compressor section of a gas turbine engine, comprising: a martensitic stainless steel compressor blade and an abrasive coating having an anodic component. The compressor blade has a blade portion, a dovetail portion and a platform portion intermediate the blade portion and the dovetail portion, the blade portion terminating in a tip opposite the dovetail portion. A cobalt-based coating overlies at least the blade portion of the compressor blade. The cobalt-based coating comprises a cobalt based material that includes precipitates of tungsten carbide that provide erosion resistance and particles of a sacrificial metal-based material distributed through the cobalt-based coating that provide galvanic corrosion resistance to the system.

主权项

1. A wear component, comprising:
a martensitic stainless steel base material; and a cobalt-based wear coating overlying the martensitic stainless steel base material, wherein the cobalt-based wear coating comprises a cobalt based alloy that includes precipitates of tungsten carbide; wherein the cobalt-based wear coating further includes particles of a sacrificial metal-based material comprising NiO distributed through the cobalt-based coating; and wherein the sacrificial metal-based material acts as an anode to prevent galvanic corrosion of the martensitic stainless steel base material in a corrosive environment.