Application of Sacrificial and Protective Coatings

 

Gas Turbine Resources provide sacrificial aluminide coating services generally focused toward compressor rotor and stationary stator or nozzle vanes to improve resistance to airborne contaminates, chemical elements and salt corrosion attack associated with marine environments . We typically employ a “Smoothseal” coating application which cures to provide a low micron surface finish. “Smoothseal” is applied over an initial Ipcote base coat and may also be treated with a final top coat layer or sealer coat for further enhancement of surface finish quality. By nature coatings of this type offer reduced surface porosity maintain good sacrificial properties, are non electrically conductive and offer improved contaminant shedding ability resulting in reduced fouling and compressor degradation over time. 

The image below show a machine compressor treated with Smoothseal coating application.

 

 

Thick-Film: Thermally Applied Coating Services

The processes that are used to create these coatings are often referred to as metallizing, plasma spraying, metal spraying, arc spraying or ceramic coating. Each of these applies a subset of the entire process of applying a coating of metal, oxide, ceramic, carbide or composite material to a substrate using heat. 

These processes can be summarised as

  • Aluminising or Diffusion of Aluminium into a substrate
  • HVOF - High velocity Oxygen Fuel
  • EBPVD- Electron Beam Physical Vapour Deposition

For HVOF and EBPCD material with a liquid phase is prepared in either wire or powder form. This material is delivered to a heat source, where it melts and is atomized into a spray that is projected towards the prepared substrate. When the individual particles strike the intended surface they lose their heat to the substrate and solidify, building up a coating.  The purpose of the coating may be to restore dimensions to a worn part, improve wear resistance, provide corrosion or oxidation resistance, modify electrical conductivity or resistivity, or provide thermal insulation. 

  • Platinum Plating

Coating the surface of a turbine component with platinum can significantly increase corrosion resistance, this may be a stand-alone coating or equally it may be combined with other processes such as Aluminising.

Contact us for further information or informal discussion about the benefits of coating applications that may suit your requirements