Use the SermaLoy coating application service to extend the life of your components. 
SermaLoy J is a unique slurry applied aluminide diffusion coating specifically designed for protection of gas turbine hot section components and industrial components suffering from hot corrosion. It is applied to the component surface, then diffused. This results in a coating that adheres tightly to the part surface and is very resistant to both low and high temperature hot corrosion and oxidation.

SermaLoy J is a diffused slurry aluminide coating with a unique silicon-enriched outer layer. It is effective in protecting components at temperatures up to 1835°F (1000°C).

Benefits of SermaLoy J include:

• Excellent resistance to both high and low temperature hot corrosion (LTHC and HTHC)
• Excellent resistance to high temperature oxidation
• Excellent resistance to particulate erosion
• Compatibility with most nickel and cobalt based superalloys, as well as austenitic stainless steels
• Flexibility of diffusion processing that eliminates the need for resolutioning/precipitation/aging heat treatments
• Particularly effective in marine environments.

SermaLoy J is an intermetallic nickel aluminide with a silicon-enriched outer layer. The presence of silicon on the surface of the coating promotes the formation of a tightly adherent scale of very pure aluminum oxide (Al2O3) that is very resistant to dissolution by the liquid sulfate salts that cause hot corrosion. The excellent high temperature oxidation resistance of SermaLoy J is due in part to reduced oxygen mobility through the pure alumina as well as to the stabilizing effect that the silicon has upon the aluminde.

Silicon in SermaLoy J also helps prevent thermal fatigue cracking. Thermally induced strains caused by unequal rates of heating and cooling of the surface and interior of a component are a common cause of degradation in conventional alummide coatings. Cracking almost always originates within these coatings and propagates into the base metal. In SermaLoy J, if cracking does occur, it tends to be arrested at the inter-diffusion zone and does not propagate into the substrate.

With the SermaLoy J slurry aluminizing process, each component is coated individually, thus each can be inspected before diffusion. At this intermediate stage, repair or rework of the slurry coating can be accomplished without any loss of base metal. Using a slurry also greatly simplifies masking and allows selective coating of very localized regions – which is ideal for repair – or alternatively, large areas like ducts and burner cans.

Email to request Technical Papers on SermaLoy J and specify which papers you are interested in:

• "Slurry Aluminide Coating Processes For Gas Turbine Components at Overhaul"
  [REP-8]
• "Performance of a Silicon-Modified Aluminide Coating in High Temperature Hot Corrosion Test Conditions" [REP-16]
  
  

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