Diffusion Coatings

  

In diffusion coating the surface of a component is enriched with an element or combination of elements that can impart a high degree of resistance to specific wastage mechanisms. These coatings can be highly effective at resisting the effects of elevated temperature corrosion as well as abrasive-type wear. Elements such as chromium, aluminum, silicon and combinations thereof modify the stability of the protective oxide film of the base metal to provide high levels of resistance to the most aggressive elevated temperature corrosion mechanisms, while chromium and boron can combine with other elements in the base metal to produce a very hard surface layer that will resist the effects of abrasive wear. ATC has been awarded a number of patents related to the diffusion of chromium into industrial-type components.

image59

Diffusion Coatings

Chromizing

image60

Two smelt spouts that have been chromized using ATC's process.  This process will increase life of the spouts against a highly corrosive environment.

Boronizing

image61

This piece to a turbine has boron diffused into the blades to increase its resistance to an erosive life.

Aluminizing

image62

 Aluminizing is a thermo-chemical diffusion process applied to carbon, alloy, and stainless steels; nickel-based alloys; and nickel-iron alloys to improve oxidation and corrosion resistance. 

Chromized Boiler Casing

image63

Properties of 310 SS with minimal increase in cost of Carbon Steel.  Most effective in high heat and corrosive areas of the Plant.

Chromized Boiler Fin Bar

image64

 Properties of 310 SS with minimal increase in cost of Carbon Steel.  Most effective in high heat and corrosive areas of the Plant. 

QC performed on end product

image65

QC samples will show diffusion depth and ensure the end product will have adequate resistance to the type of wear the product will be exposed to.