The aluminide alloys formed at the surface contain 20% minimum aluminum. Typical case depths:
- Carbon and alloy steel = 5-20 mils
- Stainless and nickel base alloys = 2-10 mills
Corrosion Protection Properties of Aluminizing
- Sulfidation Resistance: steel protection from H2S, SO2 SO3 attack
- Oxidation Resistance: stable aluminum oxide film formed
- Carburization Resistance: prevents carbon diffusion into base metal
- Hydrogen Permeation: diffusion rates of H2 into steel reduced
- Welding of aluminized surfaces can be done using special procedures
Corrosion Protection Applications for Aluminizing
- Refinery Hydrocrackers and Hydrodesulphurizer Units: Stainless catalyst reactor screen, wire cloth and baskets to reduce scaling from sulfidation.
- Sulfur and Sulfuric Acid Plants: Catalyst trays, nickel alloy burner assemblies for resistance to hot H2S, SO2 and SO3 corrosion.
- Gas Plants Using Claus Technology: Reactor and support grating and tubing for H2S, SO2 and O2 resistance.
Corrosion Rate Chart
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