Hot Corrosion


Hot corrosion of surfaces is prevalent in many industrial processing environments including those exposed to molten metal (aluminum, zinc), high-temperature steam, and molten salts.  These are known to corrode advanced alloys aggressively with devastating effects.  Cerablak® UTF and Cerablak® HTS offer excellent protection against hot corrosion up to 1200°C in oxidizing and reducing environments.

Hot Corrosion 
Corrosion by molten media is the most aggressive degradation process faced by metals/alloys and ceramics (such as refractories used in metal casting).  Due to lack of a solid passivation layer on the substrate, rapid degradation can occur. Protective treatments need to be inert to molten media while serving as an effective barrier against oxidation. Potential applications include:

 

Molten metal and sulfate attack of porous refractory insulation.

Sulfate attack of fireside boiler tubes found in industrial combustion furnaces (above).

• Braze and weld areas containing multiphase alloy constituents, which are prone to high-temperature galvanic corrosion.

Molten silicate (CMAS) corrosion of ceramic TBCs and advanced metal alloys. 

 

High Temperature Corrosion Barrier
Cerablak® coatings mitigate and prevent high-temperature corrosion processes. Excellent coverage ability of Cerablak® surface treatments, along with thermal and environmental stability, provides robust corrosion protection. Cerablak® UTF and Cerablak® HTP-treated metals have an impervious and inert glassy surface. Cerablak® UTF-coated braze joints are resistant to galvanic corrosion due to the electrically insulating coating.  Cerablak® HTS seals internal surfaces in highly porous bodies such as refractory bricks and liners, enamel coatings, and zirconia TBCs.