Oxide Dispersion

Chromium Oxide Dispersion is a chemical element with symbol Cr and atomic number 24. It is the first element in Group 6. It is a steely-grey, lustrous, hard and brittle metal which takes a high polish, resists tarnishing, and has a high melting point. Chromium metal is of high value for its high corrosion resistance and hardness.

Chromium Oxide Dispersion are hard and their general use is to provide hard wear-resistant coatings on parts that need to be protected. When combined with a protective metal matrix, corrosion-resistant as well as wear-resistant coatings can be developed that are easy to apply and cost effective. These coatings are applied by either welding or thermal spray. When combined with other carbides, chromium carbide can be used to form cutting tools.

Chromium Oxide Dispersion trend in the welding industry, which is moving from the use of stick electrodes to flux cored wire is benefiting chromium carbide. Chromium carbide is used almost exclusively in flux cored wire instead of high carbon ferrochrome as it does not suffer from the dilution effect caused by the extra iron in the high carbon ferrochrome. This means that a coating containing a greater number of hard chromium carbide particles can be produced, which exhibits greater wear resistance.

Chromium Oxide Dispersion new application for thermally sprayed coatings is as replacements for hard chrome plating. Hard chrome plating can produce a wear resistant coating with good surface finish at low costs. The chromium coating is obtained by submerging the item to be coated in a tank of chemical solution containing chromium. An electric current is then passed through the tank causing the chromium to deposit onto the part and form a coherent coating. However, there are growing environmental concerns associated with the disposal of the effluents from the used plating solution and these concerns have caused the cost of the process to increase.

Chromium Oxide Dispersion Diamalloy powders are characterized by their ability to provide wear, oxidation and hot corrosion resistance at elevated temperatures. The addition of NiCr cladding improves corrosion properties. Higher NiCr content results  increased fracture toughness of the coatings.