Calorizing

Definition - What does Calorizing mean?

Calorizing is an industrial surface modification process used to create aluminum diffusion coatings. Calorizing is performed by diffusing aluminum into steel. This process forms an alloy with ideal heat and corrosion resistance properties.

Corrosionpedia explains Calorizing

Calorizing refers to the use of pack cementation diffusion processes to facilitate the production of aluminide alloys on a base metal surface. These alloys serve as a coating material to provide surface protection against corrosion for the base metal.

Calorizing is performed by positioning the steel in a retort and immersing it in a mixture of blended aluminum powders. It is then completely sealed and placed in a temperature-regulated furnace. At extremely high temperatures, the aluminum diffuses into the steel, generating a steel substrate. Once cooled, the steel is removed and secondary operations such as trimming and straightening are performed.

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