Alochrom
Also known as ‘alodining’ or ‘chromating’, alochroming is a chemical process that adds a corrosion-resistant protective coating to aluminium and its alloys, and acts as a primer for painted aluminium.
Although pure aluminium oxidises with air to create its own protective coating, untreated aluminium alloys have little protection against corrosion.
When used in conjunction with anodising, alochroming creates a protective coating on aluminium that doubles its resistance to salt water, compared to anodising alone. Alochromed parts become hydrophobic with age, providing a very high level of long term protection against water or other moisture.