The process of dipping anodized parts in hot water is known as

Anodizing

• Anodizing is an electrolytic passivation process used to increase the thickness of the natural oxide layer on the surface of metal parts
• The process derives its name from the fact that the aluminium part to be coated becomes the anode in an electrolytic cell.
• Anodizing refers to conversion coating of the surface of aluminium and its alloys to porous aluminium oxide.
• Anodic films are most commonly applied to protect aluminium alloys, although processes also exist for titanium, zinc, magnesium, zirconium etc
• This differentiates it from electroplating, in which the part is made the cathode.
• Aluminium is ideally suited to anodizing, although other non-ferrous metals such as magnesium and titanium also can be anodized.
• The corrosion results suggest that the sealing treatment can significantly improve the corrosion resistance of anodized Mg alloys.
• In fact, the sealing technique can also be applied to a phosphate coating to obtain improves corrosion performance.