What is anodizing?
Anodize is a coating of aluminum oxide that is grown from the aluminum by passing an electrical current through an acid electrolyte bath in which the aluminum is immersed. The coating thickness and surface characteristics are tightly controlled to meet end product specifications. Aluminum oxide is an extremely hard material that approaches the hardness of a diamond. As a result, the aluminum oxide layer provides excellent wear and corrosion protection.
What is the purpose of anodizing?
General reasons for anodizing are: wear resistance, corrosion resistance, surface lubricity, heat dissipation, dielectric (non-conductive) properties, adhesion, and aesthetics.
Is anodizing environmentally friendly?
Yes, anodize does not entail the use of heavy metals nor does it produce toxic waste. Anodize meets the environmental and safety directives of the FDA, USDA, ELV, WEEE and RoHS.
What substrates or base metals can be anodized?
The three substrates that can be anodized are aluminum, titanium, and magnesium. Steel or stainless steel cannot be anodized.
Is there a price difference between conventional and hard anodize?
Hard anodize is more expensive due to increased energy requirements associated with the process. Cost differences are dependent upon many variables in a given order. For example: part size, racking instructions, packaging, etc.
What alloys are best for anodizing?
In general, wrought alloy series 1000-7000 provide the best corrosion and aesthetic properties than cast alloy. Specific alloy choice to match performance needs should be discussed on a case-by-case basis.