Aluminum Anodizing Process Guide

aluminum anodizing

Aluminum Anodizing Process Guide from TopWio.Aluminum anodizing is an electrochemical process in which an oxide (anodic) layer is chemically built on the surface of the metal. Coatings of thickness 1.8 μm to 25 μm are known as Type II, and coatings thicker than 25 μm (0.001″) are known as Type III, hard anodizing,hardcoat .

Aluminum alloys are anodized to increase corrosion resistance, to allow dyeing in a wide variety of colors, to increase surface hardness. The anodic layer improves lubrication and is non-conductive, along with an excellent substrate for decorative finishes.

Anodized aluminum parts can also be treated to make them sufficiently electrically conductive to suppress discharges of static electricity. The treatment was conceived as a means of preventing static electric discharges on exterior satin-anodized aluminum surfaces of spacecraft without need to apply electrically conductive paints

Aluminum Anodizing Process

Preceding the anodization process, wrought alloys are cleaned in either a hot soak cleaner or in a solvent bath.Cast alloys are normally best just cleaned due to the presence of intermetallic substances.

The anodized aluminum component layer is grown by passing a direct current through an electrolytic solution, with the aluminum object serving as the  positive electrode. The current releases hydrogen at the negative electrode and oxygen at the surface of the aluminum anode, creating a build-up of aluminum oxide. The voltage always fall in the range of 15 to 21 V.

Conditions such as electrolyte concentration, solution temperature, and current must be controlled to allow the formation of a consistent oxide layer.

Nowadays aluminum aircraft parts architectural materials, and consumer items are anodized. Anodized aluminum can be found on flashlights, cookware, cameras, sporting goods, window frames, roofs,and on many other products both for corrosion resistance and the ability to retain dye.

aluminum anodized parts

The anodic coating types and classes are:

1,Type I Chromic acid anodizing (conventional)
2,Type II Sulfuric acid anodizing (conventional)
3,Type III Hard anodize
4,Class 1 Non-dyed
5,Class 2 Dyed
Type II is of particular interest to engeering designer wishing for both of form and function.

Avoid the following condition when designing an anodized finish:

blind holes
hollow weldments
steel inserts
sharp corners
heavy to thin cross sections

aluminum anodizing part

Advantages of Anodic coatings

1.High Wear Resistance:The wear or abrasion resistance of aluminum anodic coatings is one of the most important characteristics of hard anodized aluminum. Anodized aluminum is used for such components as pistons, cylinders, and hydraulic gear
2.Type III (hardcoat) hardness exceeds wear characteristics of other hard coatings such as hard chrome.
3.Heat Dissipation: Anodized aluminum>bare aluminum. Black dyed anodize>clear anodize
4.Anodic coatings can also be used as a base layer for Teflon impregnation

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