What is anodization process?
Anodizing is an electrochemical process that converts the metal surface into a decorative, durable, corrosion-resistant, anodic oxide finish. Aluminum is ideally suited to anodizing, although other nonferrous metals, such as magnesium and titanium, also can be anodized.
What is the purpose of anodization?
Anodizing is a method for changing the surface chemistry of metals and other substrates. It protects against corrosion, enhances aesthetic qualities, resists scratching and is one of the most durable surface finishes available.
What products are anodised?
Appliances such as refrigerators, dryers, coffee brewers, ranges, televisions, microwave equipment. Vents, awnings, dust covers, light fixtures, storm doors, window frames, mailboxes, bathroom accessories, patio covers, and wall switch plates for buildings.
What are the types of anodizing?
There are different types of anodizing, most commonly referred to as Type I-Chromic Acid Anodize, Type II-Sulfuric Acid Anodize, and Type III Hard Anodize or Hardcoat from the Mil-A-8625 designation. Other less common types are phosphoric acid and titanium anodize.
Which metals can be anodised?
Aluminum, aluminum alloys, magnesium, titanium and stainless steel can be anodized. Aluminum is by far the most common due to its high strength to weight ratio and availability. Anodized aluminum is capable of achieving many colors as dyes can be used to get the desired shade.
What are the benefits of anodizing aluminum?
Anodizing offers a large increasing number of gloss and color alternatives and minimizes or eliminates color variations. Unlike other finishes, anodizing allows the aluminum to maintain its metallic appearance. Cost. A lower initial finishing cost combines with lower maintenance costs for greater long-term value.
Which compound is formed during anodizing process?
Anodising is the process of submerging the metal in an acidic solution, and applying a voltage to promote the absorption of oxygen into the surface. In the case of anodising aluminium, this causes the formation of the hard ceramic compound, Aluminium Oxide.
What is electrolyte in anodizing?
Three types of electrolyte solution are commonly used with the anodising process. The first is a 10-15% solution of sulphuric acid at 25°C. This electrolyte gives a coating formation rate of about 25µm/hr. The second electrolyte solution is a mixture of sulphuric acid and oxalic acid at 30°C.