Tel: +86-371-68085488

E-mail:sales@mintaialuminum.com

Aluminum Sheet
Aluminum Plate
Aluminum Coil
Aluminum Circle
Polished Aluminum Mirror Sheet
Aluminum Foil
Aluminum Tread Plate
Embossed Aluminum Sheet
Coated Aluminum Coil/Panel(PVDF/Polyester)
Copper and Aluminum Composite Sheet/Coil
Aluminum Perforated Panel
Anodising Aluminum Sheet/ Coil
Special Aluminum Products
Aluminum Stocks
Industry News

anodic oxidation

2017-03-16

 anodic oxidation of Aluminum 

Definition

Anodic oxidation: electrochemical oxidation of the metal or the alloy. The aluminum and its alloy in the corresponding
electrolyte and under the specific process conditions, with the effect of the impressed current, the process that a
layer of oxidation film is formed on the aluminum products (anode). If no special demonstration, the anodic oxidation
normally refers to the anodic oxidation with sulfuric acid normally.

What is the anodic oxidation of aluminum?

The anodic oxidation of aluminum is a process of electrolytic oxidation. In the process, the surface of the aluminum
and the aluminum alloy will be normally converted into a layer of oxidation film with functional performance of
protection, decoration and others. The anodic oxidation of aluminum starting from the definition only includes the
process of generating the anodic oxidation film.

Why does it need the anodic oxidation?

To overcome the defects of the surface hardness and wear resistance, enlarge the application scope and increase
the service life, surface treatment technology is to be a necessary step for the use of the aluminum alloy. And the
anodic oxidation technology is applied widest and most successful now.

Principles

Taking the work piece of the metal or alloy as the anode to form the oxidation film on the surface with the electrolytic
way. The metal oxidation film change the state and performance of the surface, like surface coloration, improving
the resistance to the corrosion, increasing the abrasive resistance and hardness as well as protecting the metal
surface. For example, the anodic oxidation of aluminum is to put the aluminum into the corresponding electrolyte
(such as sulfuric acid, chromic acid and oxalic acid) as the anode, under the effect of the specific conditions and
the impressed current for electrolysis. The aluminum or the alloy is oxidized at the anode. Aluminum oxide is formed
on the surface. The general thickness of the film for the interior decoration is 3~10μm and 15~25μm for the exterior
decoration. Hard anodizing film could reach the thickness of 40~200μm. The hardness and the abrasive resistance
of the aluminum or its alloy after the anodic oxidation have been increased, reaching 220~500 kg/mm2; good heat
resistance, the melting point of the hard anodizing film is as high as 2300K; good insulativity, the resistance of
breakdown voltage is as high as 2000V; increasing the corrosion resistance, no corrosion in the slat mist of
ω=0.03NaCl for thousand hours. A lot of micropores on the thin layer of the oxidation film could absorb various
lubricants, applicable to manufacture the engine cylinder or other wear parts. The film could be colorated various
beautiful and colorful colors with the strong adsorption capacity of the micropore. Nonferrous metal or its alloy
(such as aluminum, magnesium and their alloys) all could be treated with anodic oxidation. This method is widely
used in the mechanical part, parts of plane and automotive, precise instrument, radio equipment, daily necessities
and architecture decoration.

The function of anodic oxidation

Protection
Decoration
Insulativity
Improving the adhesion with the organic coating.
Improving the adhesion with the inorganic coating.
Other functions in the development

Process flow chart

Process flow chart





al-sheet
Our products have exported to Argentina, Australia, New Zealand, USA, Brazil, Chile, Fiji, Mexico, Germany, UK, Italy, Czech, Saudi Arabia, UAE, Iran, Iraq, Bangladesh, India, Sri Lanka, Viet Nam, Japan, Korea, Singapore, Indonesia, Philippines, South Africa etc more than 50 countries. Whenever you have a need for any of our products, please feel free to contact us .
Henan Mintai Al. Industrial Co., Ltd.
Professional aluminum plates/sheets/coils/foils/circles manufacturer in China
Factory Add: No.3 Weier RD, Industrial Zone, Gongyi City, Henan Province, P.R.CHINA.
Office Add: No.1043 Unit One Weilai International No.25 Buliding CBD Business Inner Ring Zhengdong New District ,Zhengzhou Henan Province, P.R.China.
Mob:+86 15838001176 (wechat/whatsapp)
TEL:+86-371-68085488
TEX:+86-371-69068199

EMAIL: 
sales@mintaialuminum.com
Website: 
www.mintaialuminum.com







Pre:decorative aluminum foil

Next:Back To List

Business Partners People's Cable Group Aluminum cabel