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What is the anode oxidation
Jun 14, 2018

Anodic oxidation (anodic oxidation):


The electrochemical oxidation of metal or alloy. Aluminum and its alloy in the corresponding electrolyte and special technology condition, because of the effects of the impressed current, in the aluminum products (anode) on a layer of oxide film formation process. Anodic oxidation and if not specified, usually refers to the sulfuric acid anodizing.


In order to overcome the shortcomings of aluminum alloy surface hardness, wear resistance and so on, expand the scope of application, prolong the service life, surface treatment technology has become an indispensable part in the use of aluminum alloy, and the anode oxidation technology is currently the most widely used and the most successful.


 Anodic oxidation of the aluminum is a kind of electrolytic oxidation process, in this process, the surface of aluminum and aluminum alloys are usually converted to a layer of oxide film, this film has a protective, decorative and other functional characteristics. Anodic oxidation from the definition of aluminum, includes only the generation of this part of the process of anodic oxide film.

将金属或合金的制件作为阳样,采用电镀的方法使其表面形成氧化物薄膜。金属氧化物薄膜改变了表面状态和性能,如表面着色,提高耐腐蚀性、增强耐磨性及硬度,保护金属表面等。例如铝阳极氧化,将铝及其合金置于相应电解液(如硫酸等)中作为阳极,在特定条件和外加电流作用下,进行电解。阳极的铝或其合金氧化 ,表面上形成氧化铝薄层 ,其厚度为5~30微米 ,硬质阳极氧化膜可达25~150微米 。阳极氧化后的铝或其合金,提高了其硬度和耐磨性,可达250~500千克/平方毫米,良好的耐热性 ,硬质阳极氧化膜熔点高达2320K ,优良的绝缘性 ,耐击穿电压高达2000V ,增强了抗腐蚀性能 ,在ω=0.03NaCl盐雾中经几千小时不腐蚀。氧化膜薄层中具有大量的微孔,可吸附各种润滑剂,适合制造发动机气缸或其他耐磨零件;膜微孔吸附能力强可着色成各种美观艳丽的色彩。有色金属或其合金(如铝、镁及其合金等)都可进行阳极氧化处理,这种方法广泛用于机械零件,飞机汽车部件,精密仪器及无线电器材,日用品和建筑装饰等方面。

Metal or alloy parts as the positive samples, using electroplating method to make the surface oxide film. Metal oxide film changed the surface state and properties, such as surface coloring, improve corrosion resistance, enhanced wear resistance and hardness, protection of metal surface. For example, anodized aluminum, aluminum and its alloy is arranged in the corresponding the electrolyte (such as sulfuric acid) as anode, in particular conditions and external current, electrolysis. Anode aluminum or its alloy oxidation, the formation of alumina layer on the surface, the thickness is 5 to 30 microns, hard anodic oxidation film can reach 25 ~ 150 micron. Anodized aluminium and its alloy, improve the hardness and wear resistance, up to 250 ~ 500 kg / mm2, good heat resistance, high melting point of 2320K hard anodic oxidation film, good insulating property, high breakdown voltage up to 2000V, enhanced the corrosion resistance, salt fog in Omega =0.03NaCl after thousands of hours of no corrosion. Has a large number of porous oxide film layer, can absorb all kinds of lubricants, suitable for the manufacture of engine cylinder or other wear parts; microporous membrane adsorption ability can be colored in various beautiful bright colors. Nonferrous metal or its alloy (such as aluminum, magnesium and its alloy) can be anodized, this method is widely used in machinery parts, aircraft, automobile parts, precision instruments and radio equipment, daily necessities and building decoration etc..


Generally speaking, the anode are made of aluminum or aluminum alloy as anode, cathode is selected to lead, aluminum and lead them in aqueous sulfuric acid, oxalic acid, there, chromic acid, electrolysis, let the surface of aluminum and lead to form an oxide film. In these acid, is the most widely used sulfuric acid anodic oxidation of.

作用:防护性 装饰性 绝缘性 提高与有机涂层的结合力 提高与无机覆盖层的结合力 开发中的其它功能

Effect: in combination with other functions in the development of improved adhesion force and inorganic coating protective decorative insulation increased with organic coating