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The basic principle of anodic oxidation

  • Author:Nancy
  • Source:www.diecastingpartsupplier.com
  • Release on:2014-11-24
The metal or alloy parts as anode, using electrolytic method to make the surface oxide film.Metal oxide film has changed the surface state and performance, such as surface shading, improve the corrosion resistance and enhance the wear resistance and hardness, protect the metal surface and so on.Aluminum anodic oxidation, for example, put the aluminum and its alloys in corresponding electrolyte (such as sulfuric acid, chromic acid, oxalic acid, etc.) as the anode, under certain conditions and impressed current, electrolytic.Anode aluminum or its alloy oxide, alumina thin layer is formed on the surface, the thickness is 5 ~ 20 microns, hard anodic oxidation film can reach 60 to 200 microns.After anodic oxidation of aluminum or its alloy and improve its hardness and wear resistance, can reach 250 ~ 500 kg per square millimeter, good heat resistance, hard anodic oxidation film melting point as high as 2320 k, excellent insulation, resistance to breakdown voltage of 2000 v, to enhance the corrosion resistance, hitches in omega = 0.03 NaCl salt fog corrosion thousands of hours.Oxide film in the thin layer with a large number of pores, can adsorption various lubricants, suitable for manufacturing engine cylinder or other wear parts;Membrane pores adsorption ability can be colored into various beautiful and bright colors.Non-ferrous metal or its alloy (such as aluminum, magnesium and its alloys, etc.) can be anodic oxidation treatment, this method is widely used in mechanical parts, aircraft parts, precision instruments and radio equipment, household goods and building decoration, etc.