Aluminium anodizing
Anodizing (= anodising) is kind of electrolytic passivation mostly used for Aluminium and other suitable metals (Mg, Ti, Nb, Wo, Zn) that increases the thickness of natural oxide layer on their surface (Al - 2-3 nm). According to the electrochemical polishing (electropolishing) the anodized parts immersed in the electrolyte form an anode (+) in electric circuit. However unlike that process there is no slowly surface dissolving by Aluminium but creation of oxide layer instead. Due to the acid solution the process is kept in, there is an antinomical process run by the same time - slow dissolving of oxide layer. But that is no competitive considerably at all and on the other hand it is required for smoothly pore creation on the metal surface (Ø 10 - 150 nm). That allows achieving a formation of uniform and compact oxide which is harder and more chemically resistant than a pure metal. The final micro-foam structure increases adhesion, lubricant acceptation and dye absorption which is utilized for following colouring with usage of wide hue palette. Anodizing is also a process widely used for creating dielectric film on the metal surface e.g. in production of electrolytic capacitors.
Layer properties
- Decorative, presentable coating able to be dyed subsequently with usage of wide scale industrial dyes (black, blue, red, gold, green, violet etc.)
- Chemical lasting, hard coating with wear resistance.
- High corrosion resistance after the pore enclosure.
- Electric resistance - production of dielectric application.
- Higher ability of lubricant and paint absorption.
Deposition - dimension
- 5 - 20 μm (according to the customer demands)
Way of processing
- Rack
Basic material - substrate
- Aluminium and its alloys
Application field
- Automotive industry - decorative treatment of functional parts, inner treatment for engine cylinders (BMW)
- Electronics - casing of appliances, audio-video players (DVD, mp3 etc.), photographic cameras, camcorders, chip and microprocessor coolers.
- Optoelectronics a laboratory equipment - microscopes, spectrophotometers etc.
- Aircraft industry - constructional parts
- Sport equipment - bike parts, tennis raquets etc.