Anodizing
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 These inexpensive decorative carabiners have an anodized aluminium surface that has been dyed; they are made in many colors. |
Anodizing is an electrolytic passivation process used to increase the thickness of the natural oxide layer on the surface of metal parts. The process is called "anodizing" because the part to be treated forms the anode electrode of an electrical circuit. Anodizing increases corrosion resistance and wear resistance, and provides better adhesion for paint primers and glues than does bare metal. Anodic films can also be used for a number of cosmetic effects, either with thick porous coatings that can absorb dyes or with thin transparent coatings that add interference effects to reflected light. Anodizing is also used to prevent galling of threaded components and to make dielectric films for electrolytic capacitors. Anodic films are most commonly applied to protect aluminium alloys, although processes also exist for titanium, zinc, magnesium, niobium, zirconium, hafnium, and tantalum. Iron or carbon steel metal exfoliates when oxidized under neutral or alkaline microelectrolytic conditions; i.e., the iron oxide (actually "ferric hydroxide" or hydrated iron oxide, also known as rust) forms by anoxic anodic pits and large cathodic surface, these pits concentrate anions such as sulfate and chloride accelerating the underlying metal to corrosion. Carbon flakes or nodules in iron or steel with high carbon content (high carbon steel, cast iron) may cause an electrolytic potential and interfere with coating or plating. Ferrous metals are commonly anodized electrolytically in nitric acid, or by treatment with red fuming nitric acid, to form hard black ferric oxide. This oxide remains conformal even when plated on wire and the wire is bent.
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| Hard anodizing – A selection of suitable aluminum ... Hard anodizing – A selection of suitable aluminum alloys www.gwp-ag.com/.../1563_hard-anodizing-alloys.pdf - Web |
| The Aluminum Anodizers Council The Aluminum Anodizers Council www.anodizing.org - Web |
| Article on anodizing and dyeing from Coating and F... Article on anodizing and dyeing from Coating and Fabrications Magazine www.coatfab.com/anodising.htm - Web |
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| Encyclopedia Article Encyclopedia Article electrochem.cwru.edu/encycl/art-a02-anodizing.htm - Web |
| Website with useful anodizing information in Layma... Website with useful anodizing information in Layman's Terms bryanpryor.com/anodizing.php - Web |
| Titanium in Technicolor Titanium in Technicolor www.popsci.com/.../3f178ca927d05010vgnvcm1000004eecbccdrcrd.html - Web |
