Selected colors achievable through anodization of titanium. Anodized titanium is used in a recent generation of surgical implants. An anodized oxide layer has a thickness in the range of 30 nanometers Standards for titanium anodizing are given by AMS 2487 and AMS 2488. Anodizing titanium generates an array of different colors without dyes, thus it is sometimes used in art, costume jewelry, body piercing jewelry and wedding rings. The color formed is dependent on the thickness of the oxide is determined by the anodizing voltage. It is caused by the interference of light reflecting off the oxide surface with light traveling through it and reflecting off the underlying metal surface.
Niobium anodizes in a similar fashion to titanium with a range of attractive colors being formed by interference at different film thicknesses. Again the film thickness is dependent on the anodizing voltage. Uses include jewelry and commemorative coins.
Tantalum anodizes in a similar fashion to titanium and niobium with a range of attractive colors being formed by interference at different film thicknesses. Again the film thickness is dependent on the anodizing voltage and typically ranges from 18 to 23 Angstroms per volt depending on electrolyte and temperature. Uses include tantalum capacitors.
Anodizing Chemicals for Aluminum, Magnesium – ANODOXi - 10
Anodizing is an electrochemical process of growing conversion oxide coating as a result of oxidation of an anodically connected metal in an acidic electrolyte solution. Conversion coating is a film of a chemical compound formed in the reaction of the substrate substance with another substance. This reaction distinguishes conversion coating from a conventional coating applied on the substrate surface without changing its chemical state. The barrier-type oxide film forms in neutral electrolyte solutions in which aluminum oxide does not dissolve. The porous oxide film forms in acidic electrolyte solution, in which aluminum oxide not only grows but also dissolves. Clear anodizing is the anodizing process resulting in formation of translucent clear film. Whereas Hard anodizing is the anodizing process resulting in formation of high density coating with large cells and small pores. Clear anodizing provides good corrosion resistance and moderate wear resistance. Hard anodize coating is extremely durable and abrasion / wear resistant. Dying is a process of absorption of organic or inorganic molecules in the micro pores of an anodize coating. The dye occupies the microscopic pores and delivers the coating a color. The dyed coating is usually sealed in hot water. Dying provides excellent decorative appearance to the anodized part. Electrolytic coloring is two step process of Clear anodizing followed by AC deposition of a metal e.g. tin or nickel onto the bottom of the oxide pores. Electrolytic coating produces bronze color due to optical interference caused by the metal deposition. Electrolytic coating possess stable and durable color. Sealing : Sealing of an anodize oxide coating is performed in order to trap the dye locating in the pores and prevent absorption of undesired molecules in the pores. Sealing is conducted in hot water at a temperature about ( 93ºC ). We are manufacturer, supplier, exporter of anodizing chemicals, pre-anodizing chemicals also we are service provider, process designer and consultants in the field of anodising process.
Magnesium is anodized primarily as a primer for paint. A thin ( 5 μm ) film is sufficient for this. Thicker coatings of 25 μm and up can provide mild corrosion resistance when sealed with oil, wax, or sodium silicate. Standards for magnesium anodizing are given in AMS 2466, AMS 2478, AMS 2479, and ASTM B893.