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Type 1 photosensitive anodized aluminum is certified to several military and federal specifications: MIL-A-8625F, Amendment 1, for photosensitized nameplates (Ref. Section 3.4.2.2) DMS-1674G, Class 1 Types 1,2 and 3 and Class 2; MIL-DTL-15024F Type G and Type H (.012 and thicker) MIL-DTL-19834C (.003", foil)
Coatings of moderate thickness 1.8 μm to 25 μm (0.00007" to 0.001") [16] are known as Type II in North America, as named by MIL-A-8625, while coatings thicker than 25 μm (0.001") are known as Type III, hard-coat, hard anodizing, or engineered anodizing. Very thin coatings similar to those produced by chromic anodizing are known as Type IIB.
According to Russian literature after processing items should be soaked in a solution of potassium bichromate (5-10%), 5–15 minutes, 70-90 °C temperature of the solution. [36] According to one Chinese patent, treated objects can be then immersed in a hot diluted sodium silicate solution (1-5%,95-100 C,3-10 min.). [ 37 ]
The porous nature of anodic alumina films was discovered in the 1930s [1] and further elaborated in the 1950s–1970s. [ 2 ] [ 3 ] Processes for producing anodic aluminum oxide membranes using chromic acid, sulfuric acid , oxalic acid, or phosphoric acid appear in a patent attributed to Alan W. Smith of the Boeing Company in 1974.
Education literature and resources. Provides access to over 1.3 million records dating back to 1966. Free Produced by the United States Department of Education. [55] Also available by subscription from OCLC, CSA. Europe PMC: Biomedical: A database of biomedical and life sciences literature with access to full-text research articles and ...
Anodizing [ edit ] For AA 5083 alloy, the stages of porous structure development are substantially identical with that of pure aluminium, although an increase in oxide growth rate and high conductance of the oxide film were observed.
The Online Books Page is an index of e-text books available on the Internet. [1] It is edited by John Mark Ockerbloom and is hosted by the library of the University of Pennsylvania . [ 2 ] The Online Books Page lists over 2 million books [ 3 ] and has several features, such as A Celebration of Women Writers and Banned Books Online .
3 Fe(CN) 6, 5-10% potassium hexafluorozirconate K 2 ZrF 6, and 5-10% sodium fluoride NaF by weight. The formula was meant to be dissolved in water at the concentration of 9.0 g/L, giving a bath with pH = 1.5. It yielded a light gold color after 1 min, and a golden-brown film after 3 min. The average thickness ranged between 200 and 1000 nm. [6]