Aluminum coatings vapor

J.C. Withers and L.C. Mccandless, Aluminum Coatings by a Pyrolytic Spray Chemical Vapor Deposition Processing, Chemical Vapor Deposition, 1970, pp.393-407. 

Sample details for MISSE-6, combined VUV and AO exposure are two MSI PVDF bimorphs and two Ktech TrFE copolymer bimorphs, again with electrodes on either side. Passive sample are also two PVDF and two Ktech TrFE films with different aluminum coatings. All coatings were made using vapor deposition. 

Figure 32.2 A SEM picture of IVD aluminum coating on 7075-T6 A1 substrate. Table 32.1 Comparison of Ion Vapor Deposition and DC Cathodic Pol5unerization Processes ...

Hemispherical absorptance of water vapor and carbon dioxide deposits at 77 K for 290 K radiation as a function of deposit thickness. Plain aluminum and aluminum coated with a black epoxy paint were used as the substrates. 

Normal absorptance of water vapor deposits at 77°K for radiation from a mercury-xenon source (with and without a filter) as a function of deposit thickness. Aluminum coated with a black epoxy was used as the substrate. 

Although aluminum coatings can be obtained by deposition from vapor sources (e.g., aluminum chloride, organoaluminum compounds, or physical vapor deposition), the use of such techniques has only recently been exploited commercially to any large extent. 

Certain proprietary zinc and aluminum filled polymers and some ion vapor deposited aluminum coatings, applied to steel fasteners may actually produce more damage than the untreated steel fastener itself. This was attributed to two possible causes either the high surface area involved with each of the particulate coatings or the contamination of the particulate surface with active cathodic contaminants such as iron, nickel, or graphite ... 

Metal Foils. Most common is aluminum, less common are copper and lead. Snch tapes are quite conformable and are used to seal against moisture and water. Tapes with aluminum foils or aluminum-coated films can shield surfaces against thermal radiation. Copper and aluminum foils and vapor-coated films also can be used to shield against electromagnetic interference. 

Yang et al. first synthesized boron nanorods in 2007. A chemical vapor deposition technique was demonstrated on the formation of boron nanorods structures. An aluminum-coated silicon substrate was placed in a tube furnace and kept at a temperature of 700-950°C. A mixture of argon,... 

Aluminum coatings can be applied to steel by hot dipping, cementation, ion vapor deposition, and spraying. Ion vapor deposition is a relatively new process, and spraying is the only process that has been used extensively over a long period of time. Pack cementation is widely used for gas turbine components. In soft waters aluminum is cathodic with respect to steel however, in seawater or some fresh waters containing chloride ions or sulfate ions, aluminum may become anodic to steel, and aluminum coatings should therefore corrode sacrificially and provide cathodic protection to steel. However, as noted below, this may not always be the case. 

Ion vapor deposition of aluminum is attractive because it avoids the environmental and toxicological problems associated with cadmium. It does not cause hydrogen embrittlement of steel or solid metal embrittlement of steel or titanium, and it should be more galvanically compatible with aluminum alloy structure and avoid the exfoliation corrosion of sensitive alumimun alloy structme. However, views on the ability of alumimun to protect steel fasteners appear to vary. A view is that the presently available pure aluminum coatings are not able to provide adequate sacrificial protection to steel in a chloride ion environment, and for this reason a recommendation is made for the development of alruninrun coatings containing small amounts of zinc or other elements for improved protection. 

Polyester. Poly(ethylene terephthalate) [25038-59-9] (PET) polyester film has intermediate gas- and water- vapor barrier properties, very high tensile and impact strengths, and high temperature resistance (see Polyesters, thermoplastic). AppHcations include use as an outer web in laminations to protect aluminum foil. It is coated with PVDC to function as the flat or sealing web for vacuum/gas flush packaged processed meat, cheese, or fresh pasta. 

Another important function of metallic coatings is to provide wear resistance. Hard chromium, electroless nickel, composites of nickel and diamond, or diffusion or vapor-phase deposits of sUicon carbide [409-21-2], SiC , SiC tungsten carbide [56780-56-4], WC and boron carbide [12069-32-8], B4C, are examples. Chemical resistance at high temperatures is provided by aUoys of aluminum and platinum [7440-06-4] or other precious metals (10—14). 

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