Other Coating Methods

Electrophoretic and similar compacted coatings are in early stages of development but will no doubt take their place alongside other coating methods. 

AppUcation of PVD coatings to coils of steel sheet in a continuous process was studied extensively in the United States during the 1970s, but the process was found to be more costly relative to other coating methods, such as electroplating and hot dipping. More recently, efforts are underway in Japan and Europe to further develop such a process. 

While the previous picture has largely been worked out for silane coatings produced from aqueous solution, it seems that it probably applies, in very general terms at least, to other coating methods. The relative proportion of physisorbed and chemisorbed material and their detailed structure will however probably vary markedly. Among the important factors will be the concentration of suitable surface hydroxyls, the surface pH and the amount of water present. 

There are a variety of other coating methods. Three of these are the electron beam (E beam) technique. Penning sputtering and saddle field ion beam sputtering. The methods require more... 

These materials are available by screen printing, spray coating, and other coating methods. UL-certified grades are available for conunercial use. The flexibility of the materials allows several cycles of bending however, the materials are not available for the long-term flexing that applications such as hard disk drives and printers require. 

Other Coating Methods investigates some less common film-forming processes including electrophoresis, thermophoresis, and settling, as well as hybrid methods combining several processes. 

The entire slurry flow path is sealed against the environment until the slurry reaches the aluminum foil. Wear in a slot-die system is also very low in comparison to most other coating methods. This further reduces contamination of a coated product. 

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