Electrogalvanic processes

Electrogalvanizing Electrography Electrogravimetry Electrohydrodynamics Electro-Katadyn process Electrokinetics Electroless deposition Electroless nickel Electroless plating... 

The primary environmental concern for the coating plant is actually the residual material on the anode stmctures being returned for recoating. Therefore the anode user must enact effective cleaning procedures prior to shipment. For example, anodes in chlorine use must be cleaned of all traces of mercury and asbestos (qv). Anodes used in electrogalvanizing or in copper-foil production must similarly be cleaned to remove all traces of process materials. If cleaning at the user s plant is not done effectively, the anode may well be shipped back to the user for appropriate action before it is considered for recoating. 

In electrogalvanizing, copper foil, and other oxygen-evolving appHcations, the greatest environmental contribution has been the elimination of lead-contaminated waste streams through replacement of the lead anode. In addition, the dimensionally stable characteristic of the metal anode iatroduces greater consistency and simplification of the process, thus creating a measure of predictabiUty, and a resultant iacreased level of safety. 

Electrogalvanizing can be done essentially at room temperature, thus the process does not alter the mechanical properties that could result from the higher lemperalures encountered in dipping. 

Chemical process plants often use epoxy, acrylic, polyurethane, and other coatings to prevent corrosion.107 Food cans often have epoxy resin linings. A coating made by the plasma polymerization of a 1 1 perfluorobutane-hy-drogen mixture protected copper from aqueous corrosion.108 Auto makers often use electrogalvanized steel... 

Chem. Descrip. French process zinc oxide from recycled zinc metal CAS 1314-13-2 EINECS/ELINCS 215-222-5 Uses Pigment, filler for rubber, zinc chems., oil additive, tape/adhesives, paint, glass, wire insulation, agric., electrogalvanizing, and brake lining industries... 

The differential equation of Laplace (V c = 0) describes the formation of fractal distribution of solid matter that results from very different processes (Figure 7.5). Diffusion-limited aggregation (c is the concentration), electrogalvanic deposition (c is the electric potential), and viscous invasion (c is the local pressure) are three Laplacian processes that produce similar fractal distributions. They all imply a strong positive feedback and have the same mathematics. The first two are of significance for materials synthesis. 

Coatings of zinc, whether hot-dipped or electroplated, are called galvanized coatings, and the term electrogalvanized is used to differentiate electroplated from hot-dipped coatings. The electroplating process has been used to explore new zinc alloy coatings, such as Zn-Fe, Zn-Co, and Zn-Ni [17],... 

S. Kotowski and B. Busse. Titanium Anodes for Steel Strip Electrogalvanizing, In F. Mine, B.V. Tilak, J.M. Denton, J.D. Lisius (eds). Performances of Electrodes for Industrial Electrochemical Processes, The Electrochemical Society Inc., Pennington, NJ, 245 (1989). 

This process is sometimes mistakenly referred to as electrogalvanizing. In this process zinc salt solutions are used in the electrolytic deposition of a layer of zinc on a cleaned steel surface. 

It was previously mentioned that the term electrogalvanizing is sometimes used to describe this process. This is misleading since the chief characteristic of galvanizing is the formation of a metallurgical bond at the zinc-iron interface. This does not occur in electroplating. 

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