Electrogalvanizing

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. 

Lain, E. S. Electrogalvanic Lesions of the Oral Cavity Produced by Metallic Dentures , Journal of the American Medical Association, 100, 717-720 (1933)... 

Banoezy, J., Roed-Petersen, B. Pindborg, J. J. and Inovay, J. Clinical and Histologic Studies on Electrogalvanically Induced Oral White Lesions Oral Surgery, Oral Medicine and Ora Pathology, 48, 319-323 (1979)... 

Zinc oxide is used as a raw material for many products stearates, phosphates, chromates, bromates, organic dithiophosphates, and ferrites (ZnO, MnO, Fe203). It is used as a source of zinc in animal feeds and in electrogalvanization. It is also used for desulfurizing gases. 

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. 

FIGURE 14.7 Illustration of dielectric heating for the bonding of an electrogalvanized steel (EGS)/ SMC lap shear joint.30... 

Figure 52 Normal current density distribution over a scribed electrogalvanized steel sample in 0.01 M NaCl as a function of time (a) 15 min, (b) 1 h, (c) 2 h. (From H. S. Isaacs, A. J. Aldykewicz, D. Thierry, T. C. Simpson. Corrosion 52, 163 (1996).)...

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