Galvanic coating

The principal metal used in galvanizing coatings is zinc. In cooling water systems, use of galvanized panels and steel pipe is common. 

Zinc, aluminum, nickel alloys, cobalt alloys and tungsten carbide are applied for sprayed coatings, which are slightly porous. Flame-sprayed zinc coatings are used for corrosion protection of steel and provide similar properties for galvanized coatings. 

BS729 Hot Dip Galvanized Coatings on Iron and Steel Articles. ... 

ASTM A123 Zinc (Hot Galvanized) Coatings on Products Fabricated from Rolled, Pressed and Forged Steel Shapes, Plates, Bars and Strips. ... 

Mackowiak, J., and Short, N. R., Metallurgy of Galvanized Coatings , nt. Metals. Reviews, No 1 (reprinted by Galvanizers Association, London) (1979)... 

A final method is metallisation11 of fibres, which is most related to the technology described in this chapter. In this method, metal salts are taken up by the fibre and reduced to their metallic conductive form. Metallisation can be achieved in different ways. A first way is by a vacuum metal spray. However, this results in very poor defined metallisation. In addition, galvanic coating is used in the production of conductive fibres, but this type of coating requires a fibre that is already conductive. 

Cathodic protection, provided that the material is not susceptible to embrittlement. Sacrificial zinc (galvanized) coatings. 

Galvanization, coating the metal with an unbroken layer of zinc. Zinc is preferentially oxidized and the zinc oxide that forms provides a protective coating (passivation). 

The passive film of galvanized rebars is stable even in mildly acidic environment, so that the zinc coating remains passive even when the concrete is carbonated. The corrosion rate of galvanized steel in carbonated concrete is approximately 0.5-0.8 pm/y, therefore a typical 80 pm galvanized coating would be expected to last over 100 y. [44]. The corrosion rate of galvanized bars remains negligible in carbonated concrete even if a low content of chloride is present. 

Thermal-sprayed galvanic coatings offer excellent corrosion and wear protection [73—75] and have been used in various industrial applications [76]. For the purpose of... 

N. Boshkov, K. Petrov, D. Kovacheva, S. Vitkova, S. Nemska, Influence of the alloying component on the protective abihty of some zinc galvanic coatings, Electrochim. Acta 51 (2005) 77—84. 

N. Boshkov, K. Petrov, G. Raichevski, Corrosion behavior and protective ability of multilayer galvanic coatings of Zn and Zn-Mg alloys in sulfate-containing medium. Surf. Coat. Techol. 200 (2006) 5995-6001. 

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