Author/Authors :
Panossian، نويسنده , , Z. and Mariaca، نويسنده , , L. and Morcillo، نويسنده , , M. and Flores، نويسنده , , S. and Rocha، نويسنده , , J. and Peٌa، نويسنده , , J.J. Ku-Herrera، نويسنده , , F. and Corvo، نويسنده , , F. and Sanchez، نويسنده , , Juan M. Torres-Rincon، نويسنده , , O.T. and Pridybailo، نويسنده , , G. and Simancas، نويسنده , , J.، نويسنده ,
Abstract :
Zinc has traditionally been the metallic material most widely used to protect steel against atmospheric corrosion due to its ability to afford cathodic protection to steel in all types of natural atmospheres. In recent decades, aluminium and zinc/aluminium alloy coatings have been used instead of zinc in certain atmospheric applications. Although these coatings present some advantages over zinc, they are not able to cathodically protect steel substrates in all types of natural atmospheres. The present paper assesses the cathodic protection afforded by Al (flame spraying), Al/13 Si (hot dipping), 55Al/Zn (hot dipping), Zn/15Al (flame spraying), Zn/5Al (hot dipping), Zn (hot dipping), Zn (discontinuous hot dipping) and Zn (electroplating). Aluminium and aluminium-rich alloy coatings (55%Al/Zn) provide cathodic protection to the steel substrate only in atmospheres that are highly contaminated with chloride ions (>100 mg Cl− m−2 day−1) where these coatings become active.
Keywords :
Zinc/aluminium alloy coatings , CATHODIC PROTECTION , Coated steel , Atmospheric Corrosion , ZINC COATINGS , Aluminium coatings
