Comparative corrosion behaviour of Zn-2l Al-2Cu alloy and galvanized steel

A comparative study of the atmospheric corrosion of Zn-21wt%25 Al-2wt%25 Cu (Zn-21Al-2Cu) alloy, galvanized steel (zinc), and aluminium, was performed exposing them to an urban atmosphere for up to five years. The corrosion rate, determined by weight loss, was greater for the ternary alloy than that for galvanized steel, and very superior to that exhibited by aluminium. Electrochemical tests showed that the longer the exposure time, the greater the protection by the corrosion products. The characterization and morphology of the corrosion products were carried out using scanning-electron microscopy, and X-ray diffraction.

Corrosion prevention; Galvanizing; Scanning electron microscopy; Ternary systems; X ray diffraction analysis; Ternary alloys; Zinc alloys; atmospheric corrosion; corrosion; electrochemical analysis; galvanic corrosion; steel; testing method; zinc alloy

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