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00459 CHARACTERIZATION OF THE ATMOSPHERIC CORROSION PRODUCTS FORMED ON MODIFIED Zn-Al EUTECTOID ALLOY

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Product Number: 51300-00459-SG
ISBN: 00459 2000 CP
Author: L.S. Hernandez, J.M. Miranda, O. Dominguez
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The atmospheric corrosion of the Zn-2 lwt%AI-2wt%Cu (Zn-21AI-2Cu) alloy exposed to an urban atmosphere was investigated after different outdoor exposition periods. The corrosion rate, determined by weight loss, was slightly higher for the ternary alloy than that for zinc and very superior to the one measured with aluminum. The results of the electrochemical methods used, such as corrosion potential, polarization resistance (Rp), potentiostatic and potentiodynamic polarizations, demonstrated a greater corrosion resistance of the surveyed materials as a consequence of the presence of corrosion product layers on the metallic surface, This greater corrosion resistance increased with the outdoor exposure time. However, in a direct comparison between both types of methods, the Rp values showed results that are contrary to those obtained by weight loss. Through scanning electron an exfoliation or layer corrosion was detected in the ternary alloy, which had not been reported up to now in these alloys with relatively low aluminum contents. By means of x-rays diffraction the compounds present in the corrosion products for the ternary alloy (essentially water-soluble sulfates) could be identified whether those present on zinc and aluminum could not.

KEY WORDS: ahiminmn, atmospheric corrosion, corrosion products, galvanized steel, polarization resislance, scanning electron microscopy, sulfi~r dioxide, urban environment, x-ray diffraction, zinc-aluminum-copper alloys
The atmospheric corrosion of the Zn-2 lwt%AI-2wt%Cu (Zn-21AI-2Cu) alloy exposed to an urban atmosphere was investigated after different outdoor exposition periods. The corrosion rate, determined by weight loss, was slightly higher for the ternary alloy than that for zinc and very superior to the one measured with aluminum. The results of the electrochemical methods used, such as corrosion potential, polarization resistance (Rp), potentiostatic and potentiodynamic polarizations, demonstrated a greater corrosion resistance of the surveyed materials as a consequence of the presence of corrosion product layers on the metallic surface, This greater corrosion resistance increased with the outdoor exposure time. However, in a direct comparison between both types of methods, the Rp values showed results that are contrary to those obtained by weight loss. Through scanning electron an exfoliation or layer corrosion was detected in the ternary alloy, which had not been reported up to now in these alloys with relatively low aluminum contents. By means of x-rays diffraction the compounds present in the corrosion products for the ternary alloy (essentially water-soluble sulfates) could be identified whether those present on zinc and aluminum could not.

KEY WORDS: ahiminmn, atmospheric corrosion, corrosion products, galvanized steel, polarization resislance, scanning electron microscopy, sulfi~r dioxide, urban environment, x-ray diffraction, zinc-aluminum-copper alloys
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