The behavior of copper (electrolytic annealed, 99.8% pure) and zinc (98% pure) samples in continually aerated synthetic sea water (5 ml/minute of dry air containing 0.1% of CO2) and stirred (magnetic bar stirrer, at 200 rpm) at 24, 40, and 60 C, was studied. The corrodibility of the metals decreases with increasing temperature. The amounts of calcium and magnesium carbonates in the corrosion products increase with increasing temperature. The compounds formed by zinc and copper which adhere to the metallic surface are: Cu2O - CuO - CuCO3 · Cu(OH)2 - Cu2(OH)3 · Cl - ZnO - ZnCl2 · 4Zn(OH)2 - Zn4(CO3) (OH)6 · H2O - ZnSO4 · 3Zn(OH)2 · 4H2O. The corrosion products were examined both by diffractometric X-ray, and chemical analysis, using a series of solutions (methanol, glycine-saturated solution at 25 C, 10% ammonium chloride) capable of selectively dissolving the different components of the compounds, leaving the metallic matrix unaltered.

Subject
Chemical compounds, Water, Ions, Free corrosion potential, Corrosion products, Zinc oxide, Film formation, Metals, Weight loss, Immersion, Copper, Zinc, Electrode potential
© 1975 National Association of Corrosion Engineers
1975
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