EFFECT OF DUNALIELLA SALINA ON THE CORROSION BEHAVIOR OF TECHENICAL TITANIUM IN SALINE SOLUTIONS

摘要

The corrosion behavior of 99.6 % titanium in aqueous high concentrated salt solutions containing 1.0×105 cell /ml, 35 g of Na2SO4 , 35 g MgSO4 and 130 g of NaCl per liter of solution (pH 7.9) was investigated at 25 °C using standard analytical, biological and electrochemical techniques. It has been found that the algae Dunaliella salina inhibits the corrosion process of the tested sample as inferred from the decrease of corrosion current with increase of the number of cells in solution. The mechanism of inhibition seems to be preferential adsorption on the cathodic sites of the surface oxide film. The active component (the adsorbate ) seems to be P-carotene; as it is being easily released from the cell by the external tension ( the electrode surface ). Further passivation of the surface by the oxygen gas released from the biological activity of the system , metabolism of Dunaliella salina could not excluded.