CONDUCTANCE MEASUREMENTS IN CORROSION AND INHIBITION OF AL AND AL-MN ALLOY

Studies were performed to determine the effect of 2-picoline, 3-picoli ne, 4-pyridinol, and 2-pyridinamine on the dissolution of untreated, a nodized, and sealed aluminum and aluminum-manganese alloys at 30.0 and 40.0-degrees-C. Conductance measurements were applied to evaluate the corrosion rate. A comparison was carried out between this newly sugge sted conductance method and other methods previously used to estimate the dissolution rate. This comparison shows of the reliability of this conductance method. A good correlation was observed between the basic ity, structure, and the inhibition effect of all compounds investigate d. The order of inhibition efficiency is increasing as: 2-pyridinamine >4-pyridinol>3-picoline>2-picoline. This order described above is cons istent with the evidence that the oxidized specimens show higher inhib ition in the presence of additives than sealed and untreated ones.