Abstract
Studies were performed to determine the effect of 2-picoline, 3-picoline, 4-pyridinol, and 2-pyridinamine on the dissolution of untreated, anodized, and sealed aluminum and aluminum–manganese alloys at 30.0 and 40.0 °C. Conductance measurements were applied to evaluate the corrosion rate. A comparison was carried out between this newly suggested 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 basicity, structure, and the inhibition effect of all compounds investigated. The order of inhibition efficiency is increasing as: 2–pyridinamine > 4–pyridinol > 3–picoline > 2–picoline. This order described above is consistent with the evidence that the oxidized specimens show higher inhibition in the presence of additives than sealed and untreated ones.