The inhibitor
concentration was chosen taking into account the solubility limit of the compound in aqueous media. After the corrosion tests
the specimens were removed, carefully washed, first with a solution
composed by NaOH (30% w/w) and zinc powder (200 g/L),
then with bidistilled water, and finally rinsed with acetone, placed
in a desiccator for 30 min and then weighed. The rinse removes
loose segments of the film on the corroded samples. The weight
loss was measured by means of an analytical balance.