2.4. Determination of self-corrosion rate
Weight-loss measurements were performed as described
in an earlier publication [4]. Triplicate test specimens, suspended
from the hooks of a glass rod, were introduced into a
beaker that contained 200 ml of the test solution either with
or without the inhibitor and complexing agents. The weightloss
experiment was carried out for 20 and 100 h for each
system in different electrolytic solutions. All tests were conducted
at room temperature (30 + 1 °C). At the end of each
run, the specimens were removed, washed thoroughly with
running water, rinsed with distilled water, and dried. The
specimens were immersed in 20% sulfur-free chromic acid
solution [5] at 80 °C for 5 min, withdrawn, washed thoroughly
with tap water, rinsed with distilled water, dried and
weighed. All corrosion rates were calculated in terms of mg/
(cm 2 min) after applying a blank weight-loss correction.