where W is the average weight loss of three parallel carbon steel sheets (one specimen in each beaker), S is the total area of the steel specimen, and t is immersion time, CR(uninh) and CR(inh) are the corrosion rates obtained in absence and presence of inhibitors, respectively [23]. The specimens were immersed in the solutions without blocking any side, and the whole specimen area was considered in the calculation. Experiments were carried out in triplicate. The average weight loss of three parallel CS sheets was obtained.