In order to prevent and reduce to minimum the iron dissolution from the steel strip, allowing a preferential
attack on the scale, in all the baths organic compounds, namely corrosion inhibitors, are added. The goal of the
inhibitors addition is to protect the strip from the attack by the hydrochloric acid solution, by means of
protective film that sticks on the surface of the steel strip but not on the oxide. It is fundamental to set the
optimum concentration of the corrosion inhibitor, because a suitable trade-off must be reached between its
concentration, cost and the need to limit the amount of these hazardous components into the wastewater coming
from this process, in order to minimise the process impact on the surrounding environment