Findings
Inhibitor properties and mechanism
Q235A (A3) steel is widely used in the gas and oil field,
and it is easily eroded in the presence of high concentration
of HCl under high temperature. The use of corrosion
inhibitors, such as imidazoline, Mannich base,
Schiff base and some other heterocyclic compounds, is
considered as the most effective method for the protection
against such acid attack, but the concentration and
the cost is too high to be accepted.