Sulfuric acid is used in many indus

Sulfuric acid is used in many industrial applications, for example pickling and chemical cleaning of steel. Unluckily, the acidic solution caused the corrosion damage. The addition of the inhibitors is one of the effective methods used to protect the steel from the corrosive acid attack. Most of the inhibitors used are inorganic or organic com- pounds containing heteroatoms (1–16). These compounds are more efficient for the protection of steel from corrosion damage by its adsorption on the steel surface. Unfortu- nately, most of the synthetic compounds are toxic and cause damage to public health and the environment. There- fore, most researchers now tend to use some natural extracts for some plants to inhibit the corrosion attack of some metals and alloys in aqueous solutions (17–26).