The impact of the environment can cause many types of degradations such as pitting corrosion, stress corrosion cracking and sulphide stress cracking of metal structures, and one of serious problems in the oil extracting industry is the corrosion process. Recently, a number of assets failures caused by internal corrosion is recorded in the oil and gas industry. Reports have confirmed that failures are due from the effect of HCl traces. Our objectives are to use the plant extracts, such as organic corrosion inhibitors. Indeed, these natural extracts contain many families of natural organic compounds – ‘green’, readily available and renewable. The mechanics tests carried out on a study of anti-corrosive properties of natural products - plant origin have so far given promising results of fracture mechanics properties. The importance in this area of research is mainly related to the fact that natural products can replace present toxic organic molecules, condemned by world directives as environmentally unacceptable.
Keywords: corrosion, green inhibitors, fracture mechanics, pipelines, steel API 5L X52.