Chihi, S.Gherraf, N.Alabed, B.Hameurlain, S.2020-09-272020-09-272009-07-01Articale in Journal of fundamental and Applied Sciences Vol. 01 N. 021112-9867http://dspace.univ-eloued.dz/handle/123456789/7078Articale in Journal of fundamental and Applied Sciences Vol. 01 N. 02The influence of flavonoids extracts of three parts of Euphorbia Guyoniana towards the corrosion of type API 5L X52 steel in 15% H2SO4 has been evaluated by weight loss method and polarization technique. The results showed that extracts are a good inhibitors for API 5L X52 steel in this medium. The corrosion inhibition efficiency increases on increasing plant extracts concentration. The inhibition is attributed to the adsorption of the surface of the metal. Potentiodynamic polarization results revealed that the studied inhibitors behave as a mixed type.enAPI 5L X52 steel, corrosion inhibition, sulphuric acid, Euphorbia Guyoniana, flavonoids extractArticle