Synthèse Et Caractérisation De Nouveaux Composés Organiquescontenant Du Phosphore; Etudes De Leur Effet Inhibiteur Sur La Corrosion

Résumé: Steel and its alloys have many industrial applications, especially in the chemical, thermal, nuclear and, recently, in the petroleum industry. As a result, the study of corrosion and the inhibition of corrosion of this metal is a very important subject. This work describes the study of the corrosion behavior of XC 70 steel in sulfuric acid medium and the evaluation of the protective power of a series of synthesized compounds such as methyltriphenylphosphonium iodide and imidazoliumsalts (Bromure de 1-phényl-3- (3- (4,4,5,5- tétraméthyl-1,3,2-dioxaborolan-2-yl) propyl) -1Himidazol- 3-ium) (Bromure de 1- (pyrimidin-2-yl) -3- (3- (4,4,5,5-tétraméthyl-1,3,2-dioxaborolan-2-yl) propyl) -1-H-imidazol-de 3-ium). The study was carried out using the Tafel straight line method and electrochemical impedance spectroscopy. The results obtained show that methyltriphenylphosphonium iodide is a very effective mixed inhibitor and reaches a maximum of 83.71% at C = 30 ppm and for the rotational state of 1500 rpm; The inhibitory efficacy of this compound reaches a maximum of 97.80 % at C = 60 ppm and the results indicate that adsorption is following isotherm Langmur. On the other hand, imidazolium compounds such as imidazolium salts (Bromure de 1- phényl-3- (3- (4,4,5,5- tétraméthyl-1,3,2-dioxaborolan-2-yl) propyl) -1Himidazol- 3-ium) and (Bromure de 1- (pyrimidin-2-yl) -3- (3- (4,4,5,5-tétraméthyl-1,3,2-dioxaborolan-2- yl) propyl) -1-H-imidazol-de 3-ium) are very strong oxidants and increase the corrosion rate of XC 70 steel in 0.1M sulfuric acid H2SO4 medium.

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