Corrosion inhibition of Cu-Ni (90/10) alloy in a medium (0.5M NaCl) by nalco inhibitor of diprochim

The study relates to the characterization of the electrochemical behaviour of the alloy cu-10ni in the medium with 0,5m nacl with and without inhibitor at the ambient temperature. the inhibiting effect of (nalco based on amines) with various concentrations,was studied by the stationary and nonstationary electrochemical methods. the study thus underlined,a value of 35ppm,critical concentration in inhibitor at temperature 25°c,a rate of covering of the surface of 0,9243 for a maximum of effectiveness of 92,43%.means of characterization such,cathodic and anodic polarization as well as optical microscopy and dispersive analysis x in energy (eds),were used to characterize the external products of corrosion. a suitable equivalent land pattern was employed for calculates the various parameters. in agreement with the literature,the results of the curves of potentiodynamic polarization reveal that the inhibitor functions like an inhibitor mixed. inhibition occurs by adsorption,creating a fall of the ph at the point of null load what returns the load of film of more negative surface with ph neutral and consequently less likely to the adsorption of species charged negatively like the ions cl-. in comparison with the results,in agreement with the data of the literature [ ],the product of corrosion formed on alloy for a concentration of 35ppm in inhibitor,is a compound of cuò in the internal layer,and of cuo in the external layer. for a concentration higher than 35ppm,a porous and not-protective layer of corrosion is formed on alloy,its composition is a mixture of cucl,cu2o,nio with traces of cuo and component most significant ni(oh)2. the electrochemical spectroscopy of impedance (eis) confirms the presence of an organic film external,playing the part of a barrier layer,protective side. the cyclic metric volta diagrams obtained confirm the stability of protective film of the inhibitor even to the anodic potentials of +550 millivolts. all these studies indicate that the inhibitor reacts like an excellent inhibitor in the case of the alloy cu-nor 90/10) in the studied medium.