Application of lentil seed extract as an inhibitor to assess the corrosion properties of copper-nickel alloys in a NaCl environment.

Weight loss (WL), electrochemical, and surface analysis were used to explore the efficiency of lentil seed extract (LSE) in mitigating the electrochemical corrosion of Cu-10Ni and Cu-30Ni alloys in obviously aerated water. The adsorption of lentil seed extract (LSE) species to create a barrier layer improved the corrosion resistance of Cu-Ni alloys in a NaCl medium. It was shown that the temperature of the medium and the amount of extract used affected the enhanced inhibitory efficacy. Using the PDP approach, the Cu-10Ni alloy showed the maximum inhibition performance (IE) of about 98.58% and 8.53% with 300 ppm LSE, respectively. According to the findings, the studied extract had a good ability to slow down the step at which alloys corroded in a 3.5% NaCl solution. It was discovered that as the temperature rose, the rate of corrosion increased. The thermodynamic activation functions of the dissolution process were also calculated as a function of extract dose. PDP curve analysis reveals that LSE is a mixed-type inhibitor, and EIS findings demonstrates that increasing dose not only alters the charge transfer ( R ct ) of Cu-10Ni alloy from 1031 to 2984 Ω cm 2 and for Cu-N30Ni alloy from 3093-6208 Ω cm 2 but also changes the capacitance of the adsorbed double layer ( C dl ) for Cu-10Ni alloy from 728-678 μF cm 2 and for Cu-30 Ni alloy from 726 to 701 μF cm 2 . The inhibitor's adsorption provides a good fit for the "Freundlich, Temkin, and Langmuir isotherm" models. Several methods are used to confirm that the alloy surface has a protective coating.