Metallic materials are used in many applications due to their mechanical and physical properties. Under an aggressive environment, i.e. high temperature and/or corrosive environment these materials can be degraded at a fast rate. One way to protect the metal surface against corrosion is to apply the organic inhibitor material. The inhibitor will normally be chemically adsorbed by the surface of the metal; this will form a protective thin film. The current work is to investigate the influences of the Tarmarix plant as an organic material source for inhibiting carbon steel in corrosion media. The obtained results show that the changes in weight loss because of the corrosion in samples immersed in corrosion media containing 10% and 20% of Tarmaix; were less than in samples immersed in the same media without the Tarmaix. The corrosion rate decreased with time for all inhabitation specimens. The results revealed that longer time exposure to the inhibitor material results in higher inhibition efficiency which was above 90% efficiency. And the plots of C\θ versus C give straight lines with the linear correlation coefficient (R2) values close to unity, which follow the Langmuir adsorption isotherm. The slope ranges of these lines are 1.391 - 1.623 within the used immersion times. Therefore, it can be suggested that the absorbed molecules form a monolayer on the mild steel surface. The strong appearance of functional groups such as C-OH inside the structure of polyphenolics in the plant leaf extract of Tarmaix could probably be responsible for the reduction of metal ions and the formation of a protective layer that improved the corrosion process within the inhabitation samples.
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