The inhabitation performance of tamarix material upon mild steel substrate in acid medium
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Date
2022
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جامعة سبها
Abstract
Under the aggressive environment the metallic materials can be depredated as a
corrosion process. One way to protect the metal surface against corrosion is
applied the organic inhibitor material. The inhibitor is chemically adsorbed the
surface of the metal forming a protective thin film. The current work is
investigated the influences of tarmarix plant as an organic material source for
inhibiting carbon steel in corrosion media. The obtained results show that the
changes in weight loss in samples immersed in corrosion media contain 10% and
20% of Tarmaix material were less that without the inhibitor material. This may
attributed to the Tarmaix material play a role in reducing the attaché of chlorine
ions onto the substrate surface. Also, corrosion rate decreased with exposure time
for all inhabitation specimens. One reason for this phenomenon may be attributed
to the slower corrosion reactions emanating from test environment due to
contamination by the corroding test metal in solution. In addition, the results
revealed that after 5 hrs and 50 %, the inhibitor material showed a higher inhibition
efficiency which was slightly above 90%. And, the plots of C\ɵ versus C gives
straight lines with the linear correlation coefficient ( R2
) values close to unity,
which follow the Langmuir adsorption isotherm. The slope ranges of these line are
1.391- 1.623 within the used immersion times. Therefore, it can be suggested that
the absorbed molecules form monolayer on mild steel surface. The strong
appearing of functional groups such as C-OH (figure 4.6 b) inside the structure of
polyphenolics in the plant leaf extract of tarmaix could be probably responsible for
the reduction of metal ions and formation a protective layer improved the corrosion
process within the inhabitation samples.
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Keywords
mild steel, tarmarix plant, corrosion, organic inhibitor