Effect of fluid flow, pH and tobacco extracts concentration as organic inhibitors to corrosion characteristics of AISI 1045 steel in 3.5% NaCl environment containing CO2 gas

Comparison of corrosion inhibitor performance based on green corrosion inhibitor of extract leaf tobacco and commercial imidazoline inhibitor in a sweet environment at carbon steel AISI 1045 in NaCl 3.5% solution

“…So, the reaction in the test sample is more dominant when compared with the reaction in the solution. it is same with result of tobbaco inhibitor [20]. And for EIS testing for both inhibitors is that the addition of an inhibitor increases the value of polarization resistance (Rp).…”

“…However, from the results of FTIR testing, XRD showed that the mechanism of inhibition of corrosion inhibitor imidazoline is Chemisorption. From [20] tobacco inhibitor has same mechanism that was physisorption because -2,44854 kj/mol dan 1,192738 kJ/mol in pH 4 and pH 7. The mechanism of action of imidazoline-based corrosion inhibitors is from the molecular structure of on the head, having 2 nitrogen atoms.…”

“…With the presence of this C-H group, making imidazoline compounds have the ability to hydrophobic or reject water molecules [30]. And with result reserch of [20] tobacco inhibitor samples there are functional groups C = N (oximes) and C-H (ketones) which are included in the functional group portion of nicotine. Where the molecular formula of nicotine itself is C 10 H 14 N 2 which has functional groups C = N and C-H.…”

“…Thus, the surface area of steel in direct contact with the electrolyte will be reduced. This causes a decrease in the rate of corrosion When compared with Tobacco inhibitor reserch by [20] optimal performance is 86.51% at pH 7 with concentration 132.5 ppm and the low rate is 7.85 cm/s, while in pH 4 show the ef iciency inhibition from tobacco extract is 74.69% with concentration 265ppm. It is possible that toccaco inhibitors have a low ef iciency compared to imidozoline inhibitors Figure 1 and Figure 2, in terms of results for both still include a good inhibitor.…”

“…The composition of tobacco consists of ash, sugar, phenol, nitrate, and nicotine. The effectiveness of natural material extract as a corrosion inhibitor is due to nitrogen content in tobacco leaf, chemical compounds, such as nicotine, hydrazine, alanine, quinoline, aniline, pyridine, amine, and others [20]. The mechanism of natural material extracts for protection of iron or steel from corrosion attack is estimated to be almost the same as the mechanism of protection by organic inhibitors.…”