Grafted Biopolymers as Corrosion Inhibitors (for True Epub): Safety, Sustainability, and Efficiency by Jeenat Aslam & Chandrabhan Verma & Ruby Aslam

Author:Jeenat Aslam & Chandrabhan Verma & Ruby Aslam [Aslam, Jeenat & Verma, Chandrabhan & Aslam, Ruby]
Language: eng
Format: epub
ISBN: 9781119881384
Published: 2023-06-01T10:11:23+00:00

10.2.4.1 Apparent Activation Energy

The apparent activation energy (Ea) is analyzed through Arrhenius equation mentioned in Equation (10.4). Here plots of log(ϕ) vs. 1000/T (Figure 10.3) are prepared to calculate the required values and the slope of the plot is used to calculate the value of Ea. The relation used for the purpose is Ea = −(slope) × 2.303 × R. The values of Ea play a very important part in understanding the nature of corrosion inhibitor adsorption. It has been reported that the decrease or near constancy of the Ea values indicates chemical interaction between the corrosion inhibitors and the substrate. Here the electron-rich sites of corrosion inhibitors directly donate the π, n electrons to the vacant d orbitals of the metallic surface. The protective film hence generated is very stable and can provide superior protection at elevated temperatures. Figure 10.3a represents the Arrhenius plots of such a molecule (FTTI). The obtained Ea values are represented in Figure 10.3b, and it can be observed that the obtained values are slightly lower than the blank solution. With the increase in the concentration of the corrosion inhibitors, the values of Ea attain a neat constancy. These observations suggest the chemisorption of the corrosion inhibitors upon the metal surface [11, 57]. If the values of Ea rise increase in corrosion inhibitor dosage, then the adsorption of the inhibitor molecules occurs through charged interaction with the metal surface, i.e., physisorption.

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