Adsorption and Extortion, Their Role in Inhibiting Corrosion Rate, and Calculating Thermodynamic Functions

Mutlak Saud  Khalaf; Ban Khalil  Ali; Luma Ismail  Ibrahem; Ibrahim Abdullah  Ali

doi:10.51699/cajotas.v6i4.1597

Mutlak Saud Khalaf Ghatfan Preparatory School for Boys, Ministry of Education, Salah Aldin, Iraq
Ban Khalil Ali Thi Qar Education Directorate
Luma Ismail Ibrahem Thi Qar Education Directorate
Ibrahim Abdullah Ali College of Education for pure Science Tikrit University, Salah Al-Din, Iraq

DOI: https://doi.org/10.51699/cajotas.v6i4.1597

Keywords: corrosion, adsorption, extortion, metal, cathode, inhibitor

Abstract

The adsorption of reactants by a catalyst (solid) in a heterogeneous catalyst flowing in a gaseous medium or in solutions was calculated. In thermodynamic functions, adsorption is accompanied by a decrease in the standard free energy of Gibbs because it is a spontaneous process. Therefore, it is accompanied by a decrease in entropy and enthalpy The free energy values at temperatures (293, 303, 313, 323) were (58.286, 53.746, 55.846, 57.066) respectively. The free energy, enthalpy and entropy were also calculated from the Capps relationship, using the equilibrium constants with temperature. The values of corrosion rate and surface coverage ratio (ᶿ) were calculated in (0.1M) sulfuric acid in the absence of inhibitors. The values of corrosion and ratio (ᶿ) at a temperature of (300 K) were (12.08, 966^5-10×) respectively,and Each metal has a certain number of active centers, which results in the amount( ᶿ), which represents the center covered by molecules through chemical adsorption. The gravimetric method is also used, where vacuum devices are used, including balances, and the measurement is carried out by weighing the adsorption surface (0.0000000001) g of the substance. A corrosion cell is also used to protect the metal, where anode-type electrodes are used, made of a metal more active than the metal to be protected. The corrosion cell consists of an anode, a cathode, an electrolyte, and a salt bridge.

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