Investigation of Thermodynamic Parameters for Steel Corrosion in Acidic Solution in the Presence of N,N′-Bis(phloroacetophenone)-1,2 propanediamine

Abstract

N,N 0 -Bis(phloroacetophenone)-1,2-propanediamine as corrosion inhibitor for steel in hydrochloric acid has been studied using electrochemical techniques and surface techniques. Results showed that the inhibition occurs through adsorption of the inhibitor molecules on the metal surface. The inhibition efficiency was found to increase with increasing inhibitor concentration and decreased with increasing temperature. Thermodynamic parameters for adsorption and activation processes were determined. Polarization data indicated that this compound acts as the mixed-type inhibitor and the adsorption basically obeys the Langmuir adsorption isotherm. The quantum chemical calculations were performed at the density functional theory level using B3LYP functional with the 6-31G (d,p).

Surface Interaction and Corrosion Inhibition of Mild Steel in Hydrochloric Acid Using Pyoverdine, an Eco-Friendly Bio-molecule

“…Corrosion inhibitors are substances that are added in small quantities to corrosive media to retard the corrosion rate. The surface interaction and the protection layer formation depend on the structure and concentration of inhibitors [1,2], microstructure of metal surface, temperature of exposure, pH of the reaction medium and the extent of immersion time [3][4][5][6].…”

Corrosion Inhibition of Mild Steel in Aqueous Sulfuric Acid Solution Using Heterocyclic Mercapto Compounds – An Experimental and Theoretical Study

“…In Table 2, it can be seen that by increasing the inhibitor concentration, the polarization resistance increases in the presence of both of the compounds, implying the adsorption of the inhibitor on the metal surface which blocks the active sites efficiently and inhibits corrosion [4,20]. The values of cathodic and anodic Tafel slope (bc,ba) for both of studied molecules are found to change in the presence of the inhibitor.…”

“…The central problem with this material and generally with other metals is their vulnerability to corrosion, hence their surface must be protected from this undesired process. The protection of metals, apart from the use of classic inhibitors [1][2][3][4][5][6][7], can be also accomplished through the employment of surface modification strategies via chemical or electrochemical methods such SAM's (Self Assembled Monolayers) formed from silanes [8,9], phosphonic acids [10,11], sodium oleate [12] or electrochemical reduction of aryldiazonium salts on metals [13,15], with the exclusion of 2,6-dimethylbenzene diazonium salt [15]. Nearly all of the important acid inhibitors are organic compounds containing N, O, P, S, and aromatic ring or triple bonds.…”

“…Nearly all of the important acid inhibitors are organic compounds containing N, O, P, S, and aromatic ring or triple bonds. It was proclaimed previously that the inhibition efficiency decreases in the order: O>N>S>P [3,4]. Density functional theory has become a convenient method to decipher experimental results, permitting one to obtain structural parameters for molecules [3].…”

Corrosion Study of Mild Steel in Aqueous Sulfuric Acid Solution Using 4-Methyl-4H-1,2,4-Triazole-3-Thiol and 2-Mercaptonicotinic Acid—An Experimental and Theoretical Study

“…However, mild steel as many other metals is prone to corrosion, hence their surface must be protected from this undesired process (Migahed et al, 2004 ). The protection of metals, apart from the use of classic inhibitors (Sanyal, 1981 ; Selvi et al, 2003 ; Fouda and Ellithy, 2009 ; Obi-Egbedi et al, 2011b ; Finšgar and Jackson, 2014 ; Berisha et al, 2015b ; Mohsenifar et al, 2016 ), might be achieved by chemical or electrochemical surface modification such as, SAM's (Self-Assembled Monolayers) formed from silanes (Palanivel et al, 2005 ; Van Ooij et al, 2005 ), phosphonic acids (Abohalkuma and Telegdi, 2015 ; Kosian et al, 2016 ), sodium oleate (Shubha et al, 2013 ), or electrochemical reduction of aryldiazonium salts on metals (Chaussé et al, 2002 ; Berisha et al, 2011 , 2015a ). Nearly all of the important acid inhibitors are organic molecules containing heteroatoms like nitrogen, oxygen, phosphorous, sulfur, etc.…”