The Role of Phosphonate Derivatives on the Corrosion Inhibition of Steel in HCL Media

Abstract

The inhibition of corrosion of steel by two P-containing compounds, sodium methyldodecyl phosphonate and sodium methyl (11-smethacryloyloxyundecyl) phosphonate, in hydrochloric acid has been investigated at various temperatures using electrochemical techniques (impedance spectroscopy (EIS), potentiodynamic polarization) and weight loss measurements. Inhibition efficiency (E%) increased with phosphonate concentration. Adsorption of inhibitors on the steel surface in 1 M HCl follows the Langmuir isotherm model. EIS measurements showed that the dissolution process of steel occurred under activation control. Polarization curves indicated that inhibitors tested acted as cathodic inhibitors. The temperature effect on the corrosion behavior of steel in 1 M HCl without and with the inhibitor was studied in the temperature range from 313 to 353 K. The adsorption free energy and activation parameters for the steel dissolution reaction in the presence of phosphonates were determined

New Mechanism Synthesis of 1,4-Benzothiazine and its Inhibition Performance on Mild Steel in Hydrochloric Acid

“…When both of these features combine, enhanced inhibition can be observed. Several amines [3][4][5], aminothiols [6][7][8], thio-compounds [9][10][11][12], triazole [13][14][15][16], tetrazole [17][18][19], imidazole [20][21][22], thiazoles [23][24], phosphonate [25] and surfactants [26,27] exhibit good inhibitory effect in hydrochloric acid. Notwithstanding several structural similarities with some of the above mentioned compounds, the derivatives of benzothiazine have not been studied, in our knowledge, as steel corrosion inhibitors.…”

Inhibition of Mild Steel Corrosion in 0.25 M Sulphuric Acid Solution by Imatinib Mesylate

“…5 Most of the well known acid inhibitors are organic compounds such as those containing nitrogen, sulphur, oxygen atoms and aromatic rings. [6][7][8][9][10][11][12] These substances in general are effective through adsorption on the metal surface. Compounds containing both nitrogen and sulphur groups generally give rise to satisfactory inhibition efficiency in the case of iron corrosion in acid medium.…”

Corrosion Inhibition and Adsorption Behavior of Malachite Green Dye on Aluminum Corrosion

“…A useful strategy is to effectively isolate the metal surface from the corrosive agents, which can be achieved by use of corrosion inhibitors. Several groups of organic compounds, especially those containing polar groups such as nitrogen, sulfur, and oxygen as well as heterocyclics containing conjugated double bonds have been reported to exert inhibitive effects on metal corrosion via adsorption at the metal=corrodent interface (Madkour et al, 1999;Kliskic et al, 2000;Shao et al, 2002;Branzoi et al, 2002;Maayta and Al-Rawashdeh, 2003;Abdallah, 2004;Mehra and Soni, 2004;Benabdellah et al, 2007;Doulami et al, 2004;Anuradha et al, 2008;Migahed and Al-Sabagh, 2009). In this case, the metal acts as an electrophile and the polar functions of the inhibitor molecule act as nucleophiles, with free electron pairs that are readily available for sharing with the metal surface.…”