Effectiveness of some Nonionic Surfactants As Corrosion Inhibitors for Carbon Steel in Hydrochloric Acid Solution

2013 ◽  
Vol 787 ◽  
pp. 211-215 ◽  
Author(s):  
Omnia A.A. El-Shamy
Keyword(s):  
Surface Tension ◽  
Carbon Steel ◽  
Hydrochloric Acid ◽  
Critical Micelle Concentration ◽  
Corrosion Inhibitors ◽  
Nonionic Surfactants ◽  
Steel Corrosion ◽  
Surface Excess ◽  
Compound I ◽  
Minimum Surface Area

The corrosion inhibition characteristics of the synthesized (I, II and III) nonionic surfactants on carbon steel corrosion in 1 M acid chloride have been investigated at 30 oC by potensiodynamic polarization. The obtained results show that compound I has the best efficiency at concentration 0.08 mmol/L while compound III is the best inhibitor at higher concentrations. The surface parameters of each synthesized surfactant were calculated from its surface tension including the critical micelle concentration (CMC), effectiveness of surfactant (π), maximum surface excess (Γmax) and the minimum surface area (Amin).

Investigation of the Inhibitive Effect of Hexatriethanolamine Derivatives on Corrosion of Carbon Steel Pipelines in 1M HCI

2013 ◽  
Vol 787 ◽  
pp. 216-221
Author(s):  
Omnia A.A. El-Shamy ◽  
Abdullah S. Al-Ayed
Keyword(s):  
Surface Tension ◽  
Carbon Steel ◽  
Critical Micelle Concentration ◽  
Surface Area ◽  
Corrosion Inhibition ◽  
Surface Activity ◽  
Inhibition Efficiency ◽  
Surface Excess ◽  
Corrosion Inhibition Efficiency ◽  
Minimum Surface Area

The corrosion inhibition efficiency of carbon steel pipelines in 1M HCl by the synthesized hexatriethyleneamine derivatives potensiodynamic polarization 30 oC. The results showed that all synthesized inhibitors were good inhibitors and their inhibition efficiencies were significantly increased with increasing concentration. The surface activity were calculated from its surface tension measurements including the critical micelle concentration (CMC), effectiveness of surfactant (π), maximum surface excess (Γmax) and the minimum surface area (Amin).

Corrosion inhibition of some azole derivatives on carbon steel in hydrochloric acid solution

2014 ◽  
Vol 61 (5) ◽  
pp. 300-306 ◽  
Author(s):  
B.P. Markhali ◽  
R. Naderi ◽  
M. Sayebani ◽  
M. Mahdavian
Keyword(s):  
Carbon Steel ◽  
Hydrochloric Acid ◽  
Organic Compounds ◽  
Corrosion Inhibitors ◽  
Inhibition Efficiency ◽  
Electrochemical Impedance ◽  
Acid Corrosion ◽  
Molecular Structures ◽  
Inhibition Mechanism ◽  
Content Type

Purpose – The purpose of this paper is investigate the inhibition efficiency of three similar bi-cyclic organic compounds, namely, benzimidazole (BI), benzotriazole (BTAH) and benzothiazole (BTH) on carbon steel in 1 M hydrochloric acid (HCl) solution. Organic inhibitors are widely used to protect metals in acidic media. Among abundant suggestions for acid corrosion inhibitors, azole compounds have gained attention. Design/methodology/approach – The inhibition efficiency of the three organic compounds was investigated using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). Findings – Superiorities of BTH and BTAH corrosion inhibitors were shown by EIS data and polarization curves. Moreover, the results revealed that BTAH and BTH can function as effective mixed-type adsorptive inhibitors, whereas no inhibition behavior was observed for BI. Both BTAH and BTH obeyed Longmuir adsorption isotherm. The results obtained from this isotherm showed that both inhibitors adsorbed on the specimen surface physically and chemically. The difference in inhibition efficiencies of BTAH, BTH and BI was related to the presence of nitrogen and sulfur hetero atoms on their molecular structures. Originality/value – This study evaluated inhibition efficiency of BI, BTAH and BTH using electrochemical methods. In addition, the study attempted to find inhibition mechanism of the inhibitors and to find modes of adsorption of the inhibitors, correlating effects of heteroatoms and inhibition efficiency.

Studies on carbon steel corrosion in molybdate and silicate solutions as corrosion inhibitors

1991 ◽  
Vol 247 (2-3) ◽  
pp. 352-359 ◽  
Author(s):  
Jiann-Ruey Chen ◽  
Huei-Yun Chao ◽  
Yuh-Lin Lin ◽  
Iua-Jou Yang ◽  
Jung-Chou Oung ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Corrosion Inhibitors ◽  
Steel Corrosion
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