Petroleum quaternary ammonium surfactants mixture synthesized from light naphtha as corrosion inhibitors for carbon steel in 1 m HCl

2013 ◽  
Vol 31 (2) ◽  
pp. 61-72 ◽  
Author(s):  
Houria Hamitouche ◽  
Abdellah Khelifa ◽  
Amel Kouache ◽  
Saâd Moulay
Keyword(s):  
Carbon Steel ◽  
Quaternary Ammonium ◽  
Cationic Surfactants ◽  
Electrochemical Impedance ◽  
Acid Corrosion ◽  
Light Naphtha ◽  
Optimal Value ◽  
Quaternary Ammonium Surfactants ◽  
Microscopy Images ◽  
Quaternary Ammonium Cationic Surfactants

AbstractA quaternary ammonium cationic surfactants mixture was synthesized from light naphtha, petroleum fraction. The mixture was analyzed by Fourier transform infrared spectroscopy and UV/Visible spectroscopy and was evaluated as a corrosion inhibitor for carbon steel in 1 m HCl, by gravimetry, potentiodynamic polarization and electrochemical impedance spectroscopy. The results showed that inhibiting efficiency increased with inhibitor concentration and temperature, and was independent of pH (in the range of 0–4) and immersion time; its optimal value was up to 84% for 560 mg/l at 25°C. Experimental data showed that the cationic surfactants mixture acts as a mixed (anodic and cathodic) inhibitor and conformed to the Langmuir adsorption isotherm. Scanning electron microscopy images revealed the inhibiting capacity of the mixture against carbon steel acid corrosion.

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.

Surface enhanced infra-red spectroscopy with modified silver nanoparticles (AgNPs) for detection of quaternary ammonium cationic surfactants

2019 ◽  
Vol 43 (21) ◽  
pp. 8109-8121 ◽  
Author(s):  
Ramsingh Kurrey ◽  
Manas Kanti Deb ◽  
Kamlesh Shrivas
Keyword(s):  
Silver Nanoparticles ◽  
Water Samples ◽  
Quaternary Ammonium ◽  
Cationic Surfactants ◽  
Single Drop ◽  
Single Drop Microextraction ◽  
Surface Enhanced ◽  
Infra Red ◽  
Quaternary Ammonium Cationic Surfactants

A novel surface enhanced infra-red spectroscopy (SEIRS) method with silver nanoparticles (AgNPs) assisted by single drop microextraction (SDME) was developed for detection of total mixed quaternary ammonium cationic surfactants (QACS) in water samples.

Limitations of the Phenolphthalein Competition Method for Estimating Cyclodextrin Binding Constants

1995 ◽  
Vol 48 (3) ◽  
pp. 551 ◽  
Author(s):  
JE Gray ◽  
SA Maclean ◽  
VC Reinsborough
Keyword(s):  
Quaternary Ammonium ◽  
Cationic Surfactants ◽  
Binding Constants ◽  
Primary Amines ◽  
Cyclodextrin Complexes ◽  
Heterocyclic Ligands ◽  
Cyclodextrin Inclusion Complexes ◽  
Cyclodextrin Inclusion ◽  
Alkyl Sulfates ◽  
Quaternary Ammonium Cationic Surfactants

The phenolphthalein competitive spectrophotometric technique was used to obtain binding constants for cyclodextrin complexes for a variety of both inclusates and cyclodextrins . The former included alkane-1-sulfonates (C5-C12), alkyl sulfates (C6, C8, C12) and several heterocyclic ligands, and the latter included β-cyclodextrin, dimethyl-β-cyclodextrin and γ- cyclodextrin . The technique was not successful for either α- cyclodextrin or trimethyl -β- cyclodextrin inclusion complexes, or with many primary amines and quaternary ammonium cationic surfactants. However, for many colourless inclusates this method is a simple, convenient, reliable route to cyclodextrin binding constants.

Sign in / Sign up

Export Citation Format

Share Document