15 research outputs found
Adsorption of benzotriazole on mercury from different base electrolytes
224-226Electrocapillary curves for 1M solutions of NaCl, NaNO3 and Na2SO4 in the presence of different concentrations of benzotriazole show that the organic compound adsorbs both on positively and negatively charged metal surfaces. The extent of adsorption from these base electrolytes follows the order Na2SO4 > NaNO3 > NaCl. Thermodynamic parameters like charge on the metal surface (qM), the surface excess of organic molecule adsorbed (org), surface coverage (q) and free energy of adsorption (- G) are evaluated and presented. The adsorption of benzotriazole on mercury obeys Langmuir’s adsorption isotherm in all the cases, irrespective of the nature of the base electrolyte used
The influence of N‐heterocyclics on corrosion inhibition and hydrogen permeation through mild steel in acidic solutions
The adsorption of thiosemicarbazide at the mercury/phosphoric acid solution interface
959-963Adsorption of thiosemicarbazide on the mercury electrode from 0.2 N phosphoric acid has been studied using a capillary electrometer. Electrocapillary curves have been obtained in the presence of different concentrations of the adsorbate. Thermodynamic parameters like charge on the metal surface (qM) and surface excess of organic molecules adsorbed (Gorg) have been calculated. From the adsorption data, it is clearly seen that the adsorption of this compound obeys Temkin's adsorption isotherm. The variation of free energy of adsorption with charge on the metal surface has been explained
Synergistic influence of iodide ions on the inhibition of corrosion of mild steel in sulphuric acid by cyclohexylamine
167-171The synergistic inhibition of corrosion of mild
steel in 0.5 M H2SO4 by a combination of cyclohexylamint
(CHA) and iodide ions has been studied using different electrochemical
techniques. Corrosion inhibition is found to decrease with increase in the
concentration of CHA. Iodide ions are found to enhance the inhibition by CHA
considerably. Synergistic parameters such as S1, and Sθ
obtained from values of inhibition efficiency and surface coverage are found to
be more than unity. This observation clearly shows the synergistic influence of
iodide ions on the corrosion inhibition by CRA. The adsorption of CHA alone and
in combination with iodide ions obeys Langmuir's adsorption isotherm.</span
Thiophenol as an inhibitor for the corrosion and hydrogen permeation through mild steel in acidic solutions
Influence of anions on corrosion inhibition and hydrogen permeation through mild steel in acidic solutions in the presence of <i>p</i>-tolyl thiourea
68-73The influence of anions such as chloride
and sulphate on the inhibition of corrosion of mild steel by p-tolyl
thiourea (PTTU) in 1N HCl and 1N H2SO4 has been studied
using weight loss and gasometric measurements, Galvanostatic polarisation studies
and ac impedance measurements. The compound is found to be less inhibitive in 1N
HCl than in 1 N H2SO4. The influence of p-tolyl thiourea
on the extent of hydrogen permeated through mild steel in acidic solutions has been
studied using electro-permeation technique. The compound is found to enhance
the permeation of hydrogen through mild steel in both the acids. The adsorption
of p-tolyl thiourea on the mild steel surface from both the acids obeys Temkin's
adsorption isotherm. The increase of charge transfer resistance (Rt)
and decrease in double layer capacitance (Cd1) values of the
metal electrode in the presence of the test compound (PTTU) show the adsorption
of the compound on the metal surface
Influence of anions on the performance of anisidines as inhibitors for the corrosion of mild steel in acidic solutions
168-174<span style="font-size:11.0pt;line-height:115%;
font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:arial;mso-ansi-language:en-us;mso-fareast-language:="" en-us;mso-bidi-language:ar-sa"="">The influence of anisidines on the corrosion of
mild steel in 1N HCI and 1N H2SO4 has been
investigated by weight loss, gasometric and some other electrochemical techniques.
Anisidines are found to be inhibitive in 1N HCI. In 1N H2SO4,
o–anisidine inhibits the corrosion at all concentrations whereas m –anisidine
inhibits at concentrations more than 20 mM. However, p–anisidine
accelerates the corrosion at all concentrations. They behave predominantly as
cathodic inhibitors in 1N HCI and inhibit the corrosion in 1N H2SO4.These
bring down the permeation of hydrogen through mild steel in 1N HCI and
enhance it in 1N H2SO4,The adsorption of
anisidines on the metal surface is found to obey Langmuir's adsorption
isotherm.</span