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Article
The Inhibition Effect of Peach Juice on Corrosion of Low Carbon Steel in Hydrochloric Acid at Different Temperatures

Authors: Hadeel F. Ibraheem --- Aprael S. Yaro ابرائيل سركيس يارو
Journal: Iraqi Journal of Chemical and Petroleum Engineering المجلة العراقية للهندسة الكيمياوية وهندسة النفط ISSN: 19974884/E26180707 Year: 2010 Volume: 11 Issue: 1 Pages: 65-76
Publisher: Baghdad University جامعة بغداد

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Abstract

The corrosion inhibition of low carbon steel in1N HCl solution in the presence of peach juice at temperature (30,40,50,and 60)°C at concentration ( 5, 10, 20, 30, 40and 50 cm3/L)were studied using weight loss and polarization techniques. Results show that the inhibition efficiency was increased with the increase of inhibitor concentration and increased with the increase of temperature up to 50ºC ,above 50ºC (i.e. at 60 ºC) the values of efficiency decreases. Activation parameters of the corrosion process such as activation energies, Ea, activation enthalpies, ∆H, and activation entropies, ∆S, were calculated. The adsorption of inhibitor follows Langmuir isotherm. Maximum inhibition efficiency obtained was a bout 91% at 50ºC in the 50 cm3/L inhibitor concentration. The polarization curves show that peach Juice is a mixed inhibitor


Article
Anodic Polarization of Mild Steel in Saturated Ca(OH)2 Contaminated with NaCL in Presence of NaNO2

Authors: Hany S. Hassan --- Aprael S. Yaro ابرائيل سركيس يارو
Journal: Iraqi Journal of Chemical and Petroleum Engineering المجلة العراقية للهندسة الكيمياوية وهندسة النفط ISSN: 19974884/E26180707 Year: 2007 Volume: 8 Issue: 2 Pages: 39-42
Publisher: Baghdad University جامعة بغداد

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Abstract

The corrosion behavior of mild steel in saturated aerated and dc-aerated Ca(OH)2 solution was investigated using electrochemical measurements. The work was carried out with small coupons immersed in soIw ions containing dWèrent quantities of MaC in presence of various NaNO concentrations w corrosion inhibitors. It has been found that:(I) In presence of NaCI the time required to reach °2 evolution potential in dc-aerated Ca(0h9 polarized at lOpA/cm is function of inhibitor concentration and it becomes lass as NaNO increases compared with zero presence indicating the effectiveness of PIaNO as anodic corrosion inhibitor. (2) In absence of NaC1, the time required to reach 01 evolution potential in de solutions is less that in aerated solutions when inhibitor increases from 0 to 0.3 wt%. (3) In presence of sufficient chloride in dc-aerated Ca(OI-i9, solution, the passive film m broken down locally.


Article
Corrosion Inhibition of Aluminum Alloy 5083

Authors: Huda A. Dahyool --- Aprael S. Yaro ابرائيل سركيس يارو
Journal: Iraqi Journal of Chemical and Petroleum Engineering المجلة العراقية للهندسة الكيمياوية وهندسة النفط ISSN: 19974884/E26180707 Year: 2009 Volume: 10 Issue: 4 Pages: 19-25
Publisher: Baghdad University جامعة بغداد

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Abstract

The corrosion inhibition of aluminum alloy .5083 by an environment friendly compound called (8- Hydroxyquinoline) in acidic and alkaline solutions ofpH (2 and 12) respectively were studied using weight loss and polariza techniques. Also to examine the main and combined effects of the inhibitor concentration, pH. and contact time using factorial experimental design. Results show that corrosion rate decreased with increasing both inhibitor concentration and contact time and increased with increasing pH value. The polarization curves show that 8-hydroxyquinoline is a cathodic inhibitor


Article
Phenyl Thiourea as Corrosion Inhibitor for Mild Steel in Strong Hydrochloric Acid

Authors: Aprael S. Yaro ابرائيل سركيس يارو --- Dhuha A. Abdulaaima
Journal: Iraqi Journal of Chemical and Petroleum Engineering المجلة العراقية للهندسة الكيمياوية وهندسة النفط ISSN: 19974884/E26180707 Year: 2012 Volume: 13 Issue: 2 Pages: 1-9
Publisher: Baghdad University جامعة بغداد

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Abstract

The inhibitive action of Phenyl Thiourea (PTU) on the corrosion of mild steel in strong Hydrochloric acid, HCl, has been investigated by weight loss and potentiostatic polarization. The effect of PTU concentration, HCl concentration, and temperature on corrosion rate of mild steel were verified using 2 levels factorial design and surface response analysis through weight loss approach, while the electrochemical measurements were used to study the behavior of mild steel in 5-7N HCl at temperatures 30, 40 and 50 °C, in absence and presence of PTU. It was verified that all variables and their interaction were statistically significant. The adsorption of (PTU) is found to obey the Langmuir adsorption isotherm. The effect of temperature on the adsorption process showed that the adsorption process is exothermic, spontaneous and represents mixed chemical and physical adsorption for PTU on the metal surface.


Article
Cathodic Protection of Copper Pipes Carrying Saline Water in the Presence of Aerobic Bacteria

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Abstract

Rates of zinc consumption during cathodic protection of a copper pipeline carrying saline water were measured by the loss in weight technique. The study of sacrificial anode cathodic protection of short copper tube using zinc strip extended axially in the pipe revealed that : (i) The increase of zinc consumption with time of exposure (1-3 h's) at different flow rates (turbulent flow) (300-600 l/hr) while the temperature , solution concentration and the pH were fixed at 20ºC, 3.5%wt NaCl, and pH=8 respectively in absence and presence of bacteria.(ii)Increase of zinc consumption with flow rates (300-600 l/hr) at different temperatures (10-40ºC) while solution concentration and time of exposure were fixed at 3.5 %wt NaCl and 3hr's respectively, in absence and presence of bacteria. (iii) Increase of zinc consumption with flow rates (300-600l/hr) at different solution concentrations (1-3.5 %wt NaCl) while the time of exposure and temperature were fixed at 3h's and 30ºC respectively in absence and presence of bacteria. Generally the Zn consumption during cathodic protection ranges from (2.424- 26.741 g/m2) and (5.352-27.296g/m2) in absence and presence of bacteria respectively.


Article
Electrochemical Behavior of Chemical Conversion Coated Aluminum ASA6061in Chromic Acid

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Abstract

The corrosion behavior of bare and chemical conversion coated (through anodizing) aluminum AS4 6061 in stagnant chromic acid solutions. Solutions of 2, 6 & lO wt% Cro3, at 45°C have been investigated using polarization ion technique. The anodizing experiments were conducted under fixed conditions of 35 minute exposure time and 30 volt supplied voltage. The most important feature achieved was the great d(fference in behavior between the anodic polarization curves for bare and anodized aluminum in different concentrations of chromic acid solutions.


Article
Polyvinyl Alcohol – Sodium Nitrite Water Soluble Composite as a Corrosion Inhibitor for Mild Steel in Simulated Cooling Water

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Abstract

The inhibitive action of polyvinyl alcohol –sodium nitrite (PVASN) composite on the corrosion of mild steel in simulated cooling water (SCW) has been investigated by weight loss and potentiodynamic polarization. The effect of composite concentration (PVA/SN) , pH, and exposure time on corrosion rate of mild steel were verified using 2 levels factorial design and surface response analysis through weight loss approach, while the electrochemical measurements were used to study the behavior of mild steel in (SCW) with pH between 6 and 8 and in absence and presence of (PVA) in solution containing different concentration of NaNO2. It was verified that all three main variables studied were statistically significant while their interaction is less pronounced.


Article
Corrosion Inhibition of Low Carbon Steel in Different HCl Concentrations by Phenythiourea

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Abstract

Phenylthiourea (PHTU), was tested as inhibitor for the corrosion of low carbon steel in different HCl acid concentration by mass loss, and polarization measurements. It was found that (PHTU) is a good inhibitor for the corrosion of low carbon steel in 1, 3, and 5N HCl solution, and its inhibition efficiency () increases with its concentration and attains approximately 97% at 1 g/l. Polarization curves indicate that (PHTU) acts as an anodic type inhibitor. The inhibitor was adsorbed on the low carbon steel surface according to the Langmuir adsorption isotherm model. Results show that the rate of corrosion of low carbon steel increased with increasing temperature over the range 30-60 C, both in the presence of inhibitor and its absence. It was found also that the inhibiting effect of the inhibitor is generally acid concentration independent.


Article
Corrosion Inhibition of Galvanic Couple Copper Alloy/Mild Steel in Cooling Water System

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Abstract

The driving idea for the present work was to combine the effect of polyvinyl alcohol (PVA) as corrosion inhibitor with the distance between the anodic and cathodic elements of the galvanic cell, beside their area ratio, in scope of synergistic suppression of galvanic corrosion on Cu/Fe model couple, using weight loss method. The performance affecting galvanic corrosion process has been tested for three major factors affect the process:1.Four PVA inhibitor concentrations were selected to be (0, 1000, 4000 and 7000 ppm) in simulated cooling water.2.Two cathode: anode area ratios as 1:1 and 2.4:1.3.Two distances apart cathode – anode as 3 and 7 cm. Maximum corrosion inhibition achieved was 86% which indicates that increasing inhibitor concentration leads to decrease dissolution process followed hydrogen evaluation Cu electrode as cathode element in galvanic cell.


Article
Corrosion Inhibition of Mild Steel by Curcuma Extract in Petroleum Refinery Wastewater

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Abstract

The inhibitor property of curcuma longa L. extract in different concentrations of simulated refinery wastewater (0.05% - 2% wt) and at various temperatures (30, 35 and 40 ˚C) is investigated using weight loss method. The results show that the presence of about 1.2 % (v/v) of curcuma extract gives about 84% inhibition indicating its effectiveness on mild steel corrosion in simulated refinery wastewater, besides the adsorption process on the mild steal surface obeys the Langmuir adsorption isotherm.

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