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Article
Corrosion Inhibition of Carbon steel on Hydrochloric acid Using Zizyphus Spina – Chritisi Extract
دراسة الفعل التثبيطي لمستخلص أوراق السدر على الفولاذ الكاربوني في حامض الهيدروكلوريك

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Abstract

Naturally occurring substances are increasingly being tried to used as corrosion inhibitors of metals in acid cleaning processes to replace some toxic and expensive chemicals currently in use. The corrosion inhibition of carbon steel in hydrochloric acid by Zizyphus Spina – Chritis leaves extract was studied using weight loss techniques. Maximum inhibition efficiency and surface coverage were obtained at an optimum concentration. However, an increase in temperature lead to decreased in the inhibition efficiency at the temperature studied. Optimum inhibition efficiency for carbon steel in the presence of Zizyphus Spina – Chritis leaves extract was 99.5%, 75% and 66% at 1%,1%and 2% concentration of the inhibitor at 25oC, 35oC and 45oC respectively. The phenomenon of physical adsorption has been proposed from the activation energy values (55.66KJmol-1). The surface coverage (θ) data augment the above observation and the inhibition is attributed to the physical adsorption of the chemical components of the additive on the surface of the carbon steel. Inexpensive environmentally safe inhibitor formulations indicate have been obtained.

جرت محاولات عديدة لأستخدم المواد المستخلصة من المواد الطبيعية كمانعات تآكل للعديد من المعادن في عمليات التنظيف بالحامض وذلك لاستبدال بعض المواد الكيماوية الغالية والسامة والتي تستخدم لهذا الغرض. لذا تم في هذا البحث دراسة استخدام مستخلص أوراق السدر في تثبيط تآكل الفولاذ الكاربوني في محلول 0.5M من حامض الهيدروكلوريك وباستخدام طريقة الفقدان بالوزن.تم تحديد أقصى كفاءة تثبيط واكبر جزء من المعدن مغطى بالمثبط حيث بلغت أقصى كفاءة تثبيط 99.5% و 75% و 66% وذلك عند تراكيز من المثبط 1% و 1% و 2% وعند درجات حرارة 25م و 35م و 45م على التوالي. حيث بينت النتائج بأن هذا المستخلص قادر على إيقاف ذوبان الفولاذ الكاربوني وبمدى واسع يعتمد على تركيز المضاف وكذلك زمن التعرض للحامض.. كما أكدت حسابات مساحة السطح المغطى (θ) الاستنتاج السابق. وقد بينت النتائج المستحصلة بأن عملية التثبيط تتم من خلال الأمتزاز الفيزيائي للمكونات الكيميائية للمضاف على سطح الفولاذ الكاربوني.


Article
Preparation and Investigation of Some New Pyrazole Derivatives as Corrosion Inhibitors for Mild Steel in Acidic Media

Authors: Zahraa Talib Khudhair --- Mehdi Salih Shihab
Journal: Al-Nahrain Journal of Science مجلة النهرين للعلوم ISSN: (print)26635453,(online)26635461 Year: 2016 Volume: 19 Issue: 2 Pages: 33-42
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

Preparation of some new pyrazole derivatives by using a few steps starting from 4-acetylaniline to prepare azo compound (3). Chalcone derivatives (A1-A3) were obtained by reaction compound (3) with a proper aldehyde(benzaldehyde,4-(N,N-dimethylamino) benzaldehyde, terephalaldehyde). Chalcone derivatives (A1-A3) reacted with a proper hydrazine (hydrazine hydrate, phenyl hydrazine) to yield pyrazole derivatives (B1, B2, B3, B4, B5, B6). All prepared structure compounds were confirmed using spectroscopic and1H-NMR techniques. Prepared compounds (B1, B2, B3, B4, B5, B6) were successfully applied as organic corrosion inhibitors for mild steel in 1M H2SO4 solution at 30oC by using a weight loss method. The results of weight loss measurements showed that corrosion inhibition efficiency by increasing the concentration of organic inhibitors for mild steel in 1M H2SO4 solution at 30oC.

تم تحضير بعض مشتقات البيرازول بعدة خطوات ابتداءا من 4- اسيتايل انيلين لتحضير مشتقات صبغة الازو (3) ومن ثم تم تحضير الجالكونات (A1,A2,A3) بواسطة تفاعل تكاثف الالدول باستخدام الديهايدات مختلفة (البنزلديهايد, ن, ن – ثنائي مثل امينو بنزيلديهايد و الترفثلديهايد). بعد ذلك تم تحضير مشتقات البيرازول (B1,B2,B3,B4,B5,B6) من خلال تفاعل الجالكونات مع الهيدرازين والفينل هيدرازين. تم تشخيص المركبات المحضرة بطرق فيزيائية وتقنيات طيفية. المركبات المحضرة النهائية تم استخدامها كمثبطات لتأكل معدن الحديد المعتدل في وسط حامضي وبدرجة حرارة 30م0. نتائج قياسات طريقة الوزن المفقود لعملية التثبيط كانت ممتازة لتثبيط التأكل في الوسط الحامضي لمعدن الحديد المعتدل حيث اظهرت النتائج التجريبية زيادة كفاءة التثبيط مع زيادة وزن المادة العضوية المثبطة.


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
Effects of H2SO4 and HCL Concentration on the Corrosion Resistance of Protected Low Carbon Steel
تأثير تركيز حامض الكبريتيك وحامض الهيدروكلوريك على مقاومة التآكل للصلب منخفض الكاربون المحمي

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Abstract

AstractInvestigations were carried out to study the corrosion behavior of unprotected and protected low carbon steel using carburizing and hard chrome plating in different concentrations of H2SO4 and HCL solutions. Weight loss method was used for estimation the corrosion rate in the current study.Theresults show that protected low carbon steels samples by hard chrome platinghad better corrosion resistant (less corrosion rate) than unprotected and carburized low carbon steel samples. Also, the corrosion rate increaseswith increasing acid concentration from (1 to 5)M. for both types of acid used. The corrosion rate of low carbon steel in acid environments indicate that the hydrochloric acidsolution was more corrosive media thanthat of sulphuric acid solutionunderthe same conditions.Keywords:Corrosion rate;Acid environments;Low Carbon Steel;weight loss method.

الخلاصةتم في هذا البحث دراسة سلوك تآكل الصلب منخفض الكاربونغير المحمي من التآكل والمحمي من التآكل باستخدام الكربنة والطلاء بالكروم في تراكيز مختلفةلمحلول حامض الكبريتيك ومحلول حامضالهيدروكلوريك.طريقة فقدان الوزن استخدمت لتقدير معدل التآكل في هذه الدراسة.من النتائج التي تم الحصول عليها ، تبين ان نماذج الصلب منخفض الكاربون المحمي من التآكل بطلاء الكروم أعطتأفضل مقاومة للتآكل(اقل معدل تآكل)من نماذج الصلب غير المحمي ونماذج الصلب المحمي بالكربنة. كما ان معدل التآكل يزداد مع زيادة نسبة تركيز الحامض من( 1 الى 5 ) مولالي لنوعي المحاليل الحامضية المستخدمة . وان نتائج معدل التآكل للصلب منخفض الكاربون في الأوساط الحامضية تبين بانمحلول حامض الهيدروكلوريك كان وسطاً تآكلياًأكثرتأثيرا من محلول حامض الكبريتيك تحت نفس ظروفالاختبار.


Article
Synergistic Effect of Potassium Iodide on Inhibitive Performance of Propyl Alcohol during Corrosion of Mild Steel in 1.0M HCl

Authors: Aprael. S.Yaro --- Basma A. Abdul Majeed --- Elaf Q. Atiyah
Journal: Iraqi Journal of Chemical and Petroleum Engineering المجلة العراقية للهندسة الكيمياوية وهندسة النفط ISSN: 19974884/E26180707 Year: 2016 Volume: 17 Issue: 1 Pages: 61-70
Publisher: Baghdad University جامعة بغداد

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Abstract

The inhibition of mild steel corrosion in 1.0M HCl by 1-propanol and the synergistic effect of potassium iodide (KI) was investigated using weight loss and polarization techniques in the temperature range (30 ‒ 50) ̊ C. A matrix of Doelhert to three factors was used as the experimental design, adopting weight loss results as it permits the use of the response surface methodology which exploited in determination of the synergistic effect as inhibition on the mild steel. The results were confirmed using electrochemical polarization measurements. Experimental results showed that the inhibition efficiency (IE%) increases with increase in concentration of inhibitor and with increasing of temperature. The addition iodide ions to alcohol (inhibitor) enhanced the inhibition efficiency due to synergistic effect. Potentiodynamic polarization studies showed that the studied compound is mixed-type inhibitor causing blocking of active sites on the mild steel surface .The adsorption of the inhibitor and its combination with iodide ions on mild steel surface followed Langmuir adsorption isotherm via physisorption mechanism, which was proposed based on values of adsorption Gibbs free energy difference ΔGads. Statistically, the multi-variable regression equation describes the behavior of the corrosion inhibition process with high accuracy (correlation coefficient R2 between 0.974 and 1).


Article
Corrosion Inhibition of Carbon Steel in Hydrochloric Acid under Dynamic Conditions

Authors: Q.J.M. Slaiman --- Jaafar C. Eirs
Journal: Iraqi Journal of Chemical and Petroleum Engineering المجلة العراقية للهندسة الكيمياوية وهندسة النفط ISSN: 19974884/E26180707 Year: 2016 Volume: 17 Issue: 4 Pages: 1-10
Publisher: Baghdad University جامعة بغداد

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Abstract

In this work, studying the effect of ethylenediamine as a corrosion inhibitor was investigated for carbon steel in aerated HCl solution in range of 0.1-1N under dynamic conditions, i.e., rotational velocity of 400–1200 rpm in the temperature range 35 – 65 ºC. Weight loss method was employed in absence and presence of the inhibitor as an adsorption type in concentration range 1000 – 5000 ppm using rotating cylinder specimens. The experimental results showed that corrosion rate in absence and presence of inhibitor is increased with increasing temperature, rotational velocity and concentration of acid. It is decreased with increasing inhibitor concentration for the whole range of temperature, rotational velocity and concentration of acid solution. Under these conditions maximum inhibition efficiency obtained was 86% while minimum inhibition efficiency was 36%. The adsorption of this inhibitor on carbon steel surface is found to obey Langmuir adsorption isotherm.

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