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Article
Binary and Ternary Nanoceramic Coatings to Protect Carbon Steel in Artificial Seawater

Authors: Rana Afif Anaee --- Ahmed M. Al- Ghaban --- Douaa A. Abdullah
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2016 Volume: 34 Issue: 15 Part (A) Engineering Pages: 2854-2863
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Binary and Ternary nanoparticles coatings have been applied on carbon steel using atomization method (cold spraying) to corrosion control in seawater. Nanoparticles were included Nano Al2O3, SiC and ZrO2. The characterization of coated surfaces has been investigated by AFM and SEM in addition to calculate the coating thickness. The binary coatings deal with 50%Al2O3-50%SiC, 50%Al2O3-ZrO2 and 50%SiC-50%ZrO2, while the ternary coating was 60%Al2O3-20%SiC-20%ZrO2. The results showed that 50%Al2O3-50%SiC had the lowest thickness and most uniform distribution in AFM and SEM due to closing in particle sizes. Corrosion test achieved to estimate the corrosion resistance, protection efficiency and porosity percentage which indicated the role of Nano particle coating to corrosion control. These data showed that the Nano 50%Al2O3-50%SiC coating had the most noble corrosion potential, lowest corrosion current density (lowest corrosion rate), highest corrosion resistance, highest efficiency 99.651 % and lowest porosity percent 1.438×10-11. Cyclic polarization also estimated to show the probability for pitting corrosion. The coating with 50%Al2O3-50%SiC gave the highest breakdown potential equal to +69mV.


Article
Evaluation of polyurethane and polyurethane /polyvinyl chloride blend coatings on steel as corrosion protection using EIS technique
تقييم طلاء البولي يورثين وهجين البولي يورثين/بولي فاينل كلورايد لحماية الحديد من التأكل باستخدام تقنية EIS

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Abstract

This paper was aimed to evaluate the polyurethane (PU) and polyurethane/polyvinyl chloride (90 wt. % / 10 wt. %) as organic coating of carbon steel substrate against marine environment (3.5 wt.% NaCl aqueous solution) as a severe corrosion environment . The electrochemical impedance spectroscopy (EIS) and fitting impedance data by ZsimpWin 3.22 software were used to estimate the physical barrier of the samples for different exposure times. Different equivalent electrical circuits were proposed for the physical barrier at different immersion times to get appropriate fitting .Both PU and PU/PVC coatings showed excellent corrosion protection ability for steel .The PU/PVC coating showed better protection and stability than PU coating against aggressive salt solution. The relation between dielectric properties (impedance spectrum) of coating film with their behavior as physical barrier protection gave useful information about electrochemical process and predicts the barrier protective behavior in natural environment.

يهدف هذا البحث الى تقييم البولي يورثين وهجين البولي يورثين/بولي فاينل كلورايد ذو النسبة الوزنية (%90/10%) على التوالي كطلاء عضوي للكاربون ستيل ضد المحيط لتأكلي للاوساط البحرية 3.5% كلوريد الصوديوم. يتم مقاربة النتائج المستحصلة بواسطة برنامج ZsimWin3.22 لغرض تقييم الطلاءات كحواجز فيزيائية ولفترات تعرض مختلفة. حيث استخدمت دوائر كهربائية مكافئة مختلفة لغرض الحصول على افضل مقاربة للنتائج وجد ان كلا الطلائين ابديا حماية عالية في الوسط الملحي ،الطلاء الهجين ابدا استقرارية اكبر من طلاء البولي يورثين في المحيط شديد التأكل،ان العلاقة بين خـــواص العزل الكهربائي(داي الكترك) للطلاءوخواص الحاجز الفيزيائي يعطي معلومات مهمة حول العمليات الكيميائية المجهرية .


Article
The Effect of Adding Carbon (soot) to the Paint of an Absorbing Surface in Homemade Solar Systems
تأثير إضافة الكربون على الطلاء للسطح الماص في المجمعات الشمسية الحرارية

Author: Hala K. Saleh هالة قيدار محمد صالح
Journal: Rafidain journal of science مجلة علوم الرافدين ISSN: 16089391 Year: 2012 Volume: 23 Issue: 3E Pages: 137-143
Publisher: Mosul University جامعة الموصل

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Abstract

Absorbing materials are key components of any solar water heater device. Silicon solar cells are very efficient but are highly expensive. An alternative is to use absorbing materials that are cheaper than silicon to produce. The use of carbon (soot) in the preparation of the coating layer of a homemade solar water heater has been investigated. When added in different proportions to oil-based white paint, marked increases in water temperatures were obtained. The increase in water temperature was directly proportional with the increase in the percentage of carbon in the coating layer. The maximum achieved outlet water temperature was 90° C in July and 70° C in November.Due to its non-toxic nature and very low cost, carbon in the form of smoke suspension or soot, can provide a good and reliable alternative in the fabrication of domestic solar water heaters.

تعد المواد الماصة جزءا مهما لأي نظام سخان حراري شمسي. تكون خلايا السليكا الشمسية ذات كفاءة عالية جدا لكنها مرتفعة الكلفة أيضا. إن البديل هو استخدام مواد ماصة أرخص كلفة من السليكا عند الإنتاج. إن استخدام الكربون في تحضير طبقة الطلاء لسخان ماء شمسي قد تم اختباره. فعندما يضاف الكربون بنسب مختلفة إلى طلاء زيتي أبيض، نحصل على درجة حرارة ماء مرتفعة. يتناسب ازدياد درجة حرارة الماء طرديا مع زيادة نسبة الكربون المضاف إلى طبقة الطلاء. كانت أعلى درجة حرارة للماء °90 سليزية في تموز و°70 سليزية في تشرين الثاني.وبالنظر إلى طبيعة الكربون غير السامة ورخص كلفته، فإنه يوفر بديلا جيدا يمكن اعتماده في عمل سخانات الماء الحرارية المحلية الصنع.

Keywords

carbon --- coating --- solar heater


Article
Improvement of Hot Galvanizing By Nickel Under Layer

Author: Mohammed Hliyil Hafiz
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2008 Volume: 26 Issue: 6 Pages: 689-698
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Zn–Ni alloy based coatings have high corrosion resistance, good adherence andunique physical as well as mechanical properties. In the present work, nickel wasdispersed in the under layer of hot dip zinc coating (Galvanizing). showed substantialimprovement in physical as well as galvanic performance. The presence of nickel in theunder layer was found to result in good adherence, less porosity and better hardness .Thepresence of nickel decreases the thickness of the coating and enhances the corrosionresistance character.

الأكساء بسبيكة الزنك- نيكل تملك مقاومة عالية للتآكل ,التصاقية جيدة ,وخواص فيزيائية وميكانيكيةمتميزة . في هذا البحث طبقة النيكل تحت طبقة الغلونة(الطلاء بالتغطيس بالزنك المنصهر ) .الملاحظة الأساسية التحسن في الأدائية الفيزيائية (الكلفانية) . وجود طبقة النيكل التحتية قد أنتجتالالتصاقية الجيدة وقللة المسامية وازدياد الصلادة . أن وجود طبقة النيكل تقلل السمك الخاص بالغلونةوتعزز خاصية مقاومة التآكل .


Article
Evaluation of osseointegration using partially stabilized zirconia coated implants by electrophoretic deposition &dipping methods

Authors: Athraa Y.Al-Hijazi عذراء يحيى الحجازي --- Thair L.AL-Zubaydi ثائر الزبيدي --- Ban A. Al-Ghani بان الغاني
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2011 Volume: 23 Issue: special issue Pages: 42-46
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Partially stabilized Zirconia(PSZ)coated implant demonstrated the distinct effects on the surfacecomposition of the implant, and activates on osteoblasts. Zirconia improves cell proliferation significantly during thefirst days of implantation, and may improve attachment and adhesion strength of the implant. The aim of the studywas to evaluate the influence of the coated biomaterial (zirconium) on osseointegration of cpTi implantradiographically with mechanical test.Materials and Methods: Seventy-two commercially pure titanium implants(cpTi)were used in this study,(24)implantswere coated with PSZ by electrophoretic deposition(EPD)method,&(24) by dipping method, the rest24 implants wereused as controls, they were inserted in the tibia of (32)New Zealand white rabbits & were followed for 2,&6weeks.Mechanical torque removal test for evaluation of osseointegration was performed,Results: Results revealed that bone –implant contact (BIC), increased with time &that implants coated with PSZ bydipping method have shown higher torque mean values than those coated by EPD method.Conclusion: Dip-coating of the cpTi implants with PSZ, can be considered as an alternative coating method andenhance better bone implant contact than EPD.


Article
Histomorphometric analysis of bone deposition at Ti implant surface dip-coated with hydroxyapatite (In vivo study)

Authors: Athraa Y. Al-Hijazi عذراء الحجازي --- Thair L. Al-Zubaydi ثائر الزيدي --- Eman I. Mahdi ايمان مهدي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2013 Volume: 25 Issue: 2 Pages: 70-75
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Synthetic hydroxyapatite,(Ca10(PO4)6(OH2) can directly bond to bones without infection and fibrousencapsulation, thus is regarded as bioactive and biocompatible. The aim of the study was the estimation ofmicroarchitecture bone parameters include bone mass (gm/cm2) cortical bone width (mm), thread width (mm),marrow space star volume analysis (V*m) and osteoblast, osteocyte cell number.Materials and methods: Ninety-six (96) commercially pure titanium CpTi) used in this study, (48) implants were coatedwith HA by dipping coating and (48) implants were used as control. They were inserted in (32) Newzland white rabbitsand followed for 2 & 6 weeks. Mechanical torque removal test and histomorphometric analysis of bonemicroarchiteture were performed for evaluation of osseointegration.Results: Results revealed, Torque values were increased with advancing time for coated and uncoated groups. Andspecifically dip coated implant showed high value in comparison to control. Histomorphometric analysis for boneparameters showed highly significant difference in overall contrasted groups of implant in 2nd and 6th week interval.Conclusion: Dip coating method is an alternative coating technique for dental implant to enhance better boneimplant contact and improve osseointegration


Article
Water absorption and solubility of coated and non–coated silicone–based permanent soft liner

Authors: Zeina M Ahmad --- Ahmed A Al–Ali --- Munther N Kazanji
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2010 Volume: 10 Issue: 1 Pages: 162-168
Publisher: Mosul University جامعة الموصل

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Abstract

AIMS: To determine the period of time that a new generation of silicone–based, chairside, permanent soft liner resist absorption and solubility and determine the effect of coating material. MAERIALS AND MEHODS: Specimens of (Mucopren soft) soft liner were prepared, stored in water, and tested after 1 , 2 , 3 , and 8 months. Half of the specimens were coated with coating material supplied by manufacturer and the other half remained uncoated. Silica gel was used for drying and sensitive elec-tronic balance was used for weighing specimens. Universal formulas were used for calculating water absorption and solubility. T–test and ANOVA followed by Duncan multiple range test were used to determine the significant difference at P<0.05 level. RESULS: There was no statistically significant difference between coated and non–coated soft liner in relation to water absorption and solubility. There was no statistically significant difference in water absorption and solubility when comparing it among the periods of testing from the first month to the eighth months. Coating the soft liner decrease the percentage absorption and solubility of the silicone soft liner but this effect is statistically not sig-nificant. CONCLUSIONS: Mucopren soft– lining material has proved excellent resistance to solubili-ty for a long period (8 months). Water absorption is limited and are clinically accepted. Coating (Mu-copren soft) soft liner with coating material slightly improve the resistance to water absorption and solubility.


Article
Testing of Drinking Water Reservoirs Coating

Authors: Abbas H. Sulaymon عباس حميد سليمون --- Ali A. Merdaw
Journal: Iraqi Journal of Chemical and Petroleum Engineering المجلة العراقية للهندسة الكيمياوية وهندسة النفط ISSN: 19974884/E26180707 Year: 2007 Volume: 8 Issue: 1 Pages: 1-7
Publisher: Baghdad University جامعة بغداد

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Abstract

The present study refers to a ready-made three components epoxy based paint made by the Modern Paints Industries Company (Al-Za'farania, Baghdad) subjected to several tests in order to improve its specifications by optimizing the application conditions. The paint components are under the trade names: Resin (D-5547), Hardener (H-1457) and Thinner (P-851). The paint is used for painting drinking water reservoirs from inside. The main tests used in this study for optimizing and comparing between formulations and conditions, is the resistance to water absorption and the hardness of the coated film.


Article
Galvanic Corrosion Behavior of Electroless Nickel Coating in Al-Zubare Harbor-Water

Author: Mohammed Hliyil Hafiz
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2007 Volume: 25 Issue: 9 Pages: 1056-1063
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Electrode potentials in AL-Zubare harbor water (South -Gas Company),of 23.88 ohm-cm at 20oC were reported for 26 metals and alloys includingvalues for electroless nickels that signify a greater passivity than steel. Thelarge potential difference between steel and electroless nickel predicts severegalvanic corrosion, which was confirmed by weight loss data for coupled steeland electroless nickel electrodes immersed in AL-Zubare Harbor water(South -Gas Company, 23.88 ohm-cm at 20oC) .Changes in the phosphorouscontent in the range of 7.10 to 12.45 percent had only a slight effect on theelectrode potential of electroless nickel.This study indicates the beneficial use of electroless nickel coating is morepassive than other (metals and alloys) and that galvanic corrosion of activemetals such as steel can be severe .

سجلت قيم الجهد الكهربائي المقاس في مياه ميناء الزبير (الخاص بشركة غازالجنوب ذو المقاومة الكهربائية 23.88 أوم – سم بدرجة حرارة 20 مئوية) ل ( 26 ) معدنوسبيكة بضمنها الطلاء بالنيكل اللاكهربائي والذي دل على خمولية أكثر من الفولاذ. كان فرقالجهد الكهربائي الأكبر بين الفولاذ والنيكل اللاكهربائي ينبئ بشدة التآكل الكلفاني والذي تمأستخراج قيمه من البيانات الخاصة بفقدان الوزن لمزدوج أقطاب الفولاذ والنيكل اللاكهربائيالمغمورة في مياه ميناء الزبير. أن تغيير نسبة المحتوى الفسفوري ضمن المدى ( 7.1 إلى12.45 %) كان له تأثير قليل نسبي على مقدار الجهد الكهربائي لقطب النيكل. تشير الدراسةإلى فائدة استخدام طريقة الطلاء بالنيكل اللاكهربائي لكونه أكثر خمولية من بعض المعادنوالسبائك وان التآكل الكلفاني شديد للمعادن الفعالة مثل الفولاذ


Article
Corrosion Behavior of Bottom Plates of A potable Water Storage Tank

Author: Mohammed Hliyil Hafiz
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2008 Volume: 26 Issue: 6 Pages: 682-688
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

This paper describes the investigation of a corrosion behavior of bottom Plates of apotable water storage tank . The tank was internally inspected for the first time afterfourteen years of service. Paint blisters and rust spots were observed on the bottomplates. Sand blasting and repainting the bottom plates and shell plates were to be usedas a remedial work .However, during the sand blasting, holes and deep pitting were observed on thebottom plates. On-site visual inspection, magnetic flux leakage (MFL) inspection,ultrasonic testing (UT), and evaluation of the external cathodic protection (CP) systemwere used in the failure analysis. The failure is attributed to the ingress of water and itsimpoundment under the tank bottom along the periphery inside the ring wall and failureof water side epoxy coating.

هذا البحث يوصف سلوك التآكل الحاصل لقعر خزان ماء الشرب بعد أربعة عشر عاما منالاستخدام , وبعد فحصة لوحظ تفقع طبقة الصبغ وبقع الصدأ لقعر الخزان . . أثناء الفحص لوحظثقوب وتنقر عميق . تم إعادة صبغة بعد قصفة بالرمل للتنظيف و لإزالة بقايا نواتج التآكل كعلاج .منجهة أخرى أجريت فحوصات لا تدميرية (المغناطيسية ,فوق الصوتية ) لكشف التآكل غير المنظوروتقييم لعمل منظومة الحماية السالبة . أن سلوك التآكل يعزى إلى سيلان الماء وأحتجازة تحت الخزانعلى طول محيطة وفشل طلاء الأيبوكسي

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