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Article
Surface Modification of Multiwall Carbon Nanotubes for Metal Matrix Nan composite Applications
تهيئة سطوح انابيب الكاربون النانوية لملائمة تطبيقات المواد المتراكبة النانوية ذات الاساس المعدني

Authors: Ahmed Ali Moosa --- Abdul Qader Faisal --- Righdan Mohsen Namus
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2014 Volume: 32 Issue: 7 Part (A) Engineering Pages: 1859-1869
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

MWCNTs first functionalized by using two steps covalent functionalization process. Functionalized MWCNTs coated with copper by using electroless coating process. Three different groups of Cu/MWCNTs nanocomposites with (0.1, 0.5, 1, 2, 3 wt% MWCNTs) were prepared by means of powder technology. The first group contains multiwalled carbon nanotubes as received (Cu/MWCNTs), second group contains functionalized multiwalled carbon nanotubes (Cu/FMWCNTs) while the third group contains coated multiwalled carbon nanotubes (Cu/CMWCNTs). Comparison between these samples show that the coating of MWCNTs was remarkably improve hardness and wear resistance of copper nanocomposite. The improvement in mechanical properties is due to the enhancement in both adhesion with matrix and dispersion ability of MWCNTs. SEM, XRD, FTIR were used to characterize of coating process and Cu/MWCNTs nanocomposites.

في البداية تم توظيف انابيب الكاربون النانوية باستخدام التوظيف التساهمي وعلى مرحلتين. انابيب الكاربون النانوية الموظفة تم طلاءها بمعدن النحاس باستخدام (Electroless coating process). ثلاث مجاميع من المواد المتراكبة النانوية ذات الارضية النحاسية تم تحضيرها باستخدام تكنولوجيا المساحيق بنسب وزنية مختلفة من انابيب الكاربون النانوية. احتوت المجموعة الاولى على انابيب الكاربون النانوية كما هي واحتوت المجموعة الثانية على انابيب الكاربون النانوية الموظفة بينما احتوت المجموعة الثالثة على انابيب الكاربون النانوية المطلية. بينت المقارنة بيت هذه العينات ان عملية الطلاء قد حسنت وبشكل ملحوظ الصلادة ومقاومة البلا للمادة المتراكبة النانوية. ان التحسن في الخواص يمكن ارجاعه هنا الى زيادة كل من الالتصاق مع الارضية و قابلية التشتت لانابيب الكاربون النانوية. تم استخدام (SEM, XRD, FTIR) لتوصيف عملية الطلاء وكذلك لتوصيف المواد المتراكبة النانوية ذات الاساس المعدني.


Article
Improving Surface Properties of Inconel 600 Alloy by Electroless Ni-P Deposition

Authors: Hassan. H. Masallb --- Kadhim F. Al-Sultani --- Abdul Raheem. K. Abid Ali
Journal: Al-Qadisiyah Journal for Engineering Sciences مجلة القادسية للعلوم الهندسية ISSN: 19984456 Year: 2019 Volume: 12 Issue: 4 Pages: 254-259
Publisher: Al-Qadisiyah University جامعة القادسية

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Abstract

The use of electroless Ni-P plating (EN) coating has attracted a surprising interest in the most recent years. Many useful characteristics of the electroless-plating method have created many benefits in different industries such as oil, gas, electronic, automotive, aerospace, and chemical. Some of the highlighted properties of such a method are superior corrosion resistance, superior mechanical properties, and uniform thickness of the coating as well as good surface finish properties, good adhesion characteristics, and a wide range of thickness. In this paper, electroless plating has been applied in a (Ni-P) bath at two different times of 2 and 3 hr respectively. After the plating, a heat treatment at 400 °C for an hour under vacuum 10-4 torr has been done. The prepared samples were characterized by energy dispersive spectroscopy, X-ray diffraction, and scanning electron microscopy (SEM). In addition, micro-hardness and corrosion rate following Tafel extrapolation in two acidic solutions (1M HCl and 1M H2SO4) were also determined. Vickers hardness values for specimens, coated by Ni -P at 2 and 3 hr have increased by 47 % and 32 % respectively. X-ray diffraction analysis for the coated surfaces showed two phases of Ni3P and NiP, presented before and after heat treatment. The SEM images of the cross sectional coated specimens revealed that the thickness of the coating is 68.43 and 92.71 μm for 2 and 3 hr coating time, respectively. Tafel analysis showed that the coated specimens had a lower corrosion current density compared to that for the bare specimens. The corrosion current density for the coated specimens in 1M H2SO4 increased by 57 % with 2 hr and 69 % at 3 hr coating time. While, the corrosion current density for the coated specimens in 1M HCl increased by 37 % and 83 % at 2 and 3 hr coating time respectively.

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