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Article
Effect of Magnesium Addition on Corrosion Resistance of Aluminum -17%Silicon Alloy
تأثير أضافة المغنيسيوم على مقاومة االتآكل لسبيكة المينيوم – سيليكون 17%

Authors: Muna Khethier Abbass منى خضير عباس --- Khairia Salman Hassan خيرية سلمان حسن --- Kayser Aziz Ameen قيصر عزيز أمين
Journal: Al-Khwarizmi Engineering Journal مجلة الخوارزمي الهندسية ISSN: 18181171 23120789 Year: 2016 Volume: 12 Issue: 4 Pages: 50-58
Publisher: Baghdad University جامعة بغداد

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Abstract

The electrochemical behavior of Al-17%Si alloy is investigated in 3.5wt% NaCl solution. Many alloys with addition of the different wt% magnesium metal of 1wt%, 2%, 3wt% ,4.5wt% ,and 9wt% were prepared by gravity die casting . The microstructures of prepared alloys were examined by optical and SEM microscopes. Corrosion behavior was investigated by using potentiostat instrument under static potentials test and corrosion current was recorded to determine corrosion resistance of all prepared samples. It was found that the addition of Mg metal improves the corrosion resistance of Al-17%Si alloy in 3.5%NaCl solution. The alloy containing 1%Mg shows less corrosion rate than the others while the alloys containing 4.5%Mg, 9%Mg content have the better pitting corrosion resistance than other alloys.

في هذا البحث تم دراسة السلوك الكهروكيمياوي لسبيكة (Al- 17%Si) في محلول (3.5 wt% NaCl)، وذلك باضافة معدن المغنيسيوم للسبائك وبنسب مختلفة (1wt%, 2wt%, 3wt%, 4.5wt%, 9wt%) حيث تم تحضير السبائك بواسطة قوالب الصب بالجاذبية.وقد تم استعمال المجهر الضوئي والمجهر الالكتروني الماسح لفحص التركيب المجهري للسبائك. وتم بحث اسلوب التآكل بواسطة استعمال جهاز المجهاد الساكن (Potentiostat) وتحت اختبار الجهد الساكن وتم تسجيل تيار التأكل وحساب مقاومة التأكل لكل النماذج المحضرة. وقد لوحظ انه عند اضافة معدن المغنيسيوم يزيد من مقاومة التأكل في سبائك (Al-17%Si) في محلول (3.5% NaCl). ولوحظ ايضاً ان السبائك الحاوية على (1% Mg) اظهرت اقل معدل تآكل من السبائك الاخرى بينما كانت السبائك الحاوية على (9% Mg, 4.5% Mg) تمتلك افضل مقاومة للتاكل النقري من باقي السبائك.


Article
Effect of The Reinforcing by WC on Microhardness, Roughness and Corrosion Behavior of Al-12Si Alloy

Author: Hiba Anwer Abdullah
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2016 Volume: 34 Issue: 15 Part (A) Engineering Pages: 2891-2896
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

This work investigated the effect of Tungsten Carbide as reinforcement with 1, 2 and 3 wt.% on some properties of matrix Al-12Si alloy. Al-12Si/WC composites were fabricated by stir casting method. Micro hardness and roughness have been tested to investigate the role of WC reinforcing. Corrosion behavior of these composites also investigated in 0.2M HCl solution using the potentiostat instrument.The results show a good incorporation between the matrix and WC particles with probability to form Al12W and Al4C3 phase in addition to eutectic structure of Al-12Si alloy. The micro hardness was increased with increasing the weight percent of WC, while the roughness was decreased due to the better interfacial bonding. Corrosion protection properties of composites were better than that of base alloy due to the behavior of WC as a cathodic site which reduces the dissolution of metals from the metallic surface.

Keywords

Al-Si composites --- WC --- Stir casting.


Article
EFFECT OF Ti AND Sn ADDITIONS ON MECHANICAL PROPERTIES OF ALUMINUM- SILICON - COPPER ALLOY
تأثير اضافة Ti و Sn على الخواص الميكانيكية لسبيكة الومنيوم – سليكون - نحاس

Authors: Muhammad A. Fakhri --- Israa A. Alkadir اسراء عبد القادر عزيز
Journal: DIYALA JOURNAL OF ENGINEERING SCIENCES مجلة ديالى للعلوم الهندسية ISSN: 19998716/26166909 Year: 2016 Volume: 9 Issue: 4 Pages: 48-61
Publisher: Diyala University جامعة ديالى

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Abstract

This research is devoted to study the effect of adding alloying elements (Ti and Sn) with different percentages (1, 3 and 5) wt% on the microstructure, mechanical properties, and dry sliding wear resistance of Al-6.9wt%Si-1.7%Cu alloy.The particle size of Ti powder is 200 µm, but the Sn adding as a small bits to the alloy. The microstructures were examined with optical microscope for the base alloy before and after adding alloying elements. This examination showed that the changing occurs on the morphology of grain, precipitated intermetallic compounds and other phases (TiAl, TiAl2, Al2Cu and β-Sn) determined by the x-ray diffraction. The mechanical properties studied in this research were the tensile strength, impact toughness, and hardness. The results depicted that the ơu, ơy and hardness increase with increasing the percentage of Ti, while they decrease with increase the percentage of Sn. On the other hand, the alloys with Ti additions revealed that El% decrease with increasing Ti additions, but El% increase with increasing the Sn addition to the base alloy. Also, the impact toughness, was examined, and it was found alloying element was lower than the base alloy for both elements (Ti and Sn). The pin-on-disk technique was used to determine the wear resistance for base alloy before and after adding the alloying elements. The wear resistance increased with increasing the percentage of the Sn, but it decreased with increasing the percentage of Ti at different applied loads (2.5, 5 and, 7.5) N at a constant sliding speed of (3.7) m/sec.


Article
The Effect of (Ag,Ce) Addition on Corrosion Resistance of (Al-Si) Alloy

Authors: Abdulazeez Obeid Mousa Al-Uqaily* --- Jassim Mohammed Salman Al-Murshdy** --- Alhak Abd Muslim Hassan *
Journal: Journal of University of Babylon مجلة جامعة بابل ISSN: 19920652 23128135 Year: 2016 Volume: 24 Issue: 2 Pages: 400-408
Publisher: Babylon University جامعة بابل

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Abstract

Aluminum casting alloys with silicon as the major alloying elements are the most important commercial casting alloys because of their superior casting characteristics and as it is well known that (Al-Si) alloys, which are widely applied in the aerospace and automotive industries. This research aims to study the effect of silver and cerium (2.5% Ag, 2% Ce) elements added to (Al-Si) alloy. In this research was calculated Vickers microhardness and corrosion resistance by electrochemical method to master alloy before and after the addition of silver and cerium. The results showed that the addition of the silver element led to increase microhardness, decrease corrosion resistance, and either addition of cerium led to decrease microhardness, increase corrosion resistance and addition of elemental silver and cerium together led to increase microhardness, decrease corrosion resistance of (Al-Si) alloy. The results shown that the best corrosion resistance was in (C) alloy (Al- 6.37% Si- 2% Ce) while (B) (Al- 6.34% Si- 2.5% Ag) has better microhardness

تعد سبائك الألمنيوم المسبوكة مع السليكون كعنصر سبك رئيس من أهم السبائك التجارية بسبب امتلاكها خصائص سبك فائقة ولهذه السبيكة تطبيقات واسعة في صناعة السيارات والفضاء. يهدف هذا البحث إلى دراسة تأثير إضافة عنصري الفضة والسيريوم على سبيكة (ألمنيوم-سليكون) فقد تم احتساب الصلادة الدقيقة بطريقة فيكرز ومقاومة التآكل بالطريقة الكهروكيميائية للسبيكة الاساس قبل وبعد إضافة الفضة والسيريوم. وأظهرت النتائج إن إضافة عنصر الفضة أدت إلى زيادة الصلادة الدقيقة وانخفاض مقاومة التآكل اما اضافة السيريوم فأدى الى انخفاض الصلادة الدقيقة وزيادة مقاومة التآكل. وان اضافة عنصري الفضة والسيريوم معا للسبيكة الاساس ادى إلى زيادة الصلادة الدقيقة وانخفاض مقاومة التآكل. النتائج اظهرت ان افضل سبيكة مقاومة للتأكل هي السبيكة ( C ) بينما السبيكة ( B ) تمتلك افضل صلادة دقيقة .

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