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فصل اول: مقدمه………………………………………………………………………………………………….. 1
1-1- مقدمه ………………………………………………………………………………………………………………………….. 2
فصل دوم: مروری بر منابع مطالعاتی………………………………………………………………………. 4
2-1- مقدمه …………………………………………………………………………………………………………………………… 5
2-2- تاریخچه سل ژل……………………………………………………………………………………………………………. 5
2-3- اکسیدهای فلزی و اکسیدهای فلزی مخلوط………………………………………………………………… 6
2-4- انواع روش های پوشش دهی………………………………………………………………………………………… 6
2-4-1- رسوب شیمیایی بخار………………………………………………………………………………………………. 6
2-4-2- رسوب فیزیکی بخار…………………………………………………………………………………………………. 6
2-4-3- پاشش پلاسمایی……………………………………………………………………………………………………… 7
2-4-4- آبکاری الکتریکی……………………………………………………………………………………………………… 7
2-4-5- الکترولس…………………………………………………………………………………………………………………. 7
2-5- فرآیند سل ژل………………………………………………………………………………………………………………. 7
2-5-1- اصول فرآیند سل ژل………………………………………………………………………………………………. 10
2-5-2- بررسی اثر عوامل مختلف بر فرآیند سل ژل…………………………………………………………… 12
2-5-2-1- اثر pH ……………………………………………………………………………………………………………… 12
2-5-2-2- اثر غلظت و طبیعت کاتالیست………………………………………………………………………….. 12
2-6- روش های مختلف اعمال پوشش در فرآیند سل ژل……………………………………………………. 13
2-6-1- پوشش دهی چرخشی…………………………………………………………………………………………….. 13
2-6-2- پوشش دهی توسط اسپری……………………………………………………………………………………… 13
2-6-3- پوشش دهی غوطه وری………………………………………………………………………………………….. 14
2-7- مزایا و معایب پوشش های سل ژل………………………………………………………………………………. 16
2-8- خوردگی آلومینیم…………………………………………………………………………………………………………. 17
2-9- سنتز پودر اکسید فلزی مخلوط Al2O3/MgO/TiO2 به روش سل ژل…………………….. 18
2-10- سنتز پوشش اکسید فلزی مخلوط Al2O3/MgO/TiO2 به روش سل ژل………………. 19
2-11- مروری بر دیگر پوشش های سل ژل اکسیدهای فلزی مخلوط…………………………………. 20
2-12- مروری بر بررسی خواص خوردگی پوشش های اکسیدی سل ژل…………………………….. 24
فصل سوم: مواد، تجهیزات و روش آزمایش ……………………………………………………………. 34
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مقدمه…………………………………………………………………………………………………………………………….. 35
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مواد اولیه………………………………………………………………………………………………………………………. 35
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آلیاژ آلومینیم 1100………………………………………………………………………………………….. 35
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مواد شیمیایی……………………………………………………………………………………………………… 35
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تهیه محلول پایه…………………………………………………………………………………………………. 36
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3-2-3-1- سل S1 …………………………………………………………………………………………………………… 36
3-2-3-2- سل S2 …………………………………………………………………………………………………………… 36
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آماده سازی نمونه های آلومینیم 1100…………………………………………………………….. 37
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فرآیند پوشش دهی به روش غوطه وری……………………………………………………………. 37
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نحوه خشک کردن نمونه ها………………………………………………………………………………… 37
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نحوه عملیات حرارتی نمونه ها……………………………………………………………………………. 37
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تجهیزات و آزمون های اجرا شده………………………………………………………………………………….. 39
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