نشریه علوم و مهندسی سطح

نشریه علوم و مهندسی سطح

بررسی خواص ریزساختاری، سختی و خوردگی پوشش کامپوزیت مس-نیکل/گرافن ساخته شده به‌روش جریان‌دهی پالس

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشگاه زنجان
2 دانشگاه ازاد زنجان
چکیده
در این پژوهش، تاثیر ورود نانوورقه‌های گرافن بر خواص ریزساختاری، سختی و رفتار خوردگی پوشش آلیاژ CuNi ساخته شده به روش آبکاری پالسی مورد بررسی قرار گرفت. نتایج ریزساختاری نشان داد در اثر افزودن نانوورقه‌های گرافن در زمینه آلیاژ CuNi، مورفولوژی سطحی از مورفولوژی گره‌ای به مورفولوژی با گرانول‌های کروی تغییر کرده‌است، که این تغییر ساختار سطحی منجر به افزایش زبری سطح پوشش از 33 به 56 نانومتر برای پوشش کامپوزیت شده‌است. از طرفی در اثر پراکنده‌سختی به‌دلیل حضور درات فاز دوم گرافن، سختی حدود 20 درصد افزایش پیدا کرده‌است. بررسی‌های خوردگی نشان داد حضور گرافن در زمینه آلیاژ به‌عنوان موانع فیزیکی عمل کرده و با کاهش سطح فعال فلزی مقاومت در برابر خوردگی را افزایش داده‌است. به‌عبارتی نفوذ مایع خورنده را به تعویق انداخته و از این طریق نرخ خوردگی را کاهش داده‌است. دانسیته جریان خوردگی برای نمونه کامپوزیت خوردگی از 6-10×8/1 به 7-10×6/6 آمپر بر سانتی‌متر مربع نسبت به نمونه آلیاژ افزایش پیدا کرده‌است. همچنین حضور ورقه‌های گرافن، باعث مثبت‌تر شدن پتانسیل خوردگی و نجیب‌تر شدن نمونه کامپوزیت شده‌است.
کلیدواژه‌ها

موضوعات


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