کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1428480 1509173 2015 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of secondary phase and grain size on the corrosion of biodegradable Mg–Zn–Ca alloys
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد بیومتریال
پیش نمایش صفحه اول مقاله
Effects of secondary phase and grain size on the corrosion of biodegradable Mg–Zn–Ca alloys
چکیده انگلیسی


• Effects on the bio-corrosion behaviour are illustrated.
• Both second phase volume fraction and grain size are key factors.
• Balanced secondary phase volume fraction and grain size are desirable.

The bio-corrosion behaviour of Mg–3Zn–0.3Ca (wt.%) alloy in simulated body fluid (SBF) at 37 °C has been investigated using immersion testing and electrochemical measurements. Heat treatment has been used to alter the grain size and secondary phase volume fraction; the effects of these on the bio-corrosion behaviour of the alloy were then determined. The as-cast sample has the highest bio-corrosion rate due to micro-galvanic corrosion between the eutectic product (Mg + Ca2Mg6Zn3) and the surrounding magnesium matrix. The bio-corrosion resistance of the alloy can be improved by heat treatment. The volume fraction of secondary phases and grain size are both key factors controlling the bio-corrosion rate of the alloy. The bio-corrosion rate increases with volume fraction of secondary phase. When this is lower than 0.8%, the dependence of bio-corrosion rate becomes noticeable: large grains corrode more quickly.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: C - Volume 48, 1 March 2015, Pages 480–486
نویسندگان
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