| Investigation of corrosion resistance AZ63-1.5lanthanides in seawater solution |
| کد مقاله : 1165-17THECSI |
| نویسندگان |
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رضا شمس خانی *، علی اصغر ابراهیمی ولموزوئی، امین عابدینی گروه آموزشی مواد پیشرفته و نانوفناوری، دانشکده فنی و مهندسی، دانشگاه امام حسین (ع)، تهران، ایران |
| چکیده مقاله |
| In spite of its impressive corrosion resistance, AZ63 alloys cannot satisfy the increasing demands for higher corrosion resistance, especially for long-term submersion in seawater [1-3]. Rare elements can dramatically increase corrosion resistance in AZ63 alloys. In this study, corrosion resistance of AZ63-1.5% mischmetal RE elements (AZ63-1.5RE) is compared with the AZ63 alloy. The self-corrosion process involves both alloys being more corrosion prone at the beginning, and then gradually decreasing as immersion continues (Fig. 1). Corrosion rates of AZ63 and AZ63-1.5RE alloys are 0.054 and 0.042 mg cm‒2 h‒1, respectively. Thus, chemical corrosion resistance of AZ63-1.5RE is higher than that of AZ63 alloy. As a result of the addition of %1.5RE, the OCP value shifted to a more negative value (from ‒1.509 to ‒1.536 V vs SCE) (Fig. 2a). The 1.5%RE alloy has lower anodic Tafel slope (0.038 mV dec‒1) and the lower current corrosion (0.26 mA cm-2), therefore it has the lowest corrosion polarization (51.90 Ω cm2). The EIS plots (Fig. 2b) show that with an Rct of 298 Ω cm2 and an Rl of 180 Ω cm2, the as-cast alloy has an Rp of 112.22 Ω cm2. The addition of RE helps in increasing the corrosion resistance of the alloy by formation of rod like Al–RE phases. The Al-RE phase acts as a corrosion resistant phase and forms before the solidification of β and α phase, therefore reducing the amount of Al available for β formation and it acts as a nucleating agent, which leads to grain refinement. |
| کلیدواژه ها |
| Magnesium Alloy, Corrosion, Self-corrosion, Anode |
| وضعیت: چکیده برای ارائه به صورت پوستر پذیرفته شده است |