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Email this article Struktur Mikro, Sifat Mekanik, Dan Ketahanan Korosi Paduan Mg-Zn-Ca Yang Dihasilkan Melalui Proses Metalurgi Serbuk [Microstructure, Mechanical And Corrosion Properties of Mg-Zn-Ca Alloy via Powder Metallurgy]
Abstract
Magnesium (Mg), known for its biodegradable and biocompatible properties, currently is being developed for biodegradable implant material. Unfortunately, application of Mg in biomedical devices was limited due to its low mechanical strength and low corrosion resistance. In this study, powder metallurgy was selected to process Mg-3Zn-1Ca, Mg-29Zn-1Ca, and Mg-53Zn-4.3Ca (in weight%) alloys. Holding time of sintering were varied for five and ten hours. Microstructure of Mg alloy was characterized by SEM (scanning electron microscope) and also XRD (x-ray diffraction). Compression testing was done to show the mechanical strength of Mg alloy, while corrosion resistance was examined through electrochemical testing. This study showed that ten hours of sintering time would increase mechanical properties of Mg alloy but would reduce corrosion resistance. The lowest corrosion rate was 0.32 mmpy given by Mg-29Zn-1Ca alloy and Mg-53Zn- 4Ca alloy which were sintered for five hours. Therefore, sintering time for five hours was found to be the optimum time to process Mg-Zn-Ca alloy for biodegradable implant material.
Abstrak
Magnesium (Mg), dengan kemampuan mampu luruh dan biokompatibilitas, merupakan salah satu logam yang kini dikembangkan sebagai material implan mampu luruh. Namun, penggunaan Mg dalam aplikasi biomedis masih terkendala kekuatan dan ketahanan korosi yang rendah. Pada penelitian kali ini proses metalurgi serbuk dipilih untuk membuat paduan Mg-3Zn-1Ca, Mg-29Zn-1Ca, and Mg-53Zn-4.3Ca (dalam %berat) dengan variasi waktu tahan sintering lima jam dan sepuluh jam. Pengaruh waktu tahan sintering dikaji dari segi kekuatan tekan dan ketahanan korosi paduan. Karakterisasi struktur mikro paduan Mg dilakukan dengan menggunakan scanning electron microscope (SEM) dan juga x-ray diffraction analysis (XRD). Dilakukan pengujian tekan untuk mengetahui nilai kekuatan paduan sedangkan ketahanan korosi dianalisis dengan menggunakan pengujian elektrokimia. Waktu tahan sintering selama 10 jam akan meningkatkan kekuatan mekanik namun menurunkan ketahanan korosi paduan. Laju korosi yang terbaik (0,32 mmpy) ditunjukkan oleh paduan Mg-29Zn-1Ca dan Mg-53Zn-4Ca dengan waktu tahan lima jam. Oleh karena itu, waktu tahan sintering yang optimum adalah lima jam untuk menghasilkan paduan Mg-Zn-Ca untuk material implan.
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