Sains Malaysiana 47(1)(2018): 169–179

http://dx.doi.org/10.17576/jsm-2018-4701-20

Effect of the Poly L-lactic Acid Coating on the Corrosion of Magnesium in Hank's Solution

(Kesan Salutan Acid L-laktik Poli ke atas Pengkakisan Magnesum dalam Larutan Hanks)

ATIKAH WAN NAFI*, AMALINA AFIFI, NOR ISHIDA ZAINAL ABIDIN, NOOR HIDAYAH ABDUL AZIZ & KATAYOON KALANTARI

Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia

Diserahkan: 21 Mac 2017/Diterima: 9 Jun 2017

ABSTRACT

To control the corrosion rate, the Magnesium (Mg) was coated with poly (l-lactic acid) (PLLA) using electrospinning technique. The effectiveness of the PLLA coating on the high purity Magnesium (HP Mg) and alloy AZ91 were tested in Hank's solution immersion test. The corrosion behaviour of Mg coated PLLA was studied through hydrogen evolution, weight loss and scanning electron microscope (SEM) before, during and after samples were immersed. The solution was maintained at pH 7 by bubbling CO₂ gas. The results showed that surface treatment on Mg by coating with PLLA had reduced the rate of corrosion during the immersion test. The PLLA coating was also characterized and the coating adhesion was evaluated.

Keywords: Magnesium; SEM and PLLA coating; weight loss

ABSTRAK

Bagi mengawal kadar kakisan Magnesium; Mg disalut dengan asid (l-laktik) poli; PLLA menggunakan teknik putaran elektron. Keberkesanan PLLA yang membaluti HP Mg dan aloi AZ91 diuji dengan merendam di dalam cecair Hanks. Ciri-ciri kakisan oleh Mg bersalut PLLA dikenal pasti melalui pelepasan hidrogen, penurunan berat dan pengimbas mikroskop elektron (SEM) sebelum, semasa dan selepas sampel direndamkan. Cecair tersebut sentiasa berada pada pH 7 dengan aliran gas CO₂. Keputusan menunjukkan bahawa kaedah rawatan kepada permukaan magnesium dengan disaluti PLLA telah menurunkan kadar kakisan semasa ujian rendaman. Salutan PLLA juga dikenal pasti dan kelekatan balutan juga diuji.

Kata kunci: Magnesium; penurunan berat; SEM dan salutan PLLA

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*Pengarang untuk surat-menyurat; email: Atikah_nafi@yahoo.com