PENGARUH WAKTU PEMANASAN (ANIL) TERHADAP KETAHANAN KOROSI PADA GELAS METALIK BERBASIS ZIRKONIUM
ABSTRACT: The effects of
annealing time on the corrosion resistance of a Zr-based bulk metallic glass
(BMGs) were studied. The Zr 48 Cu 36 Al 8 Ag BMGs annealed at the temperatures
of 471 oC for 0, 23 and 27 min respectively. The partially and fully
crystallized was identified by differential thermal analysis (DSC) and by X-ray
diffraction (XRD). The corrosion resistances of those BMGs was identified by
open circuit potential (OCP), Tafel plot (TP), dan cyclic anodic
potentiodynamic polarization (CAPD). The results show that the as-cast of Zr 8
48 Cu 36 Al BMGs (0 min, full amorphous) has higher corrosion resistance than
that of the annealing specimen for 23 and 27 min, while the fully crystallized
specimen (27 min) has worst corrosion resistance when compared to the other
samples in 0.1 M NaCl solution. The improvement of the corrosion resistance for
as-cast (0 min) is better than annealed specimen (23 and 27 min), because the
as-cast does not have defects like grain boundary (full amorphous). When the
annealing time is longer (27 min), the crystallites grow up (more boundary
regions), therefore increasing the susceptibility to the localized corrosion.
Penulis: Ongki Budi
Anggriawan, Moch. Agus Choiron, Jing Chie Lin
Kode Jurnal: jptmesindd140196
