Sains Malaysiana 46(2)(2017): 295–302
http://dx.doi.org/10.17576/jsm-2017-4602-14
Electrochemical
Corrosion Behaviour of Pb-free SAC 105
and SAC 305 Solder Alloys: A Comparative
Study
(Perilaku
Kakisan Elektrokimia Aloi Pateri Pb-free SAC 105 dan SAC 305:
Suatu Kajian Perbandingan)
M. FAYEKA,
A.S.M.A.
HASEEB
& M.A. FAZAL*
Department of Mechanical Engineering, University of Malaya,
50603 Kuala Lumpur, Federal Territory, Malaysia
Received: 17 September 2015/Accepted: 24 May 2016
ABSTRACT
Sn-Ag based solder alloy seems to be a promising lead-free solder
for the application on electronic assembly. The corrosion behavior
of different lead free solder alloys such as Sn-3.0Ag, Sn-1.0Ag-0.5Cu
and Sn-3.0Ag-0.5Cu was investigated in 3.5% NaCl solution by potentiodynamic
polarization and electrochemical impedance spectroscopy. Scanning
electron microscopy (SEM),
energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD)
were used to characterize the samples after the tests. The results
showed that the addition of 0.5 wt. % copper with Sn-3.0 Ag solder
alloy led to a better corrosion resistance while lowering of Ag
content from 3.0 to 1.0 wt. % decreased the resistance. Sn-3.0Ag-0.5Cu
exhibits a better corrosion resistance in terms of increased charge
transfer resistance and impedance values as well as the lowest
capacitance. These characteristics signify its suitability for
the application in electronic packaging.
Keywords: Corrosion; EIS; Pb-free solders; potentiodynamic
polarization
ABSTRAK
Aloi pateri berasaskan Sn-Ag berpotensi menjadi
pateri bebas-Pb untuk diaplikasikan sebagai pemasangan elektronik. Tindak balas kakisan aloi pateri bebas Pb yang
berbeza seperti Sn-3.0Ag, Sn-1.0Ag-0.5Cu dan Sn-3.0Ag-0.5Cu dikaji
dalam larutan 3.5% NaCl menggunakan upaya dinamik pengutuban dan
spektroskopi impedans elektrokimia. Mikroskop imbasan elektron
(SEM),
spektroskopi sinar-X tenaga terserak (EDX) dan pembelauan sinar-X (XRD)
telah digunakan untuk mencirikan sampel selepas ujian. Hasil
kajian menunjukkan bahawa penambahan 0.5 %. bt
tembaga ke dalam aloi pateri Sn-3.0Ag menghasilkan rintangan kakisan
yang lebih baik. Manakala mengurangkan kandungan
Ag daripada 3.0 kepada 1.0 %. bt,
menurunkan rintangan. Sn-3.0Ag-0.5Cu menunjukkan kakisan yang
lebih baik daripada segi peningkatan pemindahan cas rintangan dan nilai impedansi. Ia
juga mempunyai kapasitans yang paling rendah. Ciri-ciri
ini mencerminkan kesesuaian bahan ini dalam aplikasi pembungkusan
elektronik.
Kata kunci: EIS;
kakisan; pateri bebas Pb; upaya dinamik pengutuban
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*Pengarang
untuk surat-menyurat; email: fazal@um.edu.my