Sains Malaysiana 47(8)(2018): 1867–1872

http://dx.doi.org/10.17576/jsm-2018-4708-27

 

Kelakuan Migrasi Elektrokimia Pateri SAC305 dalam Larutan Natrium Hidroksida pada Kepekatan yang Pelbagai

(Electrochemical Migration Behaviour of SAC305 Solder in Various Concentrations of Sodium Hydroxide Solution)

 

EMEE MARINA SALLEH1, NORINSAN KAMIL OTHMAN1* & AZMAN JALAR2

 

1School of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

 

2Institute of Microengineering and Nanoelectronic (IMEN), Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

 

Received: 5 October 2017/Accepted: 27 April 2018

 

ABSTRAK

Pengecilan saiz antarahubung dalam papan litar bercetak (PCB) membawa kepada migrasi elektrokimia (ECM) dan kemudiannya menyebabkan litar pintas. ECM merupakan salah satu jenis kakisan yang ketara menjejaskan kebolehtahanan kakisan kepada peralatan elektronik. Migrasi ini ialah fenomena ion logam bergerak dari satu kawasan ke kawasan yang lain di dalam medium logam, menyebabkan endapan berlaku di bahagian katod logam ataupun aloi. Justeru, kajian ini dijalankan untuk menentukan kelakuan kakisan melalui ujian titisan air (WDT) pateri bebas plumbum Sn-3.0Ag-0.5Cu (SAC305) di dalam larutan natrium hidroksida (NaOH) yang berbeza kepekatan iaitu 0.05M, 0.1M, 0.5M dan 1.0M. Purata masa-ke-kegagalan (MTTF) pateri SAC305 berkurangan apabila didedahkan kepada medium larutan NaOH yang semakin tinggi kepekatannya. Pembentukan dendrit dikesan selepas kakisan pateri SAC305 akibat proses ECM dan menyebabkan litar pintas. Hasil kakisan Cu(OH)2 dan SnO2 juga didapati terbentuk selepas pateri terkakis. Bopeng kecil kelihatan terbentuk terutamanya pada kepekatan yang tinggi adalah disebabkan oleh perlarutan pada anod Sn.

 

Kata kunci: Bahan pateri Sn-Ag-Cu; kakisan; migrasi elektrokimia; pateri tanpa plumbum; ujian titisan air

ABSTRACT

Miniaturization of the interconnection size in printed circuit board (PCB) leads to electrochemical migration (ECM) causing short circuit. ECM is a form of corrosion which significantly affects the corrosion reliability for most of the electronic equipment. Migration is a phenomenon in which the metallic ions are moving from one region to another region of metal, resulting in metal or alloy deposits at cathodic part. Hence, this study was performed in order to determine corrosion behaviour of SAC305 solder via water drop test (WDT) in various concentration of sodium hydroxide (NaOH) included 0.05M, 0.1M, 0.5M and 1.0M. The results showed that mean time to failure (MTTF) of SAC305 solder reduced when the samples were exposed to higher concentration of NaOH solution. Formation of dendrite was observed after SAC305 solder corroded due to ECM process which resulted in short circuit. Corrosion product such as Cu(OH)2 and SnO2 were formed after the solder was corroded. Tiny pitting was formed especially at high concentration of NaOH which was due to dissolution of Sn anode.

 

Keywords: Corrosion; electrochemical migration; lead free solder; Sn-Ag-Cu solder material; water drop test

 

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  *Corresponding author; email: insan@ukm.my

 

 

 

 

 

 

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