Effects of Zn and A1 on corrosion characteristics of Sn-1.0Ag-0.5Cu alloys / Nurul Liyana Kamaruzaman
In the past few years, tin-lead (Sn-Pb) solder alloys had been popularly used in the electronic industries especially in packaging. However, lead and lead containing alloys have been banned because of environmental and health concerns. Recently, efforts are being made to develop a usable lead-fre...
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| Format: | Thesis |
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2018
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| Online Access: | http://studentsrepo.um.edu.my/9156/ http://studentsrepo.um.edu.my/9156/1/Nurul_Liyana_Binti_Kamaruzaman.jpg http://studentsrepo.um.edu.my/9156/11/liyana.pdf |
| Summary: | In the past few years, tin-lead (Sn-Pb) solder alloys had been popularly used in the
electronic industries especially in packaging. However, lead and lead containing alloys
have been banned because of environmental and health concerns. Recently, efforts are
being made to develop a usable lead-free solder to substitute tin-lead based solder
alloys. Comparing to other solders, tin-silver-copper (Sn-Ag-Cu) free solder alloys seem
to be the best alternative to replace traditional lead-tin based solder alloys. In the present
study, the corrosion characteristics of lead-free solder alloys such as Sn-1.0Ag-0.5Cu-
XZn (X= 0, 0.1, 0.5. 1.0) and Sn-1.0Ag-0.5Cu-XAl (X=0, 0.1, 0.5, 1.0) have been
investigated in 3.5wt-% NaCl solution. The corrosion behavior of were studied through
Polarization curve and the Electrochemical Impedance Spectroscopy (EIS) by using
Gamry Echem Analyst DC105 software. The microstructure and element of the
corrosion compounds formed on the surface of lead-free solder alloys were investigated
by Scanning Electron Microscopy (SEM), Energy-dispersive X-ray Spectroscopy
(EDX), and X-ray Diffraction (XRD). The polarization curves showed that the addition
of Zn in SAC105 solder alloy increased the corrosion current density and shifted the
corrosion potential towards more negative values. As a result, the corrosion resistance
of Sn-1.0Ag-0.5Cu-XZn alloys reduces with the increase of Zn concentration. The EIS
results agreed well with the findings obtained from polarization curves. The corrosion
products at the surface of the investigated Zn doped alloys constituted of Sn3O(OH)2Cl2,
SnO, SnO2 and ZnO. Like Zn, addition of Al also decreases the corrosion resistance of
the SAC 105 solder alloy |
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