Effect of polarizations on Sn–Zn solders alloys in alkaline electrolyte

•Sn–9Zn solder was polarized at different scanning rates in 6M KOH.•Dissolution of Zn was found to dominate the initial corrosion reactions of Sn–9Zn.•Lamellar-like grooves were formed resulted from the preferential dissolution of Zn.•Presence of grooves act as weak spots that reduce the ultimate te...

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Veröffentlicht in:Journal of alloys and compounds 2014-09, Vol.606, p.278-287
Hauptverfasser: Nazeri, Muhammad Firdaus Mohd, Ismail, Ahmad Badri, Mohamad, Ahmad Azmin
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container_end_page 287
container_issue
container_start_page 278
container_title Journal of alloys and compounds
container_volume 606
creator Nazeri, Muhammad Firdaus Mohd
Ismail, Ahmad Badri
Mohamad, Ahmad Azmin
description •Sn–9Zn solder was polarized at different scanning rates in 6M KOH.•Dissolution of Zn was found to dominate the initial corrosion reactions of Sn–9Zn.•Lamellar-like grooves were formed resulted from the preferential dissolution of Zn.•Presence of grooves act as weak spots that reduce the ultimate tensile strength. The corrosion properties of Sn–9Zn lead-free solder was studied through potentiodynamic polarization in 6M potassium hydroxide at different scanning rates. The corrosion rates of Sn–9Zn solder remained nearly constant at 2.1×10−4Acm−2 from scan rates of 2.0mVs−1 to 3.5mVs−1 before significantly increasing as the rates increased to higher than 3.5mVs−1. The morphological analysis showed that two distinctive structures of a lamellar-like groove and irregularly shaped corrosion product compounds co-existed on the solder surface after being polarized at different rates. In addition, phase and elemental analyses revealed the formation of mixed corrosion products of SnO, SnO2, and ZnO on the surface after polarization. Moreover, the ultimate tensile stress endured by the solder joint decreased by 26% after polarization.
doi_str_mv 10.1016/j.jallcom.2014.04.034
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source ScienceDirect Journals (5 years ago - present)
subjects Alloys
Applied sciences
Corrosion
Corrosion environments
Corrosion products
Corrosion rate
Durability
Exact sciences and technology
Lamellar structure
Mechanical properties
Metals. Metallurgy
Polarization
Scan rate
Sn–9Zn
Solder
Solders
Tin
Tin base alloys
title Effect of polarizations on Sn–Zn solders alloys in alkaline electrolyte
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