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In this study, the electrochemical corrosion property was measured by increasing Sb contents. The corrosion property of Sn-5Sb, Sn-8Sb, Sn-10Sb, Sn-8Sb-3Ag solder alloys was measured using polarization test. The polarization curves were measured in 3.5 wt. % NaCl solution of 25 ℃. Ag/AgCl and platinum were used by reference electrode and counter electrode, respectively. Corrosion potential (Ecorr), corrosion current density (Icorr) and linear polarization resistance (LPR, Rp) were estimated from the anodic and cathodic tafel lines. SnSb IMC was more diffused in the β-Sn structure by increasing Sb contents. Also, SnSb and Ag3Sn IMC was diffused in the β-Sn structure at Sn-8Sb-3Ag solder alloy. The corrosion potential (Ecorr) and corrosion current density (Icorr) was increased by increasing Sb contents. But, the linear polarization resistance (LPR) was decreased by increasing Sb contents.
