Corrosion Behavior in Salt Solution and High Temperature Oxidation for Active Solders

• Main Authors: Chao-Kai Lin, 林照凱
• Other Authors: Shih-Ying Chang
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/10145903132752628227

碩士 === 國立雲林科技大學 === 機械工程系碩士班 === 100 === The effect of various active solders on the behavior of salt water corrosion and high temperature oxidation was investigated. Six different solders, Sn-8Zn-3Bi, Sn-8Zn-3In, Sn-8Zn-1.5Bi-1.5In, and Ti and rare earth elements containing solders, Sn-8Zn-3Bi-4Ti-0.1Re, Sn-8Zn-3In-4Ti-0.1Re, and Sn-8Zn-1.5Bi-1.5In-4Ti-0.1Re were used in this study. The solders containing Ti and rare earth elements showed a high corrosion potential in salt solution. The solders, which contained Ti and rare earth elements, had also a high corrosion current density. The initial corrosion rate of the solders containing Ti and rare earth elements was high. However, the corrosion resistance of the solders was better than the solders without Ti and rare earth elements. The formation of the oxide layers on the six solders was not obvious at the initial stage for high temperature oxidation. After 1344 hours high temperature oxidation at 200℃, the oxide layers on the solders containing Ti and rare earth elements were uniform. At high temperature, Zn reacted with Ti to form ZnTi in the Sn-Zn solders containing Ti and rare earth elements. That caused the reduction of the ZnO after long period exposure to air at high temperature.