High-temperature corrosion of Sn-Bi-Zn-Ga alloys as heat transfer fluid

• 作者: Qing-Meng Wang Xiao-Min Cheng Yuan-Yuan Li Guo-Ming Yu Zhi Liu
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2021,（8）
• 所属期刊栏目: ORIGINAL ARTICLES
• 页码范围: 2221-2229
• 页数: 9页
• 语种: 英文

摘要

The new heat transfer alloy is highly reactive at high temperatures,and the corrosion of the container mate-rial determines the service life of the heat transfer system.The high-temperature corrosion of Sn-Bi-Zn-Ga alloys as heat transfer fluid was investigated.The microstructure and elemental distribution were studied by field emission scan-ning electron microscopy (FESEM) and energy dispersive spectroscopy (EDS).The thermal properties before and after corrosion were studied by differential scanning calo.rimetry(DSC).The results show that the corrosion kinetics of the studied materials follows the parabolic law and the thermal properties after corrosion are improved.Ga significantly improves the thermal conductivity.316 stainless steel exhi-bits excellent corrosion resistance due to its high Cr and Ni contents.Corrosion mechanism analysis shows that the oxidation of Ga has a smaller Gibbs free energy,and an oxide forms at the corrosion interface to prevent dissolution cor-rosion and oxidative corrosion of the container material.