Studies on Properties and Structure of Electroless Plating Tin Coating
来源期刊：材料保护2004年增刊第2期
论文作者：XU Rui-dong ZHU Xiao-yun GUO Zhong-cheng
关键词：electroless tin coating; porosity; solderability; structure;
摘 要：The composition and structure of electroless tin coating were analyzed by SEM and X-ray diffraction. In the meantime, porosity, solderability and extensibility were determined by physical and chemical methods. The results showed that the porosity of the tin coating increases with the rise of bath temperature and decreases as the plating time rises. Solderability is improved with the rise of thickness of tin coating, and decreases when the tin deposit is heated at 180 ～ 200 ℃. The crystalline grain size becomes bigger and bigger with increasing plating time or bath temperature or coating thickness. X-ray diffraction indicates that only Cu and β-Sn phases show up in the diffraction patterns. Tin coating has a strong joint force with copper substrate and excellent function of electrochemical protection as anode coating.
XU Rui-dong1，ZHU Xiao-yun1，GUO Zhong-cheng1
(1.The Centre of New Materials and Surface Engineering Research & Development, Kunming University of Science and Technology, Kunming 650093)
摘要:The composition and structure of electroless tin coating were analyzed by SEM and X-ray diffraction. In the meantime, porosity, solderability and extensibility were determined by physical and chemical methods. The results showed that the porosity of the tin coating increases with the rise of bath temperature and decreases as the plating time rises. Solderability is improved with the rise of thickness of tin coating, and decreases when the tin deposit is heated at 180 ～ 200 ℃. The crystalline grain size becomes bigger and bigger with increasing plating time or bath temperature or coating thickness. X-ray diffraction indicates that only Cu and β-Sn phases show up in the diffraction patterns. Tin coating has a strong joint force with copper substrate and excellent function of electrochemical protection as anode coating.
关键词:electroless tin coating; porosity; solderability; structure;
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