(南昌大學(xué) 材料科學(xué)與工程學(xué)院，南昌 330031)
摘 要: 制備不同Zn含量的Sn-Zn系合金粉末，分別在室溫和120 ℃下進(jìn)行合金氧化實(shí)驗(yàn)，用質(zhì)量增加測量法考察合金氧化動(dòng)力學(xué)行為，用XRD檢測氧化產(chǎn)物的物相，并測量向熔融松香中加入不同量的ZnO時(shí)體系的黏度隨時(shí)間的變化。結(jié)果表明：固態(tài)Sn-Zn合金的氧化產(chǎn)物為SnO2和ZnO，并呈現(xiàn)致密氧化膜的特征；Sn-Zn合金的氧化速率隨著Zn含量的增加而加快。過量的ZnO可使松香發(fā)生稠化。根據(jù)以上結(jié)果提出，在釬焊過程中ZnO導(dǎo)致的使松香助焊劑局部稠化失效以及包覆熔體表面的ZnO膜的機(jī)械阻礙作用是Sn-Zn系無鉛焊料潤濕性差的主要 原因。
關(guān)鍵字: Sn-Zn合金；無鉛焊料；氧化；潤濕性
（School of Materials Science and Engineering, Nanchang University, Nanchang 330031, China）
Abstract:Powders of Sn-Zn alloys with different Zn contents were prepared. Oxidation behaviors of the powders at room temperature and at 120 ℃ were investigated by means of weight-gaining and XRD. The results show that SnO2 and ZnO with characteristic of dense oxide films are formed during oxidation of Sn-Zn alloys, and that oxidation of Sn-Zn alloys is accelerated with increasing Zn content. Furthermore, ZnO can thicken the rosin. It is proposed that the mechanical impediment to the spreading of the molten alloy, resulted from the cladding effect of ZnO, and the local thickening of rosin based flux by ZnO, result in the poor wettability of Sn-Zn lead-solders.
Key words: Sn-Zn alloys; lead-free solder; oxidation; wettability
