Investigation of the effect of nitrogen and air atmospheres on solder wettability of plasma-treated HASL finish PCBs
Takyi, G. and Ekere, N.N. (2010) Investigation of the effect of nitrogen and air atmospheres on solder wettability of plasma-treated HASL finish PCBs. Soldering and Surface Mount Technology, 22 (3). pp. 17-21. ISSN 0954 0911 (doi:10.1108/09540911011054154)Full text not available from this repository.
Purpose – The purpose of this paper is to evaluate the effect of nitrogen and air atmospheres on the solderability testing of plasma-treated hot air solder level (HASL) finish printed circuit boards (PCBs). Design/methodology/approach – In this paper, the soldering performance of plasma-treated HASL finish PCBs in nitrogen and air atmospheres have been evaluated using the wetting balance technique. The results were compared with the performance of conventionally flux-treated samples soldered in air and nitrogen atmospheres and non-flux treated samples soldered in air. Auger chemical analysis results were also compared with the solderability test results in order to obtain a complete profile of the plasma-treated and non-treated surfaces. Findings – The results of the auger chemical analysis show high organic (carbon) levels in the control samples and a significant drop in organic levels in the plasma-treated samples. The significant drop in the level of carbon leads to a decrease in contact angle and an increase in both surface energy and solder wettability. The results indicate that plasma cleaning of PCBs prior to soldering is a viable alternative to the conventional use of flux. Originality/value – The paper indicates that the soldering performance of plasma-treated PCBs in air and nitrogen atmosphere are comparable. The findings give the motivation for the use of plasma-assisted dry cleaning for fluxless soldering.
|Uncontrolled Keywords:||plasma-treated hot air solder level (HASL), printed circuit boards (PCBs), auger chemical analysis|
|Subjects:||T Technology > TA Engineering (General). Civil engineering (General)|
T Technology > TK Electrical engineering. Electronics Nuclear engineering
|School / Department / Research Groups:||School of Engineering|
|Last Modified:||29 Feb 2012 16:27|
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