SMT007 Magazine

SMT-Apr2014

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April 2014 • SMT Magazine 63 Figure 14: iPc 2.6.3.7 Sir test (paste material coated with conformal coating). figure 15: Comb pattern with dendrites. figure 16: black light/good adhesion. CONFOrMal COaTiNG OvEr NO-ClEaN FlUX continues fEATurE compared to the 85°C/ 85Rh. Figure 15 shows a comb pattern that was run at 85°C/85Rh. The dendrites are starting to grow. Adhesion to board and flux residues can also be determined by using a crosshatch cut and applying tape to check adhesion as shown in Figures 16 and 17. Conclusion This article is a consolidation of hundreds of tests and material combinations. The matrix of residues and available coatings would be too large to contemplate. The data has been edited to present key findings of collected informa- tion and provide practical guidance for engi- neers considering deploying this technique for their assemblies. Based on our findings, we have concluded that conformal coatings can safely be used over no-clean flux chemistry for many types of as- semblies. It is imperative that compatibility

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