Flux residue

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Additional test substrates were prepared to also take the electrical cleanliness levels into flux residue account. Solder paste and flux were applied on the standard comb structures before glass coupons were placed over the patterns and soldered.

Cleaning agents used Solvent-based cleaning agent and Water-based MPC cleaning agent^. Processes used: Immersion assisted by ultrasonic cleaning. Pressurized Hydrex spray under immersion cleaning. Spray in air assisted batch cleaning. High-pressure spray-in-air in-line cleaning. One-chamber solvent-based cleaning. Centrifugal based cleaning HFE-Co-solvent, Immersion assisted SmartSonic by ultrasonic cleaning. Spray in air stencil-cleaning equipment based cleaning. The cleaning agent and processes were combined flux cleaning based flux residue on process figure 6 feasibility. This guaranteed that the product characteristic (i.e. process temperature) and process flux residue specific (i.e. mechanical agitation) parameters were taken into account. The criteria flux remover used for evaluating the results obtained were based on optical, ionic, as well as electrical cleanliness.

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An RMA flux-containing paste flux residue  was chosen, which would be removable under identical mechanical assistance (Ultrasonic immersion process) with all cleaning agents used during this study. The reference standoff height in this selection flux remover SmartSonic process was 0.004 flux cleaning  inches (4MIL). The authors felt, that this would offset any effect that different cleaning media might have on the outcome of this study.

• The optical inspection was performed via Microscope SZ40 (Olympus, 40X magnification). This test method is in accordance with IPC standard 610A.
• The ionic contamination measurements were performed with a 75% IPA/25% water mixture (CM11/(Multicore)), which was in conformance flux residue  with IPC test method 650. The glass coupon geometries and surfaces were not part of the surface area Hydrex determination. The measured values for the ionic contamination can be seen as benchmark values. Three to five measurements for identical components were necessary to determine statistically meaningful values. For a measured SmartSonic surface flux cleaning area of 12 by 10 inches the accuracy and reproducibility was found to have a standard error of less than ± 2%. This evaluation was in accordance with J-STD 001C.
• The electrical cleanliness was performed based on SIR tests according to J-STD 001. Climatic storage was performed in a climatic flux remover Hydrex exposure test cabinet “Temperature & Humidity ChamberPL-2K”, Espec Ltd.

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