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Curing the coating Inspecting under UV light to verify complete coverage and touch-up Removing mask materials

Cure Each of the four liquid chemistries is available in a formulation offering different cure mechanisms, as shown in Table 411 41511 Solvent Evaporation Systems that are cured by solvent evaporation can be air dried, or slightly heated to drive the solvent out faster Care must be taken not to overheat the freshly coated assemblies; the coating will skin over and cause bubbles Long-term exposure to the unevaporated solvents trapped in the coating may also be deleterious to the materials in the parts and PWB Drying of solvent cure assemblies must be done under a ventilation hood or other properly ventilated area 41512 Room Temperature Vulcanization (RTV) Some silicone-based coatings use the room temperature vulcanization (RTV) cure process, which consumes moisture from the surrounding environment as part of the cure process.

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Some means of humidity control is required; if cure is attempted in a dry oven, the material will not cure properly, if at all 41513 Heat Cure Oven-curable systems use an extended bake, ranging from 15 min to several hours or longer, for the material to cure fully Thermally activated systems require the increased temperature to start the curing process, whereas thermally accelerated systems will cure eventually at room temperature but are baked to speed up the process and improve material properties Generally, the hotter the oven, the quicker the cure, and the harder the finished material 41514 UV Cure For high-volume production, UV-curable materials are used Immediately after the coating machine is a booth with high-intensity ultraviolet lamps to illuminate the assembly.

After several seconds, the assembly has cured enough to be able to be handled at the next stage of assembly, such as coating the opposite side UV-curable materials do not cure fully under components, where the coating is not illuminatedTherefore, most UV-curable materials also contain a secondary curing mechanism, such as heat cure, so that at the end of the line the CCA can be fully cured in a single baking step or naturally come to full cure in ambient conditions inside the finished product Since different coatings are sensitive to different wavelengths of UV light, it is important to coordinate the purchase of the light source with the supplier of the coating..

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41.5.1.5 Catalyzed. The catalyzed process involves mixing two parts together just before application, to initiate polymerization and cross-linking. This process occurs slowly at room temperature but may be accelerated by elevating the temperature in an oven. Catalyzed coatings may be affected by contaminants present in the PWB or parts being coated, resulting in uncured areas or peeling coatings. Since the pot life of catalyzed materials tends to be short, it is imperative that the mixed material be cleaned from sprayers, tubing, and so on, before it thickens and hardens. 41.5.2 UV Inspection Coatings contain a fluorescent dye that will glow under UV light and show where the coating has (or has not) been applied. Areas without coating can be touched up at this time. The areas most susceptible to insufficient coating are corners of parts, where the coating can flow away and leave little behind; the protruding ends of through-hole part leads; and shadowed areas under or behind larger components. If large flat areas are uncoated and show beads of coating, there is a wetting problem due to improper surface preparation or a material incompatibility. The coating should also be inspected for improper thickness, bubbles, trapped material or debris, and incomplete curing (see Fig. 41.6).

The program rc_calib.asm in the code directory was used to measure the frequency of the output waveform generated on the PORTB pins. This frequency was then used to calculate the internal clock frequency of the processor.

FIGURE 41.6 Various conformal coating defects. (a) Coating on connector pins (b) Cracked or crazed coating (c) Delaminated or blistered (d) Uncoated areas (e) Excess coating drips and runs (f) Excess coating bridging flat pack leads (g) Solvent runoff from rework affecting surrounding coating (h) Overheated, burned coating from rework (i) No buffer coating applied to Glass parts when used with hard coating at cold (j) Dewetting; coating beading up instead of wetting to board (k) Excess coating interfering with movable items (l) Excess coating in masked areas (m) Excess bubbles from trapped solvents (n) Insufficient coverage on corners and edges (o) No coating applied under parts (p) Uncured coating under parts.

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