2.4.1 Coating Replacement, Solder Mask
|
-
This method is used to replace solder mask or coatings on circuit boards. Most replacement coatings can be applied by dipping, brushing or spraying.
-
If needed, apply tape to outline the area where the solder mask will be applied.
-
Apply the replacement coating to the board surface as required. A brush or foam swab may be used to apply and spread the epoxy or replacement coating.
|
Outline
This method is used to replace solder mask or coatings on circuit boards. Most replacement coatings can be applied by dipping, brushing or spraying.
Minimum Skill Level - Intermediate
Recommended for technicians with skills in basic soldering and component rework, but may be inexperienced in general repair/rework procedures.
Conformance Level - High
This procedure most closely duplicates the physical characteristics of the original, and most probably complies with all the functional, environmental and serviceability factors.
Acceptability References
| IPC-A-600 2.0 |
Externally Observable Characteristics |
| IPC-A-610 10.0 |
Laminate Conditions |
|
|
|
| Tools and Materials
|
|
|
Alcohol Swab
Self-saturating Isopropyl alcohol swab. Squeeze handle to release alcohol.
|
|
|
Cleaning Brushes
Disposable brushes for use with solvents for cleaning and application of coatings.
|
|
|
Foam Swab
Ideal for absorbing cleaning solvents, and applying color agents and epoxies.
|
|
|
Images and Figures
|
|
| Soldermask Required At Outlined Area |
|
|
| Figure 1: For large surfaces, apply the replacement coating with a foam swab to create a texture. |
|
Procedure
- Clean the area.
Caution
Surfaces to be coated must be thoroughly cleaned prior to coating to ensure adequate adhesion, minimized corrosion, and optimized electrical properties.
- If needed, apply High Temperature Tape to outline the area where the solder mask will be applied.
- Mix the epoxy or replacement coating. If desired, add color agent to the mixed epoxy to match the circuit board color.
- Apply the replacement coating to the board surface as required. A brush or foam swab may be used to apply and spread the epoxy or replacement coating. (See Figure 1)
- Cure the epoxy per Procedure 2.7 Epoxy Mixing and Handling.
Caution
Some components may be sensitive to high temperature.
Evaluation
- Visual examination for texture, color match, adhesion and coverage
- Electrical tests to conductors around the repaired area as applicable.
|
|
Procedure for reference only.
|
| |
Related Products
115-1322 Circuit Bond Kit
Kit containing packages of clear, low viscosity, superior strength epoxy for circuit board damage repair.
Color Agents
One part, air-drying, semi-paste ink for printing on hard surfaces and used to tint the color of epoxy.
|
|
Customer Comments
"Thanks for you and your recent work on my circuit board. When I slipped the board out of the box I was amazed at how meticulously it had been restored. And once the components were re-installed, it worked like a charm. I'll be recommending your services highly."
J.T. Austin, TX USA
|
|
|
|
|
|
|
 |
Circuit Technology Center has been an IPC member since 1986
|
|
 |
| First-aid Kits for Circuit Boards ® |
|
|
|
