Three ways of PCBA coating_
Multilayer PCB DFM Tips
BGA rework process
Save PCB manufacturing cost at design stage
Three ways of PCBA coating
Surface mount assembly growing fast
FPCB specification
V-CUT Design &DFM
Via types in PCB
PCBA preservation and shelf life
Ways to avoid solder beading during SMT process
5 ways to choose a PCBA package manufacturer
The original data of SMT placement machine programming
3types of SMT stencil production process
Green or black Soldermask?
Four methods to do PCB outline
Common factors affect PCB price
FR1, FR2, FR3, FR4 material
Do you accept X-out board?
PCBA testing
Main material of Flex PCB
Mill PCB bare board by yourself
Turn an idea into a new product-PCB prototype
Copper weight VS Line/Space
Basic knowledge of Gerber format
Introduction of Aluminum copper clad
PCB laminate choose for M2M designs
Four features to consider in PCB layout
Difference between THT and SMT
AT & S investing in Chongqing PCB plant
High layer board manufacturing difficulties
Halogen-Free requirements
5 ways to choose a PCBA package manufacturer
IPC-9121-PCB manufacturing process troubleshooting
Through hole immersion soldering process
PCBA conformal coating process steps
Pseudo soldering inspection and control plan
Tips in Board edge design- routing &V-cut
Industrial robots advantages in the PCB industry
ENEPIG surface treatment
Grade of FR4 CCL
SMT Machine for LED beads
Choose a right PCB assembler
Factors affect CCL quality
PCB structure and development
PCB price calculation description
How to prevent bow and twist during reflow oven process?
Broader range of PCB applications
China PCB industry’s new challenge
LED industry promotion in Guangdong province
10 important features of high reliability circuit boards
Germany PCB plant Enzmann close its small batch PCB plant
PCB glossary T-Z
PCB glossary R-S
PCB glossary M-P
PCB glossary G-L
How is the cost of SMT price calculated
Detailed processing flow of PCBA manufacturing
PCB glossary D-F
PCB glossary A-C
Japanese PCB industry in 2015
Common mistakes in PCBA files
Catching DFM problems during PCB design
Configuration requirements of SMT line
Why is green color soldermask common?
Few PCB Design tips
Use HDI technology to produce smaller PCB
PCBA sample manufacturing procedures
The relationship and difference between EMS and PCBA
The meaning of layers in PCB
Is PCBA Manufacturing fee a standard for judge electronic manufacturing factories
How to DIY PCB and soldering
Long-time storage components may cause cold soldering during SMT
Vias treatment in PCB manufacturing
Counterbore and Countersink Hole in PCB
Four factors affect Rigid PCB price
Control of FPC SMT
Difference between ENIG and plating gold PCB
Factors that affect prototype PCB price
Why is SMT technology so popular
3 Methods of DIY PCB
Tips of components Placement on PCB design
Tips of PCB Layout
Peelable solder mask PCB manufacturing
PCBA aging test specifications of SYS Tech
defect of PCBA manufacturing
Tips of Schematic design
PCB Silkscreen layer introduction

Three ways of PCBA coating

Electronic circuit board components as the core of PCBA, should have good resistance to environmental adaptability and electrical parameters. Conformal coating is the process of spraying a dielectric material onto a device component to protect it from moisture, fungus, dust, corrosion, abrasion, and other environmental stresses.
Three normal ways to do conformal coating process
1. Brush coating works by flow coating the material onto the board and is suitable for low volume application, finishing and repair. The finish tends to be inferior cosmetically and can be subject to many defects such as bubbles. The coating also tends to be thicker and unless skilled operators used the coating, highly subjective in quality. And in this way you can add some fluorescent material to your coating liquid and when you work under a fluorescent lamp you can easily to find out which area or space is not covered the coating.
2. Spray application coating can be completed with a spray aerosol or dedicated spray booth with spray gun and is suitable for low and medium volume processing. The quality of the surface finish can be superior to all other methods when a trained skilled operator completes ,the process, as long as the circuit board is clean and the coating has no adhesion issues. The coating application may be limited due to 3D effects but masking requirements are more “shield” than “barrier” since the penetration is less effective. However, the lack of penetration can be an issue where coating is desired to penetrate under devices.
3. Conformal coating dipping is a highly repeatable process and if the PCB is designed correctly can be the highest volume technique. Coating penetrates everywhere, including under devices, and therefore any masking must be perfect to prevent leakage. Therefore, many PCBs are completely unsuitable for dipping due to design. The issue of “thin tip coverage” where the material slumps around sharp edges can be a problem especially in a highly condensing atmosphere. This tip coverage effect can be eliminated by double dipping the PCB, using several thin layers of anatomist spraying to achieve good coverage without exceeding coating thickness recommendations or a combination of the two techniques.
Moisture + dust + salt spray is an important factor in PCBA failure. Electronic circuit board components coated with three anti (anti-salt spray, anti-heat, anti-mold) paint can withstand the impact of harsh environments on the circuit and components, increase the mechanical strength and reliability, to prevent sudden changes in temperature caused by condensation Wire leakage between the short circuit and even breakdown, for working in high voltage and low pressure conditions of the printed circuit board can improve the wire between the creepage, breakdown phenomenon, thereby enhancing the reliability of the product.