Araka ny fantatsika rehetra, ny fandrosoana mitohy amin’ny fitaovana elektronika sy ny haitao mihodina, ny tampon’ny kanto injeniera amin’ny famolavolana, ny fampandrosoana ary ny fanamboarana ny pirinty boribory pirinty (PCB) dia efa hitan’ny olona eran’izao tontolo izao. Our planet is full of highly intelligent machines, automated robots and scientific marvels, and of course, there are plenty of PCBS in every corner of the planet, no matter what country or city it is. Saingy, ireo PCBS ireo dia samy hafa amin’ny fomba fiasa, ny fahasarotana, ny vidin’ny fanamboarana, ny kalitao ary ny fahamendrehana. Ity lahatsoratra ity dia mifantoka amin’ny teboka roa farany, ny kalitao sy ny fahamendrehana an’ny PCBS.

Eny, ny mpanjifa mety dia maniry elektronika avo lenta foana, saingy lafo io ary mety misy dingan’ny famokarana sarotra. Ao anatin’ny dingana sarotra amin’ny famokarana PCB, fivoriambe ary fanandramana, dia misy dingana iray tena lehibe antsoina hoe “coating conformal” an’ny PCB. Ity pataloha mifanaraka ity dia tena zava-dehibe amin’ny PCBS amin’ny kalitao sy ny fahamendrehana.

Inona no atao hoe firakotra mifanaraka sy ny maha-zava-dehibe azy:

Conforming coating, an ultra-thin protective coating of polymer film, can be used in conjunction with assemblies mounted on assembly surfaces to protect assembly leads, solder joints, exposed wiring, and other metal points on the PCB surface from corrosion, dust, or chemicals due to various operating or environmental conditions.

Ny firakotra mifanaraka dia mety ho manify toy ny 25 microns ary “mifanaraka” amin’ny endrika sy ny endriny ao amin’ny tabilao mihodina. Araka ny efa voalaza tetsy ambony, ny antony mampisy takelaka mifanaraka amin’ny ambonin’ny (ambony sy ambany) an’ny PCB dia ny fiarovana ny PCB amin’ny toe-piainana ratsy any ivelany, ka hampiakarana ny androm-piainan’ny PCB sy ireo fitaovana elektronika mifandraika amin’izany.

Toy ny mari-pana avo lenta hita amin’ny indostrialy, ozinina ary elektronika mahery vaika, ireo PCBS misy palitao mifanaraka ireo dia mahazaka hafanana be. Toy izany koa, fitaovana elektronika napetraka amin’ny faritra / faritra manakaiky ny ranomasina na ny ranomasina dia mety ho voan’ny hamandoana avo, toy ny fitaovam-pitaterana an-dranomasina elektronika mety iharan’ny harafesina / fikajiana izay mety hitarika amin’ny fitrandrahana vy. Similarly, in microbiology laboratories and the medical industry, sensitive electronic equipment can be exposed to toxic chemicals, acidic and alkaline solvents that can accidentally spill onto a PCB, but the PCB’s “conformation coating” will protect the PCB and components from fatal injury.

Ahoana ny fomba fampiharana ny rindrina mifanaraka amin’izany?

In fact, the method of applying “conformal paint” in the right way is so important that careful consideration must be given to how conformal paint is applied. It is as important to choose suitable conformal coating materials.

Ny antony lehibe mamaritra ny fampiharana tsara ny coatings mifanaraka dia:

1- Hatevina loko

2- The level of coverage achieved

3- The degree of adhesion of paint to wood panels and their components.

There are five methods for applying conformal coatings:

1- Doko amin’ny borosy amin’ny tanana

2- Fonosana Aerosol

3- Atomizing spray gun coating

4- Automatic dip coating

5- Automatic selection of coating

Fomba fanasitranana / fanamainana manarona ny rindrambaiko mifanaraka amin’izany:

Conformal coatings themselves can be classified according to the drying and curing methods used after conformal coatings are completed. These methods are:

1- Heat/heat curing: Conformal coating is dried at high temperature. Drying rate is much faster than normal room temperature drying/curing.

2- Fanasitranana ny fanonerana: ny firakotra mifanaraka amin’ny PCB dia maina amin’ny maripana manodidina, ny hamandoana amin’ny atmosfera mampiadana ny fizotran’ny fanasitranana na fanamainana.

3- ULTRAVIOLET (UV) curing: Here PCB with conformal coating is exposed to UV radiation. The uv energy determines the curing speed of PCB conformal coating

4 – Fanasitranana oksidana: Amin’ity fomba ity, ireo mpifanaraka amin’ny PCB dia iharan’ny tontolo iainana misokatra miaraka amin’ny oksizenina atmosfera marobe, izay hanampy amin’ny fanamainana / fanasitranana ireo mpifanaraka amin’ny solvent.

5- Catalytic curing: This is the process of curing conformal coating in which two materials are fused together, one of which is conformal coating. Raha vantany vao ampifangaroina amin’ny fitaovana catalyst hafa ny firakotra, ny fizotran’ny fanasitranana dia tsy azo ajanona raha tsy vita.

Classification of conformal coatings:

There are five main conformal coatings used: acrylic resin, epoxy resin, silicone, polyurethane (PU) and polyparaxylene coating.

L acrylic resin (AAR):

Acrylics are ideal for (low-cost and high-volume) common electronics because AAR is inexpensive and can be easily applied to PCB surfaces by brush, dip, and manual or automatic spraying, reducing turnaround time and producing cost-effective products.

soa:

1 – vidiny ambany

2- Mora amin’ny fampiharana robot na manual

3- Easy to rework

4 – Fiarovana hamandoana tsara

5- Good surface elasticity, can withstand static voltage discharge, and does not react with the atmosphere, therefore helps cure through solvent evaporation

fatiantoka:

1- Due to the use of atmospheric curing/drying methods for this material, proper ventilation systems need to be ensured

2- Fikolokoloana viscosity ambany

3- fanoherana ambany akanjo sy fanoherana simika

L Epoxy conformal coating (ER) :

Ny firakotra mifanaraka amin’ny resin epoxy dia azo tanterahina amin’ny alàlan’ny borosy tanana, tsiranoka na pataloha. Ny famafazana dia asaina ho an’ny volume lehibe kokoa ary ho an’ny volume kely na prototype PCBS.

soa:

1- High moisture resistance and good dielectric resistance

2- Excellent chemical resistance, abrasion resistance, moisture resistance and high temperatures up to 150 O C

fatiantoka:

1-epoxy conformal paint is very hard and rigid and can damage PCB and its components if attempted peeling or removal. Esory ny fonosana amin’ny alàlan’ny fampiasana solvent mampidi-doza

2- Fahombiazana amin’ny mari-pana ambany

3- Mihena ny fihenan’ny hafanana

4- Sarotra ny mamerina azy ireo

L Silicone résin (OSR) mifono endrika:

The softest of the above two types of conformal coatings is silicone resin (OSR) conformal coatings. They are widely used in LED lamp PCBS without reducing light intensity or color change. Ideal for PCB installation at high humidity and exposure to air. Suitable for PCB with high operating temperature and high power

soa:

1- Fanoherana simika tsara, fanoherana ny hamandoana, famafazana sira ary hafanana avo hatramin’ny 200 OC

2- Ny fahafaha-manao tsara dia mahatonga azy io mahatohitra ny fihenjanana amin’ny PCB avy amin’ny tontolo ivelany.

3- Mety amin’ny fampiharana ivelany PCB misy hamandoana avo

Ny ratsy:

1- Tsy mitafy mahatohitra noho ny fananana vita amin’ny fingotra

2- Azo averina amboarina, fa tsy mora, mitaky solventsa manokana, fotoana mandemana lava ary mikorontana toy ny borosy na fandroana ultrasonic

3- Low mechanical strength, weak adhesion to PCB substrate

L Polyurethane (PU) firakotra mifanaraka:

Mety amin’ny fampiharana PCB amin’ny fiara, indostrialy, fitaovana ary fifandraisan-davitra. Amin’ny aerospace, indrindra indrindra, ny etona solika dia mifandona amin’ny vatan’ny fitaovana elektronika ary miditra ao anatiny ary misy fiantraikany amin’ny tabilao PCB

soa:

1- High resistance to moisture, chemicals (acid and alkali) and wear

fatiantoka:

1- Taorian’ny fotoana maharitra nandritra ny fanasitranana tanteraka, dia mazàna mivadika mavo amin’ny hafanana avo noho ny atiny VOC avo

2- Toy ny silikone, tsy mora ny manala tanteraka

L polyparaxylene conformal coating:

This type of coating is suitable for avionics, microelectronics, sensors, high-frequency circuits, and densely populated PCB-based components. It is applied by means of vapor deposition.

soa:

1- Excellent dielectric strength

2- High resistance to moisture, solvents, extreme temperatures and acid corrosion

3- Can be applied evenly with very thin paint.

fatiantoka:

1- Tena sarotra ny fanaparitahana / fanamboarana

2- Ny vidiny lafo no fihemorana lehibe indrindra.