{"id":5003,"date":"2026-06-04T07:52:40","date_gmt":"2026-06-04T07:52:40","guid":{"rendered":"https:\/\/flj-pcb.com\/?p=5003"},"modified":"2026-06-04T07:52:44","modified_gmt":"2026-06-04T07:52:44","slug":"pcba-conformal-coating-guide","status":"publish","type":"post","link":"https:\/\/flj-pcb.com\/bs\/pcba-conformal-coating-guide\/","title":{"rendered":"Vodi\u010d za proces nano\u0161enja konformnog premaza za SMT PCBA"},"content":{"rendered":"

1. Pozadina procesa<\/h2>\n\n\n\n

Kako komponente PCBA postaju sve manje i gu\u0161\u0107e, udaljenost izme\u0111u dijelova i visina odstojnika dijelova, odnosno razmak izme\u0111u dijela i \u0161tampane plo\u010dice, tako\u0111er se smanjuju. Istovremeno, faktori okru\u017eenja imaju sve ve\u0107i i ve\u0107i utjecaj na PCBA<\/a>. Zbog toga elektroni\u010dki proizvodi sada trebaju vi\u0161i nivo pouzdanosti.<\/p>\n\n\n\n

PCBA dijelovi se mijenjaju iz velikih u male i iz rasprostranjenog rasporeda u gust raspored. U trendu miniaturizacije i visoke gusto\u0107e, kvarovi uzrokovani okolinom postaju sve ozbiljniji. Iz tog razloga, konformalno premazivanje postalo je klju\u010dni proces za za\u0161titu pouzdanosti PCBA pri upotrebi.<\/p>\n\n\n\n

2. Utjecaj razli\u010ditih faktora okru\u017eenja na PCBA<\/h2>\n\n\n\n

Uobi\u010dajeni okoli\u0161ni faktori poput vlage, pra\u0161ine, soli u spreju i plijesni mogu uzrokovati razli\u010dite vrste kvarova na PCBA. Glavni u\u010dinci su sljede\u0107i.<\/p>\n\n\n\n

2.1 Utjecaj vla\u017enosti<\/h3>\n\n\n\n

Ve\u0107ina elektroni\u010dkih PCB sklopova koji se koriste u otvorenom okru\u017eenju suo\u010dava se s rizikom od korozije. Voda je glavni medij koji uzrokuje koroziju. Molekule vode su vrlo male, pa mogu pro\u0107i kroz molekularne praznine nekih polimernih materijala i u\u0107i u unutra\u0161njost materijala. Tako\u0111er mogu pro\u0107i kroz mikropore u prevlaci i dospjeti do metalnog sloja ispod, a zatim uzrokovati koroziju.<\/p>\n\n\n\n

Kada zrak dostigne odre\u0111eni nivo vla\u017enosti, mo\u017ee izazvati elektrohemijsku migraciju na \u0161tampanoj plo\u010dici, curenje struje i izobli\u010denje signala u visokofrekventnim kolima.<\/p>\n\n\n\n

Para ili vlaga + ionski zaga\u0111iva\u010di poput soli i aktivatora fluksa = provodni elektrolit + napon stresa = elektrohemijska migracija<\/p>\n\n\n\n

\"Effect<\/figure>\n\n\n\n

Kada relativna vla\u017enost dostigne 80%, na povr\u0161ini ure\u0111aja mo\u017ee se formirati vodeni film debljine od 5 do 20 molekula. U tom trenutku mnoge molekule mogu se slobodno kretati. Ako je prisutan ugljik, mogu se dogoditi elektrohemijske reakcije. Kada relativna vla\u017enost dostigne 60%, na povr\u0161ini ure\u0111aja mo\u017ee se formirati vodeni film debljine 2 do 4 molekule. Ako se u njega otapaju zaga\u0111iva\u010di, mogu se dogoditi hemijske reakcije. Kada je relativna vla\u017enost ni\u017ea od 20%, gotovo sva korozija prestaje.<\/p>\n\n\n\n

Zbog toga je za\u0161tita od vlage va\u017ean dio za\u0161tite proizvoda.<\/p>\n\n\n\n

Za elektroni\u010dku opremu vlaga postoji u tri oblika: ki\u0161nica, kondenzacija i vodena para. Voda je elektrolit. Mo\u017ee otopiti mnoge korozivne ione i potom korodirati metal. Kada je temperatura nekog dijela opreme ni\u017ea od to\u010dke rose, na toj povr\u0161ini nastaje kondenzacija. To se mo\u017ee dogoditi na konstrukcijskim dijelovima ili na PCBAs.<\/p>\n\n\n\n

2.2 Utjecaj pra\u0161ine<\/h3>\n\n\n\n

Pra\u0161ina postoji u zraku. Pra\u0161ina mo\u017ee apsorbovati jonizovana zaga\u0111iva\u010da i potom se talo\u017eiti unutar elektronske opreme. To mo\u017ee uzrokovati kvar. Ovo je \u010dest problem kod vanjske elektronske opreme.<\/p>\n\n\n\n

Pra\u0161ina se mo\u017ee podijeliti na dvije vrste. Gruba pra\u0161ina su nepravilne \u010destice promjera od 2,5 do 15 mikrona. Obi\u010dno ne uzrokuje kvarove niti iskrenje, ali mo\u017ee utjecati na kontakt konektora. Sitna pra\u0161ina su nepravilne \u010destice promjera manjeg od 2,5 mikrona. Sitna pra\u0161ina koja padne na PCB plo\u010du ima odre\u0111enu adheziju, pa se mo\u017ee ukloniti samo antistati\u010dkom \u010detkom.<\/p>\n\n\n\n

\u0160teta od pra\u0161ine je sljede\u0107a:
a. Kada se pra\u0161ina slegne na povr\u0161inu PCBA, mo\u017ee uzrokovati elektrohemijsku koroziju i pove\u0107ati stopu kvarova ure\u0111aja.
b. Kombinacija pra\u0161ine, toplote i vlage te soli iz rasprskavanja uzrokuje najve\u0107u \u0161tetu na PCBA. Elektroni\u010dki ure\u0111aji blizu obale, u pustinjskim podru\u010djima ili slano-alkalnim krajevima, tijekom ki\u0161ne sezone ju\u017eno od rijeke Huai te u blizini kemijskih postrojenja ili rudarskih podru\u010dja imaju najvi\u0161u stopu kvarova.<\/p>\n\n\n\n

Zbog toga je za\u0161tita od pra\u0161ine va\u017ean dio za\u0161tite proizvoda.<\/p>\n\n\n\n

2.3 Utjecaj slane maglice<\/h3>\n\n\n\n

Solni sprej nastaje djelovanjem valova, plima i oseke, atmosferskom cirkulacijom poput monsuna, zra\u010dnim pritiskom i sun\u010devom svjetlo\u0161\u0107u. Mo\u017ee se \u0161iriti u unutra\u0161njost uz pomo\u0107 vjetra. Koncentracija opada kako se udaljenost od obale pove\u0107ava. Obi\u010dno je na udaljenosti od 1 km od obale koncentracija samo 11 TP3T vrijednosti na obali. Tokom sezone tajfuna, slana maglica mo\u017ee se \u0161iriti dalje u unutra\u0161njost.<\/p>\n\n\n\n

\u0160teta od soli u spreju je sljede\u0107a:<\/strong>
a. O\u0161te\u0107uje presvu\u010deni sloj na metalnim konstrukcijskim dijelovima.
b. Ubrzava elektrohemijsku koroziju, \u0161to mo\u017ee uzrokovati lom metalnih \u017eica i otkazivanje dijelova.<\/p>\n\n\n\n

Sli\u010dni izvori korozije su tako\u0111er \u010desti:<\/strong>
a. Ljudski znoj sadr\u017ei sol, ureu, mlije\u010dnu kiselinu i druge hemijske supstance. One mogu izazvati istu vrstu korozije kao i slani sprej na elektronskim ure\u0111ajima. Iz tog razloga tokom monta\u017ee i upotrebe treba nositi rukavice, a gole ruke ne smiju dodirivati pozla\u0107ene povr\u0161ine.
b. Fluk sadr\u017ei halogene i kisele supstance. PCBA se mora o\u010distiti, a nivo ostataka fluka mora biti strogo kontrolisan.<\/p>\n\n\n\n

Zbog toga je za\u0161tita od soli va\u017ean dio za\u0161tite proizvoda.<\/p>\n\n\n\n

2.4 Utjecaj plijesni<\/h3>\n\n\n\n

Plijesan je uobi\u010dajeni naziv za niti\u010daste gljive. To zna\u010di \u201cplijesnive gljive\u201d. One \u010desto formiraju razgranati i gusti micelij, ali ne stvaraju velika plodna tijela poput gljiva. Na toplim i vla\u017enim mjestima mnogi predmeti razvijaju vidljive dla\u010daste, pamu\u010dne ili mre\u017easte kolonije. To je plijesan.<\/p>\n\n\n\n

\"Effect<\/figure>\n\n\n\n

\u0160teta od plijesni je sljede\u0107a:
Plijesan jede i raste na organskim materijalima. To mo\u017ee smanjiti izolacione performanse materijala i uzrokovati o\u0161te\u0107enja i propadanje.
b. Metaboli\u010dki proizvodi plijesni su organske kiseline. One mogu utjecati na izolaciju i dielektri\u010dku \u010dvrsto\u0107u te mogu uzrokovati probleme s iskrenjem.<\/p>\n\n\n\n

Zbog toga je za\u0161tita od plijesni va\u017ean dio za\u0161tite proizvoda.<\/p>\n\n\n\n

3. Pregled procesa konformalnog premazivanja<\/h2>\n\n\n\n

S obzirom na puni utjecaj vla\u017enosti, pra\u0161ine, soli u spreju, plijesni i drugih okoli\u0161nih faktora korozije, PCBA mora biti \u0161to je vi\u0161e mogu\u0107e izolovan od vanjskog okru\u017eenja kako bi se pobolj\u0161ala pouzdanost. Zbog toga je uveden proces konformalnog premazivanja.<\/p>\n\n\n\n

Konformalni premaz se tako\u0111er naziva povr\u0161inski premaz ili konformalni premaz. Njegovo englesko ime je coating ili conformal coating. To je sada naj\u010de\u0161\u0107a metoda za\u0161tite povr\u0161ine nakon lemljenja za PCB. Ovaj proces nanosi tanki izoliraju\u0107i za\u0161titni sloj na povr\u0161inu PCB-a. Odvaja osjetljive elektroni\u010dke komponente od agresivnih okru\u017eenja, zna\u010dajno pobolj\u0161ava sigurnost i pouzdanost elektroni\u010dkih proizvoda i produ\u017euje njihov vijek trajanja.<\/p>\n\n\n\n

Konformalni premaz mo\u017ee za\u0161tititi sklopove i dijelove od vlage, zaga\u0111iva\u010da, korozije, naprezanja, udaraca, mehani\u010dkih vibracija i toplinskih ciklusa. Tako\u0111er mo\u017ee pobolj\u0161ati mehani\u010dku \u010dvrsto\u0107u i izolacione performanse. Nakon nano\u0161enja premaza na povr\u0161ini tiskane plo\u010dice formira se prozirni za\u0161titni sloj. Taj sloj mo\u017ee sprije\u010diti prodiranje kapljica vode i vlage te sprije\u010diti curenje i kratke spojeve.<\/p>\n\n\n\n

4. Klju\u010dne ta\u010dke procesa konformalnog premazivanja zasnovanog na IPC-A-610E<\/a><\/h2>\n\n\n\n

4.1 Klasifikacija povr\u0161ine premaza<\/h3>\n\n\n\n

4.1.1 Podru\u010dja gdje premaz nije dozvoljen<\/h4>\n\n\n\n

To uklju\u010duje podru\u010dja koja zahtijevaju elektri\u010dnu vezu, kao \u0161to su zlatne podloge, zlatni prsti\u0107i, prevu\u010dene prolazne rupe i testne rupe; baterije i dr\u017ea\u010de baterija; konektore; osigura\u010de i ku\u0107i\u0161ta; hladnjake; kratkospojnike; objektive kamera u opti\u010dkim ure\u0111ajima; potenciometre; senzore; prekida\u010de bez zape\u010da\u0107enih struktura; i sva podru\u010dja gdje \u0107e premaz utjecati na performanse ili normalno funkcionisanje.<\/p>\n\n\n\n

4.1.2 Povr\u0161ine koje se moraju premazati<\/h4>\n\n\n\n

Svi lemni spojevi, pinovi i provodni dijelovi komponenti moraju biti premazani.<\/p>\n\n\n\n

4.1.3 Opcionalna podru\u010dja za premazivanje<\/h4>\n\n\n\n

Za ova podru\u010dja ne postoji jasno obavezno zahtjev za premazivanje. Mogu se premazati u skladu s potrebama proizvoda i standardima kupaca.<\/p>\n\n\n\n

4.2 Standard i metoda ispitivanja debljine prevlake<\/h3>\n\n\n\n

Coating thickness should be measured on a flat, uncovered, cured surface of the printed circuit assembly. It can also be measured on a companion board made during the same process as the assembly. The companion board can be made from the same material as the PCB, or it can be a non-porous material such as metal or glass. Wet film thickness measurement can also be used as an optional way to check coating thickness. In this case, the dry-to-wet film conversion ratio must be known in advance, and the records must be kept.<\/p>\n\n\n\n

Thickness test methods:<\/p>\n\n\n\n

    \n
  1. Dry film thickness measurement: a micrometer can be used, following the IPC-CC-830B standard. A ferrous dry film thickness gauge can also be used.<\/li>\n\n\n\n
  2. Wet film thickness measurement: use a wet film thickness gauge to measure the wet film thickness, then convert it into the actual dry film thickness based on the solid content ratio of the coating material.<\/li>\n<\/ol>\n\n\n\n

    4.3 Edge Resolution Requirement<\/h3>\n\n\n\n

    Definition: the edge of a line sprayed by a normal spray valve cannot be perfectly straight. Small burrs will exist. The width of these burrs is called edge resolution.<\/p>\n\n\n\n

    Process requirement: the smaller the edge resolution value, the higher the coating precision. There is no single fixed standard. It only needs to meet the custom requirement of the customer.<\/p>\n\n\n\n

    4.4 Uniformity Requirement<\/h3>\n\n\n\n

    The conformal coating must form a complete film on the product surface. The film must be even in thickness, smooth, and clear. The coating coverage must be uniform across the whole product. After coating, the product surface must not show cracks, layer separation, orange peel, contamination, capillary effect, bubbles, or other process defects.<\/p>\n\n\n\n

    5. Full Conformal Coating Process and Main Methods<\/h2>\n\n\n\n

    5.1 Early Preparation<\/h3>\n\n\n\n

    Prepare the PCBA product, conformal coating material, and other helper materials. Identify the areas that need local masking protection. Confirm and lock down all key process details.<\/p>\n\n\n\n

    5.2 Cleaning Process<\/h3>\n\n\n\n

    Cleaning should be done as soon as possible after PCBA soldering is finished. This helps avoid solder residue becoming hard to remove after it cures. First, judge whether the contaminant is polar or non-polar, and then match it with the right cleaning agent.<\/p>\n\n\n\n

    If an alcohol-based cleaning agent is used, the work area must have good ventilation. After cleaning, drying must be done strictly, so that leftover solvent does not cause an oven explosion when it evaporates. If a water-wash process is used, use a slightly alkaline emulsified cleaning liquid to remove flux residue, then rinse fully with pure water. Make sure the cleaning quality standard is met.<\/p>\n\n\n\n

    5.3 Masking Protection Process<\/h3>\n\n\n\n

    When selective coating equipment is not used, the no-coating areas must be masked before coating. Use adhesive tape that will not leave residue or transfer glue. For IC parts, anti-static paper tape should be used first. All parts must be masked and protected strictly according to the drawing.<\/p>\n\n\n\n

    5.4 Dehumidification Process<\/h3>\n\n\n\n

    After cleaning and masking, the PCBA must be pre-baked and dehumidified before coating. Based on the maximum temperature that the PCBA can tolerate, choose the right pre-bake temperature and hold time. This removes moisture fully from the board and from inside the components.<\/p>\n\n\n\n

    5.5 Main Coating Methods<\/h3>\n\n\n\n

    The conformal coating process can be chosen flexibly based on the protection level of the PCBA, the production equipment, and the technical setup. The main methods are the following four types.<\/p>\n\n\n\n

    5.5.1 Manual Brush Coating<\/h4>\n\n\n\n

    Brush coating has a wide use range. It is mainly suitable for small batch production, products with complex and dense PCBA structures, and products with strict masking protection needs. It gives strong manual control and can avoid no-coating areas very precisely, so it can prevent contamination.<\/p>\n\n\n\n

    \"Manual<\/figure>\n\n\n\n

    This process uses very little coating material, so it is suitable for high-cost two-component coatings. It requires a high level of skill from the operator. Before work starts, the operator must understand the coating requirements in the drawing, identify different components, know the no-coating areas clearly, and make the marks easy to see. During the whole work process, bare hands must not touch the printed plug-in parts, so that secondary contamination can be avoided.<\/p>\n\n\n\n

    5.5.2 Manual Dip Coating<\/h4>\n\n\n\n

    Dip coating can form a uniform, continuous, and complete coating layer. The overall coating effect is very good. However, it is not suitable for PCBA products that have adjustable capacitors, adjustable magnetic cores, potentiometers, cup-shaped magnetic cores, or parts with poor sealing.<\/p>\n\n\n\n

    The key process parameters for dip coating are: adjust the viscosity of the conformal coating accurately; control the PCBA lifting speed strictly; the lifting speed must not be more than 1 meter per second, so that bubbles do not form in the coating.<\/p>\n\n\n\n

    5.5.3 Manual Spray Coating<\/h4>\n\n\n\n

    This method fits products with complex structures, many types, and small batch sizes, where mass production by automatic equipment is not possible. It can cover special corners and gap areas very well.<\/p>\n\n\n\n

    Work notes: spray mist can easily contaminate no-coating areas such as PCB plug-in parts, IC sockets, precision contacts, and grounding areas. Therefore, masking protection must be done before spraying. Operators must not touch printed plugs with bare hands, so that the contact surface will not become dirty.<\/p>\n\n\n\n

    5.5.4 Automatic Spray Coating<\/h4>\n\n\n\n

    This method usually uses selective automatic coating equipment. It is suitable for large-scale standardized production. It has the advantages of good coating consistency, high precision, and less environmental pollution. As the industry upgrades, labor costs rise, and environmental rules become stricter, automatic spray equipment is slowly replacing traditional manual coating. It is becoming the main method in the industry.<\/p>\n\n\n\n

    \"Automatic<\/figure>","protected":false},"excerpt":{"rendered":"

    1. Process Background As PCBA components become smaller and more dense, the distance between parts and the stand-off height of 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