{"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\/da\/pcba-conformal-coating-guide\/","title":{"rendered":"SMT PCBA Conformal Coating Process Guide"},"content":{"rendered":"

1. Baggrund for processen<\/h2>\n\n\n\n

Efterh\u00e5nden som PCBA-komponenterne bliver mindre og mere t\u00e6tte, bliver afstanden mellem delene og deres afstandsh\u00f8jde, som er afstanden mellem delen og printkortet, ogs\u00e5 mindre. Samtidig har milj\u00f8m\u00e6ssige faktorer en st\u00f8rre og st\u00f8rre effekt p\u00e5 PCBA<\/a>. P\u00e5 grund af dette har elektroniske produkter nu brug for et h\u00f8jere niveau af p\u00e5lidelighed.<\/p>\n\n\n\n

PCBA-dele \u00e6ndrer sig fra store til sm\u00e5 og fra l\u00f8st layout til t\u00e6t layout. Under tendensen til miniaturisering og h\u00f8j t\u00e6thed bliver fejlproblemer for\u00e5rsaget af milj\u00f8et mere og mere alvorlige. Derfor er conformal coating blevet en n\u00f8gleproces til at beskytte PCBA'ens p\u00e5lidelighed under brug.<\/p>\n\n\n\n

2. Effekten af forskellige milj\u00f8faktorer p\u00e5 PCBA<\/h2>\n\n\n\n

Almindelige milj\u00f8faktorer som fugt, st\u00f8v, saltt\u00e5ge og skimmel kan alle for\u00e5rsage forskellige former for PCBA-fejl. De vigtigste effekter er som f\u00f8lger.<\/p>\n\n\n\n

2.1 Effekt af luftfugtighed<\/h3>\n\n\n\n

De fleste elektroniske printkort, der bruges i et \u00e5bent milj\u00f8, er udsat for risiko for korrosion. Vand er det vigtigste medium, der for\u00e5rsager korrosion. Vandmolekyler er meget sm\u00e5, s\u00e5 de kan passere gennem de molekyl\u00e6re huller i nogle polymermaterialer og tr\u00e6nge ind i materialet. De kan ogs\u00e5 g\u00e5 gennem huller i bel\u00e6gningen og n\u00e5 metallaget nedenunder og derefter for\u00e5rsage korrosion.<\/p>\n\n\n\n

N\u00e5r luften n\u00e5r et vist fugtighedsniveau, kan det for\u00e5rsage elektrokemisk migration p\u00e5 printkortet, l\u00e6kstr\u00f8m og signalforvr\u00e6ngning i h\u00f8jfrekvente kredsl\u00f8b.<\/p>\n\n\n\n

Damp eller fugt + ionforurenende stoffer som salte og fluxaktivatorer = ledende elektrolyt + stresssp\u00e6nding = elektrokemisk migration<\/p>\n\n\n\n

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

N\u00e5r den relative luftfugtighed n\u00e5r 80%, kan der dannes en vandfilm med en tykkelse p\u00e5 5 til 20 molekyler. P\u00e5 dette tidspunkt kan mange molekyler bev\u00e6ge sig frit. Hvis der er kulstof til stede, kan der ske elektrokemiske reaktioner. N\u00e5r den relative luftfugtighed n\u00e5r 60%, kan der dannes en vandfilm med en tykkelse p\u00e5 2 til 4 molekyler p\u00e5 enhedens overflade. Hvis forurenende stoffer opl\u00f8ses i den, kan der ske kemiske reaktioner. N\u00e5r den relative luftfugtighed er lavere end 20%, stopper n\u00e6sten al korrosion.<\/p>\n\n\n\n

Derfor er fugtbeskyttelse en vigtig del af produktbeskyttelsen.<\/p>\n\n\n\n

For elektronisk udstyr findes fugt i tre former: regnvand, kondens og vanddamp. Vand er en elektrolyt. Det kan opl\u00f8se mange \u00e6tsende ioner og derefter korrodere metal. N\u00e5r temperaturen i et omr\u00e5de p\u00e5 udstyret er lavere end dugpunktet, vil der dannes kondens p\u00e5 den p\u00e5g\u00e6ldende overflade. Det kan ske p\u00e5 konstruktionsdele eller p\u00e5 PCBA'en.<\/p>\n\n\n\n

2.2 Effekt af st\u00f8v<\/h3>\n\n\n\n

St\u00f8v findes i luften. St\u00f8v kan absorbere ionforurenende stoffer og derefter s\u00e6tte sig i elektronisk udstyr. Det kan for\u00e5rsage fejl. Dette er et almindeligt problem for udend\u00f8rs elektronisk udstyr.<\/p>\n\n\n\n

St\u00f8v kan opdeles i to typer. Groft st\u00f8v er uregelm\u00e6ssige partikler med en diameter p\u00e5 2,5 til 15 mikrometer. Det for\u00e5rsager normalt ikke fejl eller lysbuer, men det kan p\u00e5virke kontakten p\u00e5 stikkene. Fint st\u00f8v er uregelm\u00e6ssige partikler med en diameter p\u00e5 mindre end 2,5 mikrometer. Fint st\u00f8v, der falder p\u00e5 et PCBA-kort, har en vis vedh\u00e6ftning, s\u00e5 det kan kun fjernes med en antistatisk b\u00f8rste.<\/p>\n\n\n\n

St\u00f8vets skadevirkninger er som f\u00f8lger:
a. N\u00e5r st\u00f8v l\u00e6gger sig p\u00e5 overfladen af PCBA'en, kan det for\u00e5rsage elektrokemisk korrosion og \u00f8ge enhedens fejlrate.
b. Kombinationen af st\u00f8v, varme og fugtighed og saltspray for\u00e5rsager mest skade p\u00e5 PCBA. Elektronisk udstyr n\u00e6r kysten, i \u00f8rkenomr\u00e5der eller salt- og alkaliland, i regntiden syd for Huai-floden og n\u00e6r kemiske anl\u00e6g eller mineomr\u00e5der har den h\u00f8jeste fejlrate.<\/p>\n\n\n\n

Derfor er st\u00f8vbeskyttelse en vigtig del af produktbeskyttelsen.<\/p>\n\n\n\n

2.3 Effekt af saltspray<\/h3>\n\n\n\n

Saltspray dannes af b\u00f8lger, tidevand, atmosf\u00e6risk cirkulation s\u00e5som monsun, lufttryk og sollys. Det kan drive ind i landet med vinden. Koncentrationen bliver lavere, n\u00e5r afstanden fra kysten \u00f8ges. Normalt er koncentrationen 1 km fra kysten kun 1% af v\u00e6rdien ved kysten. I tyfons\u00e6soner kan saltspray drive l\u00e6ngere ind i landet.<\/p>\n\n\n\n

Skadevirkningerne af saltspray er som f\u00f8lger:<\/strong>
a. Det beskadiger pletteringslaget p\u00e5 konstruktionsdele af metal.
b. Det fremskynder elektrokemisk korrosion, som kan f\u00e5 metaltr\u00e5de til at kn\u00e6kke og dele til at g\u00e5 i stykker.<\/p>\n\n\n\n

Lignende korrosionskilder er ogs\u00e5 almindelige:<\/strong>
a. Menneskesved indeholder salt, urinstof, m\u00e6lkesyre og andre kemiske stoffer. Disse kan for\u00e5rsage den samme form for korrosion som saltt\u00e5ge p\u00e5 elektroniske enheder. Derfor skal man b\u00e6re handsker under montering og brug, og man m\u00e5 ikke r\u00f8re ved belagte overflader med bare h\u00e6nder.
b. Flux indeholder halogen og sure stoffer. PCBA skal reng\u00f8res, og niveauet af fluxrester skal kontrolleres n\u00f8je.<\/p>\n\n\n\n

Derfor er beskyttelse mod saltt\u00e5ge en vigtig del af produktbeskyttelsen.<\/p>\n\n\n\n

2.4 Effekt af skimmelsvamp<\/h3>\n\n\n\n

Skimmelsvamp er en f\u00e6llesbetegnelse for tr\u00e5dformede svampe. Det betyder \u201cskimmelsvampe\u201d. De danner ofte forgrenet og t\u00e6t mycelium, men de danner ikke store frugtlegemer som svampe. P\u00e5 varme og fugtige steder vokser mange ting i synlige lodne, bomuldslignende eller spindelv\u00e6vslignende kolonier. Det er skimmelsvamp.<\/p>\n\n\n\n

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

Skimmelsvampens skadevirkninger er som f\u00f8lger:
a. Skimmelsvamp \u00e6der og vokser p\u00e5 organiske materialer. Det kan neds\u00e6tte materialets isoleringsevne og for\u00e5rsage skader og svigt.
b. Skimmelsvampens stofskifteprodukter er organiske syrer. De kan p\u00e5virke isoleringen og den dielektriske styrke og kan for\u00e5rsage problemer med lysbuer.<\/p>\n\n\n\n

Derfor er beskyttelse mod skimmelsvamp en vigtig del af produktbeskyttelsen.<\/p>\n\n\n\n

3. Oversigt over Conformal Coating-processen<\/h2>\n\n\n\n

P\u00e5 grund af den fulde effekt af fugtighed, st\u00f8v, saltt\u00e5ge, mug og andre milj\u00f8m\u00e6ssige korrosionsfaktorer skal PCBA'en isoleres fra det ydre milj\u00f8 s\u00e5 meget som muligt for at forbedre p\u00e5lideligheden. Det er grunden til, at conformal coating-processen blev introduceret.<\/p>\n\n\n\n

Conformal coating kaldes ogs\u00e5 overfladebel\u00e6gning eller conformal coating. Dets engelske navn er coating eller conformal coating. Det er nu den mest almindelige metode til overfladebeskyttelse af printkort efter lodning. Denne proces p\u00e5f\u00f8rer et tyndt isolerende beskyttelseslag p\u00e5 printkortets overflade. Det adskiller f\u00f8lsomme elektroniske dele fra barske milj\u00f8er, forbedrer i h\u00f8j grad sikkerheden og p\u00e5lideligheden af elektroniske produkter og forl\u00e6nger produktets levetid.<\/p>\n\n\n\n

Conformal coating kan beskytte kredsl\u00f8b og dele mod fugt, forurenende stoffer, korrosion, stress, st\u00f8d, mekaniske vibrationer og termisk cykling. Det kan ogs\u00e5 forbedre den mekaniske styrke og isoleringsevnen. Efter bel\u00e6gningen dannes der en gennemsigtig beskyttelsesfilm p\u00e5 printkortets overflade. Denne film kan forhindre vanddr\u00e5ber og fugt i at tr\u00e6nge ind, og den kan forhindre l\u00e6kage og kortslutningsfejl.<\/p>\n\n\n\n

4. N\u00f8glepunkter i Conformal Coating-processen baseret p\u00e5 IPC-A-610E<\/a><\/h2>\n\n\n\n

4.1 Klassificering af bel\u00e6gningsomr\u00e5der<\/h3>\n\n\n\n

4.1.1 Omr\u00e5der, hvor bel\u00e6gning ikke er tilladt<\/h4>\n\n\n\n

Disse omfatter omr\u00e5der, der har brug for elektrisk forbindelse, s\u00e5som guldpuder, guldfingre, gennemg\u00e5ende huller og testhuller; batterier og batteriholdere; stik; sikringer og huse; k\u00f8lelegemer; jumpere; kameralinser i optiske enheder; potentiometre; sensorer; kontakter uden forseglede strukturer; og alle omr\u00e5der, hvor bel\u00e6gning vil p\u00e5virke ydeevnen eller den normale drift.<\/p>\n\n\n\n

4.1.2 Omr\u00e5der, der skal bel\u00e6gges<\/h4>\n\n\n\n

Alle loddesamlinger, stifter og ledende dele af komponenter skal v\u00e6re belagt.<\/p>\n\n\n\n

4.1.3 Valgfrie bel\u00e6gningsomr\u00e5der<\/h4>\n\n\n\n

Disse omr\u00e5der har ikke noget klart krav om obligatorisk overfladebehandling. De kan overfladebehandles ud fra produktbehov og kundestandarder.<\/p>\n\n\n\n

4.2 Standard for bel\u00e6gningstykkelse og testmetode<\/h3>\n\n\n\n

Bel\u00e6gningens tykkelse skal m\u00e5les p\u00e5 en flad, ud\u00e6kket, h\u00e6rdet overflade af det trykte kredsl\u00f8b. Den kan ogs\u00e5 m\u00e5les p\u00e5 et ledsagende printkort, der er lavet i samme proces som samlingen. F\u00f8lgepladen kan v\u00e6re lavet af det samme materiale som printkortet, eller det kan v\u00e6re et ikke-por\u00f8st materiale som metal eller glas. V\u00e5dfilmtykkelsesm\u00e5ling kan ogs\u00e5 bruges som en valgfri m\u00e5de at kontrollere bel\u00e6gningstykkelsen p\u00e5. I dette tilf\u00e6lde skal forholdet mellem t\u00f8r og v\u00e5d film v\u00e6re kendt p\u00e5 forh\u00e5nd, og optegnelserne skal opbevares.<\/p>\n\n\n\n

Testmetoder for tykkelse:<\/p>\n\n\n\n

    \n
  1. M\u00e5ling af t\u00f8rfilmstykkelse: Der kan bruges et mikrometer i henhold til IPC-CC-830B-standarden. En jernholdig t\u00f8rfilmstykkelsesm\u00e5ler kan ogs\u00e5 bruges.<\/li>\n\n\n\n
  2. M\u00e5ling af v\u00e5dfilmtykkelse: Brug en v\u00e5dfilmtykkelsesm\u00e5ler til at m\u00e5le v\u00e5dfilmtykkelsen, og konverter den derefter til den faktiske t\u00f8rfilmtykkelse baseret p\u00e5 bel\u00e6gningsmaterialets faststofindhold.<\/li>\n<\/ol>\n\n\n\n

    4.3 Krav til kantopl\u00f8sning<\/h3>\n\n\n\n

    Definition: Kanten af en linje, der spr\u00f8jtes med en normal spr\u00f8jteventil, kan ikke v\u00e6re helt lige. Der vil v\u00e6re sm\u00e5 grater. Bredden af disse grater kaldes kantopl\u00f8sning.<\/p>\n\n\n\n

    Proceskrav: Jo mindre kantopl\u00f8sningsv\u00e6rdi, jo h\u00f8jere bel\u00e6gningspr\u00e6cision. Der er ingen fast standard. Den beh\u00f8ver kun at opfylde kundens tilpassede krav.<\/p>\n\n\n\n

    4.4 Krav om ensartethed<\/h3>\n\n\n\n

    Den konforme bel\u00e6gning skal danne en komplet film p\u00e5 produktets overflade. Filmen skal v\u00e6re j\u00e6vn i tykkelsen, glat og klar. Bel\u00e6gningen skal v\u00e6re ensartet p\u00e5 tv\u00e6rs af hele produktet. Efter bel\u00e6gningen m\u00e5 produktoverfladen ikke have revner, lagadskillelse, appelsinskal, forurening, kapillareffekt, bobler eller andre procesfejl.<\/p>\n\n\n\n

    5. Fuld konform bel\u00e6gningsproces og vigtigste metoder<\/h2>\n\n\n\n

    5.1 Tidlig forberedelse<\/h3>\n\n\n\n

    Forbered PCBA-produktet, conformal coating-materialet og andre hj\u00e6lpematerialer. Identificer de omr\u00e5der, der har brug for lokal maskeringsbeskyttelse. Bekr\u00e6ft og fastl\u00e5s alle vigtige procesdetaljer.<\/p>\n\n\n\n

    5.2 Reng\u00f8ringsproces<\/h3>\n\n\n\n

    Reng\u00f8ringen skal ske s\u00e5 hurtigt som muligt, efter at PCBA-lodningen er afsluttet. P\u00e5 den m\u00e5de undg\u00e5r man, at lodderesterne bliver sv\u00e6re at fjerne, n\u00e5r de er h\u00e6rdet. F\u00f8rst skal du vurdere, om forureningen er pol\u00e6r eller upol\u00e6r, og derefter matche den med det rigtige reng\u00f8ringsmiddel.<\/p>\n\n\n\n

    Hvis der bruges et alkoholbaseret reng\u00f8ringsmiddel, skal arbejdsomr\u00e5det have god ventilation. Efter reng\u00f8ringen skal der t\u00f8rres omhyggeligt, s\u00e5 rester af opl\u00f8sningsmiddel ikke for\u00e5rsager en eksplosion i ovnen, n\u00e5r det fordamper. Hvis der anvendes en vandvaskeproces, skal du bruge en let alkalisk emulgeret reng\u00f8ringsv\u00e6ske til at fjerne fluxrester og derefter skylle helt med rent vand. S\u00f8rg for, at standarden for reng\u00f8ringskvalitet er opfyldt.<\/p>\n\n\n\n

    5.3 Maskering af beskyttelsesprocessen<\/h3>\n\n\n\n

    N\u00e5r der ikke anvendes selektivt bel\u00e6gningsudstyr, skal de omr\u00e5der, der ikke skal bel\u00e6gges, maskeres f\u00f8r bel\u00e6gningen. Brug selvkl\u00e6bende tape, der ikke efterlader rester eller overf\u00f8rer lim. Til IC-dele skal der f\u00f8rst bruges antistatisk papirtape. Alle dele skal maskeres og beskyttes n\u00f8je i henhold til tegningen.<\/p>\n\n\n\n

    5.4 Affugtningsprocessen<\/h3>\n\n\n\n

    Efter reng\u00f8ring og maskering skal PCBA'en forbages og affugtes f\u00f8r coating. Baseret p\u00e5 den maksimale temperatur, som PCBA'en kan t\u00e5le, skal du v\u00e6lge den rigtige forbagningstemperatur og holdetid. P\u00e5 den m\u00e5de fjernes fugten helt fra printet og inde i komponenterne.<\/p>\n\n\n\n

    5.5 De vigtigste bel\u00e6gningsmetoder<\/h3>\n\n\n\n

    Den konforme coatingproces kan v\u00e6lges fleksibelt ud fra PCBA'ens beskyttelsesniveau, produktionsudstyret og den tekniske ops\u00e6tning. De vigtigste metoder er f\u00f8lgende fire typer.<\/p>\n\n\n\n

    5.5.1 Manuel bel\u00e6gning med b\u00f8rste<\/h4>\n\n\n\n

    B\u00f8rstelakering har et bredt anvendelsesomr\u00e5de. Den er prim\u00e6rt velegnet til sm\u00e5 serier, produkter med komplekse og t\u00e6tte PCBA-strukturer og produkter med strenge krav til maskeringsbeskyttelse. Den giver st\u00e6rk manuel kontrol og kan undg\u00e5 omr\u00e5der uden bel\u00e6gning meget pr\u00e6cist, s\u00e5 den kan forhindre forurening.<\/p>\n\n\n\n

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

    Denne proces bruger meget lidt bel\u00e6gningsmateriale, s\u00e5 den er velegnet til dyre tokomponentbel\u00e6gninger. Den kr\u00e6ver et h\u00f8jt niveau af f\u00e6rdigheder fra operat\u00f8ren. F\u00f8r arbejdet starter, skal operat\u00f8ren forst\u00e5 kravene til overfladebehandling p\u00e5 tegningen, identificere forskellige komponenter, kende de omr\u00e5der, der ikke m\u00e5 overfladebehandles, tydeligt og g\u00f8re m\u00e6rkerne lette at se. Under hele arbejdsprocessen m\u00e5 man ikke r\u00f8re ved de trykte plug-in-dele med bare h\u00e6nder, s\u00e5 man undg\u00e5r sekund\u00e6r kontaminering.<\/p>\n\n\n\n

    5.5.2 Manuel dyppebel\u00e6gning<\/h4>\n\n\n\n

    Dypbel\u00e6gning kan danne et ensartet, kontinuerligt og komplet bel\u00e6gningslag. Den samlede bel\u00e6gningseffekt er meget god. Det er dog ikke egnet til PCBA-produkter, der har justerbare kondensatorer, justerbare magnetiske kerner, potentiometre, kopformede magnetiske kerner eller dele med d\u00e5rlig forsegling.<\/p>\n\n\n\n

    De vigtigste procesparametre for dyppebel\u00e6gning er: Juster viskositeten af den konforme bel\u00e6gning n\u00f8jagtigt; kontroller PCBA-l\u00f8ftehastigheden n\u00f8je; l\u00f8ftehastigheden m\u00e5 ikke v\u00e6re mere end 1 meter i sekundet, s\u00e5 der ikke dannes bobler i bel\u00e6gningen.<\/p>\n\n\n\n

    5.5.3 Manuel spr\u00f8jtelakering<\/h4>\n\n\n\n

    Denne metode passer til produkter med komplekse strukturer, mange typer og sm\u00e5 seriest\u00f8rrelser, hvor masseproduktion med automatisk udstyr ikke er mulig. Den kan d\u00e6kke specielle hj\u00f8rner og mellemrum meget godt.<\/p>\n\n\n\n

    Arbejdsnoter: Sprayt\u00e5ge kan let forurene omr\u00e5der uden bel\u00e6gning, s\u00e5som PCB-stikdele, IC-sokler, pr\u00e6cisionskontakter og jordingsomr\u00e5der. Derfor skal der foretages afsk\u00e6rmning f\u00f8r spr\u00f8jtning. Operat\u00f8rer m\u00e5 ikke r\u00f8re ved trykte stik med bare h\u00e6nder, s\u00e5 kontaktfladen ikke bliver snavset.<\/p>\n\n\n\n

    5.5.4 Automatisk spr\u00f8jtebel\u00e6gning<\/h4>\n\n\n\n

    Denne metode bruger normalt selektivt automatisk bel\u00e6gningsudstyr. Den er velegnet til standardiseret produktion i stor skala. Den har fordelene ved god bel\u00e6gningskonsistens, h\u00f8j pr\u00e6cision og mindre milj\u00f8forurening. Efterh\u00e5nden som industrien opgraderes, l\u00f8nomkostningerne stiger, og milj\u00f8reglerne bliver strengere, erstatter automatisk spr\u00f8jteudstyr langsomt traditionel manuel bel\u00e6gning. Det er ved at blive den vigtigste metode i industrien.<\/p>\n\n\n\n

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

    1. 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