1. Pamwamba pa PCB: OSP, HASL, HASL Yopanda Lead, Tin Immersion, ENIG, Silver Immersion, Golide Wolimba, Kuyika golide pa bolodi lonse, chala chagolide, ENEPIG...

OSP: mtengo wotsika, solderability wabwino, nkhanza zosungirako, nthawi yochepa, luso chilengedwe, kuwotcherera wabwino, yosalala ...

HASL: kawirikawiri ndi multilayers HDI PCB Zitsanzo (4 - 46 zigawo), wakhala ntchito ndi mauthenga ambiri lalikulu, makompyuta, zipangizo zachipatala ndi mabizinesi zakuthambo ndi mayunitsi kafukufuku.

Chala chagolide: ndikulumikizana pakati pa memory slot ndi memory chip, ma signature onse amatumizidwa ndi chala chagolide.

Chala chagolide chimakhala ndi zolumikizira zingapo zagolide, zomwe zimatchedwa "chala chagolide" chifukwa chakutidwa ndi golide komanso mawonekedwe awo ngati chala. Chala chagolide AMAGWIRITSA NTCHITO njira yapadera yoveketsa zotchingira zamkuwa ndi golidi, zomwe zimalimbana kwambiri ndi okosijeni komanso kuwongolera kwambiri. Koma mtengo wa golidi ndi wokwera mtengo, plating yamakono imagwiritsidwa ntchito m'malo mwa kukumbukira zambiri. Kuyambira zaka za m'ma 90s, malata adayamba kufalikira, bolodi, kukumbukira, ndi zida zamakanema monga "chala chagolide" nthawi zonse zimagwiritsidwa ntchito ndi malata, zida zina zogwira ntchito kwambiri za seva / malo ogwirira ntchito ndizomwe zimalumikizana kuti zipitilize. kugwiritsa ntchito golide wokutidwa, ndiye kuti mtengo wake ndi wokwera mtengo.

1. Chifukwa chiyani kugwiritsa ntchitogolide plating board?

Ndi kuphatikiza kwa IC kumtunda ndi kumtunda, mapazi a IC akuchulukirachulukira. Pamene ofukula malata kupopera mbewu mankhwalawa ndi kovuta kuwombetsa chabwino kuwotcherera PAd lathyathyathya, zomwe zimabweretsa zovuta SMT mounting; Komanso, alumali moyo wa malata kupopera mbale ndi lalifupi kwambiri. Komabe, mbale yagolide imathetsa mavuto awa:

1.) Pakuti pamwamba phiri luso, makamaka kwa 0603 ndi 0402 kopitilira muyeso-yaing'ono tebulo phiri, chifukwa flatness wa kuwotcherera PAD mwachindunji zogwirizana ndi khalidwe la solder phala ndondomeko yosindikiza, kumbuyo kwa kukonzanso otaya kuwotcherera khalidwe ali kukhudza kwambiri, kotero, mbale yonse yoyika golide mu kachulukidwe kwambiri komanso ukadaulo wokwera kwambiri wapa tebulo nthawi zambiri umawoneka.

2.) Mu gawo chitukuko, chikoka cha zinthu monga zigawo zogula zambiri si bolodi kuti kuwotcherera yomweyo, koma nthawi zambiri kudikira masabata angapo kapena miyezi isanagwiritse ntchito, alumali moyo wa golide yokutidwa bolodi ndi yaitali kuposa terne. zitsulo nthawi zambiri, kotero aliyense ali wokonzeka kutengera. Kupatula apo, PCB yokutidwa ndi golide mumadigiri amtengo wagawo lachitsanzo poyerekeza ndi mbale za pewter

3.)

4.) Koma ndi mawaya ochulukirachulukira, makulidwe a mzere, masitayilo afika 3-4MIL

Chifukwa chake, zimabweretsa vuto lalifupi la waya wagolide: ndi kuchuluka kwa ma frequency a siginecha, kukopa kwa ma siginecha mu zokutira zingapo chifukwa champhamvu ya khungu kumawonekera kwambiri.

(Skin effect : High frequency alternating current, panopa imakonda kuyang'ana pamwamba pa waya. Malinga ndi kuwerengera, kuya kwa khungu kumayenderana ndi ma frequency.)

1. Chifukwa chiyani kugwiritsa ntchitokumizidwa golide PCB?

Pali zina zowonetsera golide wa PCB womiza monga pansipa:

1.) mawonekedwe a kristalo opangidwa ndi kumiza golide ndi plating golide ndi osiyana, mtundu wa kumizidwa golide adzakhala wabwino kuposa plating golide ndipo kasitomala amakhutitsidwa kwambiri. Ndiye kupsyinjika kwa mbale ya golide yomira kumakhala kosavuta kulamulira, zomwe zimathandiza kwambiri pokonza zinthu. Pa nthawi yomweyi komanso chifukwa golide ndi wofewa kuposa golide, kotero mbale ya golide musavale - kugonjetsedwa kwa golide chala.

2.) Kumizidwa Golide ndikosavuta kuwotcherera kuposa plating golide, ndipo sikungayambitse kuwotcherera koyipa ndi madandaulo amakasitomala.

3.) golide wa nickel amangopezeka pazitsulo zowotcherera pa ENIG PCB, kufalitsa chizindikiro pakhungu kumakhala mumkuwa wosanjikiza, zomwe sizingakhudze chizindikiro, komanso musatsogolere chingwe chachidule cha waya wagolide. The soldermask pa dera ndi molimba kwambiri pamodzi ndi zigawo zamkuwa.

4.) Kapangidwe ka kristalo wa golide womizidwa ndi wocheperapo kuposa plating ya golide, ndizovuta kupanga oxidation.

5.) Sipadzakhala zotsatira pa katayanitsidwe pamene chipukuta misozi chapangidwa

6.) Kusalala ndi moyo wautumiki wa mbale yagolide ndi yabwino ngati ya golide.

1. Immersion Gold VS Gold plating

Pali mitundu iwiri yaukadaulo wopaka golide: imodzi ndi plating yamagetsi yamagetsi, inayo ndi Immersion Gold

Pakupanga golide, zotsatira za tini zimachepetsedwa kwambiri, ndipo zotsatira za golidi zimakhala bwino; Pokhapokha ngati wopanga akufuna kumanga, kapena tsopano opanga ambiri amasankha njira yomira ya golide!

Nthawi zambiri, mankhwala pamwamba PCB akhoza kugawidwa m'mitundu zotsatirazi: plating golide (electroplating, kumizidwa golide), plating siliva, OSP, HASL (ndi popanda kutsogolera), amene makamaka kwa FR4 kapena CEM-3 mbale, mapepala m'munsi. zipangizo ndi rosin ❖ kuyanika pamwamba mankhwala; Pa malata osauka (kudya malata osauka) ngati kuchotsa phala opanga ndi zinthu processing zifukwa.

Pali zifukwa zina za vuto la PCB:

1. Pa PCB kusindikiza, kaya pali mafuta permeating filimu pamwamba pa PAN, akhoza kuletsa zotsatira za malata; izi zikhoza kutsimikiziridwa ndi solder float test

2. Kaya malo okongoletsedwa a PAN angakwaniritse zofunikira za mapangidwe, ndiye kuti, ngati chowotcherera chingapangidwe kuti chitsimikizidwe kuthandizira zigawozo.

3. Chowotcherera chowotcherera sichidaipitsidwa, chomwe chingayesedwe ndi kuipitsidwa kwa ion; t

Za pamwamba:

Golide plating, kungapangitse PCB yosungirako nthawi yaitali, ndi kunja chilengedwe kutentha ndi chinyezi kusintha ndi yaing'ono (poyerekeza ndi mankhwala ena pamwamba), zambiri, akhoza kusungidwa kwa pafupifupi chaka; HASL kapena kutsogolera kwaulere HASL pamwamba mankhwala chachiwiri, OSP kachiwiri, awiri pamwamba mankhwala mu chilengedwe kutentha ndi chinyezi yosungirako nthawi kulabadira zambiri za

Nthawi zonse, chithandizo cha siliva padziko lapansi ndi chosiyana pang'ono, mtengo wake ndi wokwera kwambiri, kusungirako kumakhala kovuta kwambiri, kufunikira kosagwiritsa ntchito ma CD a sulfure! Ndipo sungani kwa miyezi itatu! Pamphamvu ya malata, golidi, OSP, kutsitsi kwa malata kumakhala kofanana, opanga ayenera kuganizira za mtengo wake!