PCB thekenoloji ea kalafo ea holim’a metsi e bua ka mokhoa oa ho etsa lera le ka holimo holim’a likarolo tsa PCB le lintlha tsa khokahanyo ea motlakase tse fapaneng le thepa ea mochine, ea ‘mele le ea lik’hemik’hale ea substrate. Sepheo sa eona ke ho netefatsa hore thepa e ntle ea solderability kapa motlakase oa PCB. Hobane koporo e atisa ho ba teng ka mokhoa oa li-oxide moeeng, tse amang ka ho teba ho solderability le thepa ea motlakase ea PCB, hoa hlokahala ho etsa phekolo ea holim’a PCB.

Hona joale, mekhoa e tloaelehileng ea phekolo ea holim’a metsi ke e latelang:

1. Ho leka-lekanya moea o chesang

Bokaholimo ba PCB bo koahetsoe ka solder e qhibilihisitsoeng ea tin-lead ‘me e batalatsoa ka moea o hatelitsoeng o futhumetseng (o fefoletsoeng) ho etsa lera la ho roala le hanyetsanang le oxidation ea koporo le ho fana ka solderability e ntle. Nakong ea mocheso oa moea o chesang, solder le koporo li etsa motsoako oa tšepe ea koporo-tšepe moo ho kopanang teng, ‘me botenya bo ka ba 1 ho 2 mils;

2. Organic Anti-oxidation (OSP)

Ka holim’a koporo e hloekileng e se nang letho, filimi ea tlhaho e lengoa ka lik’hemik’hale. Lera lena la filimi le na le anti-oxidation, ho hanyetsa mocheso oa mocheso, le ho hanyetsa mongobo ho sireletsa bokaholimo ba koporo ho tloha mafome (oxidation kapa sulfidation, joalo-joalo) sebakeng se tloaelehileng; ka nako e ts’oanang, e tlameha ho thusoa habonolo ho tjheseletsa e latelang mocheso o phahameng The flux e tlosoa ka potlako ho nolofalletsa ho tjheseletsa;

3. Khauta ea nickel e se nang motlakase

Lera le teteaneng la alloy ea nickel-gold e nang le thepa e ntle ea motlakase e phuthetsoe holim’a koporo ‘me e ka sireletsa PCB nako e telele. Ho fapana le OSP, e sebelisoang feela e le lera le thibelang mafome, e ka ba molemo ts’ebelisong ea nako e telele ea PCB le ho fihlela ts’ebetso e ntle ea motlakase. Ho phaella moo, e boetse e na le mamello ho tikoloho eo mekhoa e meng ea phekolo ea holim’a metsi e se nang eona;

4. Silivera ea ho Inela Lik’hemik’hale

Pakeng tsa OSP le nickel e se nang motlakase / khauta e qoelisoang, mokhoa ona o bonolo ebile o potlakile. Ha e pepesehetse mocheso, mongobo le tšilafalo, e ntse e ka fana ka ts’ebetso e ntle ea motlakase le ho boloka solderability e ntle, empa e tla lahleheloa ke khanya ea eona. Hobane ha ho na nickel tlas’a lera la silevera, silevera ea ho qoelisoa ha e na matla a matle a ‘mele a nickel e se nang motlakase / khauta ea ho qoelisoa;

5. Electroplating nickel khauta

Mokhanni holim’a PCB e electroplated le lera la nickel ebe electroplated le lera la khauta. Sepheo se seholo sa ho roala nickel ke ho thibela ho arohana pakeng tsa khauta le koporo. Ho na le mefuta e ‘meli ea khauta ea nickel e entsoeng ka electroplated: khauta e bonolo (khauta e hloekileng, khauta e bontša hore ha e shebahale e khanyang) le khauta e thata ea khauta (ka holim’a metsi e boreleli ebile e thata, e sa sebetsane, e na le cobalt le likarolo tse ling, le bokaholimo. e shebahala e kganya). Khauta e bonolo e sebelisoa haholo-holo bakeng sa terata ea khauta nakong ea ho paka chip; khauta e thata e sebelisoa haholo-holo bakeng sa ho hokela motlakase libakeng tseo e seng tsa soldering (joaloka menoana ea khauta).

6. PCB lebasetere holim ‘a phekolo thekenoloji

Khetha mekhoa e ‘meli kapa ho feta ea kalafo ea holim’a metsi bakeng sa kalafo ea bokaholimo. Mefuta e tloaelehileng ke: Nickel ea Khauta ea Ho qoelisoa + Anti-oxidation, Electroplating Nickel Gold + Immersion Nickel Gold, Electroplating Nickel Gold + Hot Air Leveling, Immersion Nickel Gold + Hot Air Leveling.

Tekanyo ea moea o chesang (e se nang loto/e etelletsoeng pele) ke mokhoa o atileng haholo ebile o theko e tlase ho feta mefuta eohle ea kalafo ea holim’a metsi, empa ka kopo ela hloko melaoana ea RoHS ea EU.

RoHS: RoHS ke tekanyetso e tlamang e thehiloeng ke molao oa EU. Lebitso la eona le felletseng ke “Thibelo ea Lintho Tse Kotsi” (Thibelo ea Lintho Tse Kotsi). Tekanyetso e kentsoe ts’ebetsong ka molao ka la 1 Phupu 2006, ‘me e sebelisoa haholo ho tiisa maemo a thepa le ts’ebetso ea lihlahisoa tsa elektroniki le tsa motlakase, ho etsa hore e be molemong oa bophelo bo botle ba batho le ts’ireletso ea tikoloho. Sepheo sa maemo ana ke ho felisa lintho tse tšeletseng tse kenyeletsang lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls le polybrominated diphenyl ethers lihlahisoa tsa motlakase le tsa elektroniki, ‘me e bolela ka ho khetheha hore likahare tsa pele li ke ke tsa feta 0.1%.