1. Cua kub leveling siv rau ntawm qhov chaw ntawm PCB molten tin lead solder thiab rhuab compressed cua leveling ( tshuab pav ca) txheej txheem. Ua nws daim ntawv oxidation resistant txheej yuav muab tau zoo weldability. Cov cua kub solder thiab tooj liab tsim ib qho tooj liab-sikkim compound ntawm qhov sib txuas, nrog lub thickness ntawm kwv yees li 1 mus rau 2mil.
2. Organic Solderability Preservative (OSP) los ntawm kev cog qoob loo ntawm cov organic txheej ntawm cov tooj liab dawb huv. PCB multilayer zaj duab xis no muaj peev xwm tiv taus oxidation, kub poob, thiab noo noo los tiv thaiv tooj liab nto los ntawm xeb (oxidation los yog sulfurization, thiab lwm yam) nyob rau hauv ib txwm tej yam kev mob. Nyob rau tib lub sijhawm, tom qab vuam kub, vuam flux tau yooj yim tshem tawm sai.

3. Ni-au tshuaj coated tooj liab nto nrog tuab, zoo ni-au alloy hluav taws xob khoom los tiv thaiv PCB multilayer board. Lub sijhawm ntev, tsis zoo li OSP, uas tsuas yog siv los ua cov txheej txheem rustproof, nws tuaj yeem siv rau kev siv PCB mus ntev thiab tau txais lub zog zoo. Tsis tas li ntawd, nws muaj kev kam rau ib puag ncig uas lwm cov txheej txheem kho saum npoo tsis muaj.

4. Electroless nyiaj deposition ntawm OSP thiab electroless npib tsib xee / kub plating, PCB multilayer txheej txheem yog yooj yim thiab ceev.

Kev raug kub, av noo thiab muaj kuab paug ib puag ncig tseem muab hluav taws xob ua haujlwm zoo thiab zoo weldability, tab sis tarnish. Vim tias tsis muaj npib tsib xee hauv qab txheej nyiaj, cov nyiaj precipitated tsis muaj tag nrho lub cev zoo ntawm electroless npib tsib xee plating / kub immersion.

5.Tus neeg xyuas pib ntawm qhov chaw ntawm PCB multilayer board yog plated nrog npib tsib xee kub, ua ntej nrog ib txheej ntawm npib tsib xee thiab tom qab ntawd nrog ib txheej kub. Lub hom phiaj tseem ceeb ntawm nickel plating yog los tiv thaiv qhov sib txawv ntawm kub thiab tooj liab. Nws muaj ob hom nickel-plated kub: kub kub (ntshiab kub, uas txhais tau hais tias nws tsis zoo li ci) thiab tawv kub (nqus, nyuaj, hnav-resistant, cobalt thiab lwm yam uas zoo li ci ntsa iab). Mos kub yog siv rau chip ntim kub kab; Hard kub yog tsuas yog siv rau cov uas tsis yog-welded hluav taws xob interconnection.

6. PCB sib xyaw txheej txheej kho tshuab xaiv ob lossis ntau txoj hauv kev rau kev kho saum npoo, ntau txoj hauv kev yog: npib tsib xee kub tiv thaiv oxidation, npib tsib xee plating kub nag lossis daus npib tsib xee kub, npib tsib xee plating kub kub cua leveling, hnyav nickel thiab kub kub cua leveling. Txawm hais tias qhov kev hloov pauv ntawm PCB multilayer txheej txheem kev kho deg tsis tseem ceeb thiab zoo li tau txais kev hloov mus ntev yuav ua rau kev hloov pauv qeeb. Nrog rau qhov kev thov ntau ntxiv rau kev tiv thaiv ib puag ncig, thev naus laus zis thev naus laus zis ntawm PCB tau ua tiav yuav hloov pauv ntau yam yav tom ntej.