Lub hom phiaj tseem ceeb tshaj plaws ntawm PCB Kev kho saum npoo yog los xyuas kom zoo solderability lossis hluav taws xob khoom. Txij li thaum ntuj tooj liab nyiam nyob rau hauv daim ntawv ntawm oxides nyob rau hauv cov huab cua, nws tsis zoo li yuav nyob twj ywm raws li qub tooj liab rau lub sij hawm ntev, yog li lwm yam kev kho mob yuav tsum tau rau tooj liab.

1. Cua kub leveling (tin spraying) kub cua leveling, kuj hu ua cua kub solder leveling (feem ntau hu ua spraying tin), yog txheej txheem ntawm txheej molten tin (lead) solder rau saum npoo ntawm PCB thiab sizing ( tshuab) nws nrog cua sov compressed cua. Nws tsim cov txheej txheej uas tsis yog tsuas yog tiv taus tooj liab oxidation, tab sis kuj muab kev zoo solderability. Thaum lub sij hawm cua kub leveling, lub solder thiab tooj liab tsim ib tug tooj liab-tin intermetallic compound ntawm kev sib koom tes. Thaum lub PCB yog leveled nrog cua kub, nws yuav tsum tau submerged nyob rau hauv lub molten solder; rab riam cua tshuab cov kua nplaum ua ntej lub solder solidifies; rab riam cua tuaj yeem txo qhov meniscus ntawm cov solder rau ntawm tooj liab thiab tiv thaiv cov hlau los ntawm kev sib txuas.

2. Organic Solderability Preservative (OSP) OSP yog txheej txheem rau kev kho saum npoo ntawm cov ntawv luam tawm Circuit Board (PCB) tooj liab ntawv uas ua tau raws li qhov yuav tsum tau ua ntawm RoHS cov lus qhia. OSP yog lub npe luv ntawm Organic Solderability Preservatives, uas tau muab txhais ua Organic Solderability Preservatives hauv Suav, tseem hu ua Copper Protector, lossis Preflux hauv lus Askiv. Yooj yim muab tso, OSP yog tshuaj lom neeg loj hlob ib txheej ntawm cov organic zaj duab xis ntawm cov tooj liab dawb huv. Cov txheej ntawm zaj duab xis no muaj kev tiv thaiv oxidation, thermal poob siab tsis kam, thiab noo noo tiv thaiv qhov chaw ntawm tooj liab los ntawm xeb (oxidation los yog sulfidation, thiab lwm yam) nyob rau hauv ib puag ncig ib puag ncig; Tab sis nyob rau hauv lub tom ntej no welding kub kub, no hom ntawm kev tiv thaiv zaj duab xis yuav tsum yog heev yooj yim kom tshem tawm sai sai los ntawm cov flux, yog li hais tias tus nto huv si tooj liab yuav tsum tau tam sim ntawd ua ke nrog cov molten solder rau hauv ib tug muaj zog solder sib koom nyob rau hauv ib tug heev. lub sij hawm luv luv.

3. Tag nrho cov phaj yog plated nrog npib tsib xee thiab kub

Lub npib tsib xee-kub plating ntawm lub rooj tsavxwm yog los phaj txheej ntawm npib tsib xee rau ntawm qhov chaw ntawm PCB thiab tom qab ntawd ib txheej kub. Cov nickel plating feem ntau yog los tiv thaiv qhov sib txawv ntawm kub thiab tooj liab. Muaj ob hom electroplated npib tsib xee kub: mos kub plating (ntshiab kub, kub nto tsis zoo li ci) thiab tawv kub plating (qhov saum npoo yog du thiab tawv, hnav-resistant, muaj cobalt thiab lwm yam khoom, thiab kub nto. zoo li ci dua). Mos kub yog siv rau kub hlau thaum lub sij hawm ntim ntim; hard kub yog tsuas yog siv rau kev sib txuas hluav taws xob hauv cov cheeb tsam uas tsis yog welded.

4. Immersion kub Immersion kub yog txheej tuab ntawm npib tsib xee-kub alloy nrog cov khoom siv hluav taws xob zoo ntawm cov tooj liab, uas tuaj yeem tiv thaiv PCB rau lub sijhawm ntev; Tsis tas li ntawd, nws kuj muaj kev kam rau ib puag ncig uas lwm cov txheej txheem kho deg tsis muaj. Tsis tas li ntawd, immersion kub kuj tuaj yeem tiv thaiv kev tawg ntawm tooj liab, uas yuav muaj txiaj ntsig zoo rau kev sib dhos tsis muaj txhuas.

5. Immersion tin Txij li tag nrho cov tam sim no solders yog raws li tin, txheej tin tuaj yeem sib phim nrog txhua yam ntawm cov khoom siv. Cov txheej txheem tin-immersion tuaj yeem tsim ib lub tiaj tooj liab-tin intermetallic compound. Qhov no feature ua rau tin-immersion muaj tib zoo solderability li kub-cua leveling yam tsis muaj mob taub hau flatness teeb meem ntawm kub-air leveling; tin-immersion boards tsis tuaj yeem khaws cia ntev dhau, Kev sib dhos yuav tsum tau nqa tawm raws li qhov kev txiav txim ntawm lub tog raj kheej.

6. Immersion silver Immersion silver txheej txheem yog nruab nrab ntawm cov txheej txheem organic thiab electroless nickel / immersion kub. Cov txheej txheem yog qhov yooj yim thiab ceev; Txawm hais tias raug tshav kub, av noo thiab muaj kuab paug, nyiaj tseem tuaj yeem tswj tau zoo solderability. Tab sis nws yuav plam nws luster. Immersion nyiaj tsis muaj lub cev zoo ntawm electroless nickel / immersion kub vim tias tsis muaj npib tsib xee hauv qab txheej nyiaj.

7. Piv nrog rau immersion kub, tshuaj nickel palladium kub muaj ib txheej ntxiv ntawm palladium ntawm npib tsib xee thiab kub. Palladium tuaj yeem tiv thaiv corrosion los ntawm kev hloov pauv cov tshuaj tiv thaiv thiab ua kom tag nrho cov kev npaj rau immersion kub. Kub yog nruj nreem npog ntawm palladium, muab kev sib cuag zoo.

8. Hard kub electroplated nyob rau hauv thiaj li yuav txhim kho cov hnav tsis kam ntawm cov khoom thiab ua rau kom muaj pes tsawg leeg ntawm insertion thiab tshem tawm.