Muaj 3 lub laj thawj tseem ceeb rau kev ntxuav PCBA

1. Cov tsos thiab kev ua haujlwm ntawm hluav taws xob yuav tsum tau ua

Cov txiaj ntsig zoo tshaj plaws ntawm cov pa phem ntawm PCBA yog qhov pom ntawm PCBA. Yog tias muab tso rau los yog siv nyob rau hauv qhov kub thiab txias ib puag ncig, tej zaum yuav muaj noo noo nqus thiab residue whitening. Vim yog siv cov chips tsis muaj txhuas, micro-BGA, chip-theem pob (CSP) thiab 0201 cov khoom hauv cov khoom, qhov kev ncua deb ntawm cov khoom thiab lub rooj tsavxwm yog shrinking, qhov luaj li cas ntawm lub rooj tsavxwm tau me me, thiab kev sib dhos ceev yog nce. Qhov tseeb, yog tias lub halide tau muab zais hauv qab cov khoom siv lossis tsis tuaj yeem ntxuav tau tag nrho, kev tu hauv zos tuaj yeem ua rau muaj kev puas tsuaj loj vim qhov tso tawm ntawm halide. Qhov no tuaj yeem ua rau kev loj hlob dendrite, uas tuaj yeem ua rau luv luv Circuit Court. Kev tu tsis zoo ntawm cov khoom siv ion tsis zoo yuav ua rau muaj ntau yam teeb meem: qhov tsis zoo ntawm qhov tsis kam, corrosion, thiab cov khoom seem ntawm cov khoom siv yuav ua rau dendritic tis (dendrites) ntawm qhov chaw ntawm lub rooj tsav xwm Circuit Court, uas ua rau lub hauv paus luv luv Circuit Court, raws li qhia hauv daim duab.

Lub ntsiab kev hem thawj rau kev ntseeg siab ntawm cov tub rog cov khoom siv hluav taws xob yog cov tin whiskers thiab hlau intercompounds. Qhov teeb meem tshwm sim. Lub whiskers thiab hlau intercompounds thaum kawg yuav ua rau luv luv Circuit Court. Hauv qhov chaw ntub dej thiab muaj hluav taws xob, yog tias muaj cov kab mob ion ntau dhau ntawm cov khoom, nws tuaj yeem ua rau muaj teeb meem. Piv txwv li, vim kev loj hlob ntawm electrolytic tin whiskers, corrosion ntawm conductors, los yog txo cov rwb thaiv tsev tsis kam, cov hlau nyob rau hauv Circuit Court board yuav luv luv Circuit Court, raws li qhia nyob rau hauv daim duab.

Kev ntxuav tsis zoo ntawm cov pa phem uas tsis yog ionic tuaj yeem ua rau muaj teeb meem ntau. Tej zaum yuav ua rau tsis zoo adhesion ntawm lub rooj tsavxwm daim npog qhov ncauj, tsis zoo tus pin kev sib cuag ntawm lub connector, lub cev tsis zoo cuam tshuam, thiab tsis zoo adhesion ntawm lub conformal txheej rau txav qhov chaw thiab plugs. Nyob rau tib lub sijhawm, cov kab mob uas tsis yog-ionic kuj tseem tuaj yeem ntim cov kab mob ionic hauv nws, thiab tuaj yeem ntim thiab nqa lwm cov khoom seem thiab lwm yam khoom tsis zoo. Cov no yog cov teeb meem uas tsis tuaj yeem tsis quav ntsej.

2, Three anti-xim txheej xav tau

Txhawm rau ua kom cov txheej txheem txhim khu kev qha, kev huv huv ntawm PCBA yuav tsum ua raws li cov cai ntawm IPC-A-610E-2010 qib 3 tus qauv. Resin residue uas tsis tau ntxuav tawm ua ntej txheej txheej tuaj yeem ua rau cov txheej txheem tiv thaiv delaminate, lossis txheej tiv thaiv kom tawg; Tus activator residue yuav ua rau electrochemical tsiv teb tsaws nyob rau hauv lub txheej, uas ua rau tsis ua hauj lwm ntawm txheej rupture tiv thaiv. Cov kev tshawb fawb tau pom tias cov txheej txheem kev sib txuas tuaj yeem nce 50% los ntawm kev ntxuav.

3, No kev ntxuav kuj yuav tsum tau ntxuav

Raws li cov qauv tam sim no, lo lus "tsis huv" txhais tau hais tias cov khoom seem ntawm lub rooj tsavxwm muaj kev nyab xeeb, yuav tsis muaj kev cuam tshuam rau lub rooj tsavxwm, thiab tuaj yeem nyob hauv lub rooj tsavxwm. Cov kev kuaj tshwj xeeb xws li kev kuaj xyuas corrosion, qhov chaw rwb thaiv tsev tiv thaiv (SIR), electromigration, thiab lwm yam yog siv los txiav txim siab cov ntsiab lus halogen / halide thiab yog li kev nyab xeeb ntawm cov khoom tsis huv tom qab sib dhos. Txawm li cas los xij, txawm tias tsis muaj cov kua dej huv uas siv cov ntsiab lus tsawg, tseem yuav muaj ntau dua lossis tsawg dua. Rau cov khoom uas yuav tsum tau muaj kev ntseeg siab, tsis muaj residues los yog lwm yam kab mob raug tso cai nyob rau hauv lub Circuit Court board. Rau kev siv tub rog, txawm tias cov khoom siv hluav taws xob tsis huv yuav tsum tau huv.