Ntau tus neeg ua si DIY yuav pom tias ntau yam khoom lag luam ntawm lub khw siv ntau yam ntawm cov xim PCB.
Cov xim PCB ntau dua yog xim dub, ntsuab, xiav, daj, ntshav, liab, thiab xim av.
Qee cov tuam ntxhab tau tsim cov xim dawb, paj yeeb thiab lwm yam xim sib txawv ntawm PCB.

Nyob rau hauv cov kev xav ib txwm muaj, dub PCB zoo li tau muab tso rau ntawm qhov siab kawg, thaum liab, daj, thiab lwm yam, yog qhov qis kawg siab, puas yog?

Cov txheej tooj liab ntawm PCB tsis muaj cov txheej txheem oxidizes yooj yim thaum raug huab cua

Peb paub tias ob sab pem hauv ntej thiab nraub qaum ntawm PCB yog cov txheej tooj liab.Hauv kev tsim cov PCB, cov txheej tooj liab yuav muaj qhov du thiab tsis muaj kev tiv thaiv txawm tias nws yog tsim los ntawm kev ntxiv lossis rho tawm.

Txawm hais tias cov khoom siv tshuaj lom neeg ntawm tooj liab tsis zoo li txhuas, hlau, magnesium, tab sis nyob rau hauv lub xub ntiag ntawm dej, ntshiab tooj liab thiab oxygen tiv tauj yog ib qho yooj yim rau oxidized;
Vim tias muaj cov pa oxygen thiab dej vapor hauv huab cua, qhov chaw ntawm cov tooj liab ntshiab yuav raug oxidation cov tshuaj tiv thaiv sai tom qab kev sib cuag nrog huab cua.

Raws li lub thickness ntawm tooj liab txheej nyob rau hauv PCB yog heev nyias, oxidized tooj liab yuav dhau los ua ib tug tsis zoo conductor ntawm hluav taws xob, uas yuav zoo heev ua rau cov hluav taws xob kev ua tau zoo ntawm tag nrho cov PCB.

Txhawm rau tiv thaiv tooj liab oxidation, cais cov welded thiab tsis-welded qhov chaw ntawm PCB thaum vuam, thiab tiv thaiv qhov chaw ntawm PCB, engineers tsim ib txheej tshwj xeeb.
Cov txheej tuaj yeem siv tau yooj yim rau saum npoo ntawm PCB, tsim cov txheej txheem tiv thaiv ntawm qee qhov tuab thiab thaiv cov tooj liab los ntawm huab cua.
Cov txheej txheej no yog hu ua solder resistance txheej thiab cov khoom siv yog cov xim pleev xim.

Txij li thaum nws hu ua xim, yuav tsum muaj xim sib txawv.
Yog lawm, cov xim qub qub tuaj yeem tsis muaj xim thiab pob tshab, tab sis PCB feem ntau yuav tsum tau luam tawm ntawm lub rooj tsavxwm kom yooj yim kho thiab tsim khoom.

Cov xim pob tshab tuaj yeem pom tsuas yog xim PCB tom qab, yog li txawm tias nws yog tsim, kho lossis muag, qhov tsos tsis zoo.
Yog li engineers ntxiv ntau yam xim rau cov xim pleev xim los tsim cov xim dub lossis liab lossis xiav PCB.

 
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Dub PCBs yog ib qho nyuaj rau pom kev xaim, uas ua rau kev saib xyuas nyuaj

Los ntawm qhov kev pom no, cov xim ntawm PCB tsis muaj dab tsi ua rau qhov zoo ntawm PCB.
Qhov sib txawv ntawm PCB dub thiab xiav PCB, daj PCB thiab lwm yam xim PCB nyob rau hauv cov xim sib txawv ntawm cov xim xim ntawm cov txhuam hniav.

Yog tias PCB tsim thiab tsim ib yam nkaus, cov xim yuav tsis muaj kev cuam tshuam rau kev ua haujlwm, thiab nws yuav tsis muaj kev cuam tshuam rau cov cua sov dissipation.

Raws li cov PCB dub, nws cov kab hluav taws xob saum npoo yuav luag tag, ua rau muaj teeb meem loj rau kev kho tom qab, yog li nws yog xim tsis yooj yim rau kev tsim thiab siv.

Yog li ntawd, nyob rau hauv xyoo tas los no, tib neeg maj mam hloov kho, tso tseg kev siv cov xim dub tawv tawv, thiab siv cov xim ntsuab tsaus, tsaus xim av, xiav tsaus thiab lwm yam xim xim, lub hom phiaj yog los pab tsim thiab kho.

Hauv qhov no, peb tau qhia meej txog qhov teeb meem ntawm PCB xim.
Yog vim li cas rau qhov tsos ntawm "xim sawv cev lossis qib qis" yog vim cov tuam txhab nyiam siv cov PCB dub los ua cov khoom lag luam siab, thiab xim liab, xiav, ntsuab, daj thiab lwm yam khoom qis.

Txhawm rau ua kom tiav, cov khoom muab lub ntsiab lus rau cov xim, tsis yog xim muab lub ntsiab lus rau cov khoom.

Cov txiaj ntsig zoo li cas cov hlau zoo li kub, nyiaj muaj txiaj ntsig nrog PCB?
Cov xim yog qhov tseeb, cia peb tham txog cov hlau tseem ceeb ntawm PCB!
Qee cov tuam txhab lag luam hauv kev nce qib ntawm lawv cov khoom, yuav tshwj xeeb hais tias lawv cov khoom siv kub, nyiaj plating thiab lwm yam txheej txheem tshwj xeeb.
Yog li dab tsi yog kev siv cov txheej txheem no?

Qhov saum npoo ntawm PCB xav tau cov khoom siv vuam, thiab ib feem ntawm cov txheej tooj liab yuav tsum raug nthuav tawm rau vuam.
Cov khaubncaws sab nraud povtseg ntawm cov tooj liab no yog hu ua cov ntaub qhwv, thiab cov pawm feem ntau yog cov duab plaub lossis ncig thiab muaj thaj chaw me me.

Saum toj no, peb paub tias cov tooj liab siv hauv PCB tau yooj yim oxidized, yog li cov tooj liab ntawm cov ntaub so ntswg raug rau saum huab cua thaum siv cov xim pleev xim.

Yog hais tias cov tooj liab ntawm lub ncoo yog oxidized, nws tsis yog nyuaj rau vuam, tab sis kuj ua rau kom cov resistivity, uas cuam tshuam rau kev ua tau zoo ntawm cov khoom kawg.
Yog li cov engineers tau tuaj nrog txhua txoj hauv kev los tiv thaiv cov ntaub qhwv.
Xws li plating inert hlau kub, chemically npog lub nto nrog nyiaj, los yog npog tooj liab nrog ib tug tshwj xeeb tshuaj zaj duab xis los tiv thaiv kev sib cuag nrog huab cua.

Cov ntaub qhwv ntsej muag rau ntawm PCB, cov txheej tooj liab raug pom ncaj qha.
Qhov no yuav tsum tau tiv thaiv kom tsis txhob oxidized.

Los ntawm qhov kev pom no, txawm tias kub lossis nyiaj, lub hom phiaj ntawm cov txheej txheem nws tus kheej yog los tiv thaiv oxidation thiab tiv thaiv cov ntaub qhwv kom lawv tuaj yeem ua kom muaj txiaj ntsig zoo thaum lub sijhawm vuam tom ntej.

Txawm li cas los xij, kev siv cov hlau sib txawv yuav xav tau lub sijhawm cia thiab khaws cia ntawm PCB siv rau hauv cov chaw tsim khoom.
Yog li ntawd, PCB cov chaw tsim khoom feem ntau siv lub tshuab nqus tsev sealing rau pob PCB ua ntej ua tiav ntawm PCB ntau lawm thiab xa mus rau cov neeg siv khoom kom ntseeg tau tias tsis muaj kev puas tsuaj oxidation tshwm sim rau PCB rau qhov txwv.

Ua ntej lub Cheebtsam yog welded rau ntawm lub tshuab, lub rooj tsavxwm daim ntawv manufacturers kuj yuav tsum tau soj ntsuam cov degree ntawm oxidation ntawm PCB, tshem tawm oxidized PCB, thiab xyuas kom meej lub yield ntawm cov khoom zoo.
Cov neeg siv khoom kawg kom tau txais daim npav board, yog los ntawm ntau qhov kev sim, txawm tias tom qab siv sijhawm ntev, oxidation yuav luag tsuas yog tshwm sim hauv cov ntsaws thiab tshem tawm qhov txuas, thiab ntawm cov ntaub qhwv thiab tau welded Cheebtsam, tsis muaj kev cuam tshuam.

Txij li thaum qhov kev tiv thaiv ntawm cov nyiaj thiab kub yog qis dua, puas yuav siv cov hlau tshwj xeeb xws li nyiaj thiab kub txo cov cua sov thaum siv PCB?

Peb paub tias qhov tseem ceeb uas cuam tshuam rau tus nqi calorific yog hluav taws xob tsis kam.
Resistance thiab conductor nws tus kheej cov khoom, conductor cross-sectional cheeb tsam, ntev ntsig txog.
Pad nto hlau thickness yog txawm deb tsawg tshaj li 0.01 hli, yog hais tias siv OST (organic tiv thaiv zaj duab xis) kev kho mob ntawm lub ncoo, yuav tsis muaj ntau tshaj thickness.
Qhov kev tawm tsam pom los ntawm cov tuab me me no yuav luag xoom, lossis tseem tsis tuaj yeem suav, thiab yeej tsis cuam tshuam rau lub tshav kub.