Ob peb lub luag haujlwm tseem ceeb ntawm hluav taws xob soldering hlau flux
1. Kev ua tshuaj lom neeg
Yuav kom ua tiav qhov sib koom ua ke zoo, cov khoom yuav tsum tau soldered yuav tsum muaj qhov tsis muaj oxide kiag li. Txawm li cas los xij, thaum cov hlau raug huab cua, nws tsim ib txheej oxide, uas tsis tuaj yeem ntxuav nrog cov kuab tshuaj ib txwm muaj. Hauv qhov no, nws yuav tsum tau tso siab rau cov tshuaj lom neeg sib cuam tshuam ntawm cov flux thiab oxide txheej. Tom qab cov flux tshem tawm cov oxide txheej, ib qho chaw huv ntawm cov khoom yuav tsum tau soldered tuaj yeem ua ke nrog cov solder.
Muaj ntau ntau cov tshuaj tua kab mob ntawm flux thiab oxide:
1. Kev tsim cov khoom thib peb los ntawm kev sib cuam tshuam tshuaj lom neeg;
2. Cov oxide yog ncaj qha tev tawm los ntawm cov flux;
3. Ob qho kev tshwm sim saum toj no ua ke.
Rosin flux tshem tawm oxide txheej, uas yog thawj cov tshuaj tiv thaiv. Cov khoom tseem ceeb ntawm rosin yog AbieticAcid thiab Isomeric diterpene acids. Thaum lub flux yog rhuab, nws reacts nrog tooj liab oxide los ua Copperabiet, uas yog ib tug ntsuab pob tshab tshuaj uas yooj yim yaj mus rau hauv unreacted rosin thiab raug tshem tawm ua ke nrog rosin. Txawm tias muaj residue, nws yuav tsis corrode cov hlau nto.
Cov tshuaj tiv thaiv ntawm oxides raug rau cov pa roj hydrogen yog cov tshuaj tiv thaiv thib ob, qhov twg hydrogen reacts nrog oxygen ntawm qhov kub thiab txias los tsim dej, txo cov oxides. Txoj kev no feem ntau siv rau hauv kev sib txuas ntawm cov khoom siv semiconductor.
Yuav luag txhua cov organic lossis inorganic acids muaj peev xwm tshem tawm cov oxides, tab sis feem ntau tsis tuaj yeem siv rau soldering. Ntxiv nrog rau kev ua haujlwm ntawm kev tshem tawm oxides, flux muaj lwm yam haujlwm uas yuav tsum tau xav txog thaum lub sijhawm ua haujlwm.
2. Thermal stability
Thaum cov flux tshem tawm cov tshuaj tiv thaiv oxide, nws tseem yuav tsum tau tsim cov yeeb yaj kiab tiv thaiv kom tsis txhob muaj oxidized dua kom txog thaum nws los rau hauv kev sib cuag nrog cov solder. Yog li cov flux yuav tsum muaj peev xwm tiv taus qhov kub thiab txias thiab yuav tsis decompose los yog evaporate ntawm qhov kub thiab txias ntawm kev ua haujlwm soldering. Yog tias nws decomposes, nws yuav tsim cov kuab tshuaj insoluble uas nyuaj los ntxuav nrog cov kuab tshuaj. Ntshiab rosin ntawm W / W qib yuav decompose nyob ib ncig ntawm 280 degree, uas yuav tsum tau them tshwj xeeb mloog mus rau.
3. Kev ua ntawm flux ntawm qhov kub sib txawv
Zoo flux tsis tsuas yog yuav tsum tau thermal stability, tab sis kuj nws cov kev ua ntawm txawv kub. Kev ua haujlwm ntawm flux yog tshem tawm oxides, uas feem ntau ua haujlwm zoo tshaj plaws ntawm qhov kub thiab txias, xws li RA flux. Tshwj tsis yog tias qhov ntsuas kub nce mus txog ib theem, chloride ions yuav tsis txiav txim siab los ntxuav cov oxides. Ntawm chav kawm, qhov ntsuas kub no yuav tsum nyob rau hauv qhov kub ntawm qhov kev ua haujlwm ntawm kev ua haujlwm.
Thaum qhov kub thiab txias heev, nws cov dej num kuj yuav raug txo. Piv txwv li, thaum rosin siab tshaj 600 ℉ (315 degree), yuav luag tsis muaj cov tshuaj tiv thaiv. Cov yam ntxwv no tseem tuaj yeem siv los ntxuav cov dej ntws los tiv thaiv corrosion. Txawm li cas los xij, kev saib xyuas tshwj xeeb yuav tsum tau them rau lub sijhawm cua sov thiab qhov kub thiab txias hauv daim ntawv thov kom ua kom huv si ua haujlwm.
