HauvSMTnto mount los ua ke txheej txheem, residual tshuaj yog tsim thaum lub sij hawm lubPCB sib dhossoldering tshwm sim los ntawm flux thiab solder muab tshuaj txhuam, uas muaj xws li ntau yam khoom: organic cov ntaub ntawv thiab decomposable ions.Cov ntaub ntawv organic muaj zog heev, thiab cov ions seem ntawm cov ntaub qhwv tuaj yeem ua rau luv luv.Tsis tas li ntawd, ntau yam residual tshuaj nyob rau hauvPCBAboard yog cov qias neeg thiab tsis ua tau raws li qhov xav tau ntawm kev huv ntawm tus neeg siv kawg.Yog li ntawd, nws yog inevitable los ntxuav lubPCBAlub rooj tsavxwm.Txawm li cas los xij,PCBA pawg thawj coj saibyuav tsum tsis txhob muab ntxuav tsis tu ncua, thiab cov kev cai nruj thiab ceev faj yuav tsum tau ua raws li thaum siv aPCBAtshuab ntxuav.
Nov yog cov lus piav qhia ntxaws txog qee qhov teeb meem tshwm sim thaum lub sijhawmPCBA pawg thawj coj saibtxheej txheem ntxuav:
Ua ntej, tom qab sib dhos thiab soldering ntawm lubluam tawm Circuit Board Cheebtsam, tu yuav tsum tau nqa tawm sai li sai tau kom tshem tawm cov seem seem, solder, thiab lwm yam kab mob los ntawm lub Circuit Court board (vim cov residual flux yuav maj mam harden lub sij hawm, tsim corrosive yam xws li hlau halide ntsev).Ntawm qhov tod tes, thaum ntxuav, nws yog ib qho tseem ceeb kom tsis txhob muaj kev puas tsuaj rau cov khoom siv los ntawm kev nkag mus rau hauv cov khoom siv hluav taws xob uas tsis raug kaw kom tsis txhob muaj kev puas tsuaj lossis latent kev puas tsuaj rau cov khoom.
Tom qab ntxuav cov khoom siv hluav taws xob hauv Circuit Court, lawv yuav tsum muab tso rau hauv qhov cub ntawm 40 ~ 50 ° C thiab ci rau 20 ~ 30 feeb, thiab cov khoom yuav tsum tsis txhob kov cov tes liab qab ua ntej lawv qhuav tag.Tsis tas li ntawd, cov txheej txheem ntxuav yuav tsum tsis txhob cuam tshuam raucov khoom siv hluav taws xob, markings, solder joints, thiab cov ntawv luam tawm Circuit Board
Post lub sij hawm: Jan-22-2024