Yog vim li cas BGA solder pob qij txha nquag oxidation

Hauv kev ntim khoom siv hluav taws xob, BGA (Ball Grid Array) yog ib qho ntawm cov khoom siv hluav taws xob ntau tshaj plaws thiab tau siv dav hauv ntau yam khoom siv hluav taws xob ua haujlwm siab. Txawm li cas los xij, nyob rau hauv tus txheej txheem ntawm kev nkag siab, nws yog ib qho yooj yim mus ntsib cov teeb meem ntawm BGA solder pob qij txha tau yooj yim oxidized. Yog li ntawd yog vim li cas rau qhov no?

1. Vim li cas BGA cov pob qij txha tuaj yeem ua rau oxidation?
(1) Ib puag ncig yam tseem ceeb: Cov pa oxygen thiab noo noo hauv huab cua yog qhov tseem ceeb uas ua rau BGA solder pob qij txha rau oxidize. Yog hais tias cov pob qij txha raug rau saum huab cua ntev dhau lawm, los yog lub ambient humidity siab dhau thaum lub sij hawm cia thiab tsheb thauj mus los, qhov chaw ntawm cov pob qij txha yuav oxidize.
(2) Cov khoom tseem ceeb: Qhov sib txawv ntawm cov khoom siv tshuaj lom neeg ntawm cov khoom siv thiab cov khoom siv hauv qab kuj tuaj yeem ua rau kev sib koom ua ke oxidation. Piv txwv li, qee cov ntaub ntawv muaj kev cuam tshuam nrog oxygen hauv qee qhov chaw los tsim oxides.
Cov txheej txheem txheej txheem: Cov kev teeb tsa tsis raug ntawm cov txheej txheem vuam tsis zoo, xws li cov vuam kub siab heev thiab lub sijhawm vuam ntev, tuaj yeem ua rau oxidation ntau dhau ntawm qhov sib koom ua ke.

2. Yuav daws qhov teeb meem ntawm BGA solder joint oxidation li cas?

(1) Ntxuav nrog xab npum: Siv cov tshuaj ntxuav kom zoo thiab ntxuav cov txheej txheem kom tshem tawm cov oxide txheej ntawm BGA cov pob qij txha. Thaum xaiv tus neeg saib xyuas tu, qhov muaj pes tsawg leeg thiab kev siv tau ntawm tus neeg saib xyuas yuav tsum tau txiav txim siab kom tsis txhob muaj kev puas tsuaj rau cov pob qij txha lossis lwm yam khoom. Thaum lub sij hawm ntxuav, xyuas kom txaus rinsing thiab ziab kom tsis txhob muaj residues uas ua rau lwm yam kab mob los yog oxidation.

(2) Tus neeg saib xyuas kev kho deg: Siv cov tshuaj kho deg, xws li cov activators lossis deoxidizers, kom tshem tawm cov oxide txheej thiab kho qhov chaw ntawm BGA solder pob qij txha. Cov tshuaj no tuaj yeem hnov ​​​​mob nrog cov txheej txheem oxide thiab hloov mus rau hauv cov hlau uas tuaj yeem siv tau. Ua ntej siv tus neeg saib xyuas kev kho saum npoo, nyeem cov lus qhia cov khoom kom zoo thiab ua raws li kev pom zoo siv.

(3) Ntxiv flux: Thaum lub sij hawm soldering txheej txheem, ib tug tsim nyog tus nqi ntawm flux yuav muab ntxiv los pab tshem tawm cov oxide nyob rau saum npoo ntawm lub solder sib koom. Lub flux tuaj yeem txo qhov nro ntawm qhov sib koom ua ke thiab txhawb kev sib raug zoo ntawm cov pob solder thiab substrate. Nyob rau tib lub sijhawm, cov khoom xyaw nquag hauv cov flux kuj tuaj yeem cuam tshuam nrog cov oxide kom txo cov qib ntawm oxidation ntxiv.