Yuav ua li cas nrog rau blackening ntawm lub puab txheej ntawm ib tug multi-txheej PCB board yog kuj yooj yim?

Lub luag haujlwm ntawm blackening: passivation ntawm tooj liab nto; txhim khu lub roughness ntawm lub puab txheej ntawm tooj liab ntawv ci, yog li txhim kho lub zog sib txuas ntawm epoxy resin PCB pawg thawj coj saib thiab sab hauv txheej ntawm tooj liab ntawv ci;

ipcb ib

Peel zog

Dub oxidation txoj kev rau txheej txheej sab hauv kho ntawm PCB multilayer board:

PCB multilayer board dub oxidation kev kho mob

PCB multilayer board xim av oxidation txoj kev

PCB multilayer board tsis tshua muaj kub blackening txoj kev

PCB multilayer board txais kev kub kub blackening txoj kev, lub puab txheej pawg thawj coj saib yuav ua rau kub siab (thermal stress), uas yuav ua rau cov txheej sib cais tom qab lamination los yog tawg ntawm lub puab tooj liab ntawv ci;

1. Xim av oxidation:

Cov khoom ntawm oxidation dub kev kho mob ntawm ntau txheej boards ntawm PCB manufacturers yog tsuas yog tooj liab oxide, tsis muaj thiaj li hu ua cuprous oxide. Nov yog qee qhov kev xav tsis zoo hauv kev lag luam. Tom qab ESCA (kev tshuaj ntsuam xyuas hluav taws xob tshwj xeeb), qhov sib txawv ntawm tooj liab atoms thiab oxygen atoms tuaj yeem txiav txim siab. Kev khi lub zog, qhov sib piv ntawm tooj liab atoms thiab oxygen atoms ntawm qhov chaw ntawm oxide; cov ntaub ntawv ntshiab thiab kev soj ntsuam xyuas ua pov thawj tias cov khoom ntawm blackening yog tooj liab oxide, thiab tsis muaj lwm yam khoom;

General muaj pes tsawg leeg ntawm blackening kua:

Oxidizing tus neeg sawv cev sodium chlorite

PH tsis txwv trisodium phosphate

Cov sodium hydroxide

Surfactant

Los yog yooj yim tooj liab carbonate ammonia tov (25% ammonia dej)

2. Cov ntaub ntawv ntsig txog

1. Peel zog (peel zog) 1oz tooj liab ntawv ci ntawm qhov ceev ntawm 2mm / min, qhov dav ntawm cov ntawv ci tooj liab yog 1/8 nti, thiab lub zog tensile yuav tsum ntau tshaj 5 phaus / nti

2. Oxide hnyav (oxide hnyav); tuaj yeem ntsuas los ntawm txoj kev gravimetric, feem ntau tswj ntawm 0.2-0.5mg / cm2

3. Cov yam tseem ceeb uas cuam tshuam rau lub zog tsim kua muag los ntawm kev txheeb xyuas qhov sib txawv (ANDVA: kev txheeb xyuas qhov sib txawv) yog:

① Cov concentration ntawm sodium hydroxide

② Cov concentration ntawm sodium chlorite

③ Kev sib cuam tshuam ntawm trisodium phosphate thiab lub sij hawm immersion

④ Kev sib cuam tshuam ntawm sodium chlorite thiab trisodium phosphate concentration

Lub zog tsim kua muag nyob ntawm qhov ntim ntawm cov resin mus rau cov qauv siv lead ua oxide, yog li nws kuj tseem cuam tshuam rau qhov cuam tshuam ntawm cov lamination thiab cov khoom muaj feem cuam tshuam ntawm cov resin pp.

Qhov ntev ntawm acicular crystals ntawm oxide yog 0.05mil (1-1.5um) raws li qhov zoo tshaj plaws, thiab lub zog tsim kua muag ntawm lub sijhawm no kuj tseem loj;