Udindo wa blackening: passivation ya mkuwa pamwamba; onjezerani kuuma kwapamwamba kwa mkati mwa zojambulazo zamkuwa, potero kumawonjezera mphamvu yolumikizana pakati pa epoxy resin. PCB bolodi ndi wosanjikiza wamkati wa zojambula zamkuwa;

Peel mphamvu

Njira yakuda ya oxidation yochizira mkati mwa PCB multilayer board:

PCB multilayer board black oxidation chithandizo

PCB multilayer board brown oxidation njira

PCB multilayer board otsika kutentha kwakuda njira

PCB multilayer bolodi utenga mkulu kutentha blackening njira, mkati wosanjikiza bolodi adzatulutsa mkulu kutentha kupsyinjika (matenthedwe nkhawa), amene angayambitse wosanjikiza kulekana pambuyo lamination kapena mng’alu wa mkati mkuwa zojambulazo;

1. Brown oxidation:

Chopangidwa ndi chithandizo chakuda chakuti oxidation chamagulu angapo osanjikiza opanga PCB makamaka ndi copper oxide, palibe chomwe chimatchedwa cuprous oxide. Izi ndi zina zolakwika m’makampani. Pambuyo pa ESCA (electro specific chemical analysis) kusanthula, kusiyana pakati pa maatomu amkuwa ndi maatomu okosijeni kungadziwike. Kumanga mphamvu, chiŵerengero pakati pa maatomu amkuwa ndi maatomu okosijeni pamwamba pa okusayidi; deta momveka bwino ndi kuwunika kuwunika kumatsimikizira kuti chinthu chakuda ndi oxide yamkuwa, ndipo palibe zigawo zina;

Zambiri zamadzimadzi akukuda:

Oxidizing agent sodium chlorite

PH yokhala ndi trisodium phosphate

Sodium hydroxide

Wopulumutsa

Kapena njira yoyambira yamkuwa ya carbonate ammonia (25% ammonia madzi)

2. Deta yoyenera

1. Mphamvu ya peel (mphamvu ya peel) 1oz zojambula zamkuwa pa liwiro la 2mm / min, m’lifupi mwazojambula zamkuwa ndi 1/8 inchi, ndipo mphamvu yamphamvu iyenera kukhala yopitilira 5 pounds / inchi.

2. Kulemera kwa okosijeni (kulemera kwa okusayidi); akhoza kuyesedwa ndi njira ya gravimetric, yomwe nthawi zambiri imayendetsedwa pa 0.2-0.5mg / cm2

3. Zinthu zazikulu zomwe zimakhudza mphamvu ya misozi kupyolera mu kusanthula koyenera kosinthika (ANDVA: kusanthula kwa kusintha) ndi:

①Kuchuluka kwa sodium hydroxide

②Kuchuluka kwa sodium chlorite

③Kulumikizana pakati pa trisodium phosphate ndi nthawi yomiza

④Kuyanjana pakati pa sodium chlorite ndi trisodium phosphate concentration

Mphamvu ya misozi imadalira kudzazidwa kwa utomoni ku mawonekedwe a oxide crystal, kotero imagwirizananso ndi magawo ofunikira a lamination ndi zofunikira za resin pp.

Kutalika kwa makristasi acicular a oxide ndi 0.05mil (1-1.5um) ngati abwino kwambiri, ndipo mphamvu yong’ambika panthawiyi imakhalanso yayikulu;