Karolo ea ho fifala: passivation ea bokaholimo ba koporo; ntlafatsa bokaholimo ba lesela le ka hare la foil ea koporo, ka hona ho matlafatsa matla a tlamahano lipakeng tsa resin ea epoxy. PCB boto le lera le ka hare la foil ea koporo;

Matla a letlalo

Mokhoa oa oxidation o motšo bakeng sa kalafo e akaretsang ea kahare ea PCB multilayer board:

PCB multilayer board kalafo ea oxidation e ntšo

PCB multilayer board sootho oxidation mokhoa

PCB multilayer boto e tlaase mocheso blackening mokhoa

PCB multilayer boto adopts phahameng mocheso blackening mokhoa, ka hare lera boto tla hlahisa phahameng mocheso khatello ea kelello (mogote khatello ea kelello), e ka ‘na etsa hore lera karohano ka mor’a lamination kapa petsoha ea ka hare koporo foil;

1. Brown oxidation:

Sehlahisoa sa kalafo ea oxidation e ntšo ea liboto tse nang le likarolo tse ngata tsa baetsi ba PCB haholo-holo ke koporo oxide, ha ho na seo ho thoeng ke cuprous oxide. Ena ke maikutlo a fosahetseng indastering. Kamora tlhahlobo ea ESCA (electro specific chemical analysis), phapang lipakeng tsa liathomo tsa koporo le liathomo tsa oksijene e ka khethoa. Matla a tlamang, karo-karolelano pakeng tsa liathomo tsa koporo le liathomo tsa oksijene holim’a oxide; lintlha tse hlakileng le tlhahlobo ea ho shebella li paka hore sehlahisoa sa blackening ke oxide ea koporo, ‘me ha ho na likarolo tse ling;

Sebopeho se akaretsang sa mokelikeli o motšo:

Moemeli oa oxidizing sodium chlorite

PH e sireletsa trisodium phosphate

Sodium hydroxide

Melekisi

Kapa tharollo ea motheo ea koporo ea carbonate ammonia (25% ea metsi a ammonia)

2. Lintlha tse amehang

1. Matla a peel (matla a peel) 1oz foil ea koporo ka lebelo la 2mm / min, bophara ba foil ea koporo ke 1/8 inch, ‘me matla a thata a lokela ho feta lik’hilograma tse 5 / inch.

2. Boima ba oxide (boima ba oxide); e ka lekanyetsoa ka mokhoa oa gravimetric, ka kakaretso o laoloa ho 0.2-0.5mg / cm2

3. Lintlha tsa bohlokoa tse amang matla a ho lla ka tlhahlobo e fapaneng e fapaneng (ANDVA: tlhahlobo ea phapang) ke:

① Bongata ba sodium hydroxide

②Motsoako oa sodium chlorite

③ Tšebelisano lipakeng tsa trisodium phosphate le nako ea ho qoelisoa

④ Tšebelisano lipakeng tsa sodium chlorite le trisodium phosphate concentration

Matla a ho taboha a itšetlehile ka ho tlatsoa ha resin ho sebopeho sa kristale ea oxide, kahoo e boetse e amana le litekanyo tse amehang tsa lamination le thepa e amehang ea resin maq.

Bolelele ba likristale tsa acicular tsa oxide ke 0.05mil (1-1.5um) e le tse molemo ka ho fetisisa, ‘me matla a ho taboha ka nako ena a boetse a batla a le maholo;