Ọrụ nke blackening: passivation nke elu ọla kọpa; welie elu adịghị ike nke oyi akwa dị n’ime nke foil ọla kọpa, si otú a na-eme ka ike njikọ dị n’etiti resin epoxy. PCB mbadamba na oyi akwa nke ime ọla kọpa;

Bee ike

Usoro oxidation ojii maka ọgwụgwọ ime oyi akwa izugbe nke bọọdụ multilayer PCB:

PCB multilayer bọọdụ ojii oxidation ọgwụgwọ

PCB multilayer bọọdụ aja aja oxidation usoro

PCB multilayer osisi obere okpomọkụ blackening usoro

PCB multilayer osisi adopts elu okpomọkụ blackening usoro, n’ime oyi akwa osisi ga-emepụta elu okpomọkụ nchegbu (thermal stress), nke nwere ike ime ka oyi akwa nkewa mgbe lamination ma ọ bụ mgbape nke n’ime ọla kọpa foil;

1. oxidation Brown:

Ngwaahịa nke ọgwụgwọ oxidation ojii nke mbadamba multi-layer nke ndị na-emepụta PCB bụ tumadi ọla kọpa oxide, ọ nweghị ihe a na-akpọ cuprous oxide. Nke a bụ ụfọdụ echiche na-ezighị ezi na ụlọ ọrụ. Mgbe nyocha nke ESCA (electro specific chemical analysis), enwere ike ikpebi ọdịiche dị n’etiti atom ọla kọpa na ikuku oxygen. Ejikọ ike, oke n’etiti ọla kọpa atọm na ikuku oxygen n’elu nke oxide; data doro anya na nyocha nyocha na-egosi na ngwaahịa nke blackening bụ ọla kọpa oxide, ọ dịghịkwa ihe ndị ọzọ;

Ngwakọta izugbe nke mmiri mmiri blackening:

Ihe na-akpata oxidizing sodium chlorite

PH buffer trisodium phosphate

Sodium hydroxide

Ogbu mmiri

Ma ọ bụ isi ọla kọpa carbonate ngwọta amonia (25% mmiri amonia)

2. Dị mkpa data

1. Peel ike (ike peel) 1oz ọla kọpa foil na ọsọ nke 2mm / min, obosara nke foil ọla kọpa bụ 1/8 inch, na ike nkwụsị kwesịrị ịbụ karịa 5 pound / inch.

2. Oke oxide (oke oxide); enwere ike tụọ ya site na usoro gravimetric, nke a na-achịkwakarị na 0.2-0.5mg/cm2

3. Ihe ndị dị mkpa na-emetụta ike anya mmiri site na nyocha mgbanwe dị mkpa (ANDVA: nyocha nke mgbanwe) bụ:

①Mkpụrụ nke sodium hydroxide

②Mkpụrụ nke sodium chlorite

③ Mmekọrịta dị n’etiti trisodium phosphate na oge imikpu

④ Mmekọrịta dị n’etiti sodium chlorite na trisodium phosphate itinye uche

Ike akwa akwa na-adabere na njuputa resin na nhazi kristal oxide, ya mere ọ na-ejikọta ya na ihe ndị dị mkpa nke lamination na ihe ndị dị mkpa nke resin pp.

Ogologo kristal acicular nke oxide bụ 0.05mil (1-1.5um) dị ka nke kachasị mma, na ike ndọka n’oge a dịkwa oke;