PCB Kev kho tshuab saum npoo yog hais txog cov txheej txheem ntawm kev tsim cov txheej txheem saum npoo ntawm PCB cov khoom thiab cov ntsiab lus sib txuas hluav taws xob uas txawv ntawm cov khoom siv kho tshuab, lub cev thiab tshuaj lom neeg ntawm lub substrate. Nws lub hom phiaj yog los xyuas kom meej zoo solderability lossis hluav taws xob khoom ntawm PCB. Vim tias tooj liab zoo li muaj nyob rau hauv daim ntawv ntawm oxides hauv huab cua, uas cuam tshuam rau cov khoom siv hluav taws xob thiab hluav taws xob ntawm PCB, nws yog qhov tsim nyog los ua qhov kev kho saum npoo ntawm PCB.

Tam sim no, cov txheej txheem kev kho saum npoo yog raws li hauv qab no:

1. Cua kub leveling

Qhov saum npoo ntawm PCB yog coated nrog molten tin-lead solder thiab flattened nrog rhuab compressed cua (tshuab tiaj) los tsim ib txheej txheej uas tiv taus tooj liab oxidation thiab muab zoo solderability. Thaum lub sij hawm cua kub leveling, lub solder thiab tooj liab tsim ib tug tooj liab-tin hlau compound nyob rau hauv lub hlws ris, thiab lub thickness yog hais txog 1 mus rau 2 mils;

2. Organic Anti-oxidation (OSP)

Ntawm qhov huv si tooj liab nto, ib zaj duab xis organic yog zus chemical. Cov txheej ntawm zaj duab xis no muaj kev tiv thaiv oxidation, kub poob tsis kam, thiab noo noo tiv thaiv cov tooj liab nto los ntawm xeb (oxidation los yog sulfidation, thiab lwm yam) nyob rau hauv ib puag ncig ib puag ncig; tib lub sij hawm, nws yuav tsum tau yooj yim pab nyob rau hauv lub tom ntej welding high kub Lub flux yog sai sai tshem tawm kom yooj yim vuam;

3. Electroless npib tsib xee kub

Ib txheej tuab ntawm npib tsib xee-kub alloy nrog cov khoom siv hluav taws xob zoo yog qhwv rau ntawm tooj liab thiab tuaj yeem tiv thaiv PCB rau lub sijhawm ntev. Tsis zoo li OSP, uas tsuas yog siv los ua cov txheej txheem tiv thaiv xeb, nws tuaj yeem siv tau rau kev siv PCB mus ntev thiab ua tiav cov khoom siv hluav taws xob zoo. Tsis tas li ntawd, nws kuj muaj kev zam rau ib puag ncig uas lwm cov txheej txheem kho deg tsis muaj;

4. Tshuaj Immersion Silver

Nruab nrab ntawm OSP thiab electroless nickel / immersion kub, cov txheej txheem yog yooj yim dua thiab sai dua. Thaum raug tshav kub, av noo thiab muaj kuab paug, nws tseem tuaj yeem muab hluav taws xob ua haujlwm zoo thiab tswj tau zoo solderability, tab sis nws yuav poob nws cov luster. Vim tias tsis muaj npib tsib xee hauv qab txheej nyiaj, immersion nyiaj tsis muaj lub zog zoo ntawm electroless npib tsib xee / immersion kub;

5. Electroplating npib tsib xee kub

Tus neeg xyuas pib ntawm PCB nto yog electroplated nrog ib txheej ntawm nickel thiab ces electroplated nrog ib txheej kub. Lub hom phiaj tseem ceeb ntawm nickel plating yog los tiv thaiv qhov sib txawv ntawm kub thiab tooj liab. Muaj ob hom electroplated npib tsib xee kub: mos kub plating (ntshiab kub, kub qhia tias nws tsis zoo li ci) thiab tawv kub plating (qhov saum npoo yog du thiab tawv, hnav-resistant, muaj cobalt thiab lwm yam khoom, thiab nto. zoo li ci dua). Mos kub yog siv rau kub hlau thaum lub sij hawm ntim ntim; tawv kub yog siv rau kev sib txuas hluav taws xob hauv qhov chaw uas tsis yog soldering (xws li cov ntiv tes kub).

6. PCB hybrid nto kho tshuab

Xaiv ob lossis ntau txoj kev kho saum npoo rau kev kho saum npoo. Cov ntaub ntawv muaj xws li: Immersion Nickel Kub + Anti-oxidation, Electroplating Nickel Kub + Immersion Nickel Kub, Electroplating Nickel Kub + Kub Cua Leveling, Immersion Nickel Kub + Kub Cua Leveling.

Kev ntsuas cua kub (tsis muaj txhuas / txhuas) yog txoj kev siv ntau tshaj plaws thiab pheej yig tshaj plaws ntawm txhua qhov kev kho saum npoo, tab sis thov ua tib zoo saib rau EU txoj cai RoHS.

RoHS: RoHS yog tus qauv tsim los ntawm EU txoj cai. Nws lub npe tag nrho yog “Txoj Cai Tiv Thaiv Cov Khoom Siv Hluav Taws Xob” (Txheej Txheem Cov Khoom Muaj Teeb Meem). Tus txheej txheem tau raug ua tiav thaum Lub Xya Hli 1, 2006, thiab feem ntau yog siv los tsim cov khoom siv thiab cov txheej txheem ntawm cov khoom siv hluav taws xob thiab hluav taws xob, ua rau nws muaj txiaj ntsig zoo rau tib neeg kev noj qab haus huv thiab kev tiv thaiv ib puag ncig. Lub hom phiaj ntawm tus qauv no yog tshem tawm rau 0.1 yam khoom xws li txhuas, mercury, cadmium, hexavalent chromium, polybrominated biphenyls thiab polybrominated diphenyl ethers hauv cov khoom siv hluav taws xob thiab hluav taws xob, thiab nws tshwj xeeb tshaj tawm tias cov ntsiab lus txhuas tsis tuaj yeem tshaj XNUMX%.