Yuav ua li cas xaiv PCB nto tiav txheej txheem

Tom qab peb tsim lub rooj tsavxwm PCB, peb yuav tsum xaiv cov txheej txheem kho saum npoo ntawm lub rooj tsavxwm. Tam sim no cov txheej txheem kev kho deg siv feem ntau ntawm lub rooj tsav xwm hauv Circuit Court muaj xws li HASL (txheej txheem txheej txheej saum npoo av), ENIG ( txheej txheem immersion kub), OSP ( txheej txheem tiv thaiv oxidation), thiab cov txheej txheem kev kho saum npoo uas siv ntau yog peb yuav xaiv cov txheej txheem ua li cas. ? Cov txheej txheem PCB sib txawv ntawm qhov chaw kho mob muaj qhov sib txawv. Koj tuaj yeem xaiv raws li qhov xwm txheej tiag tiag. Cov hauv qab no yog qhov zoo thiab qhov tsis zoo ntawm peb txoj kev kho deg sib txawv ntawm HASL, ENIG thiab OSP.

1. HASL (txheej txheem tin txheej txheem)

Cov txheej txheem tshuaj tsuag tin tau muab faib ua cov hmoov txhuas thiab cov hmoov txhuas tsis muaj hmoov txhuas. Cov txheej txheem tshuaj tsuag tin tau siv los ua cov txheej txheem kho saum npoo tseem ceeb tshaj plaws hauv xyoo 1980s, tab sis tam sim no, tsawg dua thiab tsawg dua Circuit Court boards xaiv cov txheej txheem tshuaj tsuag. Qhov laj thawj yog vim li cas lub rooj tsav xwm hauv Circuit Court yog tsim nyob rau hauv cov kev taw qhia ntawm "me me thiab refined". Cov txheej txheem tin txau yuav ua rau cov hlaws hlaws thaum vuam cov khoom zoo, thiab cov ntsiab lus ntawm cov hlau kheej kheej yuav ua rau cov khoom tsis zoo. Txhawm rau kom ua raws cov txheej txheem siab dua thiab Rau kev tsim khoom zoo, cov txheej txheem kho saum npoo ntawm ENIG thiab SOP feem ntau xaiv.

Qhov zoo ntawm cov hmoov txhuas-txhaj tshuaj tin yog: tus nqi qis dua, kev ua haujlwm vuam zoo heev, lub zog zoo dua qub thiab gloss dua li cov hmoov txhuas-txhaj tshuaj.

Qhov tsis zoo ntawm cov hmoov txhuas-txhaj tshuaj: cov hmoov txhuas-txhaj tshuaj muaj cov hlau hnyav hnyav, kev tsim khoom tsis zoo ib puag ncig, thiab tsis tuaj yeem dhau ROHS thiab lwm yam kev ntsuas kev tiv thaiv ib puag ncig.

Qhov zoo ntawm cov hmoov txhuas tsis muaj hmoov txhuas: tus nqi qis, kev ua haujlwm vuam zoo, thiab tus phooj ywg ib puag ncig, tuaj yeem dhau ROHS thiab lwm yam kev ntsuas kev tiv thaiv ib puag ncig.

Qhov tsis zoo ntawm cov hmoov txhuas tsis muaj hmoov txhuas: txhua yam muaj zog, gloss, thiab lwm yam tsis zoo li cov hmoov txhuas tsis muaj hmoov txhuas.

Qhov tsis zoo ntawm HASL: nws tsis haum rau cov pins nrog cov khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob Tin hlaws tau yooj yim tsim nyob rau hauv PCBA ua, uas muaj feem ntau yuav ua rau luv luv Circuit Court rau cov khoom uas muaj qhov tsis zoo.

2. ENIG (Immersion Gold Process)

Immersion kub txheej txheem yog txheej txheem kev kho saum npoo av, uas feem ntau yog siv rau ntawm cov laug cam nrog kev sib txuas ua haujlwm thiab lub sijhawm cia ntev ntawm qhov chaw.

Qhov zoo ntawm ENIG: Nws tsis yooj yim rau oxidize, tuaj yeem khaws cia rau lub sijhawm ntev, thiab muaj qhov tiaj tus. Nws yog tsim rau soldering fine-gap pins thiab cov khoom nrog me me solder pob qij txha. Reflow tuaj yeem rov ua dua ntau zaus yam tsis tau txo nws txoj kev ua haujlwm. Yuav siv tau los ua substrate rau COB hlau sib txuas.

Qhov tsis zoo ntawm ENIG: tus nqi siab, lub zog vuam tsis zoo, vim tias siv cov txheej txheem electroless nickel plating, nws yog ib qho yooj yim kom muaj teeb meem ntawm cov xim dub. Cov nickel txheej oxidizes lub sij hawm, thiab kev cia siab rau lub sij hawm ntev yog ib qho teeb meem.

3. OSP (Anti-Oxidation txheej txheem)

OSP yog cov yeeb yaj kiab organic tsim los ntawm cov tshuaj siv tshuaj nyob rau saum npoo ntawm tooj liab liab. Cov txheej ntawm zaj duab xis no muaj kev tiv thaiv oxidation, thermal shock resistance, ya raws, thiab yog siv los tiv thaiv tooj liab nto los ntawm xeb (oxidation los yog vulcanization, thiab lwm yam) nyob rau hauv ib puag ncig ib puag ncig; Nws yog sib npaug rau kev kho mob los tiv thaiv oxidation, tab sis nyob rau hauv qhov kub kub tom qab vuam, Cov zaj duab xis tiv thaiv, tig, yuav tsum tau yooj yim thiab sai sai tshem tawm los ntawm cov flux, thiab cov tooj liab huv si tuaj yeem tam sim ntawd sib txuas nrog cov molten solder rau hauv ib qho. muaj zog sib koom ua ke hauv lub sijhawm luv luv. Tam sim no, qhov kev faib ua feem ntawm cov rooj tsav xwm hauv Circuit Court siv OSP txheej txheem kho qhov chaw tau nce ntau, vim tias cov txheej txheem no tsim nyog rau cov khoom siv hluav taws xob tsawg thiab cov khoom siv hluav taws xob siab. Yog tias tsis muaj qhov yuav tsum tau ua rau kev sib txuas ntawm qhov chaw lossis kev txwv lub sijhawm cia, OSP txheej txheem yuav yog qhov zoo tshaj plaws. txheej txheem kho saum npoo.

Qhov zoo ntawm OSP: Nws muaj tag nrho cov txiaj ntsig ntawm cov liab qab tooj liab board soldering, thiab cov laug cam uas tau tas sij hawm (peb lub hlis) kuj tuaj yeem rov ua dua, tab sis feem ntau tsuas yog ib zaug xwb.

Disadvantages ntawm OSP: susceptible rau acid thiab humidity. Thaum siv rau lwm qhov reflow soldering, nws yuav tsum tau ua kom tiav nyob rau hauv ib lub sij hawm ntawm lub sij hawm. Feem ntau, cov nyhuv ntawm qhov thib ob reflow soldering yuav tsis zoo. Yog tias lub sijhawm khaws cia ntau tshaj peb lub hlis, nws yuav tsum rov ua dua. Siv nyob rau hauv 24 teev tom qab qhib lub pob. OSP yog txheej txheej insulating, yog li qhov ntsuas qhov ntsuas yuav tsum tau muab luam tawm nrog cov tshuaj txhuam kom tshem tawm cov txheej txheem OSP los tiv thaiv tus pin point rau kev kuaj hluav taws xob. Cov txheej txheem sib dhos yuav tsum muaj kev hloov pauv loj, kev soj ntsuam cov khoom siv tooj liab tsis zoo rau ICT, dhau-tipped ICT probes tuaj yeem ua rau PCB puas, yuav tsum tau ceev faj, txwv tsis pub kuaj ICT thiab txo cov kev sim rov ua dua.

Cov saum toj no yog kev tsom xam ntawm HASL, ENIG, OSP Circuit Court board txheej txheem kev kho mob, txhua yam xav tau PCB, thov koj xav tiv tauj kuv.