Tom qab peb tsim lubPCB pawg thawj coj saib, peb yuav tsum xaiv cov txheej txheem kho saum npoo ntawm lub rooj tsav xwm hauv Circuit Court.Cov txheej txheem kev kho saum npoo uas feem ntau siv ntawm lub rooj tsav xwm hauv Circuit Court yog HASL (txheej txheej tin txau), ENIG ( txheej txheem kub immersion), OSP (txheej txheem oxidation), thiab feem ntau siv nto peb yuav xaiv cov txheej txheem kho li cas?Cov txheej txheem kho PCB sib txawv muaj cov nqi sib txawv, thiab cov txiaj ntsig kawg kuj txawv.Koj tuaj yeem xaiv raws li qhov xwm txheej tiag tiag.Cia kuv qhia koj txog qhov zoo thiab qhov tsis zoo ntawm peb txoj kev kho deg sib txawv: HASL, ENIG, thiab OSP.
1. HASL (Nto tin txau txheej txheem)
Cov txheej txheem tin spray yog muab faib ua cov hmoov txhuas thiab cov hmoov txhuas tsis muaj hmoov txhuas.Cov txheej txheem tin spray yog txheej txheem tseem ceeb tshaj plaws hauv kev kho mob hauv xyoo 1980s.Tab sis tam sim no, tsawg dua thiab tsawg dua Circuit Court boards xaiv cov txheej txheem tin spray.Yog vim li cas yog lub rooj tsav xwm Circuit Court nyob rau hauv "me tab sis zoo heev" kev taw qhia.HASL txheej txheem yuav ua rau cov khoom siv tsis zoo, lub pob taw tes tin tivthaiv tshwm sim thaum vuam zooCov kev pabcuam PCB Assemblycog kom nrhiav tau cov qauv siab dua thiab thev naus laus zis rau kev tsim khoom zoo, ENIG thiab SOP txheej txheem kho saum npoo feem ntau raug xaiv.
Qhov zoo ntawm cov hmoov txhuas-txhaj tshuaj tin : Tus nqi qis dua, kev ua haujlwm vuam zoo heev, zoo dua cov cuab yeej siv zog thiab gloss tshaj li cov hmoov txhuas-txhaj tshuaj.
Disadvantages ntawm txhuas-txhaj tshuaj tin: txhuas-txhaj tshuaj tin muaj cov hlau hnyav hlau, uas tsis yog ib puag ncig zoo hauv kev tsim khoom thiab tsis tuaj yeem dhau qhov kev ntsuam xyuas ib puag ncig xws li ROHS.
Qhov zoo ntawm cov hlau lead-dawb tin spraying: 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.
Disadvantages ntawm txhuas-dawb tin spray: mechanical zog thiab gloss tsis zoo li txhuas-dawb tin spray.
Qhov tsis zoo ntawm HASL: Vim tias qhov chaw tiaj tus ntawm cov tin-txheej board tsis zoo, nws tsis haum rau cov pins uas muaj qhov khoob zoo thiab cov khoom me me.Tin hlaws yog yooj yim tsim nyob rau hauv PCBA ua, uas yog feem ntau yuav ua rau luv luv Circuit Court rau Cheebtsam nrog nplua qhov khoob.
2. ENIG(Kub-sinking txheej txheem)
Kub-sinking txheej txheem yog txheej txheem kev kho saum npoo av, uas yog siv los 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 Cheebtsam nrog me me solder pob qij txha.Reflow tuaj yeem rov ua dua ntau zaus yam tsis tas yuav txo nws txoj kev sib tw.Yuav siv tau los ua substrate rau COB hlau sib txuas.
Disadvantages ntawm ENIG: Tus nqi siab, vuam tsis zoo.Vim tias cov txheej txheem electroless npib tsib xee plating yog siv, nws yog ib qho yooj yim kom muaj teeb meem ntawm dub disk.Cov nickel txheej oxidizes dhau lub sijhawm, thiab kev ntseeg tau ntev yog qhov teeb meem.
3. OSP (kev tiv thaiv oxidation)
OSP yog ib zaj duab xis organic tsim tshuaj nyob rau saum npoo ntawm tooj liab liab.Cov yeeb yaj kiab no muaj kev tiv thaiv oxidation, tshav kub thiab noo noo, 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, uas yog sib npaug rau kev kho oxidation.Txawm li cas los xij, nyob rau tom qab kub kub soldering, cov yeeb yaj kiab tiv thaiv yuav tsum tau yooj yim tshem tawm los ntawm cov flux, thiab cov tooj liab huv si tuaj yeem ua ke tam sim ntawd nrog cov molten solder los tsim cov khoom 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 kev sib txuas ntawm qhov chaw ua haujlwm lossis kev txwv lub sijhawm cia, OSP txheej txheem yuav yog txheej txheem kho saum npoo zoo tshaj plaws.
Qhov zoo ntawm OSP:Nws muaj tag nrho cov txiaj ntsig ntawm cov tooj liab welding.Lub rooj tsavxwm tas sijhawm (peb lub hlis) kuj tuaj yeem rov ua dua, tab sis nws feem ntau txwv rau ib zaug.
Disadvantages ntawm OSP:OSP yog susceptible rau acid thiab av noo.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 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 hniav kom tshem tawm cov txheej txheem OSP qub kom tiv tauj 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 cov txheej txheem kho saum npoo ntawm HASL, ENIG thiab OSP Circuit Court boards.Koj tuaj yeem xaiv cov txheej txheem kho saum npoo los siv raws li kev siv tiag tiag ntawm lub rooj tsavxwm.
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Post lub sij hawm: Jan-31-2022