Icho chinonyanya kukosha chinangwa chePCB chepamusoro kurapwa ndechekuona yakanaka weldability kana zvinhu zvemagetsi.Nemhaka yokuti mhangura mumasikirwo inowanzove iripo mumhando ye oxides mumhepo, hazvibviri kuchengetedzwa semhangura yepakutanga kwenguva yakareba, saka inoda kurapwa nemhangura.
Kune akawanda PCB pamusoro pekurapa maitiro.Zvinhu zvakajairika ndeye flat, organic welded protective agents (OSP), yakazara -board nickel -plated goridhe, Shen Jin, Shenxi, Shenyin, makemikari nickel, goridhe, uye electroplating goridhe rakaomarara.Symptom.
1. Mhepo inopisa yakati sandara (spray tin)
Iyo yakajairika maitiro einopisa mhepo yekuyera maitiro ndeiyi: micro erosion → preheating → coating welding → spray tin → kuchenesa.
Mhepo inopisa yakati sandara, inozivikanwawo semhepo inopisa yakakwenenzverwa (inowanzozivikanwa seti tin spray), inova maitiro ekupfekedza tini rinonyunguduka (lead) rakaiswa paPCB pamusoro uye kushandisa kupisa kumanikidza kugadzirisa mhepo (kuvhuvhuta) kuumba. chikamu che anti-copper oxidation.Inogonawo kupa yakanaka weldability yekupfekedza machira.Iyo yose weld nemhangura yemhepo inopisa inogadzira copper -tin metal interductive compound pamusanganiswa.PCB inowanzonyura mumvura yakanyunguduka yakasungwa;banga remhepo rinofuridza mvura yakakandwa yakatsetseka yakanyoroveswa pamberi peyakasungwa;
Chiyero chemhepo inopisa chakakamurwa kuva marudzi maviri: vertical uye horizontal.Zvinowanzotendwa kuti horizontal type iri nani.Iyo inonyanya kuchinjika inopisa mhepo yekugadziridza layer ine yunifomu, iyo inogona kuwana otomatiki kugadzirwa.
Zvakanakira: nguva yakareba yekuchengetedza;mushure mokunge PCB yapera, pamusoro pemhangura yakanyorova zvachose (tin yakavharwa zvachose isati yaputirwa);zvakakodzera kupinza welding;mature process, mutengo wakaderera, wakakodzera kuongororwa kwekuona uye kuongororwa kwemagetsi
Zvakaipa: Hazvina kukodzera kusungirirwa kwemutsara;nekuda kwedambudziko rekupfava kwepamusoro, panewo zvinogumira paSMT;haikodzeri kuonana chinja dhizaini.Pakupfapfaidza tini, mhangura inonyungudika, uye bhodhi iri kupisa kwakanyanya.Kunyanya makobvu kana matete mahwendefa, tini pfapfaidzo ishoma, uye mashandiro ekugadzira haaite.
2, organic weldability inodzivirira (OSP)
Iyo general process ndeye: degreasing -> micro-etching -> pickling -> yakachena kuchenesa mvura -> organic coating -> kuchenesa, uye maitiro ekudzora ari nyore kuratidza maitiro ekurapa.
OSP inzira yekudhindwa bhodhi redunhu (PCB) yemhangura foil pamusoro pekurapa zvinoenderana nezvinodiwa zveRoHS rairo.OSP ipfupi kuOrganic Solderability Preservatives, inozivikanwawo se organic solderability preservatives, inozivikanwawo sePreflux muChirungu.Zvichitaurwa zviri nyore, OSP ikemikari yakakura organic ganda firimu panzvimbo yakachena, isina mhangura.Iyi firimu ine anti-oxidation, kupisa kutyisa, hunyoro kuramba, kuchengetedza nzvimbo yemhangura munzvimbo yakajairika haisisina ngura (oxidation kana vulcanization, nezvimwewo);Nekudaro, mune inotevera welding tembiricha yepamusoro, iyi firimu rinodzivirira rinofanira kubviswa nyore nyore nekuyerera nekukurumidza, kuitira kuti yakafumurwa yakachena mhangura pamusoro inogona kusanganiswa nekukurumidza neyakanyungudutswa solder munguva pfupi kwazvo kuti ive yakasimba solder joint.
Mabhenefiti: Iyo nzira iri nyore, iyo yepamusoro yakati sandara, inokodzera lead-isina welding uye SMT.Nyore kugadziridza, nyore kugadzira kugadzirwa, kwakakodzera kune yakachinjika mutsara mashandiro.Iro bhodhi rakakodzera kushandiswa kwakawanda (semuenzaniso OSP + ENIG).Mutengo wakaderera, ushamwari kwezvakatipoteredza.
Zvakaipa: kuganhurirwa kwenhamba ye reflow welding (yakawanda welding gobvu, iyo firimu ichaparadzwa, kazhinji kaviri pasina dambudziko).Haina kukodzera tekinoroji yecrimp, waya inosunga.Kuonekwa kwekuona uye kuona magetsi hakusi nyore.N2 gasi kuchengetedza inodiwa kune SMT.SMT rework haina kukodzera.High kuchengetedza zvinodiwa.
3, ndiro yese yakanamirwa nickel goridhe
Plate nickel plating ndiyo PCB yepasi conductor yakatanga kuputirwa nedhizaini yenickel yobva yaputirwa nedhaka regoridhe, nickel plating inonyanya kudzivirira kuparadzaniswa pakati pegoridhe nemhangura.Kune mhando mbiri dze electroplated nickel goridhe: yakapfava yegoridhe plating (yakachena goridhe, goridhe pamusoro hairatidzike kupenya) uye yakaoma goridhe plating (yakatsetseka uye yakaoma pamusoro, isingapfeki, ine zvimwe zvinhu zvakaita secobalt, nzvimbo yegoridhe inotaridzika kupenya).Ndarama yakapfava inonyanya kushandiswa kugadzira chip kurongedza waya yegoridhe;Ndarama yakaoma inonyanya kushandiswa mumagetsi asina-welded.
Zvakanakira: Nguva refu yekuchengetedza> 12 mwedzi.Inokodzera kuonana switch dhizaini uye yegoridhe waya inosunga.Inokodzera kuongororwa kwemagetsi
Kushaya simba: Kudhura kwakanyanya, goridhe rakakora.Electroplated zvigunwe zvinoda mamwe magadzirirwo waya conduction.Nekuti ukobvu hwegoridhe hahuenderane, kana huchiiswa kune welding, zvinogona kukonzera kumisikidzwa kweiyo solder joint nekuda kwegoridhe rakawandisa, kukanganisa simba.Electroplating surface uniformity dambudziko.Electroplated nickel gold haivhari kumucheto kwewaya.Haikodzeri aluminium wire bonding.
4. Sink goridhe
Iyo yakawanda maitiro ndeye: pickling kuchenesa -> micro-corrosion -> preleaching -> activation -> electroless nickel plating -> kemikari goridhe leaching;Kune matangi emakemikari matanhatu mukuita, anosanganisira angangoita zana marudzi emakemikari, uye maitiro acho akaomarara.
Ndarama inonyura yakaputirwa mune gobvu, remagetsi akanaka nickel goridhe alloy pamusoro pemhangura, iyo inogona kudzivirira PCB kwenguva yakareba;Mukuwedzera, inewo kushivirira kwezvakatipoteredza iyo mamwe maitiro ekurapa epamusoro haana.Mukuwedzera, kunyura kwegoridhe kunogonawo kudzivirira kuparara kwemhangura, iyo inobatsira gungano risina mutobvu.
Zvakanakira: hazvisi nyore kuita oxidize, inogona kuchengetwa kwenguva yakareba, nzvimbo yacho yakati sandara, yakanakira welding mapini epini uye zvikamu zvine majoini madiki e solder.Preferred PCB board ine mabhatani (seya nhare mbozha bhodhi).Reflow welding inogona kudzokororwa kakawanda pasina kurasikirwa kwakanyanya kwekugonesa.Inogona kushandiswa sechinhu chekutanga cheCOB (Chip On Board) wiring.
Kukanganisa: kudhura kwakanyanya, kusimba kusimba kwesimbi, nekuti kushandiswa kweiyo isiri-electroplated nickel process, zviri nyore kuve nematambudziko madema disk.Iyo nickel layer inogadzirisa nekufamba kwenguva, uye kuvimbika kwenguva refu inyaya.
5. Tini inonyura
Sezvo ese vatengesi vemazuva ano vari tin-based, iyo tin layer inogona kufananidzwa nechero rudzi rwe solder.Maitiro ekunyura tin anogona kuumba flat copper-tin metal intermetallic compounds, izvo zvinoita kuti tini riri kunyura rive neakanaka solderability semhepo inopisa inodzika pasina musoro furati dambudziko remhepo inopisa;Iyo ndiro yerata haigoni kuchengetwa kwenguva yakareba, uye gungano rinofanira kuitwa maererano nehurongwa hwekunyura kwetini.
Zvakanakira: Inokodzera kugadzirwa kwemitsara yakachinjika.Inokodzera kutsetseka mutsara kugadzirisa, yakakodzera lead-isina welding, kunyanya yakakodzera kune crimping tekinoroji.Yakanaka kwazvo flatness, yakakodzera SMT.
Zvakaipa: Mamiriro ezvinhu akanaka ekuchengetera anodiwa, pamwe isingadariki mwedzi mitanhatu, kudzora kukura kwendebvu.Haina kukodzera dhizaini yekuchinja.Mukuita kwekugadzira, iyo welding resistance film process yakakwira, zvikasadaro zvinokonzeresa kuti welding resistance firimu iwire pasi.Kune akawanda welding, N2 gasi kuchengetedza ndiyo yakanyanya kunaka.Kuyera kwemagetsi idambudziko zvakare.
6. Sirivha inonyura
Silver kunyura process iri pakati peorganic coating uye electroless nickel / goridhe plating, maitiro acho ari nyore uye nekukurumidza;Kunyangwe kana yaiswa mukupisa, hunyoro uye kusvibiswa, sirivheri ichiri kukwanisa kuchengetedza yakanaka weldability, asi icharasikirwa nekupenya kwayo.Silver plating haina simba rakanaka re electroless nickel plating/goridhe plating nekuti hapana nickel pasi pe sirivheri.
Zvakanakira: Yakareruka maitiro, akakodzera lead-isina welding, SMT.Yakanyanya flat surface, mutengo wakaderera, wakakodzera mitsetse yakanaka kwazvo.
Zvakaipa: Kuchengetedza kwakakwirira zvinodiwa, nyore kusvibisa.Welding simba rinowanzosangana nematambudziko (micro-cavity problem).Zviri nyore kuve ne electromigration phenomenon uye Javani bite phenomenon yemhangura pasi pewelding resistance film.Kuyera kwemagetsi idambudziko zvakare
7, makemikari nickel palladium
Zvichienzaniswa nekunaya kwegoridhe, pane imwezve palladium pakati penickel negoridhe, uye palladium inogona kudzivirira ngura inokonzerwa nekutsiviwa kwekuita uye kuita gadziriro yakazara yekunaya kwegoridhe.Ndarama yakavharwa zvakanyanya ne palladium, ichipa yakanaka yekubata kumeso.
Advantages: Inokodzera lead-isina welding.Yakanyanya flat surface, yakakodzera SMT.Kuburikidza nemakomba kunogonawo kuva nickel goridhe.Nguva refu yekuchengetedza, mamiriro ekuchengetedza haana hasha.Inokodzera kuongororwa kwemagetsi.Inokodzera kushandura dhizaini.Inokodzera aluminium waya inosunga, yakakodzera kune gobvu ndiro, yakasimba kuramba kurwiswa kwezvakatipoteredza.
8. Electroplating goridhe rakaoma
Kuti uvandudze kupikisa kupfeka kwechigadzirwa, wedzera nhamba yekuisa uye kubvisa uye electroplating goridhe rakaoma.
Kuchinja kwePCB pamusoro pekurapa kwepamusoro hakuna kunyanyokura, inoratidzika sechinhu chiri kure, asi zvinofanira kucherechedzwa kuti kuchinja kwenguva refu kunononoka kunotungamirira kukuchinja kukuru.Panyaya yekuwedzera kufona kwekuchengetedzwa kwezvakatipoteredza, maitiro ekurapa epamusoro ePCB anozochinja zvakanyanya mune ramangwana.
Nguva yekutumira: Jul-05-2023