PCB tekinoroji yekurapa kwepamusoro inoreva maitiro ekugadzira nemaoko dhizaini paPCB zvikamu uye magetsi ekubatanidza mapoinzi akasiyana nemakanika, emuviri uye makemikari zvimiro zve substrate. Chinangwa chayo ndechekuona solderability yakanaka kana magetsi ePCB. Nekuti mhangura inoita kunge iripo muchimiro cheokisi mumhepo, iyo inokanganisa zvakanyanya solderability uye magetsi ePCB, zvinodikanwa kuita kurapa kwepamusoro paPCB.

Parizvino, nzira dzakajairika dzekurapa kwepamusoro ndedzinotevera:

1. Kupisa kwemhepo

Pamusoro pePCB yakaputirwa nesimbi-lead solder yakanyungudutswa uye yakatsetseka nemhepo inopisa yakamanikidzwa (yakavhuvhuta flat) kuti iite jira rekupotera rinopesana necopper oxidation uye rinopa kunaka kunyungudika. Munguva yekupisa kwemhepo, solder nemhangura zvinoumba mhangura-tin simbi yesimbi pakusangana, uye ukobvu hunenge 1 kusvika 2 mils;

2. Organic Anti-oxidation (OSP)

Pamusoro pemhangura isina tsvina yakachena, iyo organic film inorimwa nemakemikari. Iyi firimu yefirimu ine anti-oxidation, kupisa kutyisa kupikisa, uye hunyoro hunodzivirira kuchengetedza mhangura kubva kune ngura (oxidation kana sulfidation, nezvimwewo) munzvimbo yakajairika; panguva imwecheteyo, inofanira kubatsirwa nyore nyore mune inotevera welding yepamusoro tembiricha Iyo inoyerera inokurumidza kubviswa kuti ifambise welding;

3. Electroless nickel gold

Iyo gobvu yenickel-goridhe alloy ine yakanaka magetsi emagetsi inoputirwa pamusoro pemhangura uye inogona kuchengetedza PCB kwenguva yakareba. Kusiyana neOSP, iyo inongoshandiswa se-anti-rust barrier layer, inogona kubatsira mukushandiswa kwenguva refu kwePCB uye kuwana kushanda kwakanaka kwemagetsi. Mukuwedzera, inewo kushivirira kune zvakatipoteredza izvo mamwe maitiro ekurapa kwepamusoro haana;

4. Kemikari Kunyudzwa Silver

Pakati peOSP uye electroless nickel / kunyudza goridhe, maitiro ari nyore uye nekukurumidza. Kana yaiswa mukupisa, kunyorova uye kusvibiswa, inogona kuramba ichipa kuita kwakanaka kwemagetsi uye kuchengetedza yakanaka solderability, asi inorasikirwa nekupenya kwayo. Nekuti hapana nickel pasi pe sirivheri layer, kunyudza sirivha haina kunaka kwemuviri kusimba kwe electroless nickel / kunyudza goridhe;

5. Electroplating nickel gold

Kondakita pamusoro pePCB anoiswa electroplated nereyi yenickel yobva yaiswa electroplated negold. Chinangwa chikuru chenickel plating ndechekudzivirira kupararira pakati pegoridhe nemhangura. Kune marudzi maviri e electroplated nickel goridhe: goridhe rakapfava (goridhe rakachena, goridhe rinoratidza kuti haritaridzike kupenya) uye yakaoma goridhe plating (iyo yepamusoro inotsvedza uye yakaoma, isingapfeki, ine cobalt nezvimwe zvinhu, uye pamusoro. inotaridzika kupenya). Ndarama yakapfava inonyanya kushandiswa kugadzira waya yegoridhe panguva yekurongedza chip; goridhe rakaomarara rinonyanya kushandiswa pakubatanidza magetsi munzvimbo dzisiri dzekutengesa (sezvigunwe zvegoridhe).

6. PCB yakasanganiswa pamusoro pekurapa tekinoroji

Sarudza nzira mbiri kana dzinopfuura dzekurapa pamusoro pekurapa kwepamusoro. Mafomu akajairwa ndeaya: Kunyudza Nickel Goridhe + Anti-oxidation, Electroplating Nickel Goridhe + Kunyudzwa Nickel Goridhe, Electroplating Nickel Goridhe + Kupisa Kwemhepo Kuenzana, Kunyudzwa Nickel Goridhe + Kupisa Kwemhepo Kuenzana.

Kupisa kwemhepo kuyera (lead-isina/inotungamira) ndiyo inonyanya kushandiswa uye yakachipa nzira yekurapa kwese kwepamusoro, asi ndapota teerera kune EU’s RoHS mirau.

RoHS: RoHS chiyero chinosungirwa chakagadzwa neEU mutemo. Zita rayo rakazara nderokuti “Kurambidzwa Kwezvinhu Zvinokuvadza” (Kurambidzwa Kwezvinhu Zvinokuvadza). Iyo chiyero chakaitwa zviri pamutemo musi waChikunguru 1, 2006, uye inonyanya kushandiswa kuenzanisa zvinhu uye kugadzirisa zviyero zvezvigadzirwa zvemagetsi nemagetsi, zvichiita kuti zvive nyore kune hutano hwevanhu uye kuchengetedzwa kwezvakatipoteredza. Chinangwa chechiyero ichi ndechekubvisa zvinhu zvitanhatu zvinosanganisira lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls uye polybrominated diphenyl ethers mumagetsi nemagetsi zvigadzirwa, uye inonyatso taura kuti zvinotungamira hazvigone kudarika 0.1%.