Pane zvikonzero zvitatu zvePCBA kuchenesa

1. Chitarisiko uye magetsi ekushanda zvinodiwa

Iyo yakanyanya intuitive mhedzisiro yezvinosvibisa paPCBA kutaridzika kwePCBA. Kana ikaiswa kana kushandiswa munzvimbo inotonhora uye ine mwando, panogona kunge paine kunyura kwehunyoro uye kuchena kwakasara. Nekuda kwekushandiswa kwakapararira kwemachipisi asina lead, micro-BGA, chip-level package (CSP) uye 0201 zvikamu muzvikamu, chinhambwe pakati pezvikamu nebhodhi chiri kuderera, saizi yebhodhi iri kuita diki, uye density yegungano iri. kuwedzera. Muchokwadi, kana iyo halide yakavanzwa pasi pechikamu kana haigone kucheneswa zvachose, kuchenesa kwenzvimbo kunogona kutungamirira kumigumisiro yakaipa nekuda kwekusunungurwa kwehalide. Izvi zvinogonawo kukonzera kukura kwe dendrite, izvo zvinogona kutungamirira kumatunhu mafupi. Kucheneswa kusina kunaka kwezvinosvibisa ion kunotungamirira kumatambudziko akawanda: kushomeka kwepasi, kuparara, uye conductive surface residues ichaita dendritic distribution (dendrites) pamusoro pebhodhi redunhu, zvichiita kuti pave nenharaunda pfupi, sezvinoratidzwa mumufananidzo.

Kutyisidzirwa kukuru kwekuvimbika kwemidziyo yemagetsi yemauto ndebvu dzemarata nesimbi dzakabatanidzwa. Dambudziko rinoramba riripo. Ndebvu nesimbi zvinosanganisirwa zvinozopedzisira zvakonzera dunhu pfupi. Munzvimbo dzine hunyoro uye nemagetsi, kana pane yakawandisa ion kusvibiswa pane zvikamu, zvinogona kukonzera matambudziko. Semuenzaniso, nekuda kwekukura kwe electrolytic tin ndebvu, kukora kwema conductor, kana kudzikiswa kwekudzivirira kwekudzivirira, wiring pabhodhi redunhu ichaita pfupi, sezvakaratidzwa mumufananidzo.

Kucheneswa kusina kunaka kwezvisina-ionic zvinosvibisa zvinogonawo kukonzera nhevedzano yezvinetso. Inogona kukonzera kusanamatira kwakashata kwebhodhi mask, kushomeka kwepini yekubatanidza, kukanganiswa kwemuviri, uye kusanamira zvakanaka kweiyo conformal coating kune zvinofamba zvikamu nemapulagi. Panguva imwecheteyo, kusvibiswa kusina-ionic kunogonawo kuvhara iyo ionic tsvina mairi, uye inogona kuvhara uye kutakura zvimwe zvakasara uye zvimwe zvinhu zvinokuvadza. Idzi inyaya dzisingagoni kufuratirwa.

2, Three anti-paint coating inoda

Kuita kuti rukuvhute ruvimbike, hutsanana hwepamusoro hwePCBA hunofanirwa kusangana nezvinodiwa zve IPC-A-610E-2010 level 3 standard. Resin inosara isina kucheneswa pamberi pekuputirwa kwepamusoro inogona kuita kuti chidziviriro chidzike, kana kuti chidziviriro chitsemuka; Iyo activator yakasara inogona kukonzera electrochemical migration pasi pejasi, zvichikonzera kukundikana kwekuvhara kwekuvhara kwekudzivirira. Zvidzidzo zvakaratidza kuti iyo coating bonding rate inogona kuwedzerwa ne50% nekuchenesa.

3, No kuchenesa kunodawo kucheneswa

Maererano nemitemo yemazuva ano, izwi rokuti "hapana-kuchena" rinoreva kuti zvakasara pabhodhi zvakachengeteka zvemakemikari, hazvizove nemigumisiro pabhodhi, uye zvinogona kuramba zviri pabhodhi. Nzira dzekuyedza dzakakosha senge corrosion yekuona, surface insulation resistance (SIR), electromigration, nezvimwe zvinonyanya kushandiswa kuona iyo halogen/halide zvirimo uye nekudaro kuchengetedzwa kwezvinhu zvisina kuchena mushure mekusangana. Nekudaro, kunyangwe kana isina-yakachena flux ine yakaderera yakasimba yemukati ikashandiswa, pachange paine zvimwe kana zvishoma zvakasara. Kune zvigadzirwa zvine kuvimbika kwepamusoro zvinodiwa, hapana masara kana zvimwe zvinosvibisa zvinotenderwa pabhodhi redunhu. Zvekushandisa zvechiuto, kunyangwe yakachena isina-yakachena michina yemagetsi inodiwa.