PCB zvinodiwa kune isiri-electrolytic nickel coating

Iyo electroless nickel coating inofanirwa kuzadzisa akati wandei mabasa:

Gold dhipoziti pamusoro

Chinangwa chekupedzisira chedunhu ndechekugadzira hukama pakati pePCB uye zvikamu zvine simba remuviri uye maitiro akanaka emagetsi. Kana paine chero oxide kana kusvibiswa paPCB pamusoro, iyi soldered yekubatanidza haizoitike neyemazuva ano isina kusimba flux.

Goridhe rinogara richinaya pane nickel uye haizokonzerese panguva yekuchengetedza kwenguva refu. Zvakadaro, goridhe haridhure pane oxidized nickel, saka nickel inofanira kuramba yakachena pakati penickel bath nekunyungudika kwegoridhe. Nenzira iyi, chinodiwa chekutanga chenickel kugara usina oxidation kwenguva yakakwana kuti ubvumire kunaya kwegoridhe. Chikamu chakagadzira kugeza kwemakemikari kunyudza kubvumira 6-10% phosphorus yemukati mukunaya kwe nickel. Iyi phosphorous yemukati mune electroless nickel coating inoonekwa seyakangwarira chiyero chekudzora kwekugezera, oxide, uye zvemagetsi uye zvemuviri zvimiro.

neukukutu

Iyo isiri-electrolytic nickel coating surface inoshandiswa muzvishandiso zvakawanda zvinoda simba remuviri, senge mota dzekutakura mabearings. Zvido zvePCB zvakaomesesa zvakanyanya pane aya maapplication, asi ekubatanidza waya

(Wire-bonding), touch pad yekusangana mapoinzi, plug-in yekubatanidza (kumucheto-konikoni) uye kugadzirisa kusimba, imwe nhanho yekuomarara ichiri yakakosha. Kusunga waya kunoda kuomarara kwe nickel. Kana mutungamiri akakanganisa dhipoziti, kurasikirwa kwekukakavadzana kunogona kuitika, iyo inobatsira mutungamiri “kunyunguduka” kune substrate. Mufananidzo weSEM unoratidza kuti hapana kupinda mukati meiyo flat nickel/goridhe kana nickel/palladium (Pd)/goridhe.

Hunhu hwemagetsi

Nekuda kwekureruka kwayo kwekugadzira, mhangura ndiyo simbi inosarudzwa pakuumbwa kwedunhu. Iko conductivity yemhangura yakakwirira kudarika inenge yese simbi. Ndarama inewo yakanaka magetsi conductivity uye isarudzo yakakwana yekunze kwesimbi, nokuti maerekitironi anowanzoyerera pamusoro penzira inofambisa (“pamusoro” inobatsira).

Mhangura 1.7 µΩcm Goridhe 2.4 µΩcm Nickel 7.4 µΩcm Electroless nickel plating 55~90 µΩcm Kunyange zvazvo maitiro emagetsi emapuranga akawanda ekugadzira asingakanganisi ne nickel layer, nickel inogona kukanganisa maitiro emagetsi e-high-frequency signals. Iko kurasikirwa kwechiratidzo che microwave PCB kunogona kudarika zvakatemwa nemugadziri. Chiitiko ichi chinoenzana nehukobvu hwenickel- dunhu rinoda kupfuura nemu nickel kuti risvike majoini anotengeswa. Mune akawanda maapplication, chiratidzo chemagetsi chinogona kudzoserwa mukati meiyo dhizaini yekutsanangura nekutsanangura kuti nickel deposit iri pasi pe2.5 µm.

Bata kuramba

Kubata kupikisa kwakasiyana nekutengesa nekuti nickel / goridhe pamusoro inoramba isina unsolder mukati mehupenyu hwekupedzisira chigadzirwa. Nickel / goridhe inofanirwa kuchengetedza magetsi ekusangana kwekunze mushure mekuratidzwa kwenguva refu kwezvakatipoteredza. Bhuku raAntler ra1970 rinoratidza zvinodikanwa zvekusangana zvenickel/goridhe nzvimbo muhuwandu. Nzvimbo dzakasiyana-siyana dzekushandiswa kwekupedzisira dzinodzidzwa: 3 ″ 65 ° C, yakajairika tembiricha yepamusoro yemagetsi masisitimu anoshanda pakudziya kwekamuri, semakomputa; 125°C, tembiricha painofanirwa kushanda majoinidzani ese, anowanzo kutaurwa nezvekushandiswa kwechiuto; 200 ° C, tembiricha iyi iri kuramba ichinyanya kukosha pamidziyo yekubhururuka.”

Kune yakaderera tembiricha nharaunda, hapana nickel chipingamupinyi chinodiwa. Sezvo tembiricha inowedzera, huwandu hwenickel hunodiwa kudzivirira nickel / goridhe kutamisa hunowedzera.

Nickel barrier layer Kubata kunogutsa pa65°C Kubata kunogutsa pa125°C Kubata kunogutsa pa200°C 0.0 µm 100% 40% 0% 0.5 µm 100% 90% 5 µm% 2.0% 100% 100% 10% 4.0% 100% 100% µm % 60%