Cov teeb meem dab tsi feem ntau ntsib thaum siv PCB nickel plating tov

Ntawm PCBs, npib tsib xee yog siv los ua cov txheej txheej substrate rau cov hlau muaj txiaj ntsig thiab hauv paus. PCB Cov txheej txheem kev ntxhov siab qis nickel feem ntau yog plated nrog hloov pauv Watt nickel da dej thiab qee qhov sulfamate nickel da dej nrog cov tshuaj ntxiv txo kev ntxhov siab.

1. Kub - cov txheej txheem nickel sib txawv siv cov dej da dej sib txawv. Nyob rau hauv cov tshuaj npib tsib xee plating nrog qhov kub thiab txias, qhov tau txais cov nickel txheej muaj kev ntxhov siab sab hauv thiab zoo ductility. Kev khiav hauj lwm kub yog tswj ntawm 55 txog 60 degrees. Yog tias qhov kub thiab txias dhau lawm, hydrolysis ntawm nickel ntsev yuav tshwm sim, ua rau pinholes hauv txheej thiab txo cov cathodic polarization.

2. PH tus nqi - PH tus nqi ntawm cov npib tsib xee plating electrolyte muaj kev cuam tshuam zoo rau kev ua haujlwm ntawm cov txheej txheej thiab cov electrolyte. Feem ntau, tus nqi pH ntawm PCB npib tsib xee plating electrolyte yog khaws cia ntawm 3 thiab 4. Nickel da dej nrog pH siab dua muaj zog dua dispersion thiab ntau dua cathode tam sim no efficiency. Txawm li cas los xij, yog tias pH siab dhau lawm, vim qhov kev hloov pauv tsis tu ncua ntawm hydrogen los ntawm cathode thaum lub sij hawm electroplating txheej txheem, thaum nws siab tshaj 6, pinholes yuav tshwm nyob rau hauv lub txheej. Cov nickel plating tov nrog qis pH muaj zoo dua anode dissolution, uas yuav ua rau kom cov ntsiab lus ntawm nickel ntsev nyob rau hauv electrolyte. Txawm li cas los xij, yog tias pH qis dhau lawm, qhov ntsuas kub kom tau txais cov txheej ci ntsa iab yuav raug nqaim. Ntxiv nickel carbonate lossis npib tsib xee carbonate, tus nqi pH nce; ntxiv sulfamic acid los yog sulfuric acid, pH tus nqi txo, xyuas thiab kho tus nqi pH txhua plaub teev thaum lub sijhawm ua haujlwm.

3. Anode - Cov pa nickel plating ntawm PCBs uas tuaj yeem pom tam sim no txhua tus siv cov anodes soluble, thiab feem ntau siv cov pob tawb titanium ua anodes nrog cov pob zeb nickel built-in. Lub pob tawb titanium yuav tsum tau muab tso rau hauv ib lub hnab anode ua los ntawm cov khoom siv polypropylene los tiv thaiv cov anode slime los ntawm kev poob rau hauv cov tshuaj plating, thiab yuav tsum tau ntxuav thiab xyuas tsis tu ncua kom pom tias lub qhov tsis muaj kev cuam tshuam.

4. Purification - Thaum muaj cov pa phem hauv cov tshuaj plating, nws yuav tsum tau kho nrog cov pa roj carbon activated. Txawm li cas los xij, txoj kev no feem ntau tshem tawm ib feem ntawm kev ntxhov siab (additive), uas yuav tsum tau muab ntxiv.

5. Kev Ntsuam Xyuas - Cov txheej txheem plating yuav tsum siv cov ntsiab lus tseem ceeb ntawm cov txheej txheem kev cai teev tseg los ntawm kev tswj cov txheej txheem, tsis tu ncua soj ntsuam cov txheej txheem ntawm cov txheej txheem plating thiab cov Hull cell test, thiab coj mus rau lub tuam tsev tsim khoom los kho qhov tsis zoo ntawm cov txheej txheem plating raws li cov txheej txheem. tau parameters.

6. Stirring - cov txheej txheem nickel plating yog tib yam li lwm cov txheej txheem electroplating. Lub hom phiaj ntawm kev nplawm yog txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txo qhov kev hloov pauv concentration thiab ua kom lub siab ntawm qhov tso cai tam sim no. Sib tov cov tshuaj plating kuj tseem muaj lub luag haujlwm tseem ceeb hauv kev txo lossis tiv thaiv cov pinholes hauv txheej npib tsib xee plating. Compressed cua, cathode txav thiab yuam kev ncig (ua ke nrog cov tub ntxhais carbon thiab paj rwb core filtration) feem ntau yog siv rau nplawm.

7. Cathode tam sim no ceev - Cathode tam sim no ntom muaj qhov cuam tshuam rau cathode tam sim no efficiency, deposition npaum li cas thiab txheej zoo. Thaum siv cov electrolyte nrog qis pH rau npib tsib xee plating, nyob rau hauv cov cheeb tsam uas tsis muaj tam sim no ceev, lub cathode tam sim no efficiency nce nrog qhov nce ntawm qhov ceev tam sim no; Nyob rau hauv lub siab tam sim no ceev cheeb tsam, lub cathode tam sim no efficiency tsis muaj dab tsi ua nrog rau qhov tam sim no ceev, thiab thaum siv ib tug ntau dua pH Lub cathodic tam sim no efficiency muaj me ntsis ua rau tam sim no ceev thaum electroplating nickel tov. Zoo li lwm hom plating, qhov ntau ntawm cathode tam sim no ceev xaiv rau npib tsib xee plating yuav tsum nyob ntawm seb muaj pes tsawg leeg, qhov kub thiab txias ntawm cov tshuaj electroplating.