Nickel plating muaj peev xwm ntxiv durability, hardness, hluav taws xob conductivity thiab tshav kub tsis kam rau ib yam khoom, ntxiv rau tiv thaiv corrosion thiab txhim khu nws zoo nkauj thov. Ua ntej tau txais kev pabcuam electroplating los ntawm cov txheej txheem hlau, koj yuav tsum xub txiav txim siab ntawm ob txoj kev plating: electrolytic plating lossis electroless plating. Electrolytic plating yuav tsum muaj hluav taws xob los yog tam sim no ncaj qha los pib cov tshuaj tiv thaiv da dej, uas cov khoom plated yog raus. Electroless npib tsib xee plating (tseem hu ua autocatalytic txheej) tsis tas yuav muaj hluav taws xob tam sim no lossis kev hloov pauv, es tsis txhob, phosphorus yog siv los ua cov tshuaj txo cov tshuaj hauv cov tshuaj formulations, thiab ob txoj kev muaj tib yam khoom kawg.
Dab tsi yog electrolysis thiab electroless nickel plating?
Ib txwm siv electrolytic npib tsib xee plating yuav tsum muaj cov khoom siv hluav taws xob thiab cov nqi hluav taws xob ncaj qha (DC) los pib cov tshuaj tiv thaiv kab mob rau cov khoom siv (substrate) nrog cov txheej nyias ntawm cov npib tsib xee. Txawm li cas los xij, electroless npib tsib xee plating tsis xav tau cov khoom siv hluav taws xob lossis hluav taws xob. Nyob rau hauv sib piv, electroplated formulations muaj xws li ib tug tshuaj txo tus neeg sawv cev (phosphorus) uas tso cai rau tus neeg siv los coated lub substrate yam tsis tas yuav ua ntxiv. Electrolytic npib tsib xee plating siv lub catalyst thiab tus nqi ncaj qha tam sim no los tsim cov tshuaj saw hlau cov tshuaj tiv thaiv uas coats cov khoom nrog ib txheej ntawm nickel. Electroless npib tsib xee plating, ntawm qhov tod tes, tsis xav tau lub catalyst lossis nqi. Hloov chaw, nws siv lwm txoj hauv kev xws li tshuaj txo cov neeg ua haujlwm, feem ntau yog phosphorus.
Ob txoj kev ntxiv txheej nyias ntawm nickel rau lub hom phiaj nto, tab sis electroless npib tsib xee plating muab ntxiv hnav thiab corrosion kuj, lubricity, thiab auxiliary kev ua tau zoo yam ntxwv piv rau electrolytic nickel plating. Electroless npib tsib xee plating, tseem hu ua autocatalytic txheej, tuaj yeem siv rau hauv cov haujlwm uas muaj kev tiv thaiv nruj nruj thiab yooj yim siv rau hauv cov khaubncaws sab nraud povtseg. Electrolytic npib tsib xee plating feem ntau yog tuab ntawm qhov kawg ntawm lub ntsej muag thiab cov npoo ntawm lub cev muaj zog thiab tsis muab tib theem ntawm qhov tseeb. Nyob rau hauv cov txheej txheem electrolytic plating, qhov deposition ceev yog tswj los ntawm lub sij hawm ntev ntawm cov khoom yog immersed thiab tus naj npawb ntawm amperes thov ib square feet.
Nickel plating txheej txheem
Ua ntej nickel plating, lub substrate yuav tsum tau ntxuav thiab pretreated, uas nws txawv nyob ntawm seb hom substrate thiab lub hom phiaj ntawm kev siv cov khoom. Tom ntej no, cov khoom yog muab tso rau hauv ib tug electroplating cell uas muaj qhov zoo them nqi yaj nickel-phosphorus. Lub substrate tau txais txiaj ntsig zoo ntawm nickel ions rau nws qhov chaw, tsim kom muaj txheej txheej zoo. Electroless npib tsib xee plating tsis xav tau hluav taws xob thiab tsis tas yuav tsum tau lim kom tsis txhob muaj cov khib nyiab los ntawm adhering rau saum npoo.
Qhov zoo ntawm electroless nickel plating
Electroless npib tsib xee plating muaj ntau qhov zoo dua li cov pa electrolytic nickel plating, suav nrog: Ntau qhov sib txawv ntawm cov khoom sib txawv: electroless npib tsib xee plating yog qhov tseeb dua li electrolytic plating nrog rau qhov siab ntawm ntxiv /- 0.001 hli. Nws tuaj yeem siv los tswj cov geometries nyuaj thiab tsis txhob muaj teeb meem tshwm sim hu ua "dog pob txha nyhuv," uas tshwm sim thaum muaj ntau cov amperes ib square centimeter tau siv thaum lub sij hawm electrolytic plating, uas ua rau tsis zoo deposition.
Zoo heev corrosion kuj
Vim qhov kev taw qhia ntawm phosphorus rau hauv cov tshuaj, electroless npib tsib xee plating muab zoo corrosion kuj. Txhim kho electromagnetic shielding, phosphorus kuj muab cov hlau nplaum, ua rau cov txheej txheem hlau los tswj cov nyiaj electromagnetic cuam tshuam uas tshwm sim nyob ib ncig ntawm lub substrate. Cov yam ntxwv no tau ua pov thawj qhov tseem ceeb rau cov ntawv thov siv hluav taws xob.
Ntxiv hardness thiab durability
Electroless npib tsib xee plating deposits tuaj yeem kho cua sov rau kwv yees li 90 feem pua ntawm cov hardness tib yam li chromium, thiab tsawg phosphorus electroless npib tsib xee plating tuaj yeem ua tiav Rockwell hardness (RC) coatings mus txog 63. Hauv kev sib piv, Hom II ci npib tsib xee plating tsim los ntawm electrolytic plating muaj txheej hardness ntawm 50 ntxiv Rc.
Txhim kho lubricity
Electroless npib tsib xee plating kuj txo kev sib txhuam nrog lwm cov ntaub ntawv, uas txhim kho lubricity thiab txo qhov caws pliav. Electroless nickel coatings yog ntau malleable tshaj li cov pa nickel coatings thiab tsis tshua muaj kev tawg, tawg, los yog tawg nyob rau hauv kev ntxhov siab. Txawm li cas los xij, Hom I ntshiab npib tsib xee coatings muab ntau qhov ductility kom tau raws li lossis tshaj AMS2424 specification tsim los ntawm SAE. Cov txheej txheem ntau dua, electroless npib tsib xee plating tuaj yeem siv rau yuav luag tag nrho cov hlau substrates, thiab tsis muaj kev txwv ntawm lub thickness ntawm txheej, electroless npib tsib xee plating kuj yog ib qho kev xaiv zoo tshaj plaws rau cov khoom siv rov qab tom qab.
Electrolytic plating txheej txheem
Ib yam li electroless npib tsib xee plating, electrolytic plating kuj pib nrog kev tu thiab ua ntej kho lub substrate, thiab tom ntej no, cov khoom yog muab tso rau hauv ib da dej nrog ib tug conductive puag thiab zoo nqi npib tsib xee. Thaum cov khoom yog submerged, ib qho hluav taws xob sab nraud los yog rectifier yog siv rau kev daws. Cov nickel anode raug them kom lawv tso tawm ions txuas rau saum npoo ntawm substrate, yog li ua tiav cov txheej txheem plating. Qee qhov tsim nyog rau electroplating dua li electroless npib tsib xee plating, ntawm no yog qee qhov txiaj ntsig ntawm electrolytic plating:
Khoom siv purity: Electroplating tuaj yeem ua los ntawm 100 feem pua nickel, thaum electroless npib tsib xee plating yuav tsum tau phosphorus. Cov txheej txheem electroplating kuj tuaj yeem ua nrog lwm cov ntaub ntawv hlau, xws li tooj liab. Electrolytic plating feem ntau pheej yig dua li electroless npib tsib xee plating thiab tuaj yeem tsim cov txiaj ntsig siab dua nrog lub sijhawm luv luv, uas ua rau cov txheej txheem ua haujlwm me ntsis. Ntau qhov ntau ntawm nickel muab kev ua tau zoo dua li electroless nickel plating. Tom qab kev kho mob, cov nyiaj npib tsib xee tuaj yeem tiv taus kub txog 1,832 degree F.
