Chromate sealing kev kho mob ntawm lub tshuab nqus tsev electroplating hluav taws xob cua sov raj

Chromate sealing kev kho mob ntawm lub tshuab nqus tsev electroplating hluav taws xob cua sov raj

Kev kho tom qab plating Kev kho tom qab ntawm electroless npib tsib xee plating yog tsis muaj dab tsi ntau tshaj li cua sov kom tshem tawm hydrogen, nce hardness los txhim kho hnav tsis kam los yog txhim kho adhesion, los yog ntxiv kev kho mob los txhim kho corrosion. Cov txheej uas yuav tsum tau kho tom qab plating tsuas yog ib feem me me ntawm tag nrho cov txheej. Cov kev sim qhia tau hais tias txoj kev kho cua sov ntawm cov cua sov ntawm 200 degree rau ib teev kuj tau txais txiaj ntsig los txhim kho pitting corrosion tsis kam ntawm txheej. Cov cua kub ntawm qhov kub tsawg rau ib lub sij hawm luv luv tshem tawm cov hydrogen, thiab txuas ntxiv tswj cov qauv amorphous ntawm txheej. Chromate sealing kev kho mob yog ib txoj hauv kev yooj yim thiab siv tau los txhim kho cov xim tsis zoo ntawm electroless npib tsib xee plating txheej, ncua lub sij hawm ntsev tsuag tshuaj ntsuam thiab corrosion kuj.

Ib txwm txheej txheem specification rau lub tshuab nqus tsev electroplating hluav taws xob cua sov raj nrog pinholes los yog pits

Pinholes thiab pitting yog ringworm zoo li, thiab feem ntau ntawm lawv tshwm nyob rau hauv lub plating qhov chaw. Yog tias txheej txheej plating yog pos huab thiab nkig, nws qhia tau hais tias muaj ntau cov hlau impurities hauv cov txheej txheem plating thiab pH tus nqi siab dhau. Cov tshuaj plating yuav tsum tau lim thiab kho nrog 10 feem pua ​​sulfuric acid tov. Tus nqi pH ntawm da dej yog rau cov txheej txheem ib txwm muaj.

Muaj cov pinholes los yog pockmarks ntawm lub protruding qhov chaw ntawm lub workpiece los yog txheej ntawm cov npoo, uas tej zaum yuav tshwm sim los ntawm ntau yam txawv teb chaws hlau impurities, me ntsis boric acid, siab pH tus nqi ntawm cov plating tov los yog siab tam sim no ceev, thiab qhov siab tam sim no ceev ib feem ntawm lub workpiece nyob rau hauv lub cathode zaj duab xis. Tus nqi pH siab dhau lawm, uas ua rau tsim cov hydroxides lossis cov ntsev ntawm cov hlau sib txawv yooj yim txuas rau txheej.

Lub tshuab nqus tsev plating hluav taws xob cua sov raj muaj pinholes lossis pits

Thaum muaj ntau cov organic impurities nyob rau hauv cov tshuaj plating, muaj ntau pinholes thiab pits, thiab kev faib yog ntau uniform. Rau cov roj thiab cov organic impurities, nws tuaj yeem raug tshem tawm los ntawm activated carbon adsorption.

Muaj cov pinholes los yog pits ntawm lub txheej nyob rau sab sauv ntawm lub workpiece, uas feem ntau yog tshwm sim los ntawm sedimentation ntawm non-conductive suspended solids nrog high density muaj. Rau cov khoom siv, lawv tuaj yeem raug tshem tawm los ntawm kev pom.

Muaj cov pinholes hauv txhua qhov chaw ntawm qhov chaw, thiab cov pinholes thiab pits yog me me thiab sib npaug. Thaum cov npuas dej ntawm lub nplawm da dej tseem me me, nws qhia tau hais tias cov ntsiab lus ntawm cov tshuaj tiv thaiv pinhole hauv chav da dej tsis txaus, thiab qhov nro ntawm lub da dej tsis hloov kho. Nws yog tshwm sim los ntawm qhov tseeb tias cov npuas tsim los yog adsorbed ntawm lub interface ntawm lub workpiece thiab cov tshuaj tsis yooj yim tso tawm.

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