Hauv kev tsim, cyanide-tooj liab-tin alloy plating tej zaum kuj ua rau kab mob los yog txawm tias yuav raug rho tawm ntawm txheej. Vim li cas qhov no tshwm sim? Nws muaj feem ntau li cov hauv qab no.
(1) Degreasing tsis ntxuav: Ib feem ntawm cov roj zaj duab xis uas tsis tau raug tshem tawm ua ntej plating cais cov hlau los ntawm cov plating kua. Nws cuam tshuam lub deposition ntawm metal ions nyob rau hauv lub cathode thiab txawm tias thaum nws loj, nws tsis tau txawm coated nrog hlau. Nrog thinner roj zaj duab xis qhov chaw, txawm yog hais tias lub plating nrog ib tug zoo saum npoo plating, nyob rau hauv qhov tseeb, tsis yog ib qho muaj zog daim ntawv cog lus. Nyob hauv qee qhov kev mob (kev ntxhov siab ntau dua los ntawm qhov hnyav ntawm lub plating, qhov kub nyhiab thiab siab tam sim no thaum chrome plating, muaj zog ntawm kev ua polishing thiab kub siab vim kev sib txhuam, thiab lwm yam), cov txheej ntau. Nws yuav poob tawm thaum nws loj heev. (2) Cov cawv ntawm kev hloov ntawm tooj liab: Ua ntej cov khoom plated, lawv yuav tsum tau hluav taws xob roj thiab cov kua qaub. Thaum cov kua tshuaj electrolytic thiab cov kua qaub kua qaub (acid) yuav muaj ib qho nyiaj ntawm cov liab impurities, nws yog ib qho yooj yim los hloov cov tooj liab rau ntawm cov hlau. Ua ke nrog ntawm no txheej ntawm tooj liab thiab matrix hlau yog tsis muaj zog. Hloov cov tooj liab tooj liab ntawm lub tooj liab yuav ua rau lub txheej kom muaj kev ntxhov siab li lub thickness nce. Thaum qhov kev nyuab siab loj txaus, lub txheej yuav ua rau ntawm lub substrate ua ke nrog cov txheej hloov los ua ib qho tshuaj los yog lub cheeb tsam loj heev. .
(3) Cov nyhuv ntawm evolution of hydrogen: Thaum lub sij hawm electroplating, hydrogen evolution yog ib qho tseem ceeb heev uas ua rau blistering ntawm lub txheej. Qhov no yog vim yog muaj cov kab nrib pleb thiab micropores ntawm lub hauv paus ntawm lub hauv paus hlau thaum lub caij electrolysis thiab electroplating txheej txheem, qee qhov nyiaj ntawm adsorbed hydrogen yuav nce. Nyob hauv cov electroplating ntawm tooj liab tins, yog tias cov dawb sodium cyanide ntsiab lus hauv plating da dej siab dhau los los yog cathode tamsim no ntau dhau lawm, ib qho loj ntawm hydrogen yuav precipitate rau ntawm cathode nto, thiab ib feem ntawm hydrogen yuav infiltrate los yog yuav tsum adsorbed ntawm lub hauv paus ntawm lub hauv paus hlau. Thiab tom qab ib txheej ntawm plating yog siv rau saum npoo ntawm hydrogen- los yog hydrogen-absorbing tshooj, thaum txheej yog coated thiab ambient kub nce, lub siab yog siv rau txheej thaum cog txeej, thiaj li hais tias txheej yog detached los ntawm substrate thiab protrudes. Foaming.
Txhawm rau txhawm rau txhim kho qhov zoo ntawm electroplating thiab tiv thaiv qhov teeb meem ntawm blistering ntawm txheej, feem ntau yuav tsum tau txais kev ntsuas. Thaum cov plated feem hluav taws xob ua ke, cov xim uas muaj xim ntsuab yuav tsum yog tus cathodically deoiled kom muaj kev ceev ntiag tug tam sim no thiab txo lub sij hawm degreasing; cov hlau matrix yuav tsum siv thawj cathode kom tshem tawm cov roj, thiab cov nram qab anode tshem cov roj, yog li ntawd tsis tsuas yog cov deoiling yuav zoo tuaj. Cov nyhuv tuaj yeem txo qhov tshwm sim ntawm hydrogen seepage.
Ntawm qhov tod tes, cov dawb sodium cyanide cov ntsiab lus hauv plating da dej yog siab dhau heev, thiab cathode ceev siv ceev heev, thiab thaum muaj ib qho dej loj ntawm hydrogen evolved nyob rau ntawm lub plated ib sab, ntxiv rau ua foaming ntawm plating txheej, txheej plating txheej tej zaum kuj yuav tshwm sim. Pinholes, pockets, airflow stripes thiab cov tsis muaj teeb meem hauv zos, yog li xyuam xim tswj kev ua luam dej, sodium cyanide cov ntsiab lus tsis tau siab, cathode qhov ceev ceev tsis tuaj yeem yuav loj heev, yog li tsis txo cov kev txuag tam sim no, kom tsis txhob coob tus evolution of hydrogen evolution ntawm lub txheej los ntawm cov teebmeem phom sij