Dab tsi yog qhov cuam tshuam ntawm cov hlau impurities hauv chromium plating tov ntawm hluav taws xob cua sov raj ntawm cov txheej txheem chromium plating
Tso lus
Dab tsi yog qhov cuam tshuam ntawm cov hlau impurities hauv chromium plating tov ntawm hluav taws xob cua sov raj ntawm cov txheej txheem chromium plating
76. Dab tsi yog qhov cuam tshuam ntawm cov hlau impurities hauv cov tshuaj chromium plating ntawm cov txheej txheem chromium plating thiab yuav ua li cas?
Teb: Cov hlau tsis huv hauv chromium plating electrolyte yog hlau ions xws li hlau, tooj liab, thiab zinc. Vim lub fact tias cov hlau thiab tooj liab qhov chaw poob rau hauv lub plating da dej thaum lub sij hawm chromium plating, nrog rau kev sib cais ntawm hlau nyob rau hauv lub pits thiab puab qhov ntawm lub plating qhov chaw, impurities xws li hlau thiab tooj liab yog inevitably muaj nyob rau hauv cov tshuaj chromium plating. . Cov ntsiab lus siab tshaj plaws ntawm cov hlau yog 8 grams / liter, qhov siab tshaj plaws ntawm tooj liab yog 5 grams / liter, thiab cov ntsiab lus siab tshaj plaws ntawm zinc yog 3 grams / liter. Cov yam ntxwv ntawm cov electrolytes uas muaj cov hlau loj yog tias nws yog ib qho nyuaj rau kev tswj xyuas qhov ruaj khov ntawm qhov tam sim no, thiab qhov tam sim no hloov tas li. Yog li, nws tsis tuaj yeem txiav txim siab ua haujlwm tshwj xeeb rau plating glossy chromium txheej. Ntxiv mus, thaum cov ntsiab lus ntawm cov hlau yog siab, nws muaj cov nyhuv tib yam li trivalent chromium. Nws txo cov conductivity ntawm cov electrolyte, deteriorates lub dispersion muaj peev xwm, thiab nqaim txoj hauj lwm ntau yam ntawm tau txais ib tug glossy chromium txheej. Txawm li cas los xij, nws cov nyhuv tsis muaj zog dua li trivalent chromium. Tshem cov hlau impurities los ntawm chromium plating electrolyte tsis yooj yim li tshem tawm trivalent chromium. Kev siv cov txheej txheem tshuaj yog cumbersome thiab inefficient. Tam sim no, muaj zog acidic cation txauv resins muaj rau kev tshem tawm hlau, thiab lawv cov txiaj ntsig zoo. Lwm yam hlau impurities xws li tooj liab, zinc, npib tsib xee, tin, thiab lwm yam kuj muaj cov teebmeem zoo li hlau.
77. Yog tias muaj cov chloride ions nyob rau hauv chromium plating electrolyte, nws yuav cuam tshuam dab tsi thiab yuav tshem tawm lawv li cas?
Teb: Cov tshuaj chloride ions nyob rau hauv chromium plating electrolyte yog tshwm sim los ntawm cov ntsiab lus chlorine siab nyob rau hauv kais dej los yog tsis zoo tu ntawm lub workpiece tom qab hydrochloric acid etching. Thaum cov chloride ion cov ntsiab lus siab dua 0.3-0.5 grams / liter, qhov tam sim no efficiency thiab sib sib zog nqus plating muaj peev xwm ntawm cov tshuaj raug txo, thiab cov txheej yuav tsaus, speckled, pinholes, thiab corrosion. tsis kam yog txo. Tsis muaj txoj hauv kev zoo los tshem tawm cov tshuaj chloride ions, thiab kev kho electrolytic tuaj yeem siv tau, tab sis nws nyuaj rau tshem tawm tag nrho, yog li nws yuav tsum zam kom ntau li ntau tau. Txhawm rau tiv thaiv kev cuam tshuam los ntawm chloride ions, kev saib xyuas yuav tsum tau them rau cov dej zoo ntawm chromium plating electrolyte, thiab ntau cov chloride ions yuav tsum tsis txhob muab coj mus rau hauv cov tshuaj plating, tshwj xeeb tshaj yog thaum lub caij qhuav thaum dej hiav txwv yog nchuav rov qab. Ua ntej muab cov plated rau hauv lub tank, dilute sulfuric acid yuav tsum tau siv rau etching, thiab hydrochloric acid yuav tsum tsis txhob siv.
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