Abstract:
Dub chromium platingtau muag khoom rau ntau tshaj 50 xyoo.Tus thawj dub chromium plating yog piav nyob rau hauv Mil Std 14538 uas deposits dub chromium los ntawm ib tughexavalent chromiumelectrolyte.Tshaj li kaum xyoo dhau los, muaj kev lag luam kev loj hlob ntawm cov xim dub chromium deposits los ntawm atrivalent chromiumelectrolyte.Daim ntawv no yuav tshuaj xyuas cov yam ntxwv ntawm kev tso nyiaj thiab kev txiav txim siab ua haujlwm ntawm qhov zoo sib xws, tab sissib txawv chromium platingtso nyiaj.
Taw qhia
Kev zoo nkauj thiab tsiaj nyaum (Fabkis: La Belle et la Bête) yog ib zaj dab neeg uas sau los ntawm Fabkis tus kws sau ntawv tshiab Gabrielle-Suzanne Barbot de Villeneuve thiab luam tawm xyoo 1740. Peb qhov kev sib piv nrog qhov kev nthuav qhia no yuav tsis yog nyob rau hauv zaj dab neeg tab sis qhov sib txawv ntawm covtsib tw thiabhexavalentchromium-raws li dub chromium plating txheej txheem.
Daim duab 1 piv cov tsos ntawm trivalent thiab hexavalent txheej txheem daws.Sab laug yog cov txheej txheem chromium sulfate-based trivalent dub chromium plating txheej txheem.Cov xim tov yog xiav sib sib zog nqus, lub tank yog huv si, thiab cov tshuaj yog ruaj khov.Peb yooj yim txiav txim siab tias cov txheej txheem no yuav raug hu ua Kev Zoo Nkauj hauv qhov kev nthuav qhia no.
Ntawm sab xis yog cov txheej txheem chromium trioxide-raws li dub chromium plating txheej txheem.Cov xim xim yog reddish xim av.Thaum lub sij hawm electroplating, hydrogen roj hloov zuj zus tuaj, uas tuaj yeem tsim ib hexavalent chromium-muaj pos huab.Cov huab cua no yuav tsum tau tswj nrog cov dej ntub dej thiab los yog thawb-rub qhov cua.Lub hexavalent dub chromium, yam tsawg kawg rau tus so ntawm qhov kev nthuav qhia no, yuav raug xa mus rau qhov zoo tshaj plaws.
Daim duab 1 - Kev sib piv ntawm trivalent thiab hexavalent dub chromium plating txheej txheem.
Lub hom phiaj ntawm txoj haujlwm no yog txhawm rau txheeb xyuas lwm cov xim dub chromium electroplating deposits thiab txiav txim siab siv cov tswv yim thiab tsim nyog ntawm cov txheej txheem no nyob rau sab hauv thiab sab nrauv tsheb thiab kev lag luam.Lub hom phiaj yog nyob rau hauv cov yam ntxwv ntawm lub cev kev ua tau zoo, nrog rau kev tiv thaiv corrosion, khawb kuj, stain kuj thiab zoo li ntawm ob qho tib si hexavalent thiab trivalent-raws li dub chromium deposits.Cov txiaj ntsig yuav tsum ua raws li cov lus qhia siv tau rau kev xaiv qhov zoo tshaj plaws kev sib txuas ntawm plated coatings kom ua tiav qhov kev xav tau.Peb kuj nrhiav kev txheeb xyuas seb cov xim dub chromium deposits piv nrog lwm cov txheej txheem dub, xws li PVD, dub hmoov tsho tiv no thiab dub electroless npib tsib xee.
Keeb kwm
Cov patents rau dub chromium plating hnub rov qab mus rau 1952. Thawj patent muaj feem xyuam rau electroplating dub chromium, tau muab rau Gilbert thiab Buhman.1 Gilbert thiab Buhman tsim ib tug txheej txheem siv aqueous chromic anhydride thiab acetic acid kom ua tau ib tug maub grey rau dub deposit rau. Cov phom phom, cov khoom siv phom loj thiab cov khoom siv tub rog ntawm Rock Island Arsenal.1 Cov patents ntxiv tau thov los ntawm Westinghouse Electric hauv 1956 thiab Kewanee Oil Company (Harshaw Chemical), tau tshaj tawm xyoo 1971.2,3 Lub Harshaw Chemical patent, nws thiaj li raug xa mus los ntawm M&T Chemicals, thiab tam sim no raug muag raws li Atotech Chemical tradename Econo-chrome BK.
Thawj patents rautrivalent chromium platinghnub rov qab mus rau thaum ntxov 1970. Gyllenspentz thiab Renton ntawm Albright thiab Wilson;ib yam li Tremmel ntawm OMI (tam sim no MacDermid Enthone), yog ib qho ntawm cov pioneers thaum ntxov los ua txoj kev loj hlob ntawm trivalent chromium electroplating da dej.Tremmel txoj haujlwm tau tsom mus rau kev siv thiazole tebchaw, whereas Gyllenspentz thiab Renton txoj haujlwm tsom mus rau kev siv formate, acetate, bromide thiab ammonium kom ua tiav cov khoom lag luam zoo. feem ntau siv tam sim no uas yooj yim rau kev tswj.
Kev sib piv ua haujlwm
Table 1 piv cov kev khiav hauj lwm tsis ntawm ob qho tib si chloride thiab sulfate versions ntawm trivalent dub chromium thiab cov hexavalent dub chromium txheej txheem.3 Thawj thiab tseem ceeb tshaj plaws ua hauj lwm sib txawv yog nyob rau hauv cov electrolyte.Cov txheej txheem trivalent dub chromium siv chloride los yog sulfate hlau ntsev nrog chromium rau electrolyte, thaum lub hexavalent dub chromium siv chromium trioxide (los yog chromic acid) rau lub ntsiab tivthaiv.Cov chav da dej trivalent ua haujlwm ntawm pH ntau ntawm 2-4 thaum lub hexavalent dub chromium ua haujlwm ntawm pH tsawg dua 1. Cov kev khiav hauj lwm kub zoo sib xws hauv peb qhov kev daws teeb meem.
Nyem qhov no mus kawm:Qhov sib txawv ntawm Trivalent Chromium thiab Hexavalent Chromium
Table 1 - Kev sib piv ntawm cov tshuaj chloride Cr(III), sulfate Cr(III) thiab Cr(VI)
Cov txheej txheem.
Raws li kev pov tseg thiab kev pov hwm, cov txheej txheem trivalent dub chromium muaj lub zog pov tseg zoo thiab yuav npog qhov chaw ntau dua yam tsis muaj kev siv tshwj xeeb anodes.Standard racking designs yuav siv tau.
Txawm li cas los xij, qhov no tsis yog qhov teeb meem nrog cov txheej txheem hexavalent dub chromium.Kev ua haujlwm tsis zoo ua rau tsis muaj pov tseg thiab npog lub zog.Tsis muaj qhov tshwj xeeb rack fixturing (piv txwv li, auxiliary anodes), cov xim dub chromium tso nyiaj yuav muaj ntau qhov ntxoov grey thiab grey / dub, thiab ntau cov khoom siv tshuaj yuav tsum tau sib npaug rau qhov zoo tshaj plaws dub nyob rau hauv tag nrho cov tam sim no ntom ntau.
About CheeYuen
Tsim los ntawm Hong Kong xyoo 1969,CheeYuenyog ib lub chaw muab kev daws teeb meem rau kev tsim khoom yas thiab kho qhov chaw.Nruab nrog cov tshuab siab heev thiab cov kab ntau lawm (1 lub cuab yeej thiab kev txhaj tshuaj molding center, 2 electroplating kab, 2 painting kab, 2 PVD kab thiab lwm yam) thiab coj los ntawm ib tug cog lus pab neeg ntawm cov kws txawj thiab cov kws kho mob, CheeYuen Surface Treatment muab ib tug turnkey tov rauchromed, pleev xim&PVD qhov chaw, los ntawm cov cuab yeej tsim rau kev tsim khoom (DFM) mus rau PPAP thiab nws thiaj li ua tiav cov khoom xa tuaj thoob plaws ntiaj teb.
Certified los ntawmTIAB SA 16949, ISO9001thiabISO 14001thiab audited nrogVDA 6.3thiabCSR, CheeYuen Surface Treatment tau dhau los ua tus neeg xa khoom dav dav thiab cov tswv yim sib koom tes ntawm ntau lub npe nrov thiab cov chaw tsim khoom hauv tsheb, khoom siv, thiab da dej industries, suav nrog Continental, ALPS, ITW, Whirlpool, De'Longhi thiab Grohe, lwm.
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Post lub sij hawm: Feb-26-2024