Dab tsi yog qhov cuam tshuam ntawm trivalent chromium ntawm chromium plating txheej txheem ntawm hluav taws xob cua sov raj?

Dab tsi yog qhov cuam tshuam ntawm trivalent chromium ntawm chromium plating txheej txheem ntawm hluav taws xob cua sov raj?

74. Dab tsi yog qhov cuam tshuam ntawm trivalent chromium ntawm cov txheej txheem chromium plating?

Teb: Thaum lub sij hawm chromium plating txheej txheem, vim qhov txo ntawm chromic anhydride ntawm lub cathode, nws yog inevitable rau chromium plating electrolyte los tsim trivalent chromium thaum lub sij hawm chromium plating. Cov kev npaj tshiab chromium plating tov maj mam nce hauv trivalent chromium concentration los ntawm xoom thaum pib ntawm electrolysis, thiab thaum kawg ncav cuag qhov sib npaug vim trivalent chromium oxidation ntawm lub anode. Trivalent chromium yog qhov tseem ceeb hauv kev tsim cov yeeb yaj kiab colloidal, tab sis nws kuj yuav tsum muaj cov ntsiab lus tsim nyog kom tau txais cov txheej txheem chromium zoo. Yog hais tias trivalent chromium cov ntsiab lus siab dhau lawm, cov zaj duab xis tsim colloidal yog tuab heev, thiab qhov ntau ntawm tau txais cov txheej glossy yog txo. Cov txheej tau txais yog grey thiab ntxhib, zoo ib yam li cov txheej tau txais thaum cov ntsiab lus sulfuric acid tsawg lossis qhov kub thiab txias. Thaum cov ntsiab lus chromium trivalent tsawg dhau lawm, cov yeeb yaj kiab tsim tawm colloidal tsis tu ncua, ua rau cov txheej txheem tsis sib xws, thiab hauv qee qhov chaw muaj txawm tias tsis muaj txheej, zoo ib yam li qhov tshwm sim ntawm cov ntsiab lus sulfuric acid siab. Nyob rau hauv ib txwm ua hauj lwm chromium plating electrolyte, qhov concentration ntawm trivalent chromium ranges ntawm 1 mus rau 3 grams ib liter (xws li Cr2O3). Qhov concentration ntawm trivalent chromium yog txiav txim los ntawm qhov sib piv ntawm anode tam sim no ceev rau cathode tam sim no ceev. Nws yog qhov zoo tshaj los ua qhov piv txwv no sib npaug rau 0.5, uas txhais tau hais tias thaj tsam anode yog ob zaug loj dua li thaj tsam cathode.

75. Yuav ua li cas cov ntsiab lus trivalent chromium nyob rau hauv cov tshuaj chromium plating yog tias nws siab dhau lawm?

Teb: Txhawm rau txo cov ntsiab lus ntawm trivalent chromium hauv cov tshuaj chromium plating, electrolysis yuav tsum tau nqa tawm nrog kev siv siab tam sim no ntawm lub me me cathode nto thiab qhov loj tshaj plaws anode nto. Txoj kev tshwj xeeb rau trivalent chromium oxidation rau hexavalent chromium ntawm lub anode yog kom sov cov tshuaj mus rau 80 degree, siv ib tug nyias hlau pas nrig raws li cathode, thiab anode cheeb tsam yog kaum mus rau kaum zaus ntawm cathode cheeb tsam. Lub anode tam sim no ceev yog 1.8-2A/d ㎡. Lub sij hawm electrolysis nyob ntawm cov ntsiab lus ntawm trivalent chromium, thiab qhov kub thiab txias, qhov zoo dua qhov kev tshem tawm trivalent chromium.

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