Qhov sib txawv tseem ceeb ntawm cov kua qaub zinc thiab alkaline zinc plating yog cov txheej txheem zinc zinc plating muaj qhov nrawm dua electrodeposition npaum li cas thaum cov alkaline zinc plating muaj qhov qis electrodeposition.
txheej txheem plating yog kev tiv thaiv kev xeb. Peb siv cov txheej txheem zinc plating feem ntau los tiv thaiv cov hlau nto lossis hlau thiab hlau tiv thaiv corrosion los ntawm xeb. Yog li ntawd, peb thov ib txheej nyias ntawm zinc rau ntawm cov hlau nto (substrate) uas tsim ib qho kev thaiv lub cev. Muaj ob hom loj ntawm zinc plating uas peb siv ntau zaus; acid zinc thiab alkaline zinc plating. Lub alkaline zinc plating yog dua nyob rau hauv ob hom li alkaline cyanide plating thiab alkaline non-cyanide plating.
Acid Zinc Plating yog dab tsi?
Acid zinc plating yog txheej txheem ntawm electroplating uas peb siv cov kua qaub xws li zinc sulfate lossis zinc chloride complexes. Piv rau alkaline zinc plating, qhov no yog ib qho kev sib piv tshiab. Nyob ib ncig ntawm 50% ntawm zinc plating txheej txheem uas peb siv niaj hnub no yog cov txheej txheem zinc plating. Cov ntaub ntawv hlau uas peb tuaj yeem electroplating siv cov txheej txheem no suav nrog cam khwb cia hlau, malleable hlau thiab carbonitrided hlau.
Daim duab 01: Zinc Plated Chev
Cov tshuaj tiv thaiv kev cuam tshuam hauv cov txheej txheem no yog raws li hauv qab no:
ZnCl2 + 2 KCl → K2ZnCl4
K2ZnCl4 → 2K+ + ZnCl4
ZnCl2 →Zn2+ + 2Cl–
Muaj ob qhov zoo rau kev siv cov txheej txheem no. Ua ntej, nws muaj kev ua haujlwm siab cathode uas ua rau muaj kev cuam tshuam tsawg dua. Thiab tseem, nws ua rau cov nqi electroplating sai dua. Qhov thib ob, nws yuav tsum tau kho cov khib nyiab tsawg heev. Txawm li cas los xij, muaj qhov zoo ntawm cov txheej txheem no thiab; Cov txheej txheem corrosive ntawm cov tshuaj siv, ua rau muaj kev daws teeb meem hauv qhov chaw so, uas tuaj yeem cuam tshuam rau cov txheej txheem yog tias tsis ua raws li cov txheej txheem yaug kom raug.
Alkaline Zinc Plating yog dab tsi?
Alkaline zinc plating yog txheej txheem ntawm electroplating uas peb siv cov tshuaj alkaline. Muaj ob txoj kev sib txawv ntawm txoj kev plating no; alkaline cyanide plating thiab alkaline non-cyanide plating txheej txheem.
Alkaline Cyanide Plating
Qhov no yog thawj txheej txheem muaj. Cov tshuaj tiv thaiv uas koom nrog hauv cov txheej txheem no yog raws li hauv qab no:
[Zn(CN)4 2- + 2OH– → [Zn (OH)2] + 4CN–
[Zn(OH)2] + e → [Zn(OH)2–
[Zn(OH)2]- → Zn(OH) + OH–
ZnOH + e → Zn + OH–
Txawm li cas los xij, tam sim no cov txheej txheem plating no tsis siv vim kev ua haujlwm siab ntawm lwm cov txheej txheem thiab cov kev cai nruj ib puag ncig. Txawm li cas los xij, nws muaj qhov txiaj ntsig tseem ceeb. Qhov ntawd yog; nws muaj peev xwm ntawm zinc plating nyob rau hauv qhov chaw uas tsis tshua muaj tam sim no qhov chaw xws li cov hlab.
Daim duab 02: Zinc Plating Solution nyob rau hauv Test Cell
Alkaline Tsis-cyanide Plating
txheej txheem no muaj cov ntawv thov hauv kev lag luam niaj hnub vim nws txoj kev ntseeg siab, tus nqi siv nyiaj, thiab lwm yam. Cov tshuaj tiv thaiv uas tshwm sim thaum lub sijhawm txheej txheem no yog raws li hauv qab no:
[Zn(OH)4 2- → [Zn(OH)3 – + OH–
[Zn(OH)3 – + e → [Zn(OH)2] + OH–
[Zn(OH)2] → Zn(OH) + OH–
ZnOH + e → Zn + OH–
Txawm li cas los xij, muaj ob peb qhov tsis zoo hauv cov txheej txheem no. Ua ntej, cov kev daws teeb meem peb siv hauv cov txheej txheem no muaj cov ntsiab lus siab ntawm carbonates. Kev tsim cov carbonate nce nrog kev ntxhov siab thiab nce kev daws qhov kub thiab txias. Nws ua rau txo cov tshuaj conductivity. Yog li, nws cuam tshuam cov txheej txheem electroplating. Piv nrog rau cov txheej txheem no, acid zinc plating muaj cov conductivity vim KCl hauv kev daws.
Qhov txawv ntawm Acid Zinc thiab Alkaline Zinc Plating yog dab tsi?
Acid zinc plating yog txheej txheem ntawm electroplating uas peb siv cov kua qaub thaum alkaline zinc plating yog cov txheej txheem ntawm electroplating uas peb siv cov tshuaj alkaline. Muaj ntau qhov sib txawv ntawm acid zinc thiab alkaline zinc plating. Qhov tseem ceeb tshaj plaws, qhov sib txawv tseem ceeb ntawm cov kua qaub zinc thiab alkaline zinc plating yog cov txheej txheem acid zinc plating muaj qhov nrawm dua electrodeposition npaum li cas thaum alkaline zinc plating muaj qhov qis electrodeposition. Lwm qhov sib txawv tseem ceeb ntawm cov kua qaub zinc thiab alkaline zinc plating yog cov txheej txheem zinc zinc plating yuav tsum tau kho cov khib nyiab tsawg kawg nkaus thaum cov txheej txheem alkaline zinc plating yuav tsum muaj kev kho mob siab heev.
Cov hauv qab no qhia ntau ntxiv txog qhov sib txawv ntawm cov kua qaub zinc thiab alkaline zinc plating.
Summary – Acid Zinc vs Alkaline Zinc Plating
Zinc electroplating yog cov txheej txheem ntau tshaj plaws uas peb siv los tiv thaiv cov hlau ntawm xeb. Muaj peb hom zinc plating; acid zinc plating, alkaline cyanide plating, thiab alkaline non-cyanide plating. Qhov sib txawv tseem ceeb ntawm cov kua qaub zinc thiab alkaline zinc plating yog cov kua qaub zinc plating txheej txheem muaj cov electrodeposition sai dua li alkaline zinc plating.
