Galvanic galvanizing ntawm hlau: tshuab, khoom siv

2024 Tus sau: Howard Calhoun | [email protected]. Kawg hloov kho: 2024-01-02 13:55

Galvanizing yog qhov ua tau zoo thiab pheej yig, thiab yog li ib txoj hauv kev los tiv thaiv ferrous hlau los ntawm corrosion. Feem ntau nws yog siv nyob rau hauv zus tau tej cov hardware thiab fasteners, raws li zoo raws li steel mesh.

Zinc txheej txheej

Anti-corrosion galvanizing yog ua nyob rau hauv ntau txoj kev, thiab lub neej kev pab cuam ntawm txheej nyob ntawm lub thickness ntawm cov txheej tiv thaiv.

Cov txheej txheem ntawm txheej yog nyob ntawm nws cov khoom xav tau, qhov loj ntawm cov khoom, cov xwm txheej rau nws txoj haujlwm ntxiv.

Qhov yooj yim tshaj plaws thiab cov thev naus laus zis tshaj plaws, tab sis tsis txaus muab kev tiv thaiv rau cov neeg kho tshuab kev ntxhov siab ntawm txheej tiv thaiv, yog txias galvanizing siv primers, uas muaj ntau ntawm cov hmoov zinc dispersed heev.

Raws li qhov ntim ntawm galvanizing ntau lawm, kub-dip galvanizing occupies qhov chaw thib ob. Cov txheej uas tau txais los ntawm txoj kev no yog qhov zoo thiab ruaj khov, tab sis ib puag ncig tsis zoo, vim tias siv zinc yaj, thiab cov hluav taws xob ntau yuav tsum tau ua kom nws qhov kub thiab txias tsawg dua 500 ° C, cov txheej txheem tshuaj ntawm kev npaj nto.

Zoo ib yam li kub dip galvanizing ntau duathev naus laus zis, tab sis tsawg dua cov txheej txheem ntawm thermal diffusion deposition ntawm ib txheej tiv thaiv. Nws yog siv thaum xav tau siab muab tso rau ntawm lub thickness thiab cov tsos ntawm txheej.

Lwm txoj kev ntawm galvanizing yog roj-kub txau, uas yog siv los tiv thaiv cov khoom loj thiab cov qauv uas yooj yim tsis tuaj yeem muab tso rau hauv da dej.

Galvanized galvanizing yog tsis muaj ntau qhov tsis zoo ntawm lwm txoj kev txheej txheej thiab nws muaj qhov zoo.

Qhov zoo ntawm zinc plating

Zinc plating los ntawm electrolysis yog txoj kev siv ntau tshaj.

Qhov txiaj ntsig tseem ceeb, vim yog siv galvanic galvanizing ntawm cov hlau, yog qib siab ntawm kev tiv thaiv ntawm cov khoom siv los ntawm corrosion. Ib txheej nyias ntawm zinc ua rau kom lub neej kev pab cuam ntawm cov khoom ntau zaus, thiab yog li txo tus nqi ntawm lawv cov txij nkawm thiab hloov.

Cov txheej yog txawm, tsis muaj streaks thiab tee, thiab cov duab thiab qhov loj ntawm cov khoom yog khaws cia. Koj tuaj yeem siv nws rau cov khoom ntawm ib qho twg, txawm tias qhov nyuaj tshaj plaws.

Cov txheej txheem du thiab ci ntsa iab tsis tas yuav ua ntxiv rau feem ntau.

Ntxiv rau, cov txheej txheem zinc txheej nws tus kheej yuav tsum tau siv nyiaj me ntsis, thiab cov galvanizing units tau ua haujlwm zoo.

Qhov tsis zoo ntawm zinc plating

Txoj kev siv cov txheej txheem tiv thaiv los ntawm electrolysis tsis muaj qhov tsis zoo.

Qhov tsis zoo tseem ceeb yogTsawg adhesion ntawm zinc rau hlau, vim qhov chaw ntawm cov khoom yuav tsum tau ua tib zoo ntxuav.

Qhov kev poob qis kuj yog qhov tsim cov pov tseg tshuaj lom thaum lub sijhawm txheej txheej txheej, yuav tsum tau ntxuav loj.

Tsis ua raws li kev tswj hwm tuaj yeem ua rau hydrogen txhaws ntawm lub hauv paus hlau, uas ua rau cov khoom tsis zoo ntawm nws tus kheej thiab ua txhaum ntawm cov txheej txheem zoo.

Txoj Cai Ua Haujlwm

Galvanizing yog raws li lub hauv paus ntsiab lus ntawm kev tiv thaiv cov nyhuv, uas yog txiav txim los ntawm qhov sib txawv ntawm cov electrochemical muaj peev xwm ntawm zinc thiab hlau. Txij li zinc muaj peev xwm qis dua electrochemical, nws txheej yog kev tiv thaiv kev txi rau cov hlau ferrous. Qhov ntawd yog, nyob rau hauv ib qho chaw ntub dej, nws yog tus uas tau txais electrochemical corrosion.

Thaum hlau yog oxidized, oxides yog tsim uas muaj lub ntim loj dua li qub hlau. Cov oxide zaj duab xis dhau los ua xoob thiab dhau oxygen mus rau cov hlau tseem tsis tau oxidized. Thiab ntawm zinc, thaum lub sij hawm oxidation, zaj duab xis yog nyias thiab ntom, nws tsis cia oxygen tob rau hauv cov hlau, tiv thaiv tsis tau tsuas yog cov txheej, tab sis kuj lub hauv paus hlau hauv qab.

Type of zinc plating

Galvanic galvanizing yog ib lub tshuab uas yog electrolysis, i.e. electrochemical redox txheej txheem nyob rau hauv ib qho electrolyte nyob rau hauv qhov kev txiav txim ntawm ib tug ncaj qha hluav taws xob tam sim no.

Raws li cov khoom siv ntawm cov electrolyte, zinc plating tau muab faib ua peb hom: acid, cyanide thiab alkaline.

Feem ntau siv zinc txheej txheej hauv acidic me ntsiselectrolytes, tshwj xeeb tshaj yog rau cam khwb cia hlau thiab steel qhov chaw ntawm complex configuration. Cov khoom ua los ntawm cov pa roj carbon thiab alloy steels nrog hom galvanizing no tsawg dua qhov tshwm sim ntawm hydrogen embrittlement, thiab cov tsos zoo heev, nrog rau cov hniav zoo nkauj zoo nkauj hauv ntau hom xim.

Kev tiv thaiv galvanizing ntxiv

Cov nyhuv tiv thaiv ntawm zinc txheej yog nyob ntawm nws cov tuab, uas tsuas yog 5 microns thaum electroplated, thiab qhov xwm ntawm electrolyte.

Qee zaum, cov khoom tiv thaiv ntawm zinc txheej yog txhim kho los ntawm passivation, phosphating lossis pleev xim.

Passivation (chromating) - tshuaj kho cov khoom hauv kev daws teeb meem nrog chromic acid los yog nws cov ntsev, raws li qhov tshwm sim ntawm cov chromate films yog tsim rau ntawm qhov chaw. Cov txheej txheem no txhim kho tsis muaj kev tiv thaiv ntau npaum li cov khoom siv kho kom zoo nkauj, vim tias qhov ua kom zoo nkauj ntawm cov txheej txheem, thiab nws tuaj yeem pleev xim rau ntau yam xim.

Thaum phosphating (kev kho hauv phosphoric acid ntsev) ntawm cov khoom siv galvanized, phosphate zaj duab xis yog tsim rau ntawm qhov chaw. Tom qab phosphating, xim tseem tuaj yeem siv tau.

theem ntawm zinc plating

Hauv kev tsim khoom, galvanizing muaj ntau yam txheej txheem thev naus laus zis, txhua qhov ua tiav los ntawm kev ntxuav nrog dej hauv cov dej ntws los yog txoj kev txhuam txhuam.

Ua ntej, cov khoom raug ntxuav kom huv si ntawm xeb, nplai, txheej txheem roj, cov khoom ua kom txiaskua los yog xim thiab degreased nyob rau hauv alkaline daws. Tom qab ntawd electrolytic degreasing tshwm sim.

Tom qab nws, lawv tau muab tso rau hauv cov tshuaj aqueous ntawm hydrochloric acid, nyob rau hauv qhov chaw thaum kawg ntxuav tsis cuam tshuam rau txheej txheej thiab nws yog decapitated - qhib ua ntej siv zinc txheej. Tsuas yog tom qab ntawd yog qhov tseeb galvanizing.

Tom qab nws, yog tias tsim nyog, cov khoom tau qhia meej thiab ntxuav ntawm oxide zaj duab xis nyob rau hauv ib qho aqueous tov ntawm nitric acid, ces phosphated, passivated thiab qhuav.

Thaum galvanizing ntau yam khoom, kev ua haujlwm ntxiv tuaj yeem ua. Piv txwv li, ib lub strip yog unwound ua ntej galvanizing, qhov kawg yog welded, straightened, thiab tom qab nws yog oiled thiab mob.

khoom siv rau zinc plating

Ib txoj kab galvanizing yog ib ntu tshwj xeeb ntawm kev yaug thiab kev siv da dej uas tsim ib qho los yog ntau txheej zinc txheej nrog cov khoom siv uas yuav tsum tau ua.

Raws li cov ntim ntau lawm, cov cuab yeej siv nrog ntau qib ntawm kev siv tshuab. Ntawm cov tuam txhab loj, cov kab tshuab tshuab nrog kev tswj tsis siv neeg raug teeb tsa. Muaj cov kab nrog ib nrab lossis tag nrho phau ntawv tswj, nrog rau cov kab me me.

Cov kab galvanizing muaj ntau tshaj li da dej xwb. Nws suav nrog kev thauj mus los ntawm ntau yam qauv tsim, khoom siv rau kev kho dej khib nyiab,Cov cuab yeej pabcuam, uas suav nrog cov khoom siv rau galvanizing, cov khoom cua sov, cov khoom siv hluav taws xob, cathode thiab anode rods.

Cov cuab yeej siv ntxiv suav nrog cov tshuab cua, tshuab ziab khaub ncaws thiab cov txee, khoom siv tub yees, lim dej, cov khoom siv dej demi-dej, twj.

Electrolytes rau zinc plating

Rau galvanic galvanizing, nyob ntawm lub hom phiaj ntawm cov khoom, cov khoom siv electrolytes, uas tau muab faib ua ob pawg loj.

Electrolytes, nyob rau hauv uas zinc yog nyob rau hauv daim ntawv ntawm yooj yim hydrated ions, hu ua yooj yim acidic. Cov no yog hydroboric, sulfate thiab chloride daws.

complex acidic thiab alkaline electrolytes muaj zinc hauv complex ions nrog rau tus nqi zoo thiab tsis zoo. Cov no yog ammonia, pyrophosphate, cyanide thiab lwm yam tshuaj.

hom electrolyte siv feem ntau txiav txim siab tus nqi ntawm deposition thiab ces qhov zoo ntawm zinc deposits ntawm cov khoom (cathode).

Los ntawm cov electrolytes complex, zinc nyob ntawm cathode nrog siab ion tawg. Raws li qhov ceev tam sim no nce, cov txiaj ntsig ntawm cov hlau txo qis thiab cov txiaj ntsig ntawm hydrogen nce.

Yog li ntawd, zinc plating hauv cov electrolytes complex yog nqa tawm ntawm qhov tsis tshua muaj tam sim no, thiab txheej txheej yog qhov zoo heev, nplua-grained thiab uniform.

Nyob rau hauv me ntsis acidic yooj yim electrolytes, galvanizing, nrog rau hauv tsev, yuav siv sij hawm qhov chaw nyob rau hauv lub siab tam sim no ceev, nrog ib tug siab ceev tshaj thaum siv complex kev daws teeb meem. Cov tsos ntawm cov khoom yog zoo, tab sisCov txheej tsis yog qhov zoo heev thiab tsuas yog tsim rau cov khoom ntawm cov duab yooj yim xwb.

Galvanized zinc plating

Technological txheej txheem ntawm ncaj qha galvanizing tshwm sim nyob rau hauv ib da dej nrog electrolyte. Cov khoom uas ua los ntawm cov hlau ferrous yog qis rau hauv nws, uas muaj hluav taws xob tam sim no (cathode) tau muab los ntawm cov electrodes tshwj xeeb, thiab cov zinc ntshiab hauv daim ntawv ntawm cov pob lossis cov phaj nteg rau hauv cov ntu tshwj xeeb mesh (anode).

Thaum muaj cov tshuaj tiv thaiv hluav taws xob, nyob rau hauv kev cuam tshuam ntawm cov hluav taws xob tam sim no nrog qhov ceev ntawm 1 txog 5 A / dm, zinc yaj hauv cov electrolyte, ces nws cov ions nyob rau ntawm cathode, tsim 4-25 micron tuab galvanic. txheej.

Nws yog nrog kev siv cov thev naus laus zis no uas fasteners (bolts thiab txiv ntseej) tau txais nrog cov txheej txheem thiab ci ntsa iab.

Automated Galvanizing Kab

Cov kab galvanizing niaj hnub no yog ib txoj kab uas siv tag nrho, uas ua tiav txhua theem ntawm txheej, suav nrog vuam thiab zoo degreasing ntawm cov khoom rau ntau lub hom phiaj thiab kev teeb tsa.

Cov kab tsis siv neeg feem ntau muaj cov txheej txheem thev naus laus zis electroplating da dej, modular rectifiers, lub chaw thau khoom / tshem tawm, cov khoom siv thauj khoom, cov khoom siv rau kev tso pa tawm, dej xau thiab dej phwj pov tseg, cov ncej hlau nrog cov ntaiv kev pabcuam.

Electroplating da dej tuaj yeem ua los ntawm cov hlau tsis muaj steel, yas hlua hlau lossis roj hmab. Cov chav da dej niaj hnub no, welded los ntawm cov ntawv polymers, tab tom hloov cov thawv hlau. Kev xaiv ntawm cov khoom siv da dej yog nyob ntawm qhov muaj pes tsawg leeg thiab cov ntsiab lus ntawm cov electrolyte thiab kev ua haujlwm kub.

Kev sib txuas lus ntawm cov dej xa dej thiab cov kav dej phwj tuaj, thiab feem ntau qhov cua nyob hauv qab da dej thiab tseem ua los ntawm polypropylene.

Qhov ntev ntawm kab yog txiav txim siab los ntawm nws cov khoom tsim tau thiab qhov ntev ntawm cov da dej electroplating.

Galvanic galvanizing tshwm sim nrog kev tsim cov dej khib nyiab nrog qhov siab ntawm cov hlau hnyav ions. Yog li ntawd, lawv raug tiv thaiv, lim, nruab nrab, tshuaj nag lossis daus, sorption thiab lwm yam txheej txheem yog siv rau hauv cov thawv ua los ntawm engineering polymers.

Electrolytic zinc plating tom tsev

Galvanic galvanizing, tsim los ntawm ib tus kheej tes, pib nrog kev xaiv cov khoom siv. Cov electrolyte tuaj yeem yog cov tshuaj zinc chloride thiab hydrochloric acid hauv cov dej distilled. Qhov no yog qhov hu ua soldering acid, uas feem ntau siv hauv tsev. Craftsmen pickle zinc nyob rau hauv roj teeb sulfuric acid thiab tau electrolyte ZnSO _{4, tab sis cov txheej txheem no yog txaus ntshai, vim hais tias tawg hydrogen thiab tshav kub tawm thaum lub sij hawm cov tshuaj tiv thaiv. Tsis muaj teeb meem yuav tsum muaj precipitate ntawm undissolved ntsev crystals nyob rau hauv lub electrolyte.}

Ntshiab zinc tuaj yeem yuav ntawm lub khw muag tshuaj lossis xov tooj cua, lossis tuaj yeem tau los ntawm cov roj teeb ntsev lossis fuses los ntawm Soviet Union.

Galvanicda dej tuaj yeem yog iav lossis yas ntim. Stands rau anode thiab cathode yog ntsia rau hauv nws. Lub anode yog zinc phaj uas "ntxiv" txuas los ntawm lub zog hluav taws xob. Qhov loj dua qhov anode, ntau qhov sib txawv ntawm cov txheej txheem yuav nyob ntawm cathode, cov khoom siv tiv thaiv txheej yuav raug siv. Nws tuaj yeem muaj ob peb anodes, lawv tuaj yeem muab tso rau ib ncig ntawm lub cathode ntawm tib qhov kev ncua deb kom nws qhov chaw yog them nrog zinc sib npaug thiab ib txhij los ntawm txhua sab. Qhov "tshem tawm" ntawm lub zog hluav taws xob txuas nrog lub cathode.

Txawm tias thaum galvanizing ua tiav hauv tsev, thev naus laus zis yuav tsum suav nrog kev tu kom huv thiab degreasing ntawm ntu, nrog rau nws ua kom muaj kua qaub.

Lub zog hluav taws xob yog lub tsheb roj teeb uas muaj lub teeb hluav taws xob tsawg lossis lwm tus neeg siv khoom hauv Circuit Court kom cov tam sim no hauv Circuit Court qis dua, lossis lub zog hluav taws xob nrog qhov hluav taws xob tas li. Qhov tseem ceeb tshaj plaws yog tias yuav tsum tsis muaj qhov kub ceev ntawm cov electrolyte thaum lub sij hawm galvanizing.

Qhov tseeb, galvanizing tshwm sim thaum cov anodes thiab cathode tau qis rau hauv electrolyte thiab hluav taws xob Circuit Court kaw. Cov txheej txheem siv sij hawm ntev dua, cov txheej zinc thicker nyob ntawm cov khoom.

Nrog kev pab los ntawm galvanizing, cov txheej txheem tiv thaiv ntawm cov khoom ua tiav, zoo ib yam thiab du, nrog cov nyhuv zoo nkauj. Nws yog siv ob qho tib si hauv kev lag luam thiab hauv tsev, txawm tias qhov tseeb tias kev kho dej khib nyiab los ntawm ib puag ncig kev puas tsuaj yuav tsum tau ua.