Electroplating hlau galvanizing: technology, cov khoom

Galvanizing - zoo thiab pheej yig, thiab yog li ntawd ib qho txoj kev tiv thaiv ferrous co ntawm corrosion. Nyob rau hauv feem ntau, nws yog siv nyob rau hauv qhov siv thiab ua hardware thiab fasteners, thiab ib tug steel mesh.

Txoj kev uas tso npe thov cov zinc coating

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

Ib tug qauv ntawm cov txheej nyob rau ntawm cov kev kawm zog, cov khoom loj, tej yam kev mob rau nws ntxiv siv.

Cov feem ntau yooj yim thiab manufacturable, tab sis muab tsis txaus kuj mus txhua yam kev nyuaj siab ntawm tus tiv thaiv txheej, - ib tug txias galvanizing ntawm av, uas muaj ib tug loj tus naj npawb ntawm finely faib zinc hmoov.

Los ntawm volume galvanizing ntau lawm Qib thib ob kub-dip galvanizing. Cov txheej tau nyob rau hauv no yav tas, high quality thiab check, tab sis environmentally tsis zoo, txij li thaum zinc qhuav yog siv, tab sis tseem kom muaj nws kub me ntsis tsawg tshaj li 500 ° C yuav tsum tau ib tug loj npaum li cas ntawm hluav taws xob lub hwj chim, tshuaj txoj kev nto npaj.

Heev uas zoo sib xws rau cov kub-dip galvanizing ntau hauj, tab sis tsawg npaum txoj kev uas tso npe thov ib tug tiv thaiv txheej ntawm lub thermal diffusion. Nws yog siv thaum teem siab xav tau nyob rau hauv lub thickness thiab cov txheej txheej siab.

Lwm txoj kev galvanizing - ib tug roj-thermal Txau, uas yog siv rau kev tiv thaiv ntawm loj cov khoom thiab lug uas yog tsuas yog tsis yooj yim sua kom muab tso rau ib tug da dej.

Galvanizing lacks ntau ntawm cov disadvantages ntawm lwm yam txheej txoj kev thiab nws muaj nws zoo sab.

Qhov zoo ntawm cov galvanizing

Ib tug qauv ntawm cov ntawv thov cov zinc coating los ntawm electrolysis yog feem ntau.

Lub ntsiab kom zoo dua, vim hais tias ntawm cov uas nws yog galvanically thov hlau galvanizing, yog lub high degree ntawm kev tiv thaiv tiv thaiv xeb qhov chaw ntawm cov khoom. Ib tug nyias txheej ntawm zinc tsub kom cov kev pab cuam lub neej ntawm cov khoom ib tug ob peb lub sij hawm, thiab yog li ntawd txog cov nqi ntawm txij nkawm thiab hloov.

Cov txheej yog tau txawm tsis muaj streaks thiab mob khaws cia rau hauv tus duab thiab luaj li cas ntawm cov khoom. Thov nws yog ua tau rau tej khoom ntawm tej, txawm lub feem ntau complex nrhiav.

Du thiab ci iab zoo nkauj coatings tsis yuav tsum tau nyob rau hauv feem ntau tus neeg mob ntxiv kev kho mob.

Dhau li ntawd, lub galvanizing txheej txheem yuav tsum tau tsuas me kev siv nyiaj, thiab galvanic aggregates muaj ib tug siab productivity.

tsis zoo galvanizing

Ib tug qauv rau kev thov ib tug tiv thaiv txheej ntawm electrolysis tsis yog tsis muaj drawbacks.

Lub ntsiab drawback - tsis muaj zinc adhesion rau hlau, vim uas tus nplaim cov khoom yuav tsum tau kom huv si ntxuav.

Lub downside kuj yog tsim nyob rau hauv lub txheej txheej txheem lom pov tseg yuav tsum loj tu.

Tsis ua hauj lwm hom yuav ua rau sau ntawm niam txiv hlau nrog hydrogen, uas tau nyob rau hauv fragility ntawm cov khoom thiab cov kev cuam tshuam ntawm cov txheej zoo.

hauv paus ntsiab lus ntawm cov lag luam

Galvanizing yog raws li nyob rau hauv lub hauv paus ntsiab lus ntawm cov kev tiv thaiv nyhuv, uas yog txiav txim los ntawm qhov sib txawv nyob rau hauv electrochemical potentials ntawm zinc thiab hlau. Raws li zinc muaj ib tug tsawg dua electrochemical tej zaum, nws yog coated nrog sacrificial pab tiv thaiv kom ferrous hlau. Uas yog raws nraim nws yog raug nyob rau hauv ib tug ntub dej ib puag ncig ntawm electrochemical corrosion.

Nyob rau hauv lub oxidation ntawm cov hlau oxides yog tsim muaj ib tug ntau dua volume tshaj tus thawj hlau. Lub oxide zaj duab xis yuav xoob thiab dhau mus rau tsis tau oxidized hlau oxygen. Thiab zinc nyob rau hauv lub oxidation zaj duab xis yog tsim nyias thiab compact, nws tsis kis tau mus rau hauv lub hlau oxygen tiv thaiv tsis tau tsuas yog cov txheej tab sis kuj yog lub hauv paus hlau hauv qab.

Hom galvanizing

Galvanizing plating - technology, sawv cev rau electrolysis, piv txwv li electrochemical redox dab nyob rau hauv lub ntsha nyob rau hauv tus ntawm ib tug tsis tu ncua hluav taws xob tam sim no ...

Nyob rau hauv muaj pes tsawg leeg ntawm lub ntsha zinc plating yog muab faib ua peb yam: acid, alkali thiab cyanide.

Cov feem ntau siv txoj kev ua ntawv thov cov zinc coating rau weakly acidic electrolytes, tshwj xeeb yog hlau thiab steel qhov chaw ntawm complex configuration. Cov khoom ua los ntawm cov pa roj carbon thiab hlau steels nrog ib tug zinc coating raug kom tsawg tshwm sim ntawm hydrogen embrittlement, thiab yav tom ntej zoo li yog tau, nrog zoo heev hniav hauv cov nyhuv hauv ib tug ntau ntawm cov xim.

Ntxiv kev tiv thaiv rau galvanizing

Cov kev tiv thaiv kev txiav txim ntawm zinc coating nyob ntawm nws thickness, uas nyob rau hauv lub galvanic deposition ntawm 5 microns, thiab qhov xwm ntawm tus ntsha.

Nyob rau hauv tej rooj plaub, tus tiv thaiv thaj chaw ntawm lub zinc coating tsub kom passivation, phosphating los yog painting.

Passivation (chromating) - tshuaj kev kho mob ntawm cov khoom nyob rau hauv kev daws teeb meem ntawm chromic acid los yog ntsev ntawd, raws li ib tug tshwm sim ntawm uas tus nto tsim chromate zaj duab xis. Qhov no txoj kev tsis tau tsuas yog tsub kom tus tiv thaiv thaj chaw ntawm ntau breeds, vim hais tias raws li ib tug tshwm sim ntawm enhanced gloss txheej, thiab nws muaj peev xwm yuav pleev xim rau nyob rau hauv ntau yam xim.

Thaum phosphating (kev kho mob nrog phosphoric acid nyob rau hauv ntsev) galvanized cov khoom nyob rau hauv lub phosphate zaj duab xis tsim nto. Tom qab phosphating tej zaum tseem thov xim.

Cov qib galvanizing

Qhuav electroplating galvanizing muaj ob peb dab, txhua tus uas yog haujlwm los ntawm ntxuav nyob rau hauv khiav dej tub los yog lub tshuab ntxhua khaub txhuam thiab txoj kev.

Thawj cov khoom yog ua tib zoo ntxuav ntawm xeb, teev, hauj lubricant, coolant los yog xim residues thiab degreased nyob rau hauv alkali daws teeb meem. Ces tus electrolytic degreasing.

Tom qab ntawd etched nyob rau hauv ib tug aqueous tov ntawm hydrochloric acid nyob rau hauv uas qhov kawg nto ntxuav tsis tabkaum nto txheej thiab pickling nws tshwm sim - kom ua ntej daim ntawv thov ntawm cov zinc coating. Tsuas yog ces ua lawv tus kheej galvanizing.

Tom qab hais tias, yog tias tsim nyog, clarified thiab lim cov khoom ntawm oxide zaj duab xis nyob rau hauv ib tug aqueous nitric acid tshuaj, thiab ces phosphating, passivation thiab kom qhuav.

Ntxiv hauj lwm yuav tsum tau ua nrog galvanizing ntau yam khoom. Piv txwv li, lub sawb yog unwound ua ntej galvanizing, welded xaus, feem ntau yog tom qab ib oiled thiab mob.

Khoom rau galvanizing

Hluav taws xob cov kab - ib lub theem ntawm cov txheej txheem da thiab muab yaug nyob rau hauv uas yog mono- los yog multilayer zinc coating nrog cov yam haumxeeb zog.

Nyob rau hauv raws li cov ntau lawm ntim khoom siv nrog cov zaubmov ntawm mechanization. Loj qhauj yog tsim mechanized kab nrog automatic tswj. Muaj kab nrog ib tug ib nrab los yog tag nrho phau ntawv tswj raws li zoo raws li ib tug mini-line.

Galvanizing kab muaj tsis tsuas yog ntawm tus da. Nws muaj xws li thauj systems ntawm ntau yam designs, tus tsim nyog cov khoom rau wastewater kho mob, koom haum pab khoom, uas muaj xws li txhais tau tias rau galvanizing, cua kub hais, Thaum tshav kub kub exchangers, lub cathode thiab anode pas nrig.

Lub accessory muaj xws li cua tshuab, kom qhuav xwm thiab tub yees khoom, lim cov khoom, uas tau txais cov khoom demivody twj.

Electrolytes rau galvanizing

Rau galvanizing, nyob ntawm seb lub hom phiaj ntawm cov khoom yog siv electrolytes, uas yog muab faib ua ob lub ntsiab pawg.

Electrolytes nyob rau hauv uas zinc yog nyob rau hauv daim ntawv ntawm tej yam yooj yim hydrated ions, hu ua ib tug yooj yim acid. Qhov no fluoboric, sulfate thiab chloride daws teeb meem.

Complex kev acidic thiab alkaline electrolytes muaj zinc ions nyob rau hauv ib tug complex nrog ib tug zoo thiab tsis zoo xwb. Qhov no ammine, pyrophosphate, cyanide thiab lwm yam kev daws teeb meem.

Nyob rau uas cov ntsha yog thov, nws nyob feem nyob rau hauv deposition tus nqi, thiab ces qhov zoo tshaj ntawm deposits ntawm zinc rau hauv tsab xov xwm (cov cathode).

Los ntawm txoj electrolytes zinc tso rau ntawm lub cathode nyob rau high school dispersion ntawm ions. Nrog ua tam sim no ceev hlau txo tawm los thiab tsub kom lub tawm los ntawm hydrogen.

Yog li ntawd galvanizing nyob rau hauv txoj electrolytes ua nyob rau ntawm tsawg tam sim no ceev, thiab txheej yog ib tug heev zoo, zoo grained thiab homogeneous.

Nyob rau hauv weakly acidic electrolytes yooj yim galvanic zinc, nyob rau hauv tsev xws li, kis nyob rau high school tam sim no ceev, nrog ntau dua tshaj li thaum siv lawv txoj kev daws teeb meem npaum li cas. Zoo li cov khoom tau yog zoo, tab sis lub txheej yog tsis heev zoo siab thiab yog haum nkaus xwb rau kuj yooj yim cov khoom daim.

galvanizing

Technological txheej txheem tshwm sim ncaj qha nyob rau hauv lub galvanizing da dej ntawm ntsha. Nws rho los ntawm cov dub hlau cov khoom, uas yog noj los ntawm tshwj xeeb electrodes ib tug hluav taws xob tam sim no (lub cathode), thiab ntshiab zinc los yog nyob rau hauv daim ntawv ntawm cov phiaj khoom ntim rau hauv tshwj xeeb mesh khej (anode).

Thaum lub sij hawm electrochemical cov tshuaj tiv thaiv nyob rau hauv tus ntawm ib tug hluav taws xob tam sim no ceev 1 mus rau 5 A / dm zinc yaj nyob rau hauv lub ntsha, thiab ces nws ions tso rau lub cathode tsim tau ib plating thickness ntawm 4-25 microns.

Hais tias yog, siv cov txheej txheem no yog tau fasteners (bolts thiab ceev) nrog uniform thiab ci iab txheej.

Suab kab rau galvanizing

Niaj hnub nimno galvanizing kab - yog ib tug tag nrho cia li kab, uas ua rau tag nrho cov kauj ruam ntawm txheej, xws li vuam thiab degreasing ntawm cov khoom tsis zoo sib txawv ntawm cov zog thiab cov kev configuration.

Tsis Siv Neeg kab feem ntau muaj ib tug txheej ntawm hauj plating da, modular rectifiers, loading / unloading lub rooj muag zaub, thauj khoom, khoom rau qhov cua, dej thiab paug dej, hlau ncej nrog ntaiv txij nkawm.

Electroplating da yuav tsum ua los ntawm steel hlau, hlau, hlua nrog yas los sis roj hmab. Niaj hnub nimno da dej, welded los ntawm daim ntawv polymers yog nce hloov hlau poom. Xaiv da khoom yog nyob ntawm cov muaj pes tsawg leeg thiab concentration ntawm ntsha thiab cov kev khiav hauj lwm kub.

Communications dej thiab sewerage tshuab, thiab nyob rau hauv Feem ntau pov tseg nyob rau hauv lub cua da thiab kuj ua los ntawm polypropylene.

Lub qhov ntev ntawm txoj kab txiav txim los ntawm lub peev xwm thiab qhov ntev ntawm galvanic da.

Galvanizing yuav siv sij hawm qhov chaw nrog rau cov tsim ntawm khib nyiab dej nrog ib tug high school cov concentration ntawm hnyav hlau ions. Yog li ntawd, lawv tus kws lijchoj, lim, neutralized, siv cov pa tshuaj deposition, thiab lwm yam sorption dab nyob rau hauv ntim ua los ntawm engineering polymers.

Zinc electroplating nyob rau hauv tsev

Galvanizing, ua lawv tus kheej txhais tes, nws pib nrog cov xaiv ntawm cov ntaub ntawv. Lub ntsha tej zaum yuav ib tug tov ntawm zinc chloride thiab hydrochloric acid nyob rau hauv distilled dej. Qhov no thiaj li hu ua soldering acid, uas yog feem ntau siv rau hauv lub tsev. Craftsmen etched zinc nyob rau hauv sulfuric acid thiab cov roj teeb npaj ZnSO ₄ ntsha, tab sis txoj kev no yog txaus ntshai, vim hais tias cov tshuaj tiv thaiv ua kub thiab heev hydrogen. Lub ntsha nyob rau hauv txhua rooj plaub yuav tsum tsis txhob yuav ib tug precipitate ntawm insoluble ntsev muaju.

Ntshiab zinc yuav yuav nyob rau hauv ib lub khw tshuaj reagents los yog nyob rau hauv lub xov tooj cua, thiab muaj peev xwm yuav tau los ntawm cov ntsev roj teeb los yog fuses, fwm los ntawm cov Soviet Union.

Galvanic da dej yuav ua tau ib tug iav los yog yas ntim. Nws sawv mus teem lub anode thiab cathode. Lub anode - ib tug zinc phaj, uas yog kev cob cog rua ntawm lub hwj huam mov "plus". Qhov ntau lub anode, lub ntau yam ib tug txheej on lub cathode khoom uas yog thov tiv thaiv txheej. Lub anode tej zaum yuav ib tug me ntsis, lawv yuav tsum tau muab tso rau ib ncig ntawm lub cathode nyob rau tib lub deb mus rau qhov chaw ntawm lub zinc coated uniformly thiab ib txhij rau tag nrho cov sab. Yuav kom ib tug cathode kev cob cog rua "rho tawm" hwj chim qhov twg los.

Txawm tias thaum nyob rau hauv tsev ua galvanizing plating technology tas muaj xws li ua tib zoo tu thiab degreasing ntawm qhov chaw, raws li zoo raws li nws cov ua kom nyob rau hauv ib tug acid tshuaj.

Hwj chim Mov - qhov no yog ib lub tsheb roj teeb nrog rau ib qho incandescent teeb ntawm uas tsis muaj zog los yog lwm yam neeg nyob rau hauv lub Circuit Court tam sim no nyob rau hauv lub Circuit Court yog hauv qab no los yog fais fab mov nrog ib tug qhov voltage ntawm cov qhov tso zis. Qhov loj tshaj plaws yog hais tias muaj yog tsis muaj sai kub ntawm lub ntsha thaum lub sij hawm galvanizing.

Ua tau galvanizing tshwm sim thaum lub anode thiab cathode yog omitted nyob rau hauv lub ntsha thiab cov hluav taws xob Circuit Court yog kaw. Lub ntev hauv tus txheej txheem, lub thicker lub zinc txheej tau nyob rau hauv cov khoom.

Nrog galvanizing tiv thaiv txheej ntawm cov khoom tiav niam txiv leej, niaj hnub thiab du, nrog ib tug zoo nkauj ntxim. Nws yog siv ob qho tib si nyob rau hauv kev lag luam thiab nyob rau hauv tsev, txawm lub fact tias nws yuav siv sij hawm wastewater los ntawm environmentally tej pov tseg.