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Workpiece → degreasing → kugeza mvura → pickling → kugeza mvura → kunyudzwa mukubatsira plating solvent → kuomesa uye preheating → inopisa-dip galvanizing → kupedza → kutonhora → passivation → kugezesa → kuomesa → kuongorora
(1) Kuderedza mafuta
Chemical degreasing kana mvura-based metal degreasing cleaning agent inogona kushandiswa kuderedza kusvikira workpiece yanyatsonyoroveswa nemvura.
(2) Kunhonga
Inogona kubikwa neH2SO4 15%, thiourea 0.1%, 40~60℃ kana HCl 20%, hexamethylenetetramine 1~3g/L, 20~40℃. Kuwedzerwa kwe corrosion inhibitor kunogona kudzivirira matrix kubva pamusoro-kuora uye kuderedza kutorwa kwehydrogen kwesimbi matrix. Kusakwana kwekudzikisira uye kurapwa kunokonzeresa kusanamatira kwekuputira, pasina zinc yekuputira kana peeling ye zinc layer.
(3) Kunyudzwa kwemvura
Iyo inozivikanwawo se bonding agent, inogona kuchengetedza basa risati ranyudza plating kuti riwedzere kubatana pakati peplating layer uye substrate. NH4Cl 15%~25%, ZnCl2 2.5%~3.5%, 55~65℃, 5~10min. Kuti uderedze NH4Cl volatilization, glycerin inogona kuwedzerwa zvakakodzera.
(4) Kuomesa uye preheating
Kuti udzivise workpiece kubva pakuremara nekuda kwekukwira kwakanyanya kwekushisa panguva yekunyudzwa, uye kubvisa hunyoro hwakasara, kudzivirira kuputika kwezinc, zvichikonzera kuputika kwe zinc fluid, preheating inowanzo 120-180 ° C.
(5) Kupisa-dip galvanizing
Izvo zvinodiwa kudzora tembiricha ye zinc mhinduro, nguva yekunyura uye nekukurumidza iyo iyo workpiece inobviswa kubva kune zinc mhinduro. Tembiricha yakadzikira, kuyerera kwemvura ye zinc haina kunaka, kupfekedza kwacho kwakakora uye hakuna kuenzana, zviri nyore kugadzira sagging, uye chitarisiko chakashata; iyo tembiricha yakakwira, iyo fluidity ye zinc fluid yakanaka, iyo zinc fluid iri nyore kuparadzanisa kubva kune workpiece, uye chiitiko chekusagika uye wrinkles yakaderedzwa. Yakasimba, yakapfava yakapfava, kutaridzika kwakanaka, yakakwira kugadzirwa kwakanaka; zvisinei, kana kutonhora kwakanyanya, workpiece uye zinc poto ichakuvadzwa zvakanyanya, uye yakawanda yezinc tsvina ichagadzirwa, iyo inokanganisa kunaka kweiyo zinc dipping layer uye inodya yakawanda ye zinc. Panguva imwecheteyo tembiricha, nguva yekunyudza yakareba uye plating layer yakakora. Kana ukobvu hwakafanana huchidikanwa pakupisa kwakasiyana, zvinotora nguva yakareba kunyudza kwepamusoro-tembiricha yekunyudza. Kuti udzivirire kupisa kwakanyanya kweiyo workpiece uye kuderedza zinc tsvina inokonzerwa nekurasikirwa kwesimbi, mugadziri mukuru anotora 450~470℃, 0.5~1.5min. Mamwe mafekitori anoshandisa tembiricha yakakwira kune mahombe ekushanda uye masimbi ekukanda, asi dzivirira tembiricha yemhando yekurasikirwa kwesimbi. Kuti uvandudze kunyungudika kweiyo inopisa dip plating mhinduro pane tembiricha yakaderera, kudzivirira kupfekedza kuti risave gobvu, uye kugadzirisa kutaridzika kwejasi, 0.01% kusvika 0.02% yealuminiyamu yakachena inowanzowedzerwa. Aluminium inofanira kuwedzerwa mune zviduku kakawanda.
(6) kupedza
Kupedzisa workpiece mushure mekuputira kunonyanya kubvisa pamusoro zinc uye zinc nodules, kungave nekuzunungusa kana manyore nzira.
(7) Kufara
Chinangwa ndechekuvandudza kupikisa kwemhepo yakasvibiswa pamusoro pebasa rekushanda, kuderedza kana kurebesa kutaridzika kwevhu chena, uye kuchengetedza kutaridzika kwakanaka kwejasi. Iwo ese akapfuudzwa nechromate, senge Na2Cr2O7 80~100g/L, sulfuric acid 3~4ml/L.
(8) Kutonhodza
Iyo inowanzo kunyoroveswa nemvura, asi tembiricha haifanire kunge yakadzikira kudzivirira iyo workpiece, kunyanya kukanda, kubva pakutsemuka mumatrix nekuda kwekutonhora uye kuderera.
(9) Kuongorora
Kuonekwa kwekuputira kwakajeka, kwakadzama, pasina sagging kana wrinkles. Kuongorora ukuru kunogona kushandisa coating ukobvu geji, iyo nzira iri nyore. Ukobvu hwekuputira hunogonawo kuwanikwa nekushandura huwandu hwezinc adhesion. Simba rekubatanidza rinogona kukotamiswa nemuchina wekupeta, uye sampuli inofanira kunge yakakotama pa90-180 °, uye hapafanirwe kuve nekutsemuka kana peeling yejasi. Inogonawo kuongororwa nekurova nesando inorema.
2. Hot-dip galvanized layer formation process Kugadzira mbiru ye-hot-dip galvanized layer ndiyo nzira yekugadzira iron-zinc alloy pakati pesimbi matrix uye yekunze yakachena zinc layer. Iyo iron-zinc alloy layer inoumbwa pamusoro peiyo workpiece panguva inopisa-dip galvanizing. Iyo simbi uye yakachena zinc layer yakanyatso kubatanidzwa, uye iyo nzira inogona kungorondedzerwa se: kana iyo iron workpiece inonyudzwa mune yakanyungudutswa zinc, yakasimba mhinduro ye zinc uye alpha iron (body core) inotanga kuumbwa pane iyo interface. Iri ikristaro rinoumbwa nekunyungudutsa maatomu ezinc musimbi yepasi pakasimba. Maatomu maviri esimbi akasanganiswa, uye kukwezvana kuri pakati peatomu kudiki. Naizvozvo, kana zinc yasvika pakuzara mumugadziro wakasimba, maatomu maviri ezinc nesimbi anopararira, uye maatomu ezinc anenge apararira (kana kupinda mukati) musimbi matrix anotama mune matrix lattice, uye zvishoma nezvishoma anoita alloy ine. simbi, uye kupararira Simbi uye zingi mu zinc yakanyungudutswa zvinoumba intermetallic compound FeZn13, iyo inonyura muzasi mehot-dip galvanizing poto, iyo inonzi zinc marara. Kana iyo workpiece ichibviswa kubva kune zinc immersion solution, yakachena zinc layer inoumbwa pamusoro, iyo ine hexagonal crystal. Yayo iron content haisi kupfuura 0.003%.
Chechitatu, kushanda kwekudzivirira kwekushisa-dip galvanized layer Ukobvu hwe electro-galvanized layer inowanzoita 5-15μm, uye inopisa-dip galvanized layer inowanzopfuura 65μm, kunyange yakakwirira se100μm. Hot-dip galvanizing ine kufukidzwa kwakanaka, dense coating uye isina organic inclusions. Sezvatinoziva tese, iyo anti-atmospheric corrosion mechanism ye zinc inosanganisira kudzivirira kwemakanika uye kuchengetedzwa kwe electrochemical. Pasi pemamiriro ekuora kwemuchadenga, kune mafirimu ekudzivirira eZnO, Zn(OH)2 uye basic zinc carbonate pamusoro peiyo zinc layer, iyo inogona kuderedza kukora kwe zinc kusvika pamwero wakati. Iyo firimu inodzivirira (inozivikanwawo seye white rust) yakakuvadzwa uye firimu idzva rinoumbwa. Kana iyo zinc layer yakuvadzwa zvakanyanya uye iyo iron matrix iri mungozi, zinc inoburitsa electrochemical kuchengetedza kwematrix. Izvo zvinogoneka zvezinc ndeye -0.76V, uye chiyero chesimbi chinogona kuita -0.44V. Kana zinc nesimbi zvichigadzira microbattery, zinc inonyungudika seanode. Inodzivirirwa se cathode. Zviripachena, hot-dip galvanizing ine zviri nani mumhepo inodzivirira corrosion kune base metal iron pane electro-galvanizing.
Chechina, kuumbwa kwekutonga kwe zinc ash uye zinc slag panguva inopisa-dip galvanizing
Zinc ash uye zinc marara haingokanganisa zvakanyanya kunaka kweiyo zinc immersion layer, asi zvakare inoita kuti iyo yekupfeka ive yakaoma uye inoburitsa zinc nodule. Uyezve, mutengo wekupisa-dip galvanizing unowedzera zvakanyanya. Kazhinji, zinc kushandiswa ndeye 80-120kg pa 1 toni workpiece. Kana iyo zinc ash uye marara zvakakomba, iyo zinc inoshandiswa ichakwira kusvika 140-200kg. Kudzora zinc kabhoni kunonyanya kudzora tembiricha uye kuderedza scum inogadzirwa neiyo oxidation ye zinc fluid surface. Vamwe vagadziri vepamba vanoshandisa jecha refractory, dota remarasha, etc. Nyika dzekune dzimwe nyika dzinoshandisa mabhora e ceramic kana magirazi ane yakaderera thermal conductivity, high melting point, yakaderera chaiyo giravhiti, uye hapana kuita ne zinc fluid, izvo zvinogona kuderedza kupisa kurasikirwa uye kudzivirira oxidation. Iri rudzi rwebhora riri nyore kusundirwa kure neworkpiece, uye haina kunamatira kune workpiece. Side effect. Pakugadzira zinc marara muzinc liquid, inonyanya kuve zinc-iron alloy ine hunyoro hwakanyanya hunyoro hunoumbwa kana iyo iron inonyungudutswa mumvura ye zinc inodarika kunyungudika patembiricha iyi. Zinc iri mutsvina ye zinc inogona kusvika pa95%, inova inopisa-dip galvanizing. Chinokosha kumutengo wepamusoro we zinc. Inogona kuonekwa kubva pakunyungudika kwesimbi mune zinc mvura kuti huwandu hwesimbi yakanyunguduka, kureva, huwandu hwekurasikirwa kwesimbi, hwakasiyana pakupisa kwakasiyana uye nguva dzakasiyana dzekubata. Panenge pa500 ° C, kurasikirwa kwesimbi kunowedzera zvakanyanya nekupisa uye kubata nguva, inenge iri mumutsara wehukama. Pazasi kana pamusoro pehuwandu hwe480~510 ℃, kurasikirwa kwesimbi kunowedzera zvishoma nezvishoma nenguva. Naizvozvo, vanhu vanodaidza 480~510 ℃ iyo yakaipa dissolution zone. Mune ino tembiricha renji, iyo zinc fluid inosvibisa iyo workpiece uye zinc poto yakanyanya kuoma. Kurasika kwesimbi kuchawedzera zvakanyanya kana tembiricha iri pamusoro pe560 ℃, uye zinc inoparadza inoisa matrix yesimbi kana tembiricha iri pamusoro pe660 ℃. . Naizvozvo, kuputira pari zvino kunoitwa munzvimbo mbiri dze450-480°C uye 520-560°C.
5. Kudzora kwehuwandu hwezinc tsvina
Kuti uderedze tsvina ye zinc, zvinodikanwa kuderedza iyo iron yemukati mune zinc solution, inova kutanga nekudzikisa zvinhu zvekuparara kwesimbi:
⑴Kuisa uye kuchengetedza kupisa kunofanirwa kudzivirira nzvimbo yepamusoro yekunyungudika kwesimbi, kureva kuti, usashande pa480~510℃.
⑵ Nesezvinogoneka, iyo zinc poto zvinhu zvinofanirwa kusungirirwa nesimbi mahwendefa ane kabhoni uye yakaderera silicon yemukati. Iyo yakakwira kabhoni yemukati inomhanyisa kukora kwesimbi pani nemvura ye zinc, uye iyo yakakwira silicon yemukati inogona zvakare kukurudzira kukora kwesimbi ne zinc fluid. Parizvino, 08F yepamusoro-mhando kabhoni simbi mahwendefa anonyanya kushandiswa. Kabhoni yayo ndeye 0.087% (0.05%~0.11%), silicon yemukati i ≤0.03%, uye ine zvinhu zvakaita senickel nechromium zvinogona kuvharisa iron kubva pakuora. Usashandise yakajairwa kabhoni simbi, zvikasadaro iyo zinc inoshandiswa ichave yakakura uye hupenyu hwezinc poto huchave hupfupi. Yakarongedzerwawo kushandisa silicon carbide kugadzira zinc inonyungudika tangi, kunyangwe ichigona kugadzirisa kurasikirwa kwesimbi, asi maitiro ekuenzanisira idambudziko zvakare.
⑶Kubvisa slag kazhinji. Tembiricha inotanga kusimudzwa kusvika kumucheto wepamusoro wetembiricha yekuparadzanisa zinc slag kubva kune zinc fluid, yozodzikiswa kusvika pazasi tembiricha, kuitira kuti zinc slag inonyura pasi petangi uye yobva yatorwa. chipunu. Izvo zvikamu zvakaputirwa zvinowira mumvura ye zinc zvinofanirawo kununurwa nenguva.
⑷ Izvo zvinodiwa kudzivirira simbi iri muplating agent kubva pakuunzwa mutangi rezinc ine workpiece. Iyo yakatsvuka-brown iron-ine komputa ichaumbwa kana iyo plating agent inoshandiswa kune imwe nguva yenguva, uye inofanirwa kusefa nguva nenguva. Zviri nani kuchengetedza pH kukosha kweiyo plating agent yakatenderedza 5.
⑸ isingasviki 0.01% aruminiyamu mune yeplating mhinduro inomhanyisa kuumbwa kwemarara. Chiyero chakakodzera chealuminium hachizongovandudza fluidity yemhinduro ye zinc uye kuwedzera kupenya kwekuputira, asi zvakare kubatsira kuderedza zinc marara uye zinc guruva. Huwandu hushoma hwealuminium inoyangarara pamusoro pemvura inobatsira kuderedza oxidation, uye yakawandisa inokanganisa kunaka kwekupotera, zvichikonzera kukanganisa kwemavara.
⑹ Kupisa nekudziya kunofanirwa kuve kwakafanana kudzivirira kuputika uye kupisa kwenzvimbo.

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Nguva yekutumira: Sep-30-2021