Thaum tshav kub kub-dip galvanizing
1, daim ntawv thov kub ntau ntawm kub-dip galvanized txheej
Feem ntau hais lus, qhov kub ntawm nws daim ntawv thov yog dav heev. Txawm li cas los xij, nws yuav tsum tau muab sau tseg tias kev hloov pauv ntawm cov qauv kub-dip galvanized nyob rau hauv qhov chaw qis qis yog txiav txim siab los ntawm kev hloov pauv ntawm cov hlau, tsis yog los ntawm cov txheej kub-dip galvanized. Piv txwv li, breakage ntawm kub-dip galvanized txheej ntawm qhov kub thiab txias yog feem ntau yog vim txias shrinkage ntawm cov hlau es tsis yog ib tug zoo teeb meem nrog kub-dip galvanized txheej.
Nyob rau hauv atmospheric ib puag ncig, daim ntawv thov ntawm kub-dip galvanized txheej yog yuav luag unlimited.
2, kub-dip galvanized txheej daim ntawv thov kub txwv
Yog vim li cas rau qhov kev txwv dav dav tsawg dua lossis sib npaug li 220 degree yog tias qhov sib txawv ntawm Zn-Fe tuaj yeem tshwm sim yog tias qhov kub thiab txias siab dua.
Kub-dip galvanized txheej ntawm Zn-Fe vim qhov sib txawv ntawm qhov sib txawv, yuav ua rau kub-dip galvanized txheej tawm, thiab tej zaum yuav tshwm sim nyob rau hauv cov hlau substrate embrittlement, tawg, qhov tshwm sim no yog. tseem hu ua "Kirkendall effect".
Kub kub tsis kam ntawm galvanized ntawv
High zinc txheej yog hais txog txheej tuab heev, yog siv rau kub-dip galvanizing, vim electro-galvanizing tsis tuaj yeem plated tuab heev. Lub thickness ntawm kub-dip galvanized txheej feem ntau yog ntau tshaj 20 microns, thiab txawm mus txog 100 microns. Qhov hnyav ib square meter ntawm txheej galvanized feem ntau yog hais txog 145 g / m2 thiab txheej yog li 20 microns. Txawm li cas los xij, nws tsis yooj yim los khaws cov thickness ntawm kub-dip galvanizing kuj nyias.
Zinc muaj qhov melting point ntawm 419.5 degree thiab yog tshuaj lom neeg. Nyob rau hauv chav tsev kub, ib tug nyias, ntom zaj duab xis ntawm alkaline zinc carbonate cov ntaub ntawv nyob rau saum npoo ntawm huab cua zinc, uas tiv thaiv oxidation ntxiv. Thaum qhov kub txog 225 degree, zinc oxidizes hnyav, qhia cov zinc oxide dawb. Tom qab kub kub barbecue, anti-corrosion txheej nyob rau saum npoo ntawm daim ntawv galvanized yog oxidized, yog li cov ntawv galvanized tsis tuaj yeem tiv taus qhov kub thiab txias, qhov kub thiab txias yuav tsis muaj xim, los yog oxidation ntawm cov nplaim ntawm lwm cov tshuaj tiv thaiv yog nquag. rau yellowing.
Qhov saum npoo ntawm daim ntawv galvanized yuav tsum tsis muaj stains lossis hmoov av xws li roj lossis siv quav ciab, uas tuaj yeem txhim kho qhov adhesion ntawm atomic tshauv;
Txoj kev xav, nws tsis pom zoo kom ua topcoats los yog primers nyob rau hauv lub hauv paus ntawm zoo xws li cov ntaub ntawv galvanized uas du heev. Yog tias tsim nyog, kev kho etching (xws li hydrochloric acid) yuav tsum tau ua txhawm rau txhawm rau txhim kho lub zog adhesion rau atomic tshauv thiab xim;
Atomic tshauv yuav tsum tau hloov kho kom haum raws li tus qauv piv ntawm cov proportional kev sib raug zoo nrog tus neeg sawv cev curing, qhov feem ntawm cov loj heev yuav txo cov adhesion thiab lub cev khoom ntawm atomic tshauv (xws li ntau brittleness, poob ntawm toughness);
Sim siv Natomax tshauv nyob rau hauv lub sij hawm lav thiab nyias txheej, los tiv thaiv qhov chaw thiab substrate galvanized phaj kub sib txawv loj heev, ua rau inconsistent kev ntxhov siab, shrinkage, expansion, delamination, thiab thaum kawg sib cais kiag li.
Kev kho chromate yuav tsum yog passivation. Tom qab kev kho mob rau kub dip galvanizing muaj xws li passivation, pre-phosphating thiab oiling. Passivation kev kho mob tuaj yeem txhim kho cov qauv saum npoo thiab luster ntawm txheej galvanized, txhim kho corrosion kuj thiab kev pab cuam lub neej ntawm galvanized txheej, thiab txhim kho kev sib xyaw ntawm cov txheej thiab lub hauv paus hlau. Tam sim no, kev kho mob passivation feem ntau yog siv chromate passivation. Nyob rau hauv cov tshuaj passivation ntxiv ib co activators, xws li fluoride, phosphoric acid los yog sulfuric acid, yog li ntawd tom qab passivation kom tau ib tug tuab txheej ntawm chromate zaj duab xis.
Lub xub ntiag ntawm fluoride nyob rau hauv cov tshuaj passivation tuaj yeem txo qhov nro ntawm cov hlau sawb, ua kom cov yeeb yaj kiab tsim cov tshuaj tiv thaiv, ua kom cov tshuaj polishing nyhuv, kom cov zaj duab xis passivation zoo thiab ci. Molybdate yog ib tug ntawm lawv, nws toxicity yog qis dua chromate, tab sis corrosion kuj tom qab passivation tsuas yog sib npaug rau tsawg chromium passivation. Qee cov txheej txheem chrome-dawb passivation hauv qee yam thiab chromate passivation yog sib npaug, tab sis nws txoj kev cia siab rau kev ua lag luam, daim ntawv thov kev siv thiab kev cuam tshuam ib puag ncig yuav tsum tau kawm ntxiv. Txawm li cas los xij, chrome-dawb passivation es tsis txhob chromate passivation yog qhov sib txawv.
