Yuav ua li cas txhawm rau txhim kho cov nplaum ntawm txias - dip galvanizing?
Tus yuam sij rau kev txhim kho cov nplaum ntawm txias - dip galvanizing lus dag nyob rau hauv kev daws ob qhov teeb meem tseem ceeb: substrate huv thiab zinc operition tej yam. Qhov no yuav tsum tau ua kom zoo ntawm pretreatment, electroplating tsis, thiab tshaj tawm {{2} {2}- kev kho mob, thaum tseem yuav zam cov khoom tsis zoo los ntawm kev ua haujlwm tsis raug.
1. Cov kev coj ua kom zoo: substrate pretreatment (lub hauv paus rau kev txiav txim siab adhesion)
Daim ntawv cog lus nruab nrab ntawm cov khaub thuas - dip galvanizing txheej thiab cov substrate yog qhov tseem ceeb ntawm kev tso nyiaj tsis zoo ntawm zinc ions rau ntawm ib qho huv si substrate. Roj, nplai, xeb, lossis impurities ntawm cov txheej txheem sab saum toj tuaj yeem ua ncaj qha rau cov txheej zinc thiab cov txheej txheem sib txawv ntawm cov txheej zinc Yog li ntawd, pretrealtic yuav tsum yog "roj- Dawb, xeb} {{free, thiab impurity {{free."
1. Ua kom txhij cov qeb dhuav: tshem roj thiab cov organic teeb meem los ntawm cov sab nraud. Roj (xws li kev ua cov roj nqus thiab xeb tiv thaiv) ua cov txheej hydrophobic ntawm cov npoo av, tabkaum Zinc ion, yuav tsum tau muab tshem tawm kiag li. Ib tug ob -}} Ruam Degreat Strucight yog pom zoo:
Kauj ruam 1: Kev Tshuaj Alkaline Ua Yeeb Yam
Siv kev sib xyaw ntawm 5% {- 10% sodium hydroxide (Naoh) thiab 2-60₂₃) ntawm 50-60℃rau 10-15 feeb. Alkaline Solutions emulsify roj thiab zom lawv rau hauv dej-soluble tshuaj, ua rau lawv haum rau kev tshem cov roj ntxhia thiab roj thiab zaub roj.
Nco tseg: Tom qab soaking, yaug nrog khiav dej 2-3 lub sij hawm los tiv thaiv cov alkaline daws los ntawm corroding lub substrate.
Kauj Ruam 2: Electrolytic degrasing (rau cov roj muaj roj hnyav lossis cov chaw muaj txiaj ntsig)
Yog tias tus pas nrig sab nraud muaj cov roj nruj roj stains (xws li te huab ntshiab lubrichaw cov khoom seem los ntawm kev ua), thov 10-15V DC rau kev sib txuas ua ke (nrog cov substrate txuas nrog cathode). Cov pa taws thiab cov pa roj oxygen thiab cov pa hluav taws xob tsim los ntawm cov tshuaj tiv thaiv hluav taws xob "sawb" cov roj los ntawm cov kiav txhab me me. Ua kom lub sijhawm ntsuas hluav taws xob rau 5-8 feeb tuaj yeem nce cov roj tshem tawm rau 99% {}
Cov nplai (fe₃o₄, feio₃) thiab xeb (feo (Feo (Oh) ntawm cov qauv xoob uas tsis tuaj yeem khi rau cov txheej zinc. Yog li ntawd, tshem tawm kom paub meej yog qhov tseem ceeb. Ob txoj hauv kev yog pom zoo:
Acid tu (haum rau kev ib txwm pawg ntau lawm ntawm cov seem)
Siv ib qho 15% {- 20% hydrochloric acid (HCl) daws thiab soak rau 8-50℃rau 10-15 feeb). Thaum lub sij hawm cov txheej txheem pickling, ntxiv 0.5% -1% ntawm ib qho corrosion inhibitor (xws li hexamine) los tiv thaiv kom tsis txhob muaj qhov tseeb ntawm kev "dhau ntawm-acidification"). Tom qab pickling, yaug nrog dej ntws kom txog thaum lub pH mus txog nruab nrab ntawm nruab nrab (6-7 siv p ntawv xeem ntawv) ua ntej ua ntej. Sandblasting kom xeb tawm ntawm kev tshem tawm (haum rau cov chaw zoo lossis cov ntu nyuaj)
Rau galvanized round round qhov uas yuav tsum tau zoo, sandblasting nrog 80-120 quartz xuab zeb lossis corundum siv 0.5-0.8 mpa motioned cua yuav siv tau. Qhov kev cuam tshuam ntawm lub cev no tau tshem tawm cov nplai thiab xeb thaum tsim ib qho kev sib tw "ntxhib sab" (saum npoo av ra 1.6-3.2 μm) nyob rau sab nraud. Qhov kev sib tw roughened nce qhov chaw tiv tauj ntawm cov txheej zinc thiab lub substrate thiab cov txheej txheem txhim kho los ntawm 20% -30%. Txawm li cas los xij, nws yog ib qho tseem ceeb kom nco ntsoov tias lub electroplating cov txheej txheem yuav tsum pib tsis pub dhau 2 teev tom qab sandlllarlasting kom zam dhau txoj kev oxidation theem nrab ntawm substrate.
3. Kev Kho Mob Kom Tshem Tawm: Tshem tawm cov khoom tsis txaus ntseeg thiab txhim kho zinc ion kos adsorption
Tom qab pickling los yog sandblasting, lw nyiaj ntawm impurities xws li hlau thiab cons ions yuav nyob twj ywm rau ntawm substrate nto, xav tau kev ua kom huv ntxiv los ntawm kev ua haujlwm. Qhov no feem ntau ua tiav los ntawm soaking hauv 1% -2% dilute hydrochloric acid los yog sulfuric acid tov ntawm chav tsev kub rau 1-2 feeb. Qhov no tshem tawm cov ntawv nyias nyias oxide, tawm hauv cov ntsiab lus me me "tshiab thiab nquag," muab cov ntsiab lus txuas zoo rau zinc ion oion. Tom qab kev ua kom muaj zog, nws yuav tsum muab tso rau hauv lub pob hluav taws xob hluav taws xob sai sai kom tsis txhob sib cuag nrog huab cua thiab theem nrab oxidation.