Rau cov ntsia hlau fasteners ntau lawm, kev kho deg yog txheej txheem nrog qhov tsis tuaj yeem, ntau tus neeg muag khoom hauv kev nug txog cov ntsia hlau fasteners, txoj kev kho saum npoo, cov txheej txheem network raws li cov ntaub ntawv sau tseg txog qhov saum npoo ntawm cov ntsia hlau fasteners ntau txoj hauv kev muaj yim yam. ntawm cov ntaub ntawv, xws li: dub (xiav), phosphating, kub dip zinc, dacromet, hluav taws xob galvanized, chrome plating, npib tsib xee thiab zinc impregnation.Lub fastener ntsia hlau nto kho yog los ntawm ib txoj kev los tsim ib txheej txheej ntawm lub workpiece, nws lub hom phiaj yog ua kom cov nto ntawm cov khoom zoo nkauj, anti-corrosion nyhuv.
Yim txoj kev kho saum npoo rau fastener screws:
1, Dub (xiav)
Cov fasteners yuav tsum tau kho nrog dub tau muab tso rau hauv lub tank tov (145 ± 5 ℃) ntawm sodium hydroxide (NaOH) thiab sodium nitrite (NaNO2) oxidant cua sov thiab oxidation, nto ntawm cov hlau fasteners tsim ib txheej ntawm hlau nplaum Fe3O4 (Fe3O4). ) zaj duab xis, thickness feem ntau yog 0.6 - 0.8μm dub lossis xiav dub.Ob qho tib si HG / 20613-2009 thiab HG / T20634-2009 tus qauv rau fasteners siv nyob rau hauv cov hlab ntsha siab yuav tsum tau ua xiav.
2, Phosphating
Phosphating yog ib txheej txheem ntawm kev tsim cov tshuaj phosphate tshuaj hloov dua siab tshiab los ntawm cov tshuaj lom neeg thiab cov tshuaj electrochemical.phosphate conversion film hu ua phosphating film.Lub hom phiaj ntawm phosphating yog los muab kev tiv thaiv rau lub hauv paus hlau thiab tiv thaiv cov hlau los ntawm corroded mus rau ib qho twg.Siv ua primer ua ntej pleev xim los txhim kho qhov adhesion thiab corrosion kuj ntawm cov xim zaj duab xis;Nws tuaj yeem siv los txo kev sib txhuam thiab lubrication hauv cov txheej txheem hlau ua haujlwm txias.Tus qauv rau txoj kab uas hla loj ob - taub hau studs rau cov hlab ntsha siab yuav tsum tau phosphating.
3, Kub dip galvanizing
Kub zinc dipping yog rau raus cov neeg hlau tom qab xeb tshem tawm mus rau hauv cov tshuaj zinc melted ntawm qhov kub thiab txias ntawm li 600 ℃, yog li ntawd cov neeg sab nrauv steel txuas nrog zinc txheej.Lub thickness ntawm zinc txheej yuav tsum tsis pub tsawg tshaj 65μm rau nyias phaj tsawg dua 5 hli, thiab tsis tsawg tshaj li 86μm rau tuab phaj 5 hli thiab siab dua.Yog li ua si lub hom phiaj ntawm kev tiv thaiv corrosion.
4. Dacroll
DACROMET yog DACROMET txhais lus thiab cov ntawv luv, DACROMET, DACROMET xeb, Dicron.Nws yog ib qho tshiab anticorrosive txheej nrog zinc hmoov, txhuas hmoov, chromic acid thiab dej deionized ua cov khoom tseem ceeb.Tsis muaj teeb meem hydrogen embrittlement, thiab torque-preload sib xws yog qhov zoo heev.Yog hais tias ib puag ncig tiv thaiv ntawm hexavalent chromium tsis raug suav hais tias, nws yog qhov tsim nyog tshaj plaws rau lub zog siab fasteners nrog siab tiv thaiv corrosion.
5, Hluav taws xob galvanizing
Electrogalvanizing, tseem hu ua txias galvanizing nyob rau hauv kev lag luam, yog cov txheej txheem ntawm kev siv electrolysis los ua ib tug uniform, ntom thiab zoo-combined hlau los yog alloy deposition txheej rau saum npoo ntawm lub workpiece.Piv nrog rau lwm yam hlau, zinc kuj pheej yig thiab yooj yim rau lub tsho tiv no hlau, tsis tshua muaj nqi corrosion kuj electroplating, yog dav siv los tiv thaiv steel qhov chaw, tshwj xeeb tshaj yog tiv thaiv atmospheric corrosion, thiab siv rau kho kom zoo nkauj.Cov txheej txheem plating muaj xws li qhov plating (los yog dai plating), yob plating (tsim rau qhov me me), plating xiav, tsis siv neeg plating thiab nruam plating (tsim rau hlau, sawb).
Electrogalvanizing yog feem ntau siv txheej rau kev lag luam fasteners.Nws yog pheej yig dua thiab zoo dua saib, thiab tuaj yeem tuaj yeem dub lossis ntsuab ntsuab.Txawm li cas los xij, nws qhov kev ua tau zoo los tiv thaiv corrosion yog dav dav, nws cov kev ua haujlwm tiv thaiv corrosion yog qis tshaj hauv zinc plating (txheej) txheej.General electrogalvanizing nruab nrab ntsev tsuag tshuaj ntsuam xyuas nyob rau hauv 72 teev, kuj tseem muaj kev siv cov sealant tshwj xeeb, ua qhov nruab nrab ntsev tsuag tshuaj ntsuam ntau tshaj 200 teev, tab sis tus nqi yog kim, yog 5 ~ 8 npaug ntawm galvanizing.
Fasteners rau cov khoom siv feem ntau yog xim zinc thiab dawb zinc, xws li 8.8 qib kev lag luam bolts.
6, Chrome plated
Chrome plating feem ntau yog los txhim kho qhov tawv tawv, kev zoo nkauj, tiv thaiv xeb.Chromium plating muaj tshuaj ruaj khov zoo thiab tsis hnov mob hauv alkali, sulfide, nitric acid thiab feem ntau cov organic acids, tab sis yog soluble hauv hydrohalic acid (xws li hydrochloric acid) thiab kub sulfuric acid.Chromium zoo dua rau cov nyiaj thiab npib tsib xee vim nws tsis hloov xim thiab khaws nws qhov kev xav tau ntev thaum siv.
7, Nickel plating
Nickel plating feem ntau yog hnav-tiv taus, tiv thaiv corrosion, tiv thaiv xeb, feem ntau nyias nyias ntawm cov txheej txheem muab faib ua electroplating thiab tshuaj lom neeg ob pawg.
8, Zinc impregnation
Lub hauv paus ntsiab lus ntawm cov hmoov zincizing tshuab yog muab cov zincizing tus neeg sawv cev thiab cov hlau thiab hlau nyob rau hauv lub qhov cub zincizing thiab cua sov txog li 400 ℃, thiab cov zinc atoms nquag yuav nkag mus rau hauv cov hlau thiab hlau los ntawm sab nraud mus rau sab hauv.Nyob rau tib lub sijhawm, cov hlau atoms kis tau los ntawm sab hauv tawm, uas tsim cov zinc-hlau intermetallic compound, lossis zinc txheej, ntawm qhov chaw ntawm cov hlau.
Post lub sij hawm: Oct-30-2021