Kev kho deg ntawm fasteners - electroplating

1】 Electroplating code:

Thaum nws los txog rau kev txheeb xyuas ntawm riveted fasteners, peb tau hais txog cov lej tom qab rau kev kho saum npoo, uas sawv cev rau hom plating ntawm lawv qhov chaw.

Hauv qab no, peb tau sau cov ncauj lus kom ntxaws txog qee txoj kev kho mob saum npoo uas feem ntau siv hauvfasteners. Cov lus hauv qab no qhia tau hais tias:

2 】, Hais txog electroplating:

Electroplating yog txheej txheem txheej txheej fasteners nrog cov hlau txheej los hloov lawv cov khoom nto thiab tiv thaiv oxidation thiab corrosion. Cov txheej hlau feem ntau yog ua los ntawm cov hlau uas tiv taus corrosion.

Electroplating tsis tsuas yog txhim kho corrosion kuj ntawm fasteners, tab sis kuj nce hardness los tiv thaiv hnav, txhim kho conductivity, tshav kub tsis kam, thiab ua kom nto smoother thiab ntau aesthetically pleasing.

Electroplating yog txheej txheem ntawm kev siv electrolysis los txuas cov yeeb yaj kiab hlau rau saum npoo ntawm cov hlau lossis lwm yam ntaub ntawv. Hauv qab no yog cov lus qhia luv luv rau qee cov txheej txheem siv rau cov fasteners.

1. Electrogalvanizing

Electrogalvanizing yog feem ntau siv txheej rau fasteners, uas muaj ib tug zoo tsos thiab kuj pheej yig. Nws tuaj nyob rau hauv cov xim xws li dawb zinc, xiav zinc, xim zinc, thiab dub zinc. Piv nrog rau lwm cov hlau txheej, zinc yog ib qho pheej yig thiab yooj yim rau electroplate hlau. Txawm li cas los xij, nws qhov kev tiv thaiv corrosion yog qhov nruab nrab, thiab qhov nruab nrab ntsev tshuaj tsuag ntawm zinc plating siv sijhawm tsawg dua 72 teev. Tau kawg, cov neeg ua haujlwm sib khi tshwj xeeb kuj tau siv, uas tuaj yeem ua rau qhov nruab nrab ntsev tsuag tshuaj ntsuam ntau tshaj 200 teev. Txawm li cas los xij, tus nqi yog 5-8 npaug kim dua li cov zinc plating zoo tib yam.

Daim duab hauv qab no qhia tau hais tiasntsia hlauplated nrog xiav thiab dawb zinc:

Daim duab hauv qab no qhia tau hais tiasboltsrau electroplating xim zinc:

2. Electroplated npib tsib xee

Electroplated npib tsib xee fasteners feem ntau yog siv rau hauv cov cheeb tsam uas xav tau ob qho tib si corrosion kuj thiab zoo conductivity. Lub stability ntawm electroplated npib tsib xee txheej hauv huab cua yog siab heev. Vim muaj zog passivation muaj peev xwm ntawm hlau npib tsib xee, ib tug nyias nyias passivation zaj duab xis tuaj yeem tsim sai sai rau saum npoo, uas tuaj yeem tiv taus qhov corrosion ntawm huab cua, alkali, thiab qee cov kua qaub. Electroplated npib tsib xee muaj kev ua haujlwm zoo polishing, thiab nws cov luster tuaj yeem khaws cia ntev ntev tom qab polishing. Ntxiv mus, lub hardness ntau dua ntawm cov nickel txheej tuaj yeem txhim kho qhov hnav tsis kam ntawm fasteners.

Daim duab hauv qab no qhia tau hais tiashexagonal qhov (socket) boltsnrog nickel plating:

3. Oxidation

Oxidation blackening + roj txheej yog txheej nrov rau kev lag luam fasteners vim nws yog qhov pheej yig tshaj plaws thiab zoo li zoo ua ntej noj roj. Nyob rau hauv lub xub ntiag ntawm cov roj, qhov kev ntsuam xyuas ntsev tsuag tuaj yeem kav ntev li 3-5 teev. Qhov sib xws ntawm torque thiab pre nruj quab yuam ntawm blackened fasteners kuj tsis zoo. Yog tias nws yuav tsum tau txhim kho, roj tuaj yeem siv rau hauv cov xov sab hauv thaum sib dhos ua ntej screwing.

Cov duab hauv qab no qhia txog oxidized thiab blackenedbolts:

4. Chromium plating

Kev siv cov chromium plating ntawm fasteners feem ntau yog siv rau kev kho kom zoo nkauj. Lub chromium txheej yog ruaj khov heev nyob rau hauv cov huab cua, tsis yooj yim rau hloov xim thiab poob luster, thiab muaj siab hardness thiab zoo hnav tsis kam. Zoo chrome plated fasteners yog sib npaug kim li stainless hlau, tab sis lawv tsuas yog hloov los ntawm chrome plated fasteners thaum lub zog ntawm stainless hlau tsis txaus. Yog li ntawd, lawv tsis tshua muaj siv nyob rau hauv industrial teb nrog siab tiv thaiv corrosion. Txhawm rau tiv thaiv corrosion, tooj liab thiab npib tsib xee yuav tsum tau plated ua ntej chrome plating. Chromium plating tuaj yeem tiv taus qhov kub siab ntawm 650 degree, tab sis nws muaj qhov teeb meem tib yam ntawm hydrogen embrittlement li electrogalvanizing.

Daim duab hauv qab no qhia tau hais tiasboltsnrog chrome plating:

3 】, Electroplating qauv thiab kev soj ntsuam zoo:

Lub teb chaws tus qauv rau kev kho deg ntawm fasteners GB/T5267.1-2002 yog tus qauv rau electroplating txheej ntawm threaded fasteners. Cov txheej txheem no suav nrog ob tus qauv: GB / T5267.1-2002 electroplating txheej ntawm fasteners thiab GB / T5267.2-2002 tsis yog electrolytic zinc txheej txheej ntawm fasteners. Cov qauv no yog sib npaug rau cov txheej txheem thoob ntiaj teb ISO4042-1999 rau electroplating txheej ntawm threaded fasteners.

Lub hom phiaj tseem ceeb ntawm kev kho deg ntawm fasteners yog txhawm rau txhim kho lawv cov kev tiv thaiv corrosion thiab ua kom lawv muaj kev ntseeg siab thiab yoog raws. Lub ntsiab ntsuas yog corrosion kuj, ua raws li cov tsos.

Qhov zoo ntawm electroplating txheej ntawm fasteners yog tsuas yog txiav txim los ntawm cov nram qab no yam:

1. Kev tshuaj xyuas qhov muag

Qhov saum npoo ntawmfastenersyuav tsum du, nrog zoo glossiness thiab tsis muaj plating txheej. Yuav tsum tsis muaj av, pores, pinholes, tev, scorched txheej, npub, tev, tawv nqaij, thiab pom tseeb kab txaij, nrog rau cov pits, dub plating slag, xoob, tawg, tev tawm passivation zaj duab xis, thiab cov cim passivation loj heev.

2. Txheej thickness

Cov txheej thickness ntawm fasteners yog ncaj qha cuam tshuam rau lawv corrosion kuj nyob rau hauv cov huab cua, tab sis yog hais tias nws yog tuab heev, xov cuam tshuam yuav tshwm sim thaum lub installation. Nws raug pom zoo kom muaj txheej tuab ntawm 4-12um feem ntau.

Qhov nruab nrab thickness ntawm kub-dip galvanizing tus qauv yog 54 um (43 um rau diameters tsawg dua los yog sib npaug rau 3/8), thiab qhov tsawg kawg nkaus thickness yog 43 um (37 um rau diameters tsawg dua los yog sib npaug rau 3/8).

3. Txheej txheej

Lub aggregation ntawm coatings nyob rau saum npoo ntawm fasteners txawv nrog txawv deposition txoj kev. Thaum lub sij hawm electroplating, cov hlau txheej tsis sib npaug ntawm cov npoo sab nrauv, thiab cov txheej tuab yog tau txais ntawm cov ces kaum. Nyob rau hauv lub threaded ib feem ntawm lub fastener, lub thickest txheej yog nyob rau sab saum toj ntawm cov xov, maj mam thinning nyob rau sab ntawm cov xov, thiab depositing lub thinnest txheej nyob rau hauv qab ntawm cov xov.

Ntawm qhov tod tes, kub-dip galvanizing yog qhov opposite, nrog thicker coatings depositing ntawm lub puab ces kaum thiab nyob rau hauv qab ntawm threads. Cov hlau deposition nyiam ntawm cov neeg kho tshuab plating yog tib yam li kub-dip galvanizing, tab sis nws yog smoother thiab muaj ib tug ntau ntau yam thickness ntawm tag nrho cov nto.

4. Hydrogen embrittlement

Thaum lub sij hawm ua thiab kho cov fasteners, tshwj xeeb tshaj yog thaum lub sij hawm acid thiab alkali ntxuav ua ntej plating thiab tom ntej electroplating txheej txheem, lub nto absorbs hydrogen atoms thiab generates hydrogen thaum lub sij hawm deposition txheej txheem. Thaum lub fastener yog nruj, hydrogen yog pauv mus rau feem ntau concentrated ib feem ntawm qhov kev ntxhov siab, ua rau lub siab nce siab tshaj nws lub zog thiab ua rau me me pob txha tawg. Hydrogen nkag mus rau hauv cov kab nrib pleb tshiab. Lub voj voog ntawm lub siab rupture infiltration txuas ntxiv mus txog thaum lub fastener tawg. Feem ntau tshwm sim hauv ob peb teev tom qab thawj daim ntawv thov kev ntxhov siab. Txhawm rau tshem tawm cov kev hem thawj ntawm hydrogen embrittlement, fasteners yuav tsum tau muab rhaub thiab ci hauv 3 teev tom qab plating kom cov hydrogen nkag mus ntawm txheej, feem ntau ntawm qhov kub ntawm ib ncig ntawm 200 degree, thiab lub sijhawm ua haujlwm yog txiav txim siab raws li lawv. xav tau lub zog tensile.

Vim lub fact tias mechanical galvanizing tsis yog electrolyte, nws zoo tshem tawm cov kev hem thawj ntawm hydrogen embrittlement, yog li kub-dip galvanized fasteners tsis tshua muaj hydrogen embrittlement.

4 】, Kev kho cua sov ntawmfasteners:

Kev kho cua sov yog cov txheej txheem ntawm cov cua sov, rwb thaiv tsev, thiab cua txias fasteners los hloov lawv cov qauv sab hauv thiab ua tiav cov kev xav tau, lub koom haum, thiab cov qauv. Annealing, normalizing, quenching, thiab tempering yog "plaub hluav taws" hauv kev kho cua sov, cov uas quenching thiab tempering yog ze ze thiab feem ntau siv ua ke.

Annealing yog cov txheej txheem ntawm cua sov lub workpiece mus rau qhov tsim nyog kub thiab tuav nws rau ib lub sij hawm ntawm lub sij hawm, ces maj mam txias nws mus cuag los yog mus kom ze rau ib tug equilibrium lub xeev ntawm nws cov qauv, tso cai rau lub internal kev nyuaj siab generated los ntawm cov txheej txheem dhau los tso tawm. , thiab tau txais cov txheej txheem zoo thiab kev siv tau zoo raws li kev npaj rau kev quenching ntxiv.

Normalizing yog txheej txheem ntawm cua sov lub workpiece mus rau ib tug haum kub thiab ces txias nws nyob rau hauv huab cua. Cov nyhuv ntawm normalizing zoo ib yam li annealing, tab sis qhov tshwm sim microstructure yog finer thiab feem ntau yog siv los txhim kho tej kev ua tau zoo ntawm cov ntaub ntawv. Nws tuaj yeem siv los ua kev kho cua sov zaum kawg rau qee qhov chaw uas tsis tshua muaj.

Quenching yog qhov cua txias sai sai ntawm cov khoom ua haujlwm hauv qhov nruab nrab quenching xws li dej, roj, lossis lwm yam tshuaj ntsev inorganic lossis cov organic dej daws tom qab cua sov thiab rwb thaiv tsev.

Tempering yog hais txog tuav lub quenched workpiece ntawm qhov tsim nyog kub saum chav tsev kub tab sis qis dua 650 degree rau ib lub sij hawm ntev, ua raws li los ntawm txias, uas yuav txo tau lub brittleness ntawm quenched workpiece.

Plaub qhov hluav taws kub hloov mus rau hauv cov txheej txheem kev kho cua sov sib txawv nrog cov cua kub sib txawv thiab cov txheej txheem txias. Cov txheej txheem ntawm kev sib txuas quenching thiab high-temperature tempering kom tau ib theem ntawm lub zog thiab toughness yog hu ua quenching thiab tempering.