Cov ncauj lus kom ntxaws piav qhia ntawm electrogalvanized Bolt Nto Kev Kho
Apr 09, 2025
Hauv kev lag luam nrawm nrawm,4. {{{{}}} Qib hex boltsyog ntawm cov qauv siv dav tshaj plaws. Dhau li ntawm Nees passivation, electrogalvanizing (txias galvanizing (txias galvanizing) thiab kub-dip galvanizing yog ob txheej txheem kev kho kom zoo rau cov bolts.Hexagon socks taub hau cap screws, tshwj xeeb, cia siab, cia siab rau ntawm electrogalvanizing vim lawv cov txheej txheem ua kom ua ke thiab ua kom sib dhos. Tus txheej txheem no txhim kho corrosion tsis kam thiab kev thov kom zoo nkauj: lub sijhawm electrochemically
I. Cov ntsiab cai thiab cov yam ntxwv tseem ceeb ntawm electrogalvanizing
Electrogalvanizing yog Cathodic Electrial Accionipition nrog cov ntsiab lus hauv qab no:
Cathode (workpiece): Cov ntsia liaj qhov rooj ua raws li cathode txuas nrog qhov tsis zoo ntawm DC cov khoom siv fais fab. Kev tawm tsam txo tau tshwm sim rau nws sab, qhov twg zinc ions yog txo kom muaj hlauic zinc thiab tso (cov tshuaj tiv thaiv:Zn²⁺ + 2 → Zn).
Anode (soluble electrode): Ib qho zinc phaj pab tau raws li anode txuas nrog lub davhlau ya nyob twg. Cov tshuaj tiv thaiv oxidation yaj zinc phaj, replenishing zinc ions hauv electrolyte (tshuaj tiv thaiv cov tshuaj (cov tshuaj tiv thaiv kab mob:Zn - 2 ⁻ → Zn²⁺).
Kev Ntsuas Electrolyte: Tsim tau feem ntau ntawm cov ntsev ua si (piv txwv li, zso₄, nrog cov ntsev ua kom huv si (piv txwv li cov neeg tsiv teb tsaws chaw
Qhov tseem ceeb sib txawv ntawm kub-dip galvanizing yog raws li hauv qab no:
| Txheej Txheem Parameter | Electrogalvanizing (txias galvanizing) | Kub-DIP Galvanizing |
|---|---|---|
| Kev Kho Mob Kub | Ambient (20-50 degree) | Kev kub-kub (450-480 degree) |
| Txheej Txheej Txheem Mechanism | Electrochemical Tso | Metallurgical diffusion |
| Txheej Thickness | 5–15μm | 50-80μm (Rau Hlau) |
| Nto roughness | Ra tsawg dua los yog sib npaug rau 0. 2μm (txheej ci) | Ra ntau dua lossis sib npaug rau 1. 0 μm (ntxhib txheej) |
| KEV SIV QHOV TSEEB | Precision / complex Cheebtsam | Cov Qauv Loj |
Ii. Cov txheej txheem kev kho qauv
1. PretReatment (tseem ceeb rau txheej kom zoo)
Ncab: Ultrasonic tu nrog Alkaline Degreat cov neeg sawv cev (Naoh + surfactants) tshem tawm cov ntxhia roj thiab txiav cov roj seem, tiv thaiv cov roj paug, tiv thaiv cov roj paug zinc ion adsorption.
Pickling oblation (tsim nyog rau nruab nrab-siab carbon hlau):
8. {8-} bolts bolts(nruab nrab cov pa roj carbon steel) yog raus hauv 15-20% hydrochloric acidFe₃o₄ + 8 hc → 2fecl₃ + Feclo {3}} h₂oCov. Tom qab pickling, lawv yog neutralized nrog 5% sodium carbonate daws thiab yaug cov dej tawm kom txog thaum nruab nrab (ph}. 5-7.5).
Me etching: A 5% dilute sulfuric acid dip (3-5 vib nas this) tshem tawm cov duab passivation ua ntej plating, kom muaj kev ua si acttrate.
2. Electrogalvanizing Depositionition
Da dej: Nrig ntom ntom nti 1-3a / density (ntev dhau los ua rau kub hnyiab, tsis txaus ntseeg los ua rau muaj cov txheej txheem hluav taws xob), ntsuas kub, pH 4.5-5 acidic ib puag ncig dologen evolution). Lub sijhawm plating yog tswj hwm los ntawm ampere-teev ntsuas ntsuas raws li lub hom phiaj tuab (piv txwv li, 30 feeb rau 8μm).
Cov Khoom Txhiab Txheej: Cov txheej zinc yog cov khoom siv thiab ntom, muaj peev xwm kho cov khawb me me lossis xeb cov pits (kev sib tsoo tshuab yog yuav tsum tau ua ntej).
3. Tom qab kev kho mob
Passivation cov txheej txheem:
Xiav-Dawb Passivation (Charomium Charomium): Ntsev tshuaj tsuag ntsev 48-72 teev, xiav-dawb glossy tiav, ib puag ncig phooj ywg.
Zaj sawv tus neeg caij Passivation (Hexavalent Chromium, pasing tawm): Salt spray test >100 teev, multicolored tiav, superior corrosion tsis kam.
Chromium-Dawb Passiveation (Titanium / Molybdate): Ntsev tshuaj tsuag ntev 36-48 teev, nyiaj-dawb tiav, ua raws li ROHS cov qauv.
Kev Kho Shoing: Cov yeeb yaj kiab dej-doluble tau thov rau xov los sau cov txheej txheej xim, txhim kho tsis kam rau noo noo thiab av noo (tshwj xeeb yog rau cov khoom siv hluav taws xob).
III. Kev sib piv nrog lwm cov txheej txheem kho cov txheej txheem
| Kev ua | Muaj cov khoom siv | TXHEEJ YAM | Qhov tuab | Kev Ntsuas Cov Ntsev | Cov Kev Siv Raug Raug |
|---|---|---|---|---|---|
| Electrogalvanizing | Hlau Qhov | Nws yog xim hlau zinc txheej | 5–15μm | 48-100 teev | Precision Bolts, Hluav Taws Xob Hluav Taws Xob |
| Kub-DIP Galvanizing | Hlau Qhov | Zinc-Hlau Alloy Txheej | 50–80μm | >500 teev | Sab nraum zoov steel qauv, tus choj bolts |
| Anodic oxidation | Txhuas / Txhuas Alloys | Aluminium Oxide Zaj Duab Xis | 5–25μm | 200-500 teev | Aluminium Fasteners, Aerospace Qhov Chaw |
| Kem dacromet | Hlau / Aluminium-Raws Li Alloys | Chromium-Dawb Zinc-Raws Txheej | 6–8μm | >1000 teev | High-corrosion resistance carotive bolts |
Nco tseg: Anodic oxidation yog tshwj xeeb rau txhuas thiab tsim cov duab zaj duab xis al₂o₃ los ntawm cov ntsiab lus ntawm electrogalvanizing.
IV. Kev Siv Khoom Siv thiab Kev Tswj Xyuas Zoo
1. Daim Ntawv Thov Kev Sau Npe
Cov Ntaub Ntawv Zoo Tshaj: Dav dav tsheb ib puag ncig (cov av noo<85%RH), indoor assembly, and scenarios requiring high appearance and torque precision (e.g., furniture, electronics, automotive interior parts).
Kev txwv: Tsis tsim nyog rau cov tshuaj tsuag roj ntau (cov pa roj plab), muaj zog acid / alkali, lossis ultras-zog galvanizing (kub-dacromet yog nyiam).
2. Kuaj cov qauv
Txheej Thickness: Ntsuas los ntawm x-tshav fluorescence spectroscopy (XRF), ua raws li GB / t {1}}Nws yog xim hlau thiab lwm cov khaub ncaws inorganic - electrogalvanized txheej ntawm steel.
Kua nplaum: Ntsuas ntawm Cass (tooj liab accelerated aceticid ntsev tshuaj tua) raws li ISO 2819; tsis tau tso cai los yog tev ntawm cov txheej tso cai.
Kev tshwm sim: Pom kev kuaj xyuas qis dua 6000K txheem teeb; Cov teeb meem me ntsis xim sib txawv yog tau, tab sis ploj lawm txheej, dub me, lossis dendritic muaju txwv.
3. Kev ceeb toom tsis ua haujlwm
Hydrogen embrittlement txoj kev pheej hmoo: Rau kev ua kom tawv dua 32hrc, 4- teev dehydrogenation kev kho siab ntawm 200 degree los tiv thaiv kev ntxhov siab-inducts bacture.
Kev tshuaj tiv thaiv ib puag ncig: Nyob rau hauv high-vaum sulfur-muaj, zinc-cov kev pom zoo ntawm cov kev pom zoo, muab 3 x tsim kho corrosion.
V. Kev Qhia Txog Cov Ntsiab Lus
Electrogalvanizing yog qhov xav tau kev kho sab saum toj rau ib nrab-rau-qis-kawgFasteners, Cov nyiaj txiag rau ntau dua 70% ntawm kev ua lag luam, vim nws cov haujlwm kub-kub, kwv yees li 1/3 ntawm kub-dip Galvanizing), thiab cov tsos tswj tau. Nws cov ntsiab lus zoo nyob rau hauv txheej txheej sib dhos thiab kev saib xyuas ntawm cov sib txoos precision, ua rau nws haum rau cov xwm txheej corrosion tsis kam thiab kev thov kom zoo nkauj. Los ntawm nruj me ntsis kev ua kom muaj zog, thiab cov txheej txheem ua yeeb yaj kiab uas tau ua tiav, sib ntsib hauv ntiaj teb thiab cov qauv hauv nroog xws li GB / T thiab ISO.
