Dacromet Flange Bolts

Xyoo 2026-11-09

1. Taw qhia

Nyob rau hauv niaj hnub kev lag luam daim ntawv thov, lub sij hawm ntev kev ncaj ncees ntawm bolted pob qij txha nyob ntawm hnyav hnyav kev tiv thaiv corrosion thiab anti-xeb kev ua tau zoo. Kev lig kev cai zinc plating thiab kub-dip galvanizing feem ntau poob luv luv nyob rau hauv ib puag ncig hnyav heev xws li ntug hiav txwv infrastructure, offshore platforms, tshuaj nroj tsuag, thiab tsheb underbodies raug rau txoj kev ntsev. Dacromet flange bolts muab cov qauv zoo ntawm flange-head tsim nrog qhov zoo tshaj plaws xeb-tiv thaiv thiab anti-corrosion Cov khoom ntawm zinc-aluminium flake coatings.

Dacromet (tseem hu ua zinc flake txheej) yog ib qho uas tsis yog-electrolytic, dej-raws li kev kho deg. Nws tso ib txheej nyias tab sis muaj txiaj ntsig zoo ntawm zinc thiab txhuas flakes sib txuas los ntawm chromate matrix, xa qhov tshwj xeeb. thaiv kev tiv thaiv, sacrificial cathodic tiv thaiv, thiab kev kho tus kheej passivation. Siv rau flange bolts, txheej txheej no muab kev ntseeg tau ntev xeb kuj yam tsis muaj kev cuam tshuam cov xov haum, qhov tseeb torque, lossis qhia txog kev pheej hmoo ntawm hydrogen embrittlement.

Daim duab 1. High-strength Dacromet-coated bolts nrog uniform silver-grey anti-corrosion tiav

2. Flange Bolts thiab Dacromet Txheej Tshuab

Lub flange ntsia liaj qhov rooj nta ib lub voj voog flange nyob rau hauv lub taub hau hexagonal uas ua haujlwm raws li lub tshuab ntxhua khaub ncaws. Qhov kev tsim no faib cov quab yuam clamping hla lub npoo loj dua, txo qhov kev puas tsuaj ntawm qhov chaw thiab txhim kho kev ua haujlwm ntawm kev vibration-induced loosening. Thaum cov bolts no tau txais Dacromet txheej, kev sib xyaw ua ke ua rau lub nrawm nrawm uas muaj ob qho tib si kev ntseeg siab thiab zoo dua. anti-xeb thiab corrosion-resistant kev ua tau zoo. Cov txheej txheej nyias (feem ntau 5-12 μm) tswj cov xov geometry meej.

2.1 Txheej Txheej thiab Txheej Txheem

Dacromet yog ib qho aqueous dispersion ntawm zinc flakes, aluminium flakes, thiab chromium oxides. Cov txheej txheem tsis-electrolytic feem ntau muaj xws li: (1) kev ntxuav saum npoo yam tsis muaj kev txhoj puab heev acid pickling; (2) daim ntawv thov los ntawm dip-spin, dip-drain los yog tshuaj tsuag; thiab (3) kho ntawm kwv yees li 300 ° C kom fuse cov flakes rau hauv txheej txheej. Lub resulting metallic silver-grey zaj duab xis muab ntau txheej oxidation tsis kam thiab txhim khu kev qha noo noo barrier.

2.2 Mechanisms ntawm Corrosion Protection

Dacromet ua tiav qhov tshwj xeeb anti-corrosion kev ua tau zoo los ntawm peb txoj kev sib koom ua ke:

Kev Tiv Thaiv Barrier: Overlapping zinc thiab txhuas flakes tsim lub labyrinthine lub cev thaiv kev tiv thaiv uas impedes dej, oxygen, thiab corrosive ions xws li chlorides.
Sacrificial (Cathodic) Kev Tiv Thaiv: Zinc flakes nyiam corrode, ua raws li kev txi anode uas tiv thaiv cov hlau substrate los ntawm xeb tsim.
Passivation thiab Kev Kho Tus Kheej: Chromate compounds tsim ib zaj duab xis passive thiab tuaj yeem txav mus rau me ntsis khawb, muab txuas ntxiv tiv thaiv xebthiab muaj peev xwm kho tus kheej.

3. Qhov tseem ceeb ntawm Dacromet Flange Bolts

Piv nrog rau kev kho saum npoo av, Dacromet flange bolts muaj kev sib xyaw ua ke ntawm cov txiaj ntsig kev ua tau zoo:

Superior Salt Spray Resistance: Feem ntau tshaj li 1,000-1,200 teev ntawm nruab nrab ntsev tsuag tshuaj ntsuam (ISO 9227) tsis muaj xeb liab-feem ntau 7-10 npaug zoo dua li cov txheej electro-galvanized.
Zero Hydrogen Embrittlement Risk: Cov txheej txheem tsis-electrolytic tshem tawm hydrogen tiam, ua Dacromet zoo tagnrho rau qib siab-lub zog Qib 8.8, 10.9, thiab 12.9 bolts.
Nyias, Dimensionally Stable Txheej: Thaum tsuas yog 5-12 μm, cov txheej txheem khaws cov xov raug thiab tso cai rau cov txiv ntoo siv yam tsis muaj rov tapping.
Zoo heev Thaum tshav kub kub Resistance: Tuav kev tiv thaiv kev ruaj ntseg mus txog 300 ° C, deb tshaj li cov pa zinc txheej uas degrade saum 100-200 ° C.
Zoo tshaj huab cua thiab tshuaj tiv thaiv: Resistant industrial atmospheres, txoj kev ntsev, me ntsis acids thiab alkalis thaum muab lub sij hawm ntev anti-xebkev ua haujlwm sab nraum zoov.
Tswj kev sib txhuam zoo: Nrog rau kev xaiv lubricated topcoats, lub coefficient ntawm kev sib txhuam tuaj yeem tswj nruj kom txhim khu kev qha clamp load.

4. Kev sib piv nrog cov tshuaj pleev ib ce

Cov lus hauv qab no qhia txog qhov sib txawv tseem ceeb hauv kev tiv thaiv corrosion thiab txheej yam ntxwv.

Khoom	Dacromet	Electro-galvanizing	Kub-dip Galvanizing
Txheej Thickness	5-12 m	5-15 hli	40-80 m
Salt Spray (tsis muaj xeb liab)	≥1,000–1,200 h	100-300 hnub	500-800 h
Hydrogen embrittlement	Tsis muaj	Kev pheej hmoo siab	Kev pheej hmoo nruab nrab
Thaum tshav kub kub Resistance	Txog li 300 ° C	≤100 ° C	≤200 ° C
Xov Fit Impact	Tsawg kawg / zoo heev	Me ntsis	Feem ntau yuav tsum tau rov tapping

Table 1. Kev sib piv ntawm Dacromet piv rau cov pa zinc coatings rau fasteners.

5. Cov ntawv thov ib txwm

Dacromet flange bolts tau teev nyob qhov twg siab corrosion kuj yuav tsum tau ua ke nrog txhua yam kev ntseeg tau:

Automotive: Chassis, ncua kev kawm ntawv, nres tshuab thiab cov khoom hauv qab lub cev raug rau txoj kev ntsev.
Cua zog & offshore: Ntauwd flanges, kev sib dhos nacelle thiab cov qauv kev sib txuas hauv cov huab cua saline.
Kev tsim kho & infrastructure: Cov choj, cov tsev nyob ntug dej hiav txwv, cov guardrails yuav tsum tau mus ntev tiv thaiv xeb.
Heavy Machinery & Rail: Cov khoom siv nyob rau hauv qhov chaw ntub dej lossis tshuaj lom neeg nruj heev nyob qhov twg anti-corrosionkev ua tau zoo yog qhov tseem ceeb.

6. Cov Lus Qhia Tshwj Xeeb

Dacromet flange bolts yog tsim los rau cov qauv loj thoob ntiaj teb thiab qib zog:

Parameter	Hom Ntau Yam / Tus Nqi
Cov qauv	DIN 6921, ISO 4162, GB / T 5787 / 5789, ASME B18.2.1
Qib zog	8.8, 10.9, 12.9 (metric); SAE Qib 5 / 8 (nti)
Xov Diameter	M5-M24 (Metric); 1/4 "- 5/8" (Imperial)
Ntev Ntau	10mm - 200mm (kev cai ntev muaj)
Txheej Thickness	Feem ntau 5-12 μm (Qib A / B variants)
Qhov tshwm sim	Metallic silver-grey (matte)

7. Kev teeb tsa kev coj ua zoo tshaj plaws & Cov lus xaus

Yuav kom maximize anti-corrosion Kev pabcuam lub neej ntawm Dacromet flange bolts: siv Dacromet-coated txiv ntseej thiab cov ntxhua khaub ncaws uas ua tau; ua raws li kev pom zoo torque qhov tseem ceeb (tswj kev sib txhuam txhawb nqa qhov tseeb clamp); zam kev puas tsuaj ntau dhau thaum tuav; thiab khaws cov fasteners nyob rau hauv qhuav tej yam kev mob ua ntej siv.

Hauv cov ntsiab lus, Dacromet flange bolts sawv cev rau kev paub tab, kev ua haujlwm siab nrawm uas ua tiav qhov kev xav tau ntawm ob qho kev ntseeg siab thiab lub sijhawm ntev. kev tiv thaiv corrosion. Los ntawm kev sib koom ua ke ntawm cov khoom sib faib cov txiaj ntsig ntawm kev tsim cov flange nrog nyias, zoo heev zinc-aluminium flake txheej, cov fasteners no xa cov khoom zoo heev. anti-xeb kev ua tau zoo, tshem tawm hydrogen embrittlement txaus ntshai, thiab tswj xyuas qhov ntsuas qhov tseeb.

Nyob rau hauv ib puag ncig uas cov pa electro-galvanized los yog kub-dip galvanized fasteners yuav raug kev txom nyem ntxov ntxov xeb thiab degradation - ntug hiav txwv dej, marine, tsheb, thiab chaw lag luam - Dacromet flange bolts muab pov thawj, ruaj lwm txoj kev. Lawv zoo heev weatherability, oxidation tsis kam, thiab kev tiv thaiv kev txi cov tshuab ua kom lub neej ntev kev pab cuam thiab txo tus nqi kho, ua rau lawv muaj kev xaiv ntau dua rau cov engineers thiab cov neeg tsim qauv thoob ntiaj teb.