Dacromet Flange Bolts: Kev Taw Qhia Txog Kev Ua Haujlwm Siab Corrosion-Resistant Fasteners

2026-09-14 IB

1. Taw qhia

Hauv kev tsim vaj tsev niaj hnub thiab kev tsim khoom, kev ntseeg siab ntawm cov pob qij txha yog qhov tseem ceeb rau kev ncaj ncees, kev nyab xeeb, thiab kev ua haujlwm ntev. Cov tsoos fasteners feem ntau raug kev txom nyem los ntawm corrosion, tshwj xeeb tshaj yog nyob rau hauv ib puag ncig hnyav uas muaj xws li ya raws, ntsev, tshuaj, los yog siab kub. Dacromet flange bolts daws cov teeb meem no los ntawm kev sib txuas tshwj xeeb zinc-aluminium flake txheej nrog cov khoom siv zoo ntawm flange taub hau tsim.

Dacromet flange ntsia liaj qhov rooj yog ib qho kev ua tau zoo fastener uas ua ke nrog lub tshuab ntxhua khaub ncaws zoo li flange hauv qab lub taub hau nrog cov txheej tsis-electrolytic zinc-flake txheej hu ua Dacromet (los yog zinc flake txheej txheej tau los ntawm nws). Qhov kev sib xyaw ua ke no muab tshwj xeeb rau kev tiv thaiv corrosion, zoo ib yam clamping quab yuam, thiab kev ywj pheej los ntawm hydrogen embrittlement - ua rau nws tshwj xeeb tshaj yog haum rau kev siv lub zog siab hauv tsheb, kev tsim kho, marine, lub zog, thiab kev lag luam.

2. Dacromet Txheej yog dab tsi?

Dacromet yog dej-raws li, inorganic zinc-aluminium flake txheej txheej txheem pib tsim hauv xyoo 1970. Nws muaj zinc thiab txhuas flakes raug tshem tawm hauv chromate (lossis chromium-free) binder. Cov txheej txheej yog siv los ntawm dip-spin, tshuaj tsuag, lossis immersion txoj kev thiab tom qab ntawd kho ntawm qhov kub siab (feem ntau nyob ib ncig ntawm 300 ° C), ua rau nyias, ntom, ntau txheej tiv thaiv zaj duab xis.

Cov yam ntxwv tseem ceeb ntawm txheej txheej muaj xws li:

Nyias zaj duab xis thickness: Feem ntau 4-12 μm (feem ntau 6-8 μm), uas tswj xyuas cov xov zoo.

Barrier + sacrificial tiv thaiv: Overlapping hlau flakes tsim ib qho kev thaiv lub cev thaum zinc muab kev tiv thaiv galvanic (sacrificial).

Tsis muaj hydrogen embrittlement: Cov txheej txheem tsis-electrolytic zam cov kua qaub pickling thiab electrolysis, tshem tawm cov kev pheej hmoo ntawm hydrogen-induced ncua kev puas tsuaj hauv cov hlau muaj zog.

Thaum tshav kub kub kuj: Ruaj khov txog li ntawm 300 ° C tas mus li kev pabcuam kub.

Qhov tsos: Metallic silver-grey matte tiav.

Nco ntsoov tias "Dacromet" yog lub npe lag luam lag luam; zoo li zinc-flake systems (xws li Geomet, uas tsis muaj chromium) tau dav siv niaj hnub no kom tau raws li cov kev cai niaj hnub no (RoHS, REACH, ELV).

3. Dab tsi yog Flange Bolts?

Lub flange ntsia liaj qhov rooj (tseem hu ua flanged hex taub hau ntsia liaj qhov rooj los yog ncej ntsia liaj qhov rooj) nta ib tug ib ncig flange nyob rau hauv lub hexagonal taub hau uas ua hauj lwm raws li ib tug built-in washer. Qhov kev tsim no faib cov clamping load rau ntawm thaj chaw loj dua, txo qhov kev pheej hmoo ntawm embedding rau hauv cov khoom sib koom, txhim kho kev tiv thaiv kev vibration loosening, thiab feem ntau tshem tawm qhov xav tau ntawm lub tshuab ntxhua khaub ncaws.

Cov hom muaj xws li:

Hex flange bolts (feem ntau)

Serrated flange bolts (nrog rau hauv qab lub taub hau serrations los tiv thaiv kev sib hloov)

Lub taub hau taub hau lossis lwm yam tshwj xeeb flange variants

Thaum ua ke nrog Dacromet txheej, cov bolts muaj ob qho tib si kev ua haujlwm zoo tshaj plaws thiab kev ua haujlwm zoo ib puag ncig.

4. Kev sib piv nrog Cov Txheej Txheem Txheej Txheem

Cov lus hauv qab no qhia txog qhov sib txawv ntawm kev ua tau zoo:

Khoom	Dacromet	Electro-Zinc	Kub-Dip Galv.	Stainless
Salt Spray (hli)	1,000 – 1,500+	100-300	500-1,000+	Inherent
Txheej Thickness	4-12 m	5-15 hli	40-100 + m	N/A
H Embrittlement Risk	Tsis muaj	Siab (rau ≥10.9)	Tsawg-Medium	Tsis muaj
Max Service Temp.	~ 300 ° C	100-120 ° C	~ 200 ° C	Siab
Xov Fit Impact	Tsawg kawg	Tsawg	Qhov tseem ceeb	Tsis muaj

Nco tseg: Kev ua tau zoo tiag tiag sib txawv nrog qib txheej, thickness, topcoat, thiab ib puag ncig. Chromium-free zinc-flake systems (piv txwv li, Geomet) muaj kev tiv thaiv corrosion zoo sib xws thaum ua tau raws li cov qauv nruj dua.

5. Tej thaj chaw thov loj

Dacromet flange bolts yog dav siv nyob rau hauv chassis Cheebtsam, ncua kev kawm ntawv systems, engine mounts, nres los ua ke, tso systems, thiab lub cev qauv. Lawv tiv taus txoj kev ntsev, thermal cycling, kev vibration, thiab kub hauv qab hood thaum muab kev ruaj ntseg clamp load.

Hauv cov choj, cov kav hlau txuas, cov qauv hlau, thiab cov chaw nyob hauv ntug dej hiav txwv, cov bolts no muaj kev tiv thaiv mus ntev tiv thaiv huab cua corrosion thiab txo kev tu ntau zaus.

Offshore cua turbine foundations, hnub ci mounting systems, shipbuilding, thiab cov khoom siv chaw nres nkoj tau txais txiaj ntsig los ntawm cov ntsev-txhaj tshuaj tiv thaiv siab thiab muaj peev xwm ua rau cov txheej txheem geometries sib npaug.

Cov cuab yeej siv tau rau cov chiv, tshuaj, dej noo, thiab kev puas tsuaj - xws li cov tshuab ua liaj ua teb, twj, li qub, thiab cov txheej txheem txheej txheem - feem ntau qhia txog Dacromet-coated flange fasteners rau kev pab lub neej ntev.

6. Cov Qib, Cov Qauv, thiab Kev Taw Qhia Kev Xaiv

Cov chav kawm khoom vaj khoom tsev: Dacromet flange bolts muaj nyob rau hauv cov cuab yeej chav kawm 4.8, 8.8, 10.9, thiab 12.9 (metric), nrog rau Qib 5 thiab Qib 8 (imperial). Cov qib siab zog (10.9/12.9) tshwj xeeb tshaj yog tau txais txiaj ntsig los ntawm qhov tsis muaj hydrogen embrittlement txaus ntshai.

Dimensional qauv: Cov ntaub ntawv muaj xws li ISO metric flange bolt qauv, DIN, GB (Suav), thiab ASME / ANSI rau nti series.

Txheej specifications: Kev ua tau zoo feem ntau teev los ntawm qhov hnyav ntawm txheej txheej tsawg kawg nkaus (piv txwv li, Qib A ≈ 24 g / m², Qib B ≈ 36 g / m²) thiab cov kev cai ntsev-txhaj tshuaj. Topcoats tuaj yeem muab ntxiv rau kev txhim kho lubricity, xim, lossis ntxiv kev tiv thaiv.

Cov lus qhia xaiv: Sib piv cov txheej txheem txheej rau cov kab xeb ntawm ib puag ncig (xws li, C3-C5 rau ISO 12944). Rau cov txheej txheem muaj zog sib koom ua ke, paub meej tias cov ntaub ntawv torque-nruj nrog cov txheej txheej tshwj xeeb thiab topcoat. Xaiv cov tshuab tsis muaj chromium thaum yuav tsum ua raws li ib puag ncig.

7. Kev teeb tsa thiab kev txiav txim siab

Kov nrog tu: Txawm hais tias txheej txheej muaj adhesion zoo, zam kev puas tsuaj loj thaum tuav thiab teeb tsa.

Torque tswj: Siv cov kev sib txhuam coefficient uas muab los ntawm cov khoom siv txheej txheej. Lubricated Dacromet tshuab tsim ntau qhov sib npaug clamp loads dua li cov zinc coatings unlubricated.

Compatibility: Dacromet feem ntau yog sib xws nrog feem ntau gasket thiab sealing cov ntaub ntawv thiab tuaj yeem pleev xim tshaj yog tias xav tau.

Kev tshuaj xyuas: Kev soj ntsuam pom rau txheej txuas ntxiv thiab kev kuaj adhesion (qhov twg tau teev tseg) yuav tsum yog ib feem ntawm kev tswj kom zoo.

8. Xaus

Dacromet flange bolts sawv cev rau kev paub tab, kev ua haujlwm siab nrawm uas ua tiav qhov sib npaug zoo tiv thaiv corrosion, kev ntseeg tau ntawm txhua yam, thiab qhov tseeb ntawm qhov ntev. Los ntawm kev tshem tawm hydrogen embrittlement txaus ntshai thaum xa cov ntsev-txhaj tshuaj ua tau zoo dua li cov pa zinc plating, lawv tau dhau los ua qhov kev xaiv zoo tshaj plaws rau kev thov siv thoob plaws hauv tsheb, lub zog, kev tsim kho, thiab kev lag luam.

Raws li kev cai ib puag ncig txuas ntxiv tsav kev saws me nyuam ntawm chromium-dawb zinc-flake systems, thev naus laus zis txuas ntxiv mus ntxiv thaum khaws nws cov txiaj ntsig tseem ceeb. Thaum qhia cov fasteners rau corrosive los yog kub-kub ib puag ncig-tshwj xeeb yog qhov yuav tsum tau high-strength qib-Dacromet (los yog sib npaug zinc-flake) coated flange bolts yuav tsum tau xav hais tias yog ib tug pov thawj thiab nqi-zoo tshuaj nyob rau hauv kev pab cuam lub neej ntawm lub rooj sib txoos.

Cov kws tsim khoom thiab cov neeg yuav khoom raug txhawb kom sab laj nrog cov neeg siv khoom txheej txheej rau cov ntaub ntawv qhia ntxaws ntxaws, kev sib txhuam coefficients, thiab cov ntawv ntsuas ntsev-txheej txheem tshwj xeeb rau cov txheej txheem xaiv thiab cov ntawv thov.

Tsis Muaj. Tom ntej no.

Xov xwm tshiab