Kev Taw Qhia rau Dacromet Hexagonal Bolts

2026-09-09 IB

1. Taw qhia

Nyob rau hauv niaj hnub engineering thiab kev tsim khoom, kev ntseeg siab ntawm cov khoom siv sib txuas feem ntau yog nyob ntawm qhov zoo thiab ruaj khov ntawm fasteners. Ntawm cov kev kho deg ntau yam muaj rau steel bolts, Dacromet txheej tau tshwm sim los ua ib qho kev siv thev naus laus zis los muab kev tiv thaiv corrosion tshwj xeeb yam tsis muaj kev cuam tshuam rau lub zog txhua yam. Dacromet hexagonal bolts - hexagon taub hau bolts kho nrog cov txheej txheem zinc-aluminium flake txheej - yog dav teev nyob rau hauv kev lag luam uas qhov kev ua haujlwm ntev nyob rau hauv ib puag ncig hnyav yog qhov tseem ceeb.

Kab lus no muab cov lus qhia dav dav ntawm Dacromet hexagonal bolts, npog qhov xwm txheej ntawm txheej txheej txheej txheem, txheej txheem tsim khoom, qhov zoo ntawm kev ua haujlwm tseem ceeb, kev sib piv nrog cov txheej txheem ib txwm siv, cov ntawv thov raug, thiab cov qauv kev lag luam cuam tshuam. Kev nkag siab txog cov yam no ua rau cov kws tsim khoom, cov neeg yuav khoom, thiab cov kws saib xyuas kev noj qab haus huv los txiav txim siab thaum xaiv cov fasteners rau cov ntawv thov tseem ceeb.

2. Dacromet Txheej yog dab tsi?

Dacromet (ib lub npe lag luam uas tau dhau los ua cov lus piav qhia dav dav rau cov thev naus laus zis) yog cov txheej txheem uas tsis yog electrolytic, inorganic zinc-flake txheej txheej. Nws muaj feem ntau ntawm ultra-fine zinc thiab txhuas flakes dispersed nyob rau hauv ib tug dej-raws li binder uas muaj chromium tebchaw. Tom qab daim ntawv thov thiab kho, cov flakes tsim ib tug multilayered lamellar qauv uas muab ob qho tib si barrier thiab sacrificial (cathodic) tiv thaiv rau lub hauv paus steel substrate.

Tsis zoo li cov pa electroplating los yog kub-dip galvanizing, cov txheej txheem Dacromet tsis koom nrog acid pickling lossis electrolytic deposition. Hloov chaw, feem ntau yog ntxuav txhua yam, muab tso rau hauv lossis txau nrog cov txheej txheem aqueous (feem ntau yog siv txoj kev dip-spin), thiab tom qab ntawd kho ntawm kwv yees li 300 ° C. Thaum lub sij hawm kho, lub binder tsim ib tug ntom inorganic matrix uas kaw cov hlau flakes nyob rau hauv qhov chaw thiab bonds khov kho rau lub hauv paus hlau.

Cov yeeb yaj kiab ua tau zoo kawg nkaus - feem ntau tsuas yog 4-8 μm (micrometers) - tsis tau muab kev tiv thaiv corrosion ob peb zaug ntau dua li cov xim zinc txheej ntawm qhov sib piv lossis ntau dua thickness. Cov tsos mob tiav lawm feem ntau yog ib qho xim hlau nyiaj-grey. Cov kev hloov tshiab niaj hnub, suav nrog chrome-txo thiab chrome-dawb systems (xws li Geomet), hais txog kev hloov pauv ib puag ncig kev cai thaum khaws cov txiaj ntsig kev ua haujlwm tseem ceeb.

3. Hexagonal Bolts thiab lub luag haujlwm ntawm kev kho deg

Hexagonal bolts (tseem hu ua hex taub hau bolts los yog hexagon taub hau screws) feature ib lub taub hau rau sab uas tso cai rau siab torque siv nrog tus qauv wrenches lossis sockets. Lawv yog cov feem ntau fasteners siv nyob rau hauv cov qauv, automotive, machinery, thiab siv kev tsim kho. Cov qib muaj zog los ntawm qis zog (piv txwv li, cov cuab yeej hauv chav kawm 4.8) mus rau lub zog siab (8.8, 10.9, 12.9 thiab tshaj), tsim los ntawm cov hlau los yog hlau alloy thiab kub-kho kom ua tiav cov khoom siv kho tshuab.

Kev kho qhov saum npoo yog qhov tseem ceeb vim tias cov hlau liab qab muaj qhov cuam tshuam rau corrosion, uas tuaj yeem txo cov peev txheej thauj khoom, tuav cov xov, thiab thaum kawg ua rau kev sib koom ua tsis tiav. Cov kev xaiv ib txwm muaj xws li electro-galvanizing thiab kub-dip galvanizing muaj cov kev txwv paub zoo: hydrogen embrittlement txaus ntshai nyob rau hauv high-strength steels, kuj me ntsis corrosion lub neej nyob rau hauv nruj ib puag ncig, thiab seem cuam tshuam los ntawm tuab coatings ntawm zoo threads. Dacromet txheej tau tsim los kov yeej cov kev tsis txaus no.

4. Qhov tseem ceeb ntawm Dacromet Hexagonal Bolts

4.1 Superior Corrosion Resistance

Txawm hais tias txheej txheej tuab ntawm tsuas yog 4-8 μm, Dacromet muab kev tiv thaiv corrosion uas feem ntau 7-10 npaug ntau dua li cov pa electro-galvanizing. Hauv kev kuaj tshuaj ntsev nruab nrab (ASTM B117 / ISO 9227), cov txheej txheem Dacromet tau siv sijhawm ntev dua 1,000 teev - thiab feem ntau ncav cuag 1,200 teev lossis ntau dua - yam tsis muaj qhov tshwm sim ntawm xeb liab. Qee qhov kev ua haujlwm siab ua tiav txawm tias ntev dua. Qhov tshwj xeeb durability no tshwm sim los ntawm ntau txheej txheej thaiv ntawm overlapping zinc thiab txhuas flakes ua ke nrog cov nyhuv passivating ntawm inorganic binder.

4.2 Tsis muaj Hydrogen Embrittlement

Ib qho txiaj ntsig tseem ceeb tshaj plaws rau kev siv lub zog siab yog qhov ua tiav ntawm hydrogen embrittlement kev pheej hmoo. Cov txheej txheem electroplating tsoos suav nrog kev ntxuav cov kua qaub thiab cathodic deposition, ob qho tib si uas tuaj yeem qhia atomic hydrogen rau hauv cov hlau lattice. Qhov hydrogen no tuaj yeem ua rau ncua sij hawm nkig tawg nyob rau hauv tensile stress-tshwj xeeb yog txaus ntshai nyob rau hauv cov chav kawm 10.9, 12.9 thiab siab dua. Vim tias cov txheej txheem Dacromet tsis siv cov kua qaub los yog electrolysis, lub zog muaj zog bolts tuaj yeem coated yam xyuam xim thaum khaws lawv cov khoom siv tag nrho.

4.3 Kev Ua Haujlwm Kub Kub Zoo heev

Dacromet coatings nyob ruaj khov thiab tiv thaiv ntawm qhov kev pabcuam txuas ntxiv mus txog li 300 ° C (thiab raug rau lub sijhawm luv dua). Cov pa zinc electroplatings pib degrade thiab poob corrosion kuj zoo hauv qab 100-150 ° C. Qhov kev ruaj ntseg thermal no ua rau Dacromet hexagonal bolts zoo tagnrho rau lub cav chav tsev, lub tshuab tso pa, cov cua sov, thiab lwm qhov chaw siab-kub.

4.4 Nyias zaj duab xis thiab xov Compatibility

Cov txheej nyias nyias khaws cov xov tseem ceeb ntawm qhov ntev thiab kam rau ua. Tsis zoo li kub-dip galvanizing, uas tso nyiaj 50-80 μm lossis ntau dua thiab feem ntau yuav tsum muaj cov txiv ntseej loj lossis cov xov tom qab txheej txheem, Dacromet-coated bolts tuaj yeem sib xyaw nrog cov txiv ntseej yam tsis muaj kev cuam tshuam. Cov txheej kuj nkag mus rau hauv qhov chaw, cov xov sab hauv, thiab cov geometry nyuaj uas nyuaj rau cov phaj sib npaug los ntawm txoj kev electrolytic.

4.5 Muaj zog Adhesion thiab Recoatability

Txoj kev kho Dacromet zaj duab xis adheres tenaciously rau steel substrate. Nws kuj tseem muab lub hauv paus zoo rau cov organic topcoats los yog xim pleev xim thaum ntxiv xim coding, kev tswj kev sib txhuam, lossis kev xav kom zoo nkauj. Kev tswj-kev sib txhuam topcoats (xws li Dacrolub lossis Plus systems) feem ntau siv los ua kom muaj kev sib raug zoo torque-tensions thaum sib dhos.

4.6 Ib puag ncig thiab txheej txheem txiaj ntsig

Cov dej-raws li chemistry thiab kaw-voj daim ntawv thov txheej txheem ua kom muaj kev phom sij tsawg dua li cov kab plating. Thaum cov txheej txheem Dacromet classic muaj hexavalent chromium, niaj hnub chromium-dawb lossis qis-chromium lwm txoj kev (Geomet thiab zoo sib xws) ua tau raws li cov lus qhia nruj xws li RoHS, ELV, thiab REACH thaum muab kev sib piv.

5. Kev sib piv nrog cov tshuaj pleev ib ce

Cov lus hauv qab no qhia txog qhov sib txawv ntawm qhov ua tau zoo ntawm Dacromet thiab ob qho tib si zinc txheej txheej:

Khoom	Dacromet	Electro-galvanizing	Kub-dip Galvanizing
Txheej Thickness	4-8 m	5-15 hli	50-80 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	Tsawg – nruab nrab
Thaum tshav kub kub Resistance	Txog li 300 ° C	≤100 ° C	≤200 ° C
Xov Fit Impact	Tsawg kawg	Tsawg	Qhov tseem ceeb
Haum rau HS Bolts	Zoo heev	Txwv tsis pub	Nruab nrab

Table 1. Kev sib piv cov ntsiab lus ntawm cov zinc-based coatings rau fasteners.

7. Xaus

Dacromet hexagonal bolts sawv cev rau kev paub tab, kev ua haujlwm siab rau cov ntawv thov uas xav tau kev tiv thaiv corrosion mus ntev, thermal stability, thiab tsis muaj hydrogen embrittlement. Lawv nyias nyias tab sis zoo heev zinc-aluminium flake txheej overcomes ntau ntawm cov kev txwv txuam nrog cov pa electro-galvanizing thiab kub-dip galvanizing, thaum uas tseem tshuav sib xws nrog qhov ntev thiab sib dhos yuav tsum tau ntawm precision fasteners.

Raws li kev lag luam txuas ntxiv mus ntxiv rau kev ua haujlwm ntev dua, txo kev saib xyuas, thiab ua raws li cov kev cai ib puag ncig nruj zuj zus, kev siv cov zinc-flake coatings siab heev-xws li niaj hnub chrome-dawb variants-yuav tsum nthuav dav. Rau cov kws tshaj lij thiab cov kws sau ntawv tshwj xeeb, xaiv Dacromet-coated hexagonal bolts yog lub tswv yim ua pov thawj rau kev txhim kho kev sib koom ua ke hauv corrosive, high-temperature, lossis high-strength ib puag ncig tseem ceeb.

Thaum qhia txog cov fasteners no, yuav tsum tau them nyiaj mloog mus rau qib txheej (txheej hnyav), xaiv topcoats rau kev sib txhuam, cov khoom siv hauv chav kawm ntawv, thiab kev txheeb xyuas kev ua raws li cov txheej txheem thoob ntiaj teb lossis cov neeg siv khoom. Kev xaiv kom raug thiab daim ntawv thov tswj tau zoo kom ntseeg tau tias kev ua tau zoo tag nrho ntawm Dacromet thev naus laus zis tau paub txog hauv kev pabcuam.