Dacromet Flange Bolts-Technical Txheej txheem cej luam 

1. Taw qhia

Dacromet flange bolts yog lub zog muaj zog fasteners uas ua ke lub taub hau flanged tsim nrog cov txheej txheem zinc-aluminium flake txheej hu ua Dacromet (tseem hu ua zinc-chromium txheej). Kev sib xyaw flange nyob rau hauv lub taub hau faib clamping load ntau tusyees, tsub kom cov kabmob nto, txhim kho kev tiv thaiv kev vibration-induced loosening, thiab nquag tshem tawm qhov xav tau ntawm lub tshuab ntxhua khaub ncaws.

Tsim nyob rau hauv 1970s raws li ib tug high-kev ua tau zoo lwm txoj rau pa electroplating thiab cadmium coatings, Dacromet technology tau dhau los ua ib tug nyiam nto kev kho mob rau Qib 8.8, 10.9 thiab 12.9 bolts. Cov fasteners no feem ntau siv nyob rau hauv tsheb chassis thiab powertrain assemblies, cua-turbine lug, ua liaj ua teb thiab siv machinery, tshuaj ua khoom siv, marine installation thiab sab nraum zoov steel infrastructure qhov twg mus ntev corrosion kuj tseem ceeb heev.

Daim duab A. Cov neeg sawv cev ntawm Dacromet-coated hex flange bolts (hlau xim nyiaj-grey tiav).

2. Dacromet Txheej yog dab tsi?

Dacromet yog non-electrolytic, dej-raws li inorganic txheej uas muaj zinc flakes, aluminium flakes thiab chromium compounds (los yog niaj hnub chromium-free binders) dispersed nyob rau hauv ib tug tshwj xeeb matrix. Cov txheej yog siv los ntawm dip-spin, tshuaj tsuag los yog dip-drain txoj kev thiab tom qab ntawd thermally kho ntawm kwv yees li 300-320 ° C. Thaum kho qhov ntom ntom, ntau txheej txheej lamellar yog tsim uas ib txhij muab kev tiv thaiv kev tiv thaiv thiab kev txi (cathodic) tiv thaiv ntawm cov hlau substrate.

Hom qhuav-film thickness ranges ntawm 5 mus rau 12 μm. Txawm hais tias nws qhov nyias nyias, cov txheej txheem niaj hnub xa tawm ≥1,000 teev (feem ntau 1,200-2,000 teev rau kev ua kom zoo dua qub) ntawm kev tiv thaiv hauv nruab nrab ntsev-txhaj tshuaj ntsuam xyuas (ASTM B117 / ISO 9227) ua ntej cov tsos ntawm cov xeb liab - kwv yees li 7 mus rau 10 npaug ntawm qhov kev ua tau zoo ntawm cov qauv electro-txheej txheem.

3. Qhov zoo tshaj plaws

• Exceptional Corrosion Resistance: ≥1,000-1,500 h ntsev tsuag raug; kev ua tau zoo sib txawv ntau tshaj 2,000 h.
• Zero Hydrogen Embrittlement Risk: Cov txheej txheem siv tsis muaj kua qaub los yog electrolysis, ua rau nws muaj kev nyab xeeb rau cov bolts muaj zog (Qib 10.9+).
• Muaj Peev Xwm Kub Kub: Kev tiv thaiv kev ua tau zoo yog khaws cia txog li 300 ° C.
• Zoo heev Dimensional Control: Nyias uniform zaj duab xis khaws cov xov geometry; tsis xav tau cov txiv ntoo loj.
• Flange Design Benefits: Txawm tias load tis, txo nto siab thiab txhim kho kev co kuj.
• Favorable Environmental Profile: Dej-raws li chemistry nrog kaw-voj daim ntawv thov thiab txo cov dej khib nyiab.

4. Kev sib piv nrog cov tshuaj pleev ib ce

5. Kev tsim khoom & txheej txheej

Cov txheej txheem ib txwm muaj xws li: alkaline tu thiab degreasing; mechanical descaling los yog abrasive blasting (acid pickling yog txhob txwm zam); daim ntawv thov ntawm zinc-flake slurry los ntawm dip-spin los yog tshuaj tsuag; thermal curing ntawm 300-320 ° C; xaiv daim ntawv thov ntawm lubricated los yog tiv thaiv topcoat; thiab qhov kawg txias ntxiv rau kev tshuaj xyuas. Ob daim ntawv thov kev ua tiav ntawm basecoat feem ntau siv kom ncav cuag qhov xav tau tuab thiab qib kev ua haujlwm. Cov kev tswj xyuas tseem ceeb suav nrog kev ua kom huv ntawm qhov chaw, slurry viscosity, spin tsis, lub qhov cub kub sib xws thiab qhov kawg txheej-qhov hnyav.

6. Cov ntawv thov ib txwm

• Automotive & Tsheb thauj mus los: Chassis, ncua kev kawm ntawv, cav thiab nres-system fasteners raug rau txoj kev ntsev, av noo thiab thermal cycling.
• Cua Zog: Ntauwd thiab lub hauv paus bolts rau onshore thiab offshore turbines uas yuav tsum tiv taus ntau xyoo raug rau cov huab cua saline nrog kev saib xyuas tsawg.
• Agricultural & Siv Machinery: Cov cuab yeej ua haujlwm hauv ib puag ncig uas muaj cov dej noo, chiv, av abrasion thiab huab cua sab nraum zoov.
• Tshuaj & Txheej Txheem Kev Lag Luam: Flange kev sib txuas thiab cov txheej txheem fasteners nyob rau hauv cov nroj tsuag tuav corrosive kua los yog cua.
• Infrastructure & Marine: Cov choj, cov kav hlau txuas, cov qauv hauv ntug hiav txwv, cov khoom siv chaw nres nkoj thiab cov chaw tawm ntug dej hiav txwv.

Daim duab 4. Cov txheeb ze kev ua tau zoo ntawm cov yam ntxwv tseem ceeb Dacromet.

7. Cov Qauv, Qib & Kev Qhia Kev Xaiv

Dimensional qauv feem ntau hais txog suav nrog DIN 6921 thiab ISO 4162 (hexagon flange bolts) ua ke nrog cov qauv sib npaug hauv lub tebchaws xws li GB / T 5787. Cov cuab yeej cuab tam feem ntau muab nrog Dacromet txheej yog 8.8, 10.9 thiab 12.9 raws li ISO 898-1. Cov txheej txheem txheej txheem ib txwm teev los ntawm txheej hnyav (Qib A ≈ 24 g / m², Qib B ≈ 36 g / m²) lossis los ntawm tsawg kawg ntawm cov xuab moos ntsev. Ntau lub tsheb OEM thiab cov qauv tshwj xeeb qhia meej meej nyiam zinc-flake systems rau lub zog muaj zog bolts meej vim tias lawv tshem tawm hydrogen-embrittlement txaus ntshai.

Cov tswv yim xaiv tswv yim:

1. Xaiv cov chav kawm txheej txheej raws li qhov xav tau ib puag ncig corrosivity qeb (ISO 9223 C3-C5 lossis siab dua).
2. Rau Qib 10.9 thiab siab dua, qhia Dacromet los yog sib npaug zinc-flake txheej es tsis yog cov pa electroplating.
3. Thaum sib dhos torque qhov tseeb lossis kev ua haujlwm ntau qhov nruj yog qhov tseem ceeb, thov kom muaj kev sib txhuam-tsim topcoat (coefficient ntawm kev sib txhuam 0.10-0.18).
4. Kov thiab txhim kho cov bolts ua tib zoo kom tsis txhob muaj kev puas tsuaj rau cov yeeb yaj kiab uas zoo sib xws.

8. Cov lus xaus

Dacromet flange bolts muaj qhov sib npaug zoo ntawm kev siv lub zog siab, kev tiv thaiv corrosion mus sij hawm ntev, qhov tseeb qhov tseeb thiab kev nyab xeeb ntawm kev ua haujlwm. Los ntawm kev tshem tawm qhov kev pheej hmoo ntawm hydrogen embrittlement thiab xa cov kev pabcuam ntau xyoo txawm tias nyob rau hauv ib puag ncig hnyav, lawv txo cov nqi tu thiab ua kom muaj kev ntseeg tau zoo nyob thoob plaws hauv tsheb, txuas ntxiv-zog, kev lag luam thiab kev tsim kho vaj tse. Cov lus qhia meej meej ntawm cov qib uas xav tau kev siv tshuab, tus qauv qhov ntev, txheej txheej kev ua tau zoo hauv chav kawm thiab cov txheej txheem topcoat kom ntseeg tau tias cov fasteners yuav ua tau raws li qhov xav tau thoob plaws hauv lawv lub neej kev pabcuam.