GEOMET® (Jumete) Coated Hexagonal Bolts-Technical Introduction 

1. Taw qhia rau GEOMET® (久美特) Txheej

GEOMET® (feem ntau hu ua Suav li 久美特 los yog Jumete) yog ib tug chromium-dawb, dej-raws li zinc-aluminium flake txheej tsim los ntawm NOF Hlau Coatings Group raws li ib tug environmentally friendly successor rau cov tsoos DACROMET® txheej txheem. Nws muab kev tiv thaiv zoo tshaj plaws rau cov hlua khi steel, tshwj xeeb tshaj yog hexagonal bolts, thaum ua raws li cov kev cai niaj hnub ib puag ncig xws li RoHS, REACH, ELV (2000/53 / EC), thiab ISO 10683.

Cov txheej txheej muaj cov zinc passivated thiab aluminium flakes khi los ntawm ib qho inorganic matrix. Siv los ntawm dip-spin los yog tshuaj tsuag txoj kev thiab kho ntawm qhov kub tsis tshua muaj, GEOMET® tsim cov xim hlau nyias-grey zaj duab xis (feem ntau 6-12 μm) uas tsis cuam tshuam rau xov qhov ntev lossis haum. Vim tias cov txheej txheem tsis yog-electrolytic, nws tshem tawm tag nrho cov kev pheej hmoo ntawm hydrogen embrittlement-ib qho txiaj ntsig tseem ceeb rau lub zog muaj zog bolts (cov khoom vaj khoom tsev 8.8, 10.9 thiab 12.9).

1.1 Qhov Zoo Tseem Ceeb ntawm GEOMET®

• Ua tiav chromium-dawb (tsis muaj Cr⁶ lossis Cr³⁺) thiab dej-raws li kev tsim khoom ib puag ncig.
• Cov tshuaj tsw qab zoo heev: 720-1500+ teev (ISO 9227 / ASTM B117) nyob ntawm qib thiab tuab.
• Tsis muaj hydrogen embrittlement - zoo tagnrho rau high-tensile fasteners.
• Nyias zaj duab xis (≈ 8 μm nruab nrab) - tsis cuam tshuam nrog bolt-nut los ua ke lossis torque qhov tseem ceeb.
• Zoo thermal stability mus txog 300 ° C thiab tsis kam mus rau automotive kua, kuab tshuaj thiab cyclic corrosion.
• Hluav taws xob conductivity thiab bimetallic compatibility nrog txhuas.
• Pom zoo los ntawm OEMs loj: Toyota, Honda, VW, BMW, GM, Ford, Daimler, Fiat, thiab lwm yam.

1.2 Main GEOMET® Qib

Table 1 – Sib piv ntawm Common GEOMET® Txheej Systems

Lus Cim: Kev ua tau zoo tiag tiag nyob ntawm qhov hnyav ntawm txheej (feem ntau> 24 g / m²), kev npaj substrate, thiab xaiv PLUS® topcoats uas ntxiv kho kev sib txhuam coefficient (μ ≈ 0.06-0.20 ib ISO 16047).

2. Hexagonal Bolts - Tsim thiab qauv

Hexagonal (hex) lub taub hau bolts yog cov feem ntau siv tshuab fasteners. Lawv lub taub hau rau lub taub hau tso cai yooj yim zawm nrog cov txheej txheem wrenches lossis sockets thiab muab cov kabmob loj. Thaum ua ke nrog GEOMET® txheej, cov bolts no muab ob qho tib si lub zog txhua yam thiab zoo dua rau lub sij hawm ntev corrosion.

2.1 Cov Txheej Txheem Thoob Ntiaj Teb ntsig txog

• ISO 4014 / DIN 931 - Hexagon taub hau bolts nrog ib nrab xov (shank hauv qab taub hau).
• TS EN ISO 4017 / DIN 933 - Hexagon taub hau screws tag nrho threaded.
• TS EN ISO 898-1 Cov khoom siv hluav taws xob ntawm cov fasteners ua los ntawm carbon steel thiab hlau alloy (cov chav kawm 4.6 txog 12.9).
• TS EN ISO 10683 - Cov txheej txheem tsis siv hluav taws xob siv zinc flake txheej ntawm cov fasteners (tseem siv tau rau GEOMET®).
• ASTM F1136 / F1136M - Zinc / Aluminium Corrosion tiv thaiv txheej rau Fasteners.

2.2 Mechanical Property Classes (ISO 898-1)

Table 2 - Cov Khoom Siv Feem Ntau rau Steel Hex Bolts

GEOMET® txheej yog qhov tshwj xeeb tshaj yog muaj txiaj ntsig rau cov chav kawm 10.9 thiab 12.9 vim tias cov txheej txheem tsis siv hluav taws xob tsis txhob siv hydrogen embrittlement uas tuaj yeem tshwm sim nrog cov pa electro-galvanizing.

2.3 Hom Dimensional Ranges

Metric hexagonal bolts feem ntau muab nyob rau hauv txoj kab uas hla ntawm M5 txog M36 (thiab loj dua ntawm kev thov). Xov suab ua raws li ISO metric coarse series. Ib nrab-xov bolts (ISO 4014) tawm ntawm lub shank unthreaded uas txhim kho shear zog; Tag nrho cov xov bolts (ISO 4017) ua kom muaj kev sib koom tes hauv qhov tapping.

3. Cov ntaub ntawv ua tau zoo & txheej txheem txheej txheem

3.1 Corrosion Resistance Data

Table 3 - Cov tshuaj tsw qab ntsev (NSS) Kev Ua Haujlwm (ISO 9227 / ASTM B117)

Cyclic corrosion tests (piv txwv li, GMW 14872, SAE J2334, ACT) kuj qhia tau zoo heev - feem ntau yog 60 lub voj voog lossis ntau dua yam tsis muaj xeb liab thaum siv zoo.

3.2 Cov khoom muaj nuj nqi ntxiv

1. Kev tiv thaiv kub: Kev ua haujlwm khaws cia tom qab 100 h ntawm 180 ° C; siv tau txog ≈ 300 ° C rau lub sijhawm luv.
2. Tshuaj tiv thaiv: Zoo tiv thaiv rau roj, roj, nres kua, coolants thiab ntau organic solvents (VDA 621-412).
3. Mechanical durability: Zoo heev tiv thaiv kev puas tsuaj thiab ntau lub voj voog nruj thaum siv cov coated topcoats.
4. Paintability: Tau tshaj feem ntau cov organic coatings thiab hmoov xim.

3.3 Sib piv nrog lwm cov txheej txheem

Rooj 4 – GEOMET® vs

4. Daim ntawv thov thiab cov txheej txheem kev xaiv

GEOMET®-coated hexagonal bolts yog dav teev nyob rau hauv kev lag luam uas muaj kev tiv thaiv corrosion mus sij hawm ntev, kev ua raws li ib puag ncig thiab txhim khu kev qha txhua yam yuav tsum tau ua ib txhij.

4.1 Cov ntawv thov ib yam

• Automotive: chassis, ncua kev kawm ntawv, powertrain, hauv qab lub cev fasteners (pom zoo los ntawm VW, BMW, GM, Toyota, Honda, thiab lwm yam).
• Kev tsim kho & infrastructure: steel qauv, txuas hniav, tsheb ciav hlau, cua-turbine yees.
• Agricultural thiab siv machinery.
• Hluav taws xob thiab hluav taws xob enclosures qhov twg conductivity thiab corrosion kuj yog ob qho tib si xav tau.
• Cov cuab yeej siv dav dav uas raug rau cov av noo, ntsev los yog cyclic kub.

4.2 Cov lus pom zoo xaiv

Thaum qhia txog GEOMET® hexagonal bolts, xav txog cov hauv qab no:

1. Yuav tsum muaj kev tiv thaiv corrosion → xaiv GEOMET 321 (tus qauv), 500 (kev sib txhuam-tswj) lossis 720 (qhov kev tiv thaiv siab tshaj).
2. Mechanical zog → xaiv cov cuab yeej chav kawm 8.8, 10.9 lossis 12.9 raws li kev thauj khoom thiab kev nyab xeeb.
3. Xov hom → ib nrab xov (ISO 4014) rau shear-critical pob qij txha; Tag nrho xov (ISO 4017) rau kev sib koom siab tshaj plaws.
4. Kev sib txhuam coefficient → qhia PLUS® topcoat yog tias kev sib raug zoo torque-tension tseem ceeb heev.
5. Environmental & regulatory requirements → GEOMET® txaus siab RoHS, REACH thiab ELV yam tsis muaj kev zam ntxiv.

4.3 Daim Ntawv Pov Thawj Zoo

Reputable txheej applicators tuav cov txheej txheem ntawv pov thawj (ISO 9001) thiab feem ntau tuav OEM kev pom zoo (Toyota, GM, thiab lwm yam). Txheej thickness, adhesion (kab xev kuaj), ntsev-spray kev ua tau zoo thiab kev sib txhuam coefficient yuav tsum raug txheeb xyuas raws li ISO 10683 thiab cov neeg siv khoom kos duab. Kev pom kev pom yog ib qho xim hlau nyiaj-grey; dub variants (GEOBLACK®) kuj muaj thaum muaj kev zoo nkauj lossis kev txheeb xyuas qhov xav tau.

5. Cov lus xaus

GEOMET® (久美特) coated hexagonal bolts ua ke cov pov thawj kev ntseeg tau ntawm ISO-txheej txheem hex-head fasteners nrog niaj hnub, chromium-free zinc-aluminium flake txheej uas muab kev tiv thaiv corrosion tshwj xeeb, kev ua raws li ib puag ncig thiab kev ywj pheej los ntawm hydrogen embrittlement. Txawm hais tias siv hauv tsheb chassis, cov qauv steel ua haujlwm lossis cov tshuab ua haujlwm, cov fasteners no muab cov kev daws teeb meem zoo tshaj thiab yav tom ntej rau kev thov.

Rau cov lus pom zoo tshwj xeeb, txheej txheej tshwj xeeb lossis cov ntaub ntawv kho tshuab, sab laj cov txheej txheem ISO (4014, 4017, 898-1, 10683) thiab cov ntaub ntawv kev qhia tawm los ntawm NOF Metal Coatings Group lossis cov neeg thov kev tso cai.