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Dab tsi yog Hydrogen Embrittlement hauv Bolts thiab Screws?
2026-05-28 IB
Taw qhia
Hydrogen embrittlement (HE) yog ib qho tseem ceeb tshaj plaws tab sis feem ntau saib tsis ua hauj lwm hom nyob rau hauv high-strength bolts, screws, ceev, thiab lwm yam fasteners. Nws ua rau tam sim ntawd, nkig tawg nyob rau hauv tensile kev nyuaj siab - txawm nyob rau hauv loads zoo hauv qab lub fastener lub peev xwm. Kev nkag siab HE yog qhov tseem ceeb rau cov kws tshaj lij, pab pawg muag khoom, thiab cov thawj coj zoo uas vam khom cov hlua khi hauv cov ntawv thov.
Hydrogen Embrittlement yog dab tsi?
Hydrogen embrittlement tshwm sim thaum atomic hydrogen nkag mus rau cov hlau lattice ntawm lub bolt lossis ntsia hlau. Cov hydrogen atoms diffuse mus rau hauv cov hlau cov ciam teb, txo ductility thiab puas toughness. Qhov tshwm sim: lub fastener zoo li qub tab sis tuaj yeem tawg yam tsis muaj kev ceeb toom nyob rau hauv kev txhawb nqa.
Ntsiab Lus Tseeb
- Muaj feem xyuam rau lub zog siab steel bolts (qib 8.8, 10.9, 12.9 thiab siab dua) hnyav tshaj plaws
- Muaj peev xwm tshwm sim thaum electroplating, pickling, acid tu, los yog raug rau ib puag ncig corrosive
- Feem ntau tshwm sim nyob rau hauv cov sij hawm mus rau hnub tom qab sib dhos - feem ntau hu ua ncua kev puas tsuaj
- Tsis txhob tso cov cim ceeb toom pom ua ntej tsis ua hauj lwm tam sim ntawd
Common Sources ntawm Hydrogen hauv Fasteners
| Txheej txheem | Risk Level | Sau ntawv |
| Electroplating (zinc, npib tsib xee) | Siab | Hydrogen generated ntawm cathode nto |
| Acid pickling / descaling | Siab | Lub sijhawm ntev acid raug tsav H rau hauv cov hlau |
| Vuam ze fasteners | Nruab nrab | Arc vuam tso tawm hydrogen |
| Corrosive kev pabcuam ib puag ncig | Nruab nrab | H2S, noo noo nrawm nqus |
| Dacromet / Geomet txheej | Tsawg | Dej-raws li, tsis muaj hydrogen koom nrog |
Lus Cim: Dacromet thiab cov txheej txheem dej zoo sib xws yog dav pom zoo raws li hydrogen-embrittlement-free lwm txoj rau cov tsoos electroplating rau lub zog siab bolts thiab hex bolts.
Cov fasteners twg yog qhov txaus ntshai?
- Lub zog siab hex bolts (M8-M36, qib 10.9 / 12.9)
- Cov qauv siv bolts siv hauv cov txuas hniav, cov tshuab hnyav, thiab cov cua ntsawj ntshab
- Flange bolts thiab lub qhov (socket head cap screws) hauv cov pob qij txha torque-critical
- Txhua threaded fastener nrog hardness> = 32 HRC
Cov ntsia hlau uas muaj zog tsawg thiab bolts (qib 4.8 / 6.8) feem ntau tsis tshua muaj kev cuam tshuam vim lawv cov ductility ntau dua.
Yuav Ua Li Cas Tiv Thaiv Hydrogen Embrittlement
1. Xaiv txoj kev kho saum npoo
Tsis txhob electroplating rau cov bolts muaj zog. Xaiv rau:
- Dacromet txheej - xoom hydrogen txaus ntshai, zoo heev corrosion kuj (480-1000+ teev ntsev tsuag)
- Geomet / Luxubao txheej - RoHS-raws li, tsis muaj hexavalent chromium
- Kub-dip galvanizing - haum rau cov qauv bolts hauv qab qib 8.8
2. Tom qab Plating Baking (De-embrittlement)
Yog tias tsis muaj electroplating, ci fasteners ntawm 190-220 ° C rau 8-24 teev nyob rau hauv 4 teev ntawm plating kom tshem tawm cov khoom siv hydrogen. Qhov no yuav tsum tau ua raws li ASTM F1941 thiab ISO 4042 tus qauv.
3. Qhia cov qauv
Thaum muab bolts thiab screws, siv:
- ASTM F606 - Kev ntsuas txhua yam ntawm cov xov txuas sab nraud
- TS EN ISO 15330 Kev sim rau bolts thiab screws
- ASTM B633 / F1941 - Cov qauv plating nrog HE cov kev xav tau nyem
4. Tswj Tightening Torque
Tshaj-torquing accelerates tawg pib hauv HE-susceptible bolts. Siv calibrated torque wrenches thiab ua raws li cov chaw tsim khoom specifications.
Yuav Ua Li Cas Tshawb Nrhiav Hydrogen Embrittlement Failure
- Fractography: Intergranular fracture qauv nyob rau hauv SEM (vs. ductile dimple puas nyob rau hauv ib txwm tsis ua hauj lwm)
- Kev ntsuas kev thauj mus los: Raws li ISO 15330 - thov 75% pov thawj load rau 48 teev, tshuaj xyuas cov kab nrib pleb
- Slow strain rate test (SSRT): Lab test kom quantify HE susceptibility index
Cov ntsiab lus
| Qhov xwm txheej | Paub meej |
| Feem ntau cuam tshuam fasteners | High-strength bolts & screws (qib 10.9, 12.9) |
| Qhov laj thawj tseem ceeb | Hydrogen absorption thaum plating los yog acid kho |
| Hom kev ua tsis tiav | Ncua brittle tawg nyob rau hauv sustained tensile load |
| Kev tiv thaiv zoo tshaj plaws | Dacromet / Geomet txheej los yog tom qab plating ci nyem |
| Cov qauv tseem ceeb | ISO 15330, ASTM F1941, ASTM F606 |
Hydrogen embrittlement yog hom kev tiv thaiv tsis ua haujlwm. Kev qhia txog kev kho qhov chaw zoo - tshwj xeeb tshaj yog Dacromet-coated bolts thiab Luxubao-coated screws - yog qhov yooj yim tshaj plaws, tus nqi zoo tshaj plaws los tshem tawm HE kev pheej hmoo hauv cov rooj sib tham tseem ceeb.
Yam khoom
- Dacromet Hex Bolts - Qib 8.8 / 10.9, M6-M36
- Geomet Flange Bolts - Raws li RoHS, ntsev-txhaj tshuaj 720h +
- Anti-corrosion Fastener Sets - Kev cai spec muaj
Tshaj tawm los ntawm FUJINRUI Hlau Khoom - Tus kws tshaj lij hauv kev tiv thaiv corrosion fasteners thiab nto-kho bolts rau kev lag luam thoob ntiaj teb.
