Kedu ihe bụ Hydrogen Embrittlement na Bolts na Skru?

2026-05-28

Okwu mmalite

Hydrogen embrittlement (HE) bụ otu n'ime ụdị ọdịda kachasị njọ ma a na-elegharakarị anya na bolts ike dị elu, skru, mkpụrụ, na ihe ndị ọzọ. Ọ na-ebute mgbaji na mberede na mgbawa n'okpuru nrụgide tensile - ọbụlagodi na ibu dị n'okpuru ikike nke ngwa ngwa. Ịghọta HE dị oke mkpa maka ndị injinia, otu ndị na-azụ ahịa, na ndị njikwa mma na-adabere na eriri eriri na-achọ ngwa.

Kedu ihe bụ Embrittlement Hydrogen?

Ọkpụkpụ hydrogen na-eme mgbe hydrogen atomịk na-abanye n'ime lattice metal nke bolt ma ọ bụ ịghasa. Atọm hydrogen na-agbasa n'ime oke ọka igwe, na-ebelata ductility na ike mgbaji. Ihe si na ya pụta: ihe nkedo nke na-adị ka ihe adịghị mma mana ọ nwere ike ịgbawa n'enweghị ịdọ aka ná ntị n'okpuru ibu na-adịgide adịgide.

Isi Eziokwu

Na-emetụta bolts ígwè dị elu (ọkwa 8.8, 10.9, 12.9 na karịa) nke ukwuu.
Enwere ike ime n'oge electroplating, pickling, acid ihicha, ma ọ bụ ikpughe na gburugburu ebe mebiri emebi
A na-egosipụtakarị n'ime awa ruo ụbọchị ole na ole mgbe mgbakọ gasịrị - a na-akpọkarị mgbaji na-egbu oge
A naghị ahapụ akara ịdọ aka ná ntị a na-ahụ anya tupu ọdịda mberede

Isi mmalite nke hydrogen na fasteners

Usoro	Ọkwa ihe egwu	Ihe ndetu
Electrolating (zinc, nickel)	Elu	A na-emepụta hydrogen na elu cathode
Acid pickling / descaling	Elu	Ikpughe acid ogologo oge na-ebuba H n'ime ígwè
Welding nso fasteners	Ọkara	Arc ịgbado ọkụ na-ahapụ hydrogen
gburugburu ọrụ rụrụ arụ	Ọkara	H2S, iru mmiri na-eme ngwa ngwa
Dacromet / Geomet mkpuchi	Dị ala	Mmiri dabere na mmiri, enweghị itinye aka na hydrogen

Mara: A na-atụ aro Dacromet na teknụzụ mkpuchi mmiri ndị yiri ya dị ka ihe ndị ọzọ na-enweghị hydrogen-embrittlement maka elektrọnik ọdịnala maka bolts dị elu na hex bolts.

Kedu ihe nkedo kacha nọrọ n'ihe ize ndụ?

bolts hex siri ike dị elu (M8-M36, ọkwa 10.9 / 12.9)
Ihe mgbochi ihe eji arụ ọrụ na àkwà mmiri, igwe dị arọ, na ụlọ elu ikuku
Mkpọchi flange na sọket isi okpu kposara n'ime ihe nkwonkwo dị oke mkpa
Ihe nkwụnye eriri ọ bụla nwere ike> = 32 HRC

skru na bolts dị ala (ọkwa 4.8 / 6.8) anaghị adịkarị mfe n'ihi ductility ha dị elu.

Otu esi egbochi ikuku hydrogen

1. Họrọ ọgwụgwọ elu nke ọma

Zere electroplating maka elu-ike bolts. Họrọ maka:

Ihe mkpuchi dacromet - ihe ize ndụ hydrogen efu, ezigbo nguzogide corrosion (nnu nnu 480-1000 + awa)
Ihe mkpuchi Geomet / Luxubao - RoHS kwadoro, enweghị chromium hexavalent
Hot-mikpu galvanizing - adabara bolts ihe owuwu n'okpuru ọkwa 8.8

2. Nri na-emecha efere (De-embrittlement)

Ọ bụrụ na enweghị ike ịpụpụ electroplating, mee ihe nkedo na 190-220 degrees C maka awa 8-24 n'ime awa 4 nke plating iji chụpụ hydrogen tọrọ atọ. Nke a chọrọ maka ụkpụrụ ASTM F1941 na ISO 4042.

3. Ezipụta ụkpụrụ

Mgbe ị na-enweta bolts na skru, rụtụ aka:

ASTM F606 - Nnwale igwe nke eriri eriri mpụga
TS EN ISO 15330 - Ọ na-anwale bolts na kposara
ASTM B633 / F1941 - ụkpụrụ ịkwado ihe enyemaka HE

4. Control Tightening Torque

Ịfefe oke na-eme ka mmalite mgbape dị na bolts nwere ike ịnweta HE. Jiri wrenches torque emebere ma soro nkọwapụta ndị nrụpụta.

Otu esi achọpụta ọdịda ikuku hydrogen

Fractography: Ụkpụrụ mgbawa intergranular n'okpuru SEM (vs. ductile dimple fracture na nkịtị ọdịda)
Nnwale ibu na-adịgide adịgide: kwa ISO 15330 - tinye ihe akaebe 75% maka awa 48, lelee mgbawa.
Nnwale ọnụego nwayọ nwayọ (SSRT): Nnwale ụlọ nyocha iji wepụta ndeksi nhụsianya HE

Nchịkọta

Ihe kpatara ya	Nkọwa
Ihe nkedo kacha emetụta	Ihe mkpuchi na kposara ike dị elu (ọkwa 10.9, 12.9)
Ihe kpatara ya	Ntinye hydrogen n'oge plating ma ọ bụ ọgwụgwọ acid
Ụdị ọdịda	Ọkpụkpọ mgbaji na-egbu oge n'okpuru ibu ntanye na-adịgide adịgide
Mgbochi kacha mma	Mkpuchi Dacromet / Geomet ma ọ bụ enyemaka ime achịcha post-plating
Ụkpụrụ isi	ISO 15330, ASTM F1941, ASTM F606

Mgbasa hydrogen bụ ụdị ọdịda a na-egbochi ya. Ịkọwa ọgwụgwọ dị mma n'elu - karịsịa mkpuchi mkpuchi Dacromet na mkpuchi Luxubao - bụ ụzọ kachasị mfe, nke kachasị ọnụ ahịa iji kpochapụ ihe ize ndụ HE na mgbakọ dị oke mkpa.