Embrittlement ea Hydrogen ke Eng ho Bolts le Screw?

2026-05-28

Selelekela

Hydrogen embrittlement (HE) ke e 'ngoe ea mekhoa e tebileng ka ho fetisisa ea ho hlōleha empa hangata e hlokomolohuoang ka liboutu tse matla, li-screws, linate le li-fasteners tse ling. E baka karohano ea tšohanyetso, e robehileng tlas'a khatello ea maikutlo - leha e le meroalo e ka tlase ho matla a lekantsoeng a fastener. Ho utloisisa HE ho bohlokoa ho lienjineri, lihlopha tse rekang thepa, le batsamaisi ba boleng ba itšetlehileng ka li-fasteners tse kentsoeng lits'ebetsong tse boima.

Hydrogen Embrittlement ke Eng?

Hydrogen embrittlement e etsahala ha athomo ea haedrojene e phunyeletsa lesela la tšepe la bolt kapa screw. Liathomo tsa haedrojene li kenella ka har'a meeli ea lijo-thollo tsa tšepe, li fokotsa ho hlaka le ho thatafala ha fracture. Sephetho: sekoahelo se shebahalang se tiile empa se ka peperana ntle le tlhokomeliso tlas'a mojaro o tsitsitseng.

Lintlha tsa Bohlokoa

E ama liboutu tsa tšepe tse matla haholo (grade 8.8, 10.9, 12.9 le holimo) haholo.
E ka etsahala nakong ea electroplating, pickling, ho hloekisa asiti, kapa ho pepesehela tikoloho e senyang
Hangata e hlaha ka mor'a lihora tse 'maloa ho isa matsatsing ka mor'a kopano - hangata e bitsoa ho robeha ho liehang
HA E tlohele matšoao a bonahalang pele e hloleha ka tšohanyetso

Mehloli e Tloaelehileng ea Hydrogen ka li-Fasteners

Tshebetso	Boemo ba Kotsi	Lintlha
Electroplating (zinki, nickel)	Phahameng	Hydrogen e hlahisoa ka holim'a cathode
Pokello ya asiti / descaling	Phahameng	Ho ba le asiti nako e telele ho khannela H tšepe
Welding haufi le fasteners	Mahareng	Arc welding e ntša hydrogen
Tikoloho ea litšebeletso tse senyang	Mahareng	H2S, mongobo o potlakisa ho monya
Ho roala ha Dacromet / Geomet	Tlase	E itšetlehile ka metsi, ha ho na hydrogen

Tlhokomeliso: Dacromet le theknoloji e ts'oanang ea ho roala metsi e khothaletsoa ka bophara e le mefuta e meng e se nang hydrogen-embrittlement ho fapana le electroplating ea setso bakeng sa liboutu tse matla le liboutu tsa hex.

Ke Li-Fasteners life tse Kotsing Haholo?

Liboutu tsa hex tse matla (M8-M36, kereiti ea 10.9 / 12.9)
Liboutu tsa sebopeho tse sebelisoang ho borokho, mecheng e boima le litora tsa moea
Li-bolts tse nang le li-flange le li-screws tsa hlooho ea sokete ka manonyeletso a bohlokoa a torque
Sekoahelo sefe kapa sefe sa khoele se nang le boima ba 'mele>= 32 HRC

Li-screws le liboutu tse matla a tlase (kereiti ea 4.8 / 6.8) hangata ha li hlaselehe habonolo ka lebaka la ho ductility ho holimo.

Mokhoa oa ho Thibela ho Ebrittlement Hydrogen

1. Khetha Phekolo e Nepahetseng ea Bokaholimo

Qoba electroplating bakeng sa liboutu tse matla haholo. Khetha bakeng sa:

Ho roala ha Dacromet - kotsi ea zero ea hydrogen, khanyetso e ntle ea kutu (480-1000+ lihora tsa letsoai la letsoai)
Ho roala ha Geomet / Luxubao - ho lumellana le RoHS, ha ho na chromium e hexavalent
Hot-dip galvanizing - e loketseng liboutu tsa meralo tse ka tlase ho sehlopha sa 8.8

2. Post-Plating Baking (De-embrittlement)

Haeba electroplating e ke ke ea qojoa, baka li-fasteners ka likhato tse 190-220 bakeng sa lihora tse 8-24 nakong ea lihora tse 4 tsa ho rala ho leleka haedrojene e qabeletsoeng. Sena se hlokahala ho latela maemo a ASTM F1941 le ISO 4042.

3. Hlalosa Melao-motheo

Ha u batla liboutu le li-screw, sheba:

ASTM F606 - tlhahlobo ea mochini ea li-fasteners tse kentsoeng kantle
TS ISO 15330 - Teko ea HE bakeng sa liboutu le likurufu
ASTM B633 / F1941 - litekanyetso tsa ho roala le litlhoko tsa liphallelo tsa HE

4. Laola Tightening Torque

Ho phatloha ho hoholo ho potlakisa ho qalisoa ha crack ho liboutu tse hlaselehang habonolo tsa HE. Sebelisa li-wrenches tsa torque tse lekantsoeng 'me u latele litlhaloso tsa moetsi.

Mokhoa oa ho lemoha ho hloleha ha hydrogen Embrittlement

Fractography: Intergranular fracture pattern under SEM (ha e bapisoa le ductile dimple fracture ka ho hloleha ho tloaelehileng)
Teko e tsitsitseng ea mojaro: Ho latela ISO 15330 - sebelisa 75% mojaro oa bopaki bakeng sa lihora tse 48, hlahloba mapatso.
Slow strain rate test (SSRT): Teko ea Lab ho fumana hore HE susceptibility index

Kakaretso

Ntlha	Lintlha
Li-fasteners tse amehang haholo	Liboutu le li-screw tse matla a holimo (grade 10.9, 12.9)
Lebaka la mantlha	Ho kenngoa ha haerojene nakong ea plating kapa kalafo ea asiti
Mofuta oa ho hloleha	Ho robeha ho liehang ho robeha ka tlas'a moroalo o tsitsitseng
Molemo ka ho fetisisa thibelo	Dacromet / Geomet coating kapa post-plating bake relief
Melao-motheo ea bohlokoa	ISO 15330, ASTM F1941, ASTM F606

Hydrogen embrittlement ke mokhoa o ka thibeloang oa ho hloleha. Ho hlalosa phekolo e nepahetseng ea holim'a metsi - haholo-holo liboutu tse koahetsoeng ka Dacromet le li-screw tse koahetsoeng ke Luxubao - ke mokhoa o bonolo ka ho fetisisa, o theko e boima ka ho fetisisa oa ho felisa kotsi ea HE likopanong tsa bohlokoa.