Dacromet-Coated Bolts le Nuts

2026-10-28

1. Selelekela

Khokahano ea likhoele e matla joalo ka karolo ea eona e fokolang. Bolt ea hex e kentsoeng ka har'a nate e theko e tlaase e entsoeng ka zinki ha se sistimi e sireletsang kutu - ke sele ea galvanic ho lebella ho hloleha. Nate e entsoeng ka zinki e fetoha anode ho banyalani, e senya ka mokhoa o khethehileng, e tšoara likhoele tsa bolt, 'me lenonyeletso lohle le lahleheloa ke boima ba lona nako e telele pele boutu ka boeona e bontša mafome a khubelu.

Ka lebaka lena, litlhaloso tsa setsebi tsa fasteners li lula li tšoara liboutu, linate le li-washer e le sephutheloana se le seng se ts'ireletsoang ho senya. Dacromet (zinki-aluminium flake, non-electrolytic) ke mokhoa oa ho khetha bakeng sa sephutheloana sena: e fana ka khoele e 'ngoe le e' ngoe - e motona le e tšehali - e tšesaane (5-12 μm), seaparo sa filimi, se nang le hydrogen, se mamellang lihora tse 500-1,000 tsa ho pepeseha ha letsoai le sa nke lehlakore (NSS) ntle le ho phatloha ha mafome a masoeu kapa mafome a khubelu.

Sengoliloeng sena se hlalosa malapa a fastening a amehang, mekhoa ea kutu e hlaselang manonyeletso a khoele, hobaneng Dacromet e ts'oara liboutu le linate ka mokhoa o ts'oanang, le mokhoa oa ho hlakisa le ho bokella sete e tšoanang ea bolt-nut-washer.

2. Kamoo Corrosion e Hlaselang Lenonyello le Khole

Li-threads ke li-geometry tse hlaselehang habonolo ka ho fetesisa ho kopano efe kapa efe ea fastener:

1.Crevice corrosion- lekhalo la microscopic pakeng tsa letlapa la bolt le letlapa la linate le tšoasa mongobo le electrolyte, ho theha lekhalo le nang le tlala ea oksijene moo libaka tsa anodic li theha le pitting qala;

2.Kopo ea galvanic- lirafshoa kapa litšepe tse sa tšoaneng (bolt ea Dacromet e nang le linate tse entsoeng ka electro-plated, bolt e sa hloekang ka linate tse nang le galvanized) li khanna ho bola ho khethehileng ha karolo e nyenyane;

3.Tšenyo ea ho roala kopanong- likhoele scrape le nyooko nakong tightening; lipente tse tšesaane tsa electroplate le lipente tsa manyolo li khaola habonolo, li pepesa tšepe e se nang letho metsong ea khoele;

4.Stress concentration- khoele ea pele e jereng mojaro e na le karolo e sa lekanyetsoang ea ho jara pele, ka hona likoting tsa kutu moo li fetoha mapetsong a mokhathala kapele;

5.Ho thothomela ka tlasa vibrate- micro-movement pakeng tsa ho jara lifahleho li senya filimi, e memela mafome a masoeu ebe mafome a khubelu.

Hang ha lihlahisoa tsa mafome li bokellana likhoeleng, linate li tšoaroa, torque ea disassembly e feta torque ea ho kenya, 'me bolt kapa stud hangata e tlameha ho khaoloa - "nate e leqhoa" e hlōlehileng tlhokomelong ea tšimo.

3. Corrosion Resistance of the Matched Set

Sistimi ea ho roala (bolt + nut + washer)	Botenya	NSS ho mafome a mafubelu	Khoele e loketse ka mor'a ho roala	Ho tlosoa ha hydrogen	Litšenyehelo tse amanang
E sa hlakang (t-t-t-tw) /self color, set-tsaw	—	<24 h	E kgabane	Ha ho letho	Tlase ka ho fetisisa
Letlapa la zinki + chromate e putsoa	5 μm	≈ 48 h	E ntle	Phahameng	Tlase
Zinc plate + teteaneng tri-passivate	8–12 μm	120–240 h	E ntle	Phahameng	Tlase-bohareng
Mechanical galvanizing	20-50 μm	300–800 h	E ntle	Tlase haholo	Mahareng
Hot-dip galvanizing (nate e tlatsitsoe hape)	45–85 μm	500–1,500 h	Ho hlokahala hape ho tlanya	Tlase	Mahareng
Dacromet Class 2 (flZn 8)	8mm	≈ 720 h	E kgabane	Ha ho letho	Mahareng
Dacromet Class 3 / e ntšo	10–12 μm	≈ 1,000 h	E kgabane	Ha ho letho	Mahareng-hodimo

Letlapa la 1. Mekhoa ea ho roala bakeng sa likopano tsa bolt-nut ha li bapisoa (litekanyetso tse tloaelehileng tsa indasteri).

Hobane ho roala ho sebelisoa likarolong tse phethiloeng ka mocheso le ho phekoloa ka tlas'a mocheso oa mocheso, liboutu le linate li boloka thepa ea tsona e feletseng ea mochine - matla a tsitsitseng, mojaro oa bopaki le boima ho latela ISO 898-1 / ISO 898-2 - e sa fetohe.

4. Kopano Mekhoa e Molemo ka ho Fetisisa

1.Le ka mohla u se ke ua kopanya mekhoa ea ho roala- kopanya li-bolts tsa Dacromet feela ka linate tsa Dacromet le li-washer; banyalani ba tsoakiloeng ba khanna galvanic corrosion ea karolo e fokolang (hangata e nang le zinc-plated);

2.Hlompha tafole ea torque- li-pair tsa Dacromet tse tlotsitsoeng li na le ntlha e tlase, e tsitsitseng ea linate ho feta tšepe e se nang letho; ho sebelisa hape boleng ba torque ea khale ho tiisa ho feta tekano 'me ho ka hlobola likhoele tsa linate;

3.Se ke oa tlotsa hape- topcoat e kopantsoeng e se e ntse e beha coefficient ea likhohlano; oli e eketsehileng holim'a likhoele e fetola K ka mokhoa o sa lebelloang;

4.Hlokomela taelo ea jeme-nut- ha linate tse tšesaane le linate tse tletseng li kenngoa (tlhophiso ea ho notlela ea khale), tiisa linate tse feletseng khahlanong le linate tse tšesaane;

5.Sheba ho llaka lipara tse sa hloekang - topcoat ea lubricant ea Dacromet e boetse e fokotsa kotsi ea ho tsuba ho li-stainless studs;

6. Netefatsa torque-tension ea sehlooho sa peleka skid ea teko, ho sebelisa motsoako oa sebele oa bolt-nut-washer ho tloha sebakeng sa tlhahiso.

5. Qetello

Ho hloleha ha kutu ha se hangata ho qala ka shank ea bolt - e qala ka likhoele, ka lesoba le pakeng tsa bolt le linate. Ka hona, lenonyeletso le tšoarellang le hloka a e tsamaellanang le sephutheloana sa tšireletso ea kutu: Li-bolts tse koahetsoeng ka Dacromet, linate le li-washers tsamaisong e tšoanang ea zinc-flake, e boletsoeng hammoho (ISO 10683 / ASTM F1136, flZn 8/10, ≥ 720 h NSS), e kopantsoeng ka torque e nepahetseng le litekanyetso tsa likhohlano. Sephetho ke khokahanyo e nang le khoele e hanela mafome a masoeu, mafome a khubelu, pitting, tlhaselo ea mapheo le ho tsieleha - ka lilemo tse ngata tsa ho fafatsa letsoai, boemo ba leholimo le ho thothomela.

E fetileng E latelang.

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