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Dacromet-Coated Hex Bolts
2026-10-27
1. Selelekela
Lenonyeletso le leng le le leng la bolted ke ntoa khahlanong le kutu. Hex bolt (hexagon head cap screw) e ka 'na ea e-ba eona sekoahelo se atileng ka ho fetisisa lefatšeng, empa hang ha se kentsoe borokhong, tora ea phetiso, kapa semela sa lik'hemik'hale, hang-hang se hlaseloa ke mongobo, oksijene, li-ion tsa chloride le sulfur dioxide. Rust - pele mafome a masoeu (lihlahisoa tsa zinc oxidation), joale mafome a makgubedu (iron oxide) - e phunyeletsa holim'a libaka tse jereng, e kene ka har'a likhoele, 'me e qetelle e tšoara nate, e fokolisa boima ba clamp,' me e senya lenonyeletso.
Ho roala ha Dacromet (hape ho bitsoa DACROMET, coating ea zinc-flake, kapa non-electrolytic zinc-aluminium flake coating) e entsoe ka nepo ho hlola ntoa ena. E fana ka liboutu tsa hex, li-studs, le linate tse ts'oanang tsa hex le li-washer lihlomo tse tšesaane, tse ts'oanang, tse se nang haedrojene tse pholohang lihora tse fetang 700 tsa liteko tse sa nke lehlakore tsa letsoai (NSS) - makhetlo a 'maloa khanyetso ea kutu ea electro-galvanizing ka botenya bo tšoanang.
2. Fastener Basics: The Hex Bolt ka Kopanelo e Bolted
Hex bolt e sebetsa ka nate (kapa lesoba le tekiloeng) ho kopanya likarolo tse peli kapa ho feta hammoho. Botšepehi ba lenonyello bo itšetlehile ka lata pele (clamp load) e hlahisoang nakong ea ho tiisa, e laoloang ke ho sebelisoa torque, sekontiri sa khoele, le khohlano coefficient (μ) pakeng tsa libaka tse jereng le likhoele. Kopanong e laoloang ke torque, baenjiniere ba fetolela sepheo sa pele ho boleng ba torque ba sebelisa nut factor (K ≈ 0.12–0.16 bakeng sa li-fasteners tse tlotsitsoeng tsa zinki-flake).
Likarolo tse tloaelehileng tsa ho nyalana ka har'a kopano ea liboutu li kenyelletsa:
- Hex bolts / hex caps screws- khoele e feletseng (DIN 933 / ISO 4017) kapa khoele e sa fellang (DIN 931 / ISO 4014), sehlopha sa thepa 8.8, 10.9, kapa 12.9;
- Hex linate- ISO 4032 linate tse tloaelehileng kapa ISO 4033 linate tse tšesaane / jeme, sehlopha se bapisitsoeng le bolt;
- Li-washer tse bataletseng(DIN 125) le lihlahisoa tsa selemo (DIN 127) - aba meroalo e belehang le ho eketsa khanyetso ea vibrate;
- Li-studs le likhoele tse khoele- bakeng sa likhokahano tsa flanged le likopano tse koetsoeng ka bolt;
- Linate tsa flange le liboutu tsa flange- e nang le li-flange tse nang le likarolo tse ngata bakeng sa li-substrates tse bonolo.
E 'ngoe le e' ngoe ea likarolo tsena e tlameha ho arolelana mokhoa o ts'oanang oa ts'ireletso ea kutu; bolt ea Dacromet e kopantsoeng le nate e hlakileng ea zinki e theha banyalani ba galvanic e hlabelang nate pele.
3. Corrosion Resistance: Dacromet vs. Other Bolt Finishes
Mamello ea ho fafatsa letsoai (ISO 9227 / ASTM B117, lihora ho isa ho mafome a khubelu) ke letšoao la indasteri bakeng sa ts'ireletso ea "fasteners corrosion".
| Qetella / sisteme ea ho roala | Botenya | Lihora ho isa ho rust e khubelu (NSS) | Rust e tšoeu (NSS) | Ho tlosoa ha hydrogen | Lintlha |
| E se nang letho (e mebala, e tlotsitsoeng ka oli) | — | <24 h | — | Ha ho letho | Tšebeliso ea ka hare feela |
| Ho roala zinki, chromate e putsoa (Zn3) | 5 μm | ≈ 48 h | 12–24 h | Phahameng | Theko e tlase, thepa ea bareki |
| Ho roala zinki, passivate e teteaneng (Zn12) | 12 μm | ≈ 192 h | 96–168 h | Phahameng | Eseng bakeng sa sehlopha ≥ 10.9 |
| Mechanical galvanizing | 20-50 μm | 300–800 h | 200–400 h | Tlase haholo | E ntle bakeng sa likarolo tse kholo |
| Hot-dip galvanizing (HDG) | 45–85 μm | 500–1,500 h | 200–500 h | Tlase | Likhoele li hloka ho tlatsoa hape |
| Sehlopha sa 2 sa Dacromet | 8mm | ≈ 720 h | 300-500 h | Ha ho letho | Joalo ka khoele e nepahetseng |
| Dacromet Class 3 / e ntšo | 10–12 μm | ≈ 1,000 h | 500–720 h | Ha ho letho | Palo ea likoloi tsa OEM |
Dacromet e boetse e feta ho roala zinki ka har'a Kesternich teko (SO₂ corrosion, ISO 6988 - sepakapaka sa indasteri le pula ea asiti), ho tlhahlobo ea cyclic corrosion (CCT: setlolo se kopantsoeng sa letsoai / mongobo / ho omisa), ho ho lumellana le galvanic ka aluminium substrates (ka lebaka la aluminium flake content), ho mocheso baesekele (filimi ea inorganic e mamella ts'ebeletso ea 120-300 ° C, moo liphahlo tsa manyolo), le khanyetso ea lik'hemik'hale ho matsoai a litsela le lik'hemik'hale tse tlosang leqhoa.
4. Qetello
Bakeng sa liboutu tsa hex le lisebelisoa tsa tsona tsa ho kopanya, ho roala ha Dacromet ho fana ka tekanyo e ntle ka ho fetisisa ea ts'ireletso ea kutu, ho nepahala ha mochini, le ts'epo ea kopano e fumanehang kajeno: mamello ea ho fafatsa letsoai ho fihlela lihora tse 1,000, ho itšireletsa ha hydrogen embrittlement, geometry ea khoele e bolokiloeng, le likhohlano tse tsitsitseng bakeng sa kopano e laoloang ke torque. Kae kapa kae moo lenonyeletso le nang le liboutu le tlamehang ho pholoha pula, letsoai le nako, lintlha tse lokelang ho hopoloa ke: matla a phahameng a hex bolt, zinc-flake (Dacromet) e koahetsoeng, ISO 10683 / ASTM F1136 e lumellana.
