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DACROMET HEX NUTS-Sumo Yakazara kune Corrosion-Resistant Fasteners
2026-08-25
1. Nhanganyaya
Hexagonal nzungu, dzinowanzozivikanwa sehex nuts, dziri pakati pezvinonyanya kushandiswa zvekusungirira mukugadzira mainjiniya, kuvaka, mota, uye kushandiswa kwemaindasitiri. Kana yakasanganiswa nepamusoro pekurapa kwepamusoro senge Dacromet coating, izvi zvikamu zvinowana yakasarudzika corrosion resistance, zvichiita kuti zvikwanise nharaunda dzakaomarara dzinosanganisira dzemugungwa, mota dzepasi pevhu, uye zvekunze zvimiro zvekushandisa.
Ichi chinyorwa chinopa sumo yemaonero maviri: kutanga kuongorora dhizaini yakakosha uye zviyero zvehekisi nzungu, uye chechipiri kuongorora iyo Dacromet (zinc-aluminium flake) yekupfekedza tekinoroji iyo inosimbisa zvakanyanya kusimba kwavo nekuita.
1.1 Chii Chinonzi Hex Nuts?
Hex nut imhando yefastener ine buri rine shinda uye chekunze chechimiro chine hexagonal. Iyo nhanhatu-mativi geometry inobvumira kushanda kwakanaka kwe torque uchishandisa yakajairwa wrenches kana zvigadziko, ichipa mukana wakanaka munzvimbo dzakavharirwa uchipokana kutenderera pasi pemitoro yakakwira. Hex nzungu dzinowanzo shandiswa pamwe chete nebhaudhi yekubatanidza kana stud kusungirira zvinhu zviviri kana kupfuura pamwechete.
Hunhu hwakakosha hunosanganisira:
- Tambo yemukati (metric kana imperial) inoenderana nebhaudhi
- Upamhi kuyambuka mafurati (wrench saizi) uye ukobvu kunotsanangurwa nezviyero
- Inowanikwa mumagiredhi esimba akasiyana (semuenzaniso, Kirasi 8, 10, Giredhi 5, 8)
- Zvakajairika zvinhu: kabhoni simbi, alloy simbi, Stainless simbi
1.2 Basa reDacromet Coating
Dacromet ndeye proprietary zinc-aluminium flake coating system (yakatanga kugadzirwa neMetal Coatings International) yakashandiswa sefirimu rakatetepa, risiri-electrolytic. Inopa kudzivirirwa kwepamusoro-soro kana ichienzaniswa neyakajairwa zinc electroplating kana inopisa-dip galvanizing, kunyanya kune zvinosunga simba-pamusoro apo hydrogen embrittlement inofanira kudzivirirwa. Iyo yekupfekedza inowanzoita simbi yesirivha-grey uye inoyera chete 5-12 μm mukukora, inochengetedza shinda yakakodzera uye dimensional kurongeka.
2. Hex Nuts: Dhizaini, Maitiro & Dimensions
2.1 Mhando dzeHex Nuts
Kune akati wandei akasiyana kuti asangane neakasiyana ekushanda zvinodiwa:
- Standard (Yapedzwa) Hex Nut - General-chinangwa, yakajairika fomu (ISO 4032 / DIN 934 / ASME B18.2.2).
- Heavy Hex Nut - Huru hupamhi kuyambuka mafurati uye hukuru hukuru hwezvimiro zvekushandisa (semuenzaniso, ASTM A563).
- Jam (Mutete) Nut - Yakaderedzwa ukobvu hwekukiya kana nzvimbo-inomanikidza kushandiswa.
- Nylon-Insert Lock Nut (Nylock) -Iripo-torque yekuvhara chimiro.
- Flange Nut - Yakabatanidzwa washer chiso chekuvandudza mutoro wekugovera.
2.2 Metric Hex Nut Dimensions (ISO 4032 / DIN 934)
Iyi tafura inotevera inopfupisa zviyero zvakakosha zveakajairwa metric saizi yeyakajairwa hex nzungu:
| Nominal Saizi | Pitch (mm) | Width Across Flats s (mm) | Width Across Makona e min (mm) | Ukobvu m (mm) | Approx. Huremu (g) |
| M6 | 1.0 | 10 | 11.05 | 5.2 | ~2.0 |
| M8 | 1.25 | 13 | 14.38 | 6.8 | ~4.5 |
| M10 | 1.5 | 17 | 18.90 | 8.4 | ~8.0 |
| M12 | 1.75 | 19 | 21.10 | 10.8 | ~12.5 |
| M16 | 2.0 | 24 | 26.75 | 14.8 | ~28 |
| M20 | 2.5 | 30 | 33.53 | 18.0 | ~50 |
Tafura 1: Yakasarudzwa metric hex nut zviyero (yakaenzana kukosha kwakavakirwa pa ISO 4032 / DIN 934).
2.3 Simba Magiredhi & Zvishandiso
Hex nzungu dzakaiswa mugiredhi zvinoenderana nemakanika zvivakwa zviyero. Makirasi emetric akajairwa anosanganisira Kirasi 6, 8, uye gumi (ISO 898-2). Makirasi epamusoro anoenderana neakakwira humbowo mutoro uye kuoma. Nezve zvimiro zvekushandisa, inorema hex nzungu inoenderana neASTM A563 kana EN zviyero zvinosarudzwa. Carbon simbi ndiyo yakajairika base zvinhu; simbi isina tsvina (A2 / A4) inoshandiswa kana inherent corrosion resistance inodiwa, kunyange zvazvo Dacromet-yakavharwa kabhoni simbi inowanzopa imwe inodhura-inoshanda yakakwirira-inoshanda imwe nzira.
3. Dacromet Coating Technology
3.1 Maumbirwo uye Chimiro
Dacromet imvura-yakavakirwa, isiri-electrolytic coating inosanganisirwa zinc uye aluminium flakes yakapararira mune inorganic chromium-oxide binder. Iyo firimu rinoguma rakatetepa (kazhinji 5-12 μm), simbi yesirivha muchimiro, uye inopa akawanda-layer dziviriro:
- Dziviriro yeBarriers - Flake layers inoparadzanisa iyo substrate kubva kune inoparadza midhiya.
- Galvanic (chibairo) kudzivirira - Zinc inoshanda seanode, inonyanya kukanganisa.
- Passivation - Metal oxides inononoka kuita ngura.
- Kuzvigadzirisa - Zinc oxides uye carbonates inotamira kunzvimbo dzakakuvadzwa.
3.2 Maitiro ekushandisa
Iyo yakajairika maitiro kutevedzana inodzivirira asidhi pickling, nekudaro kubvisa njodzi yehydrogen embrittlement:
- Kugadzirira kwepamusoro: Alkaline degreasing + mechanical descaling (pfuti blasting).
- Coating application: Dip-spin (inonyanya kufarirwa pazvisungo), spray, kana dip-drain.
- Flash-off / pre-drying pane mwero tembiricha kubvisa mvura.
- Kupisa kwekupisa kunosvika 280–320 °C kugadzira iyo inorganic matrix.
3.3 Corrosion Performance
Kuita kunowanzo kuongororwa nekusarerekera munyu-spray kuyedzwa (ISO 9227 / ASTM B117). Yakajairika mhedzisiro yeDacromet 320/500 masisitimu inoratidzwa pazasi:
| Giredhi / Rudzi | Coating Weight | Kuita kweKupfapfaidza Munyu (ISO 9227) |
| Dacromet 320/500 Giredhi A | ≈ 24 g/m² | 240 h pasina ngura chena; 600h hapana ngura tsvuku |
| Dacromet 320/500 Giredhi B | ≈ 36 g/m² | 240 h pasina ngura chena; 1000 h hapana tsvuku ngura |
| High-thickness systems | ≈ 80 g/m² | Yakawedzerwa cyclic / Kesternich kuramba |
Tafura 2: Yakajairika corrosion performance yeDacromet coatings (mhedzisiro inoenderana ne substrate, geometry, uye maitiro).
Zvimwe zvakanakira zvinosanganisira kupisa kupisa kusvika pa300 °C, kunaka kwekupenda, kudzorwa coefficient yekukwesha (kunyanya nejasi repamusoro rakagadzirwa sePLUS kana DACROLUB), uye kuenderana nealuminium (yakadzikira galvanic corrosion risk).
4. Zvikumbiro, Kuenzanisa & Mhedziso
4.1 Yakajairika Mashandisirwo eDacromet Hex Nuts
Nekuda kwekubatanidzwa kwavo kwesimba repamusoro, chaiyo geometry, uye yakasarudzika corrosion kuramba pasina hydrogen-embrittlement njodzi, Dacromet-yakavharwa hex nzungu inotsanangurwa zvakanyanya mu:
- Motokari: chassis, underbody, injini uye transmission fasteners (kazhinji Giredhi 10.9 / Kirasi 10).
- Marine uye mahombekombe emidziyo: matirairi, winches, zvimiro zvehardware.
- Kuvaka uye zvivakwa: kunze kwesimbi zvivakwa, mabhiriji, magadhi.
- Mhepo simba uye inorema michina: yakakwirira-simba mabhoti majoini akaoneswa nemamiriro ekunze.
- Chitima nemidziyo yekurima inoda hupenyu hurefu hwesevhisi mumhepo inoora.
4.2 Kuenzanisa neAlternative Coatings
| Property | Zinc Electroplating | Hot-Dip Galvanizing | Dacromet (Zinc Flake) |
| Typical Ukobvu | 5–15 μm | 40–100+ μm | 5–12 μm |
| Kupfapfaidza munyu (red rust) | ~72–300 h | ~500–1000+ h | 600–1000+ h |
| Hydrogen Embrittlement Ngozi | Hongu (inoda kubika) | Yakaderera / Pakati | Hapana |
| Thread Fit / Dimensional Impact | Minimal | Kazhinji zvinoda oversize nzungu | Minimal |
| Max Service Temperature | ~120 °C | ~200 °C | ~300 °C |
| Relative Cost | Low | Pakati | Pakati-Pamusoro |
Tafura 3: Kuenzanisa kutarisisa kweakajairwa fastener coatings.
4.3 Mhedziso
Dacromet hex nuts inomiririra yakakura, yepamusoro-inoshanda mhinduro inosanganisa kuvimbika kwemakanika kweyakagadzika hexagonal fasteners ine advanced zinc-aluminium flake corrosion dziviriro. Kupfeka kwavo kwakatetepa, kwakafanana kunochengetedza shinda chaiyo yejometri uye kubvisa kushushikana kwehydrogen-embrittlement kwakabatana nemaitiro emagetsi, zvichiita kuti zvive zvakanyanya kukodzera mamakisi akasimba anoshandiswa mukuchengetedzeka-yakakosha kana hupenyu hurefu hwekunze kwekushandisa.
Pakusarudza mafasteners, mainjiniya anofanirwa kufunga nezveiyo corrosion nharaunda, inodiwa tembiricha yebasa, torque / kukwesha zvinodiwa, uye mutengo wakanangana. Mumapurojekiti mazhinji emotokari, emugungwa, uye ezvivakwa, Dacromet-yakavharwa hex nzungu inopa yakanakisa chiyero chekuita, kuvimbika, uye huwandu hwehupenyu-kutenderera kukosha.
Sezvo mitemo yezvakatipoteredza ichiramba ichifarira chromium-yakadzikiswa kana chromium-isina dzimwe nzira (semuenzaniso, Geomet® masisitimu), iyo yakakura zinc-flake coating mhuri inoramba iri tekinoroji yakasarudzika yemazuva ano inodzivirira corrosion yekusimbisa mhinduro.
