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Dacromet Coating Bolts-A Comprehensive Guide kune Zinc-Aluminium Flake Coating Technology yeFasteners
2026-07-14
Dacromet (达克罗), inozivikanwawo se zinc-aluminium chromate coating, inyanzvi yemvura-yakavakirwa pamhepo, ine hushamwari hwepamusoro yekurapa tekinoroji inoshandiswa zvakanyanya pazvisungo zvesimbi. Kusiyana neyakajairwa electroplating, Dacromet inoshandisa firimu rakatetepa rekuputika zingi uye aruminiyamu flakes akasungwa neinorganic chromium makomisheni, achiendesa maawa 500–1,200 emunyu wekupfapfaidza kuramba pasina hydrogen embrittlement. Iri gwaro rinopa ongororo yakadzama yeDacromet coating system - kuumbwa kwayo, chimiro, maitiro, kuita, uye mashandisirwo muindasitiri yekumhanyisa.
1.Chii chinonzi Dacromet?
Dacromet yakagadzirwa mukupera kwema1960 nekambani yeAmerica Diamond Shamrock (yakazotevera MCI, ipapo NDS / Doerken MKS). Pakutanga yakasikwa kugadzirisa kutadza kwehydrogen embrittlement mumafasteners emotokari akasimba, yave inozivikanwa pasi rose anti-corrosion coating standard, yakatsanangurwa pasi pe ISO 10683, ASTM B695, uye dzakasiyana siyana yenyika (GB/T 18684 kuChina).
Hunhu Hunokosha
Non-electrolytic process: Dacromet inoshandiswa kuburikidza ne dip-spin coating, kwete electroplating. Hapana magetsi emagetsi anopfuura nepakati pezvikamu, achibvisa chizvarwa chehydrogen uye njodzi yakabatana yekuputira.
Flake-based coating: Iyo yekupfekedza ine microscopic zinc uye aluminium flakes (20-60 nm gobvu) inopindirana senge shingles edenga, ichigadzira dense, yakawanda-layered barriers.
Mutete uye yunifomu: Ukobvu hwekujairira hunoita 4–10 µm - mutete zvinokwana kuchengetedza shinda uye kushivirira, kusiyana negobvu rinopisa rinopisa.
Zvinoenderana nemamiriro ekunze: Yemazuvano Dacromet haina hexavalent chromium (Cr⁶⁺), inosangana neRoHS, REACH, uye ELV (End-of-Life Vehicle) mirairo.
Inodzivirira kupisa: Iyo inorganic coating inomira inoenderera sevhisi tembiricha inosvika 250 ° C, ichiita kuti ive yakakodzera kune injini bay uye exhaust-yakatarisana fasteners.
2.Key Advantages
Superior corrosion resistance: 500–1,200 maawa ekusarerekera munyu pfapfaidzo (NSS) pa ISO 9227 - 5-10 nguva iri nani pane yakajairwa zinc plating (96–240 hrs).
Zero hydrogen embrittlement: Iyo isiri-electrolytic process inobvisa hydrogen absorption, ichiita Dacromet iyo yakasarudzika yekupfeka kune yakakwirira-simba fasteners (Grade 8.8-12.9) uko electroplating inorambidzwa kana kurambidzwa.
Yakanakisa coating kufanana: Dip-spin coating inovhara pakadzika, maburi mapofu, uye yakaoma geometries zvakafanana pane electroplating kana inopisa-dip galvanizing. Thread crests nemidzi inowana kufukidzwa kwakafanana.
Mucheka wakaonda, wakachengetedzwa kushivirira: Pa4-10 µm, Dacromet haikanganise netambo yekubatana kana torque-tension hukama. Hapana kudzvanyazve kwenzungu kunodiwa, kusiyana nekupisa-dip galvanized fasteners.
Heat resistance: Iyo inorganic ceramic-like coating inochengetedza zvidziviriro zvayo patembiricha inosvika 250 ° C (inoenderera) uye 300 ° C (nguva pfupi), inodarika organic coatings.
Kutevedza kwezvakatipoteredza: Yemahara yeCr⁶⁺, inoenderana neRoHS, REACH, uye ELV mirairo. Mvura-based coating liquid ine yakaderera VOC emissions kana ichienzaniswa neye solvent-based alternatives.
Kunamatira kwakanaka uye kuramba kupfeka: Iyo kemikari yakasungirirwa flake coating inoramba kupeta, kukwenya, uye kubata kukuvadzwa zvirinani pane zvakajairika plating.
3. Kuenzanisa nemamwe ma Coatings
Tafura iri pazasi inofananidza Dacromet neaviri anowanzo kuvharirwa machira ekubatisa dzimwe nzira - electroplated zinc plating uye inopisa-dip galvanizing:
| Property | Dacromet | Zinc Plating | Hot-Dip Galvanizing |
| Kupfapfaidza munyu (maawa) | 500 - 1,200 | 96 – 240 | 300 - 1,000 |
| Hydrogen Embrittlement | Hapana | Njodzi (Grade 10.9+) | Hapana |
| Coating Ukobvu | 4 – 10 µm | 5 – 25 µm | 45 - 85 µm |
| Cr⁶⁺ Yemahara | Hongu (yazvino) | Inosiyana | Hongu |
| Coating Uniformity | Excellent | Zvakanaka | Variable (drainage) |
| Thread Fit Impact | Zvidiki (mutete) | Low | Yakakosha (yakakora) |
| Heat Resistance | Kusvikira ku300°C | Kusvikira ku200 ° C | Kusvikira ku250 ° C |
| Chitarisiko | Sirivha-grey, matte | Bhuruu-chena / yakajeka | Bright / spangled |
| Cost Level | Pakati | Low | Pakati |
Kupfapfaidza munyu pa ISO 9227 NSS. Hydrogen embrittlement njodzi inoshanda kune electroplated fasteners Grade 10.9 uye pamusoro.
4. Applications
Motokari: Zvikamu zveinjini, chassis fasteners, brake system, suspension parts, uye underbody hardware. Dacromet inotsanangurwa nemaOEM makuru (VW, Toyota, GM, Ford) epamusoro-simba mabhaudhi (Giredhi 8.8-10.9) uko hydrogen embrittlement inofanira kudzivirirwa.
Kuvaka & zvivakwa: Simbi chimiro chekubatanidza, bhiriji hardware, tunnel fasteners, uye kongiri formwork zvisungo zvakafumurwa kune hunyoro uye nharaunda dzinoparadza.
Magetsi & simba: Transmission tower bolts, switchgear hardware, uye magetsi enclosure fasteners inoda kusimba kwekunze kwenguva refu.
Railway & chekufambisa: Rolling stock fasteners, track components, uye signing equipment hardware yakafumurwa ku de-icing salts uye atmospheric corrosion.
Marine & coastal: Dock neharbor hardware, offshore platform fasteners, uye midziyo iri munyu-yakaremerwa nemhepo (inowedzerwa nesealer topcoat yekudzivirira kwakanyanya).
Mhepo simba: Shongwe flange mabhoti, nacelle Hardware, uye hwaro anchor mabhaudhi inoda makumi emakore ekuchengetedza-isina corrosion dziviriro.
Zvishandiso & HVAC: Heat exchanger fasteners, midziyo yevira, uye yekunze unit hardware uko kupisa kwekudzivirira uye kudzivirira ngura zvinodiwa zvese.
Summary
Dacromet inopupurirwa, yakakwirira-inoshanda anti-corrosion coating tekinoroji yezvitsigiro zvesimbi. Yayo yakasarudzika zinc-aluminium flake chimiro, inoshandiswa kuburikidza ne-isina-electrolytic dip-spin process, inopa 500-1,200 maawa emunyu wekupfapfaidza kuramba pasina hydrogen embrittlement - ichiiita iyo yakasarudzika yesarudzo yemabhaudhi akasimba mumotokari, kuvaka, uye simba zvikamu. Iine firimu rayo rakatetepa, rakafanana, kutevedzera kwezvakatipoteredza, uye yakanakisa kupisa kupisa, Dacromet inovhara mukaha pakati peinodhura zinc plating uye inodhura Stainless simbi, ichipa mwero wakakwana wekuita, kuvimbika, uye mutengo wekuda fastener application.
