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I-Dacromet-Coated Hex Bolts
2026-10-27
1. Isingeniso
Amabhawodi e-Hex (ama-hexagon head bolts) aphakathi kwezixhumi ezisetshenziswa kakhulu ekwakhiweni, emishinini, ekuhlanganiseni kwezimoto, nakwingqalasizinda. Ezindaweni ezonakalisayo - izakhiwo ezisogwini, izitshalo zamakhemikhali, imigwaqo emikhulu, amabhuloho, nemibhoshongo yensimbi yangaphandle - impilo yesevisi yejoyinti eliboshiwe ngokuvamile ayinqunywa amandla ensimbi, kodwa ukuqina kokunamathela kwayo okuyisivikelo.
I-Dacromet coating (eyaziwa nangokuthi i-DACROMET, i-Dacromet zinc-flake coating, noma i-zinc-aluminium flake coating) iyimbobo yokuguqula-ne-barrier esekelwe emanzini esetshenziswa yi-dip-spin noma izinqubo zokufutha futhi yelashwe ekushiseni okuphansi. Selokhu yasungulwa e-United States ngeminyaka yawo-1970 kanye nezimboni ezalandela e-Japan naseYurophu, i-Dacromet isiphenduke isixazululo esivamile sokuvikela ukugqwala kwamabhawodi anamandla amakhulu, ikakhulukazi ebangeni lesi-8.8 nangaphezulu, lapho ugesi wendabuko oshisayo uthwala ubungozi bokufakwa kwe-hydrogen kanye nezinkinga zobukhulu.
2. Iyini i-Dacromet-Coated Hex Bolt?
Ibhawodi ye-hex ehlanganiswe ne-Dacromet iyibhawodi yekhanda eliyi-hexagon ejwayelekile (ngokwe-ISO 4014 / ISO 4017 / DIN 931 / DIN 933 noma i-ASME B18.2.1) indawo yayo ivikelwe i-zinc-flake esekelwe i-zinc-flake esetshenziswa odongeni olusekelwe emanzini oluqukethe:
- Ama-zinc flakes nama-aluminium flakes- isithiyo esisebenzayo sokuvikela ukugqwala (isilinganiso esijwayelekile esingama-75% Zn / 25% Al ngokuqukethwe okuqinile);
- Izinhlanganisela ze-Chromium noma ama-passivator angenayo i-chromium- nikeza amandla okuzilapha ezindaweni zokuklwebheka;
- Izibophezelo ze-inorganic kanye nama-cellulose thickeners- hlanganisa ama-flakes abe yifilimu eqinile, enamathelayo;
- Amanzi enziwe deionized- indlela yokuphatha, eyenza inqubo ingabi ne-VOC futhi ivumelane nemvelo.
I-coating isetshenziswa ngokucwilisa (noma ngokufafaza) kulandele ukuphotha okumaphakathi ukuze kukhishwe udaka oludlulele, bese kwelapheka cishe ku-280-330 ° C imizuzu engu-20-40. Imijikelezo ye-dip-spin eminingi (imvamisa emibili) yakha ukujiya kokunamathela okungu-6–10 μm; amakilasi asindayo afinyelela ku-12-15 μm.
Izimpawu Ezisemqoka Zenqubo Ye-Dacromet
| Isici | Incazelo |
| Ukwelapha izinga lokushisa | 280–330°C (ngaphansi kwezinga lokushisa lezinga elingu-10.9/12.9 lamabhawudi) |
| Ukuqina kwe-coating | 6–15 μm (kuncike ekilasini), izacile kakhulu kune-hot-dip galvanizing (45–85 μm) |
| I-hydrogen embrittlement | Ayikho i-acid pickling, akukho electroplating - cishe ayikho ingozi ye-hydrogen embrittlement |
| Ukulingana kwekhanda le-Hex | Ukumboza okuzacile, okufanayo kulondoloza ijometri yentambo - amabhawodi ahlangana nompompi namantongomane ajwayelekile |
| Iphrofayili yezemvelo | Okusekelwe emanzini, akukho kukhishwa kwe-VOC; okuhlukile kwe-chromium (Cr³⁺/Cr⁶⁺-free) kuyatholakala |
| I-conductivity kagesi | Ifilimu ye-conductive, ilungele izakhiwo ezibucayi |
Ithebula 1. Izici ezibalulekile zenqubo yokugqoka i-Dacromet.
3. Indlela Yokuvikela Ukugqwala
I-Dacromet ivikela i-substrate yensimbi ngokusebenzisa izindlela ezintathu ezihambisanayo:
1.Umphumela wokuvimbela- ama-zinc agqagqene kanye nama-aluminium flakes enza ifilimu elaminethiwe ngendlela ehlukumezayo ebambezela ngokumangalisayo ukungena kwamanzi, umoya-mpilo, nama-ion e-chloride.
2.Ukuvikelwa komhlatshelo- i-zinc ayilungile kunensimbi; kunoma yikuphi ukuklwebheka noma unqenqema olusikiwe, i-zinc igqwala ngokukhethekile futhi ivikela insimbi eveziwe.
3.Ukuzila ukudla/ukuziphilisa- ama-passivators akha amafilimu e-insoluble oxide ezindaweni ezilimele, "elapha" imihuzuko emincane futhi alibazisa ukugqwala okumhlophe kanye nokugqwala okubomvu.
Inhlanganisela yalezi zindlela ezintathu ichaza ukuthi kungani izimbotshana ze-Dacromet zivamise ukuletha amahora angama-500–1,000 ekugqwaleni okubomvu ekuhlolweni kwesifutho sikasawoti esingathathi hlangothi (nge-ISO 9227 / ASTM B117) ebugqileni obungu-6–10 μm kuphela — izikhathi ezimbalwa ukusebenza kokuqina okulinganayo kwe-electro-galvanizing.
4. Isiphetho
Amabhawodi e-hex ahlanganiswe ne-Dacromet ahlanganisa amandla emishini yamakilasi ezakhiwo ezijwayelekile angu-8.8–12.9 nohlelo oluncane, olufana nolunye, oluphephile nge-hydrogen, kanye nesistimu yokuvikela ukugqwala kwemvelo. Ngokusebenza kwesifutho sikasawoti esingcono izikhathi eziningana kune-electro-galvanizing engxenyeni yogqinsi lwe-hot-dip galvanizing, i-Dacromet isiphenduke isicaciso esizenzakalelayo sezibophelelo eziqine kakhulu kwingqalasizinda edinga amandla, amandla, kanye nemiklamo yezokuthutha.
Kubathengi nonjiniyela, izici eziyinhloko zesinqumo isigaba sokumboza (ubukhulu namahora we-NSS), uhlobo lwe-chromate (i-Cr³⁺ iqhathaniswa ne-Cr-free), ukulawula i-coefficient, kanye nokuthobelana ne-ISO 10683 / ASTM F1136. Ibhawodi ye-Dacromet hex ecaciswe kahle iletha ubuqotho obuhlangene obubikezelwe, besikhathi eside - ngisho nasezimweni ezinzima kakhulu.
