I-Dacromet-Coated Hex Bolts

2026-10-27

1. Isingeniso

Lonke ilunga eliboshiwe liyimpi emelene nokugqwala. I-hex bolt (i-hexagon head cap screw) ingase ibe isibophelelo esivame kakhulu emhlabeni, kodwa uma isifakwe ebhulohweni, embhoshongweni wokudlulisela izinto, noma esitshalweni samakhemikhali, ihlaselwa ngokushesha umswakama, umoya-mpilo, ama-ion e-chloride, ne-sulphur dioxide. Ukugqwala - kuqala ukugqwala okumhlophe (imikhiqizo ye-zinc oxidation), ke ukugqwala okubomvu (i-iron oxide) - ingena inqamula ezindaweni ezithwele, ingene emicu, futhi ekugcineni ibambe inati, yenza buthaka umthwalo we-clamp, futhi ibhubhise ilunga.

I-Dacromet coating (ebuye ibizwe ngokuthi i-DACROMET, i-zinc-flake coating, noma i-non-electrolytic zinc-aluminium flake coating) yathuthukiswa ngokunembile ukunqoba le mpi. Inikeza amabhawodi e-hex, izigxivizo, namantongomane e-hex afanayo namawasha isivikelo esincanyana, esifana nese-hydrogen esisinda ngaphezu kwamahora angama-700 esifutho sikasawoti esimaphakathi (NSS) - izikhathi ezimbalwa ukumelana nokugqwala kwe-electro-galvanizing ugqinsi olufanayo.

2. Izinto Eziyisisekelo Zokubopha: I-Hex Bolt Ekuhlanganiseni Okuboshiwe

Ibhawodi le-hex lisebenza nenadi (noma imbobo ecishiwe) ukuze ihlanganise izingxenye ezimbili noma ngaphezulu ndawonye. Ubuqotho bejoyinti buncike ku- ukulayisha kuqala (i-clamp load) eyethulwe ngesikhathi sokuqinisa, okulawulwa okusetshenzisiwe torque, iphimbo lentambo, kanye ne i-coefficient ye-friction (μ) phakathi kwezindawo ezithwele nemicu. Ekuhlanganiseni okulawulwa yitorque, onjiniyela baguqula ukulayisha kuqala okuqondiwe kube ivelu yetorque besebenzisa i- i-nut factor (K ≈ 0.12–0.16 yezinsimbi ezigcotshisiwe ze-zinc-flake).

Izingxenye zokukhwelana ezijwayelekile kumhlangano oboshiwe zihlanganisa:

I-Hex bolts / i-hex cap screws- intambo egcwele (DIN 933 / ISO 4017) noma intambo eyingxenye (DIN 931 / ISO 4014), isigaba sempahla 8.8, 10.9, noma 12.9;
Amantongomane e-Hex- ISO 4032 amantongomane ajwayelekile noma ISO 4033 amantongomane amancane/ajamu, ikilasi elifaniswe nebhawodi;
Amawasha ayisicaba(DIN 125) kanye amawasha asentwasahlobo (DIN 127) - ukusabalalisa umthwalo othwala futhi wengeze ukumelana nokudlidliza;
Izigxobo nezinduku ezinentambo- ngokuxhumeka okuphendukile kanye nemihlangano eboshwe ngebhawudi;
Amantongomane e-Flange nama-flange bolts- enama-flange ahlanganisayo ama-substrates athambile.

Ngayinye yalezi zingxenye kufanele yabelane ngesistimu efanayo yokuvikela ukugqwala; ibholidi ye-Dacromet ebhangqwe namantongomane angenalutho e-zinc yakha a umbhangqwana we-galvanic lokho kudela nati kuqala.

Amabhawudi e-Hex Ahlanganiswe nge-Dacromet (2)

3. Ukumelana Nokugqwala: I-Dacromet vs. Okunye I-Bolt Finishes

Ukubekezelela isifutho sikasawoti (ISO 9227 / ASTM B117, amahora ukuya ekugqwaleni okubomvu) kuwuphawu lwemboni lokuvikela ukugqwala kwe-fastener.

Qeda / uhlelo lokumboza	Ubukhulu	Amahora wokugqwala okubomvu (NSS)	Ukugqwala okumhlophe (NSS)	I-hydrogen embrittlement	Amanothi
I-Plain (imibalabala, egcotshwe amafutha)	—	< 24 h	—	Lutho	Ukusetshenziswa kwangaphakathi kuphela
I-Zinc Plating, i-chromate eluhlaza okwesibhakabhaka (Zn3)	5 umm	≈ 48 h	12–24 h	Phezulu	Izindleko eziphansi, izimpahla zabathengi
I-Zinc Plating, i-passivate ewugqinsi (Zn12)	12 um	≈ 192 h	96–168 h	Phezulu	Hhayi okwekilasi ≥ 10.9
I-Mechanical galvanizing	20-50 μm	300–800 h	200–400 h	Iphansi kakhulu	Ilungele izingxenye ezinkulu
I-Hot-dip galvanizing (HDG)	45–85 μm	500–1,500 h	200–500 h	Phansi	Imicu idinga ukuthepha kabusha
I-Dacromet Class 2	8 umm	≈ 720 h	300–500 h	Lutho	Ukunemba kwentambo njenge-cut
I-Dacromet Class 3 / emnyama	10-12 μm	≈ 1,000 h	500–720 h	Lutho	Ibhentshimakhi ye-OEM yezimoto

I-Dacromet nayo idlula i-zinc plating ku Ukuhlolwa kwe-Kesternich (SO₂ corrosion, ISO 6988 - umkhathi wezimboni nemvula ene-asidi), ku ukuhlolwa kwe-cyclic corrosion (CCT: isifutho sikasawoti esihlanganisiwe / umswakama / ukomisa), ku ukuhambisana kwe-galvanic nge-aluminium substrates (sibonga okuqukethwe kwe-aluminium flake), ku izinga lokushisa lokuhamba ngebhayisikili (ifilimu ye-inorganic imelana nesevisi engu-120–300°C, lapho amabhamuza ezinto eziphilayo), futhi ukumelana kwamakhemikhali kuma-salts omgwaqo kanye namakhemikhali okususa uqweqwe.

4. Isiphetho

Kuma-hex bolt kanye ne-hardware yawo yokukhwelana, i-Dacromet coating iletha ibhalansi engcono kakhulu yokuvikela ukugqwala, ukunemba komshini, nokuthembeka komhlangano okutholakalayo namuhla: ukubekezelela isifutho sikasawoti kuze kufike emahoreni ayi-1,000, ukungavikeleki ku-hydrogen embrittlement, i-geometry yentambo egciniwe, kanye nokungqubuzana okuzinzile komhlangano olawulwa yi-torque. Nomaphi lapho ilunga eliboshiwe kufanele liphile emvuleni, usawoti, kanye nesikhathi, incazelo okufanele uyikhumbule yile: i-hex bolt ephezulu, i-zinc-flake (i-Dacromet) eboshwe, i-ISO 10683 / ASTM F1136 iyahambisana.

Anginayo. Okulandelayo.

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