Bolts na mkpụrụ osisi dacromet

2026-10-28

1. Okwu mmalite

Njikọ eriri na-esiwanye ike dịka akụrụngwa ya kachasị ike. Ihe mkpuchi hex dị elu nke Dacromet kpuchie n'ime mkpụrụ nwere zinc dị ọnụ ala abụghị usoro nchebe corrosion - ọ bụ cell galvanic na-eche ka ọ daa. Akị nke nwere zinc na-aghọ anode n'ime di na nwunye ahụ, na-emebi emebi nke ọma, na-ejide eriri bolt, na nkwonkwo dum na-atụfu ibu mwegide ya ogologo oge tupu bolt ahụ n'onwe ya egosipụta nchara na-acha uhie uhie ọ bụla.

N'ihi nke a, ọkachamara fastener nkọwa na-emeso mgbe niile bolts, akụ na washers dị ka otu ngwugwu nchedo corrosion dakọtara. Dacromet (zinc-aluminom flake, non-electrolytic) mkpuchi bụ usoro nhọrọ maka ngwugwu a: ọ na-enye eri ọ bụla - nwoke na nwanyị - ihe dị mkpa (5-12 μm), edo, ihe nkiri na-enweghị hydrogen nke na-adịgide adịgide 500-1,000 awa nke nnu nnu na-anọpụ iche (NSS) na-enweghị nchara ọcha ma ọ bụ nchara na-acha uhie uhie.

Isiokwu a na-akọwa ezinụlọ fastener metụtara, usoro corrosion na-awakpo nkwonkwo threaded, ihe kpatara Dacromet ji dabara bolts na mkpụrụ, yana otu esi akọwapụta na ikpokọta ihe nkedo bolt-nut-washer.

2. Otu nrụrụ na-esi alụso njikọ eriri

Eriri bụ geometry kacha emebi emebi na mgbakọ ngwa ngwa ọ bụla:

1.Crevice corrosion- oghere a na-ahụ anya dị n'etiti eriri eriri eriri na eriri nut na-ejide mmiri na electrolyte, na-emepụta oghere ikuku oxygen-agụụ ebe saịtị anodic na-etolite na olulu malite;

2.Galvanic corrosion- mkpuchi dị iche iche ma ọ bụ ọla (a Dacromet bolt na electro-plated nut, a igwe anaghị agba nchara na galvanized nut) chụpụrụ preferential corrosion nke obere mma akụrụngwa;

3.Coating mmebi na mgbakọ- eri scrape na gall n'oge tightening; A na-ebipụ obere electroplate na organic paints n'ụzọ dị mfe, na-ekpughe ígwè na-adịghị na mgbọrọgwụ eri;

4. nchekasị uche- mbụ ibu-ebu eri na-ebu a disproportionate òkè nke preload, otú corrosion olulu e ngwa ngwa ghọọ ike ọgwụgwụ cracks;

5.Fretting n'okpuru vibration- obere mmegharị n'etiti ihu ihu na-emebi ihe nkiri ahụ, na-akpọ nchara na-acha ọcha na nchara na-acha ọbara ọbara.

Ozugbo ngwaahịa nchara na-ewuli elu na eri ahụ, akị ahụ na-ejide, nkwụsịtụ na-agafe agafe nrụnye, na bolt ma ọ bụ stud na-emekarị ka a ga-ebipụ - kpochapụ "aku oyi kpọnwụrụ" ọdịda na nhazi ubi.

3. Nguzogide nrụrụ nke Ntọala dakọtara

Sistemụ mkpuchi (bolt + nut + washer)	Ọkpụrụkpụ	NSS ka nchara uhie	Eriri dabara mgbe mkpuchi	Hydrogen ebrittlement	Ọnụ ego efu
Agba larịị / onwe ya, mmanụ	—	<24 awa	Magburu onwe	Ọ dịghị	Kachasị ala
efere Zinc + chromate na-acha anụnụ anụnụ	5 μm	≈ 48h	Ọ dị mma	Elu	Dị ala
efere Zinc + nnukwu tri-passivate	8-12 mm	120–240 elekere	Ọ dị mma	Elu	Ọkara ala
Mechanical galvanizing	20-50 μm	300-800 h	Ọ dị mma	Dị nnọọ ala	Ọkara
galvanizing na-ekpo ọkụ na-ekpo ọkụ (akụgharị kụgharịrị)	45-85 μm	500–1,500 h	Achọrọ ịpịgharị ọzọ	Dị ala	Ọkara
Dacromet Klas 2 (flZn 8)	8 μm	≈ 720h	Magburu onwe	Ọ dịghị	Ọkara
Dacromet Klas 3 / ojii	10-12 μm	≈ 1,000 h	Magburu onwe	Ọ dịghị	Ọkara-elu

Tebụl 1. Usoro mkpuchi maka mgbakọ bolt-nut tụnyere (ụkpụrụ ụlọ ọrụ a na-ahụkarị).

N'ihi na mkpuchi a na-etinyere na okokụre, okpomọkụ-emeso akụkụ na gwọọ n'okpuru tempering okpomọkụ, ma bolts na mkpụrụ na-ha zuru n'ibu Njirimara - tensile ike, proof ibu na hardness kwa ISO 898-1 / ISO 898-2 - agbanwebeghị.

4. Omume kacha mma Mgbakọ

1.Never mix mkpuchi usoro- ụzọ Dacromet bolts naanị na mkpụrụ Dacromet na washers; di na nwunye agwakọta na-eme ka corrosion galvanic nke akụkụ ahụ adịghị ike (na-abụkarị zinc-plated);

2. Kwanyere tebụl torque ugwu- ụzọ abụọ Dacromet lubricated nwere ihe dị ala, kwụsiri ike karịa nchara; iji ụkpụrụ torque ochie na-eme ihe na-akawanye njọ ma nwee ike yipụ eri akị ahụ;

3.Edola mmanu mmanu- topcoat agbakwunyere na-esetịpụ ọnụọgụ esemokwu; mmanụ ọzọ na eri na-agbanwe K na-atụghị anya ya;

4.Uche na usoro jam-nut- mgbe a mkpa aku na a full nut na-stacked (classic kpochidoro ndokwa), ikesiike zuru nut megide mkpa nut;

5.Chekwa maka ịgba egwuna igwe anaghị agba nchara - topcoat mmanu nke Dacromet na-ebelatakwa ihe egwu galling na studs igwe anaghị agba nchara;

6.Verify akpa isiokwu torque-ụjọna skid ule, na-eji nchikota bolt-nut-washer n'ezie sitere na nza nrụpụta.

5. Mmechi

Corrosion ọdịda adịkarịghị amalite na shank nke a bolt - ọ na-amalite na eri, na crevice n'etiti bolt na aku. Ya mere nkwonkwo na-adịgide adịgide na-achọ a ngwungwu nchedo corrosion dakọtara: Dacromet kpuchie bolts, mkpụrụ na washers na otu zinc-flake usoro, kpọmkwem ọnụ (ISO 10683 / ASTM F1136, flZn 8/10, ≥ 720 h NSS), gbakọtara na ziri ezi torque na esemokwu ụkpụrụ. N'ihi bụ a threaded njikọ na-eguzogide ọcha nchara, red nchara, pitting, crevice ọgụ na ọdịdọ - site afọ nke nnu ịgba, ihu igwe na vibration.

Nke gara aga. Na-esote.

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