Hex Bolts nwere mkpuchi dacromet

2026-10-27

1. Okwu mmalite

Njikọ ọ bụla gbachiri agbachi bụ ọgụ megide corrosion. Ihe mkpuchi hex (hexagon head cap screw) nwere ike ịbụ ihe eji eme ihe na-adịkarị n'ụwa, ma ozugbo etinyere ya na akwa mmiri, ụlọ elu nnyefe, ma ọ bụ ụlọ ọrụ kemịkal, mmiri, oxygen, ion chloride, na sulfur dioxide na-awakpo ya ozugbo. Nchara - mbụ ajari ọcha (ngwaahịa oxidation zinc), mgbe ahụ ajari uhie (iron oxide) - creeps gafee ibu na-ebupụta, seeps n'ime eri, na-emecha seizes na aku, weakens na mwekota ibu, na-ebibi nkwonkwo.

E mepụtara mkpuchi dacromet (nke a na-akpọ DACROMET, mkpuchi zinc-flake, ma ọ bụ mkpuchi zinc-aluminom flake na-abụghị electrolytic) iji merie agha a. Ọ na-enye hex bolts, studs, na dakọtara hex nuts na washers a mkpa, edo, hydrogen-free ngwa agha na-adị ndụ ihe karịrị 700 awa nke nnọpụiche nnu ịgba (NSS) ule - ọtụtụ ugboro corrosion iguzogide electro-galvanizing n'otu ọkpụrụkpụ.

2. Fastener Basics: The Hex Bolt in a Bolted Joint

Ihe mkpuchi hex na-arụ ọrụ na aku (ma ọ bụ oghere apịaji) iji jikọta akụkụ abụọ ma ọ bụ karịa ọnụ. Iguzosi ike n'ezi ihe nke nkwonkwo na-adabere na buo ụzọ (ibu mgbochi) ewepụtara n'oge tightening, nke etinyere na-achịkwa torque, eriri eri, na ọnụ ọgụgụ esemokwu (μ) n'etiti ebe ebu na eri. N'ime mgbakọ a na-achịkwa torque, ndị injinia na-atụgharị ebugoro ebugoro ka ọ bụrụ uru torque site na iji nut ihe (K ≈ 0.12-0.16 maka ihe mkpuchi zinc-flake mmanụ aṅụ).

Ihe ndị a na-ahụkarị mating na mgbakọ akpọchiri gụnyere:

Hex bolts / hex okpu kposara- eri zuru oke (DIN 933 / ISO 4017) ma ọ bụ eri ele mmadụ anya n'ihu (DIN 931 / ISO 4014), klaasị 8.8, 10.9, ma ọ bụ 12.9;
Hex akụ- ISO 4032 mkpụrụ osisi ma ọ bụ ISO 4033 mkpa / jam, klaasị dabara na bolt;
Ndị na-asa akwa(DIN 125) na mmiri washers (DIN 127) - kesaa ibu ibu ma gbakwunye nguzogide vibration;
Studs na eriri eriri- maka njikọ flanged na site-bolted mgbakọ;
Mkpụrụ flange na flange bolts- na integral bear flanges maka nro mkpụrụ.

Nke ọ bụla n'ime ihe ndị a ga-ekekọrịta otu usoro nchebe corrosion; bolt Dacromet jikọtara ya na akị zinc nwere larịị na-emepụta a di na nwunye galvanic nke na-achụ aku mbụ.

3. Nguzogide corrosion: Dacromet vs. Bolt ndị ọzọ gwụchara

Ntachi obi nnu nnu (ISO 9227 / ASTM B117, awa ruo nchara na-acha uhie uhie) bụ akara ụlọ ọrụ maka nchebe corrosion ngwa ngwa.

Usoro ngwụcha / mkpuchi	Ọkpụrụkpụ	Oge awa ruo nchara uhie (NSS)	Nchara ọcha (NSS)	Hydrogen ebrittlement	Ihe ndetu
Larịị (agba nke onwe, mmanụ)	—	<24 awa	—	Ọ dịghị	Iji ime ụlọ naanị
Zinc plating, chromate na-acha anụnụ anụnụ (Zn3)	5 μm	≈ 48h	12–24 elekere	Elu	Ọnụ ala dị ala, ngwa ahịa
Zinc plating, nnukwu passivate (Zn12)	12 μm	≈ 192h	96–168 elekere	Elu	Ọ bụghị maka klas ≥ 10.9
Mechanical galvanizing	20-50 μm	300-800 h	200-400 h	Dị nnọọ ala	Ọ dị mma maka akụkụ buru ibu
Ịtụnye ọkụ na-ekpo ọkụ (HDG)	45-85 μm	500–1,500 h	200-500 h	Dị ala	Eriri chọrọ ịpịgharị ọzọ
Dacromet Klas 2	8 μm	≈ 720h	300-500 h	Ọ dịghị	Dị ka-ebipụ eri ziri ezi
Dacromet Klas 3 / ojii	10-12 μm	≈ 1,000 h	500-720 h	Ọ dịghị	Akpaaka OEM benchmark

Dacromet na-akakwa zinc plating n'ime Nyocha Kesternich (SO₂ corrosion, ISO 6988 - ikuku ụlọ ọrụ na mmiri ozuzo acid), na ule corrosion cyclic (CCT: ngwakọta nnu / iru mmiri / ihicha), n'ime galvanic ndakọrịta na aluminom substrates (n'ihi na aluminom flake ọdịnaya), na ịnya igwe okpomọkụ (ihe nkiri inorganic na-eguzogide ọrụ 120-300 ° C, ebe ihe mkpuchi organic na-agbapụta), na ọgwụ mgbochi ka nnu n'okporo ụzọ na kemịkalụ na-emebi emebi.

4. Mmechi

Maka hex bolts na ngwaike ha mating, mkpuchi Dacromet na-ebunye nguzozi kachasị mma nke nchebe corrosion, nkenke nrụzi, na ntụkwasị obi ọgbakọ dị taa: ntachi obi nnu ruo awa 1,000, mgbochi maka embrittlement hydrogen, geometry eri echekwara, na esemokwu kwụsiri ike maka mgbakọ na-achịkwa torque. Ebe ọ bụla nkwonkwo kpọchiri akpọchi ga-alanarị mmiri ozuzo, nnu na oge, nkọwapụta a ga-echeta bụ: Hex bolt nwere ike dị elu, zinc-flake (Dacromet) mkpuchi, ISO 10683 / ASTM F1136 kwekọrọ.

Enweghị. Na-esote.

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