ʻO nā Bolts Flange i uhi ʻia e Dacromet a me nā Nati Flange

2026-10-29

1. Hoʻolauna

ʻO nā Bolts Flange i uhi ʻia e Dacromet a me nā Nati Flange

ʻO kēlā me kēia hui i hoʻopaʻa ʻia he ikaika wale nō e like me kona hoa nāwaliwali loa. Hoʻopili ʻia ka ʻōpala flange ikaika kiʻekiʻe me ka nati hex maʻamau i pale ʻole ʻia galvanic couple, he pahele ʻino, a me ka hemahema o ka mahina e hiki mai ana. Hōʻike kēia ʻatikala i ka hui like - ʻO nā bolts flange i uhi ʻia e Dacromet (hex bolts me kahi huikau ma lalo o ke poʻo) a Nā hua flange i uhi ʻia e Dacromet (nā hua hex me ke kola flange kaʻa ʻana) - a wehewehe i ke kumu e lawe ai nā lālā ʻelua o ka hui i ka uhi palaki zinc-aluminum hoʻokahi.

ʻO ka uhi Dacromet - ke kaʻina hana zinc-flake non-electrolytic i wehewehe ʻia e ISO 10683 a ASTM F1136 - hāʻawi i 700 a 1,000 mau hola o ka paʻakai paʻakai (ASTM B117 neutral salt spray, NSS) i ka mua ʻula ʻula, ma kahi kiʻiʻoniʻoni lahilahi 8-12 μm, me ka ʻole hoʻoheheʻe hydrogen pilikia. Hoʻopili mau ʻia i ka bolt a nut, pale ia i ka ʻōnaehana hoʻopaʻa wili holoʻokoʻa: nā ʻili o ka lawe ʻana, nā alo flange, a me nā kaula i loko a me waho.

2. Nā ʻāpana ʻelua

2.1 Hex flange bolts

ʻO ka puʻupuʻu hex he puʻupuʻu poʻo hexagon me kahi puʻupuʻu pōʻai i hoʻohui ʻia (ka maka holoi i kūkulu ʻia) ma ka ʻili o lalo o ke poʻo. ISO 4162 / DIN 6921 a GB/T 5789 / GB/T 16674. Aia nā koho hoʻolālā:

Liʻiliʻi flange moʻo- ke anawaena bea paʻa no nā wahi kī paʻa;
Nui (ākea) pūʻulu flange- e lawe ana i ke anawaena ma kahi o 1.5 × d, e hoʻohaʻahaʻa i ke kaomi ʻili ma lalo o ke poʻo a hoʻemi i ka hoʻopili ʻana i nā mea palupalu e like me ka hoʻolei alumini;
ʻauʻau serrated- nā niho radial ma ka ʻaoʻao o lalo e nahu ana i ka ʻili i hoʻopaʻa ʻia, e hoʻonui ana i ke kū'ē ʻana i ka hoʻokuʻu ʻana i ka haʻalulu me ka ʻole o ka holoi laka ʻokoʻa.

3. No ke aha e pono ai ka Pūnaehana Kūlike no ka Hoʻomalu ʻino

ʻO ka pahu i uhi ʻia i ka zinc-flake e holo ana i loko o kahi ʻōpala a i ʻole i hoʻopaʻa ʻia i ka electro-plated a galvanic couple: ʻelua ʻāpana like ʻole e pili ana me kahi electrolyte (ua, condensation, paʻakai alanui). ʻO ka liʻiliʻi liʻiliʻi o ka ʻili e corrodes preferentially, hana ʻeleʻele keʻokeʻo (nā huahana hoʻohāhā zinc) a i ka hopena ʻula ʻula (ke kumu hao hao) ma kahi koʻikoʻi loa - nā kaula e lawe ana i ka preload. ʻO ka uhi ʻana i ka bolt a me ka nut me ka ʻōnaehana Dacromet hoʻokahi e hoʻohālikelike i nā mea hiki ke hoʻoneʻe a hoʻoneʻe i ka ikaika hoʻokele no ka hoʻouka kaua galvanic.

ʻAʻole pili ka hana ʻo Dacromet i ka pickling acid a ʻaʻohe electrolytic current, no laila ʻaʻohe hydrogen atomic i hoʻokomo ʻia i loko o ke kila. ʻO kēia ka mea i koho maʻamau no nā bolts flange ikaika kiʻekiʻe a me nā nati flange o ka papa waiwai 10.9 a me 12.9, kahi i hōʻole ʻia ai ka hydrogen embrittlement (HE) o nā mea hoʻopili electro-plated he pilikia i kākau ʻia.

4. Ka Hoʻohālikelike Hana Hana

Pūnaehana uhi (bolt + nut, papa 8.8)	Mānoanoa maʻamau	ʻO ka paʻakai i ka ʻōpala keʻokeʻo	ʻEhu paʻakai i ka ʻula ʻula (NSS)	ʻO ka hoʻoheheʻe ʻana o ka hydrogen
Electro-galvanized Zn5	5 μm	≈ 24 hola	≈ 72–96 hola	Pilikia kiʻekiʻe
Electro-galvanized Zn12	12 μm	≈ 72 hola	≈ 192 hola	Pilikia kiʻekiʻe
Mechanical galvanizing	25–40 μm	≈ 96 hola	≈ 400–500 hola	Haʻahaʻa
Hoʻopaʻa wela wela	45–85 μm	—	≈ 720 hola	Haahaa; pono e pa'i hou i na kaula, nui ka nui o ka nut
Dacromet DAC 320 (Papa 2)	8 μm	≈ 240 hola	≈ 720 hola	ʻAʻohe kokoke
Dacromet DAC 500 / ʻeleʻele	10–12 μm	≈ 480 hola	≈ 1,000 hola	ʻAʻohe kokoke

ʻO kahi pōmaikaʻi hou aʻe: pono e hoʻopaʻa ʻia nā nati galvanized wela i ka nui, e hōʻemi ana i ka ʻāpana shear pono o ka nati, ʻoiai ʻo Dacromet-coated flange nuts e mālama i ka maʻamau. 6H kaula hoʻomanawanui a me ka ikaika piha - ʻo ke kiʻi ʻoniʻoni lahilahi a paʻakikī e mālama i ke kūpono o ke kaula, no laila e hui pū ʻia nā bolts a me nā nati me ka ʻae ʻole a ʻaʻohe ʻehaʻeha o na ili i uhiia.

5. Ka hopena

Hoʻokumu ʻia nā bolts flange-coated a me nā flange nuts i kahi ʻōnaehana hoʻopaʻa ʻenehana: ʻo ka flange geometry e puʻunaue ana i ka ukana paʻa, hoʻopaʻa i ka haʻalulu haʻalulu, a hoʻopau i nā mea holoi ʻokoʻa, ʻoiai ʻo ka uhi ʻana o ka zinc-aluminum ma nā lālā ʻelua e pale ai i nā kāne galvanic, sila i nā ʻāpana ʻāpana, pale i ka ʻōpala keʻokeʻo a me nā hola ʻulaʻula10700. kila ikaika kiʻekiʻe me ka hoʻoheheʻe ʻia o ka hydrogen. ʻO ke kānāwai kikoʻī koʻikoʻi hoʻokahi i koe: e hoʻonohonoho i nā bolts a me nā nati e like me ka ʻōnaehana pale ʻana i ka corrosion.

ʻAʻole Loaʻa. Aʻe.

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