Nā Bolts Hex i uhi ʻia ʻo Dacromet

2026-10-27

1. Hoʻolauna

ʻO kēlā me kēia hui i hoʻopaʻa ʻia he kaua kūʻē i ka corrosion. ʻO ka hex bolt (hexagon head screw screw) ka mea hoʻopaʻa maʻamau ma ka honua, akā ke kau ʻia i loko o ke alahaka, ka hale kiaʻi hoʻouna, a i ʻole kahi mea kanu kemika, ua hoʻouka koke ʻia e ka wai, oxygen, chloride ions, a me sulfur dioxide. Rus - mua ʻeleʻele keʻokeʻo (nā huahana hoʻoheheʻe zinc), a laila ʻula ʻula (iron oxide) - ke kolo nei ma nā ʻaoʻao o ke alo, komo i loko o nā kaula, a hopu i ka nut, hoʻonāwaliwali i ka ukana pipili, a hoʻopau i ka hui.

ʻO ka uhi Dacromet (i kapa ʻia ʻo DACROMET, zinc-flake coating, a i ʻole electrolytic zinc-aluminum flake coating) i hoʻomohala pololei ʻia e lanakila i kēia kaua. Hāʻawi ia i nā bolts hex, studs, a me nā nati hex like ʻole a me nā mea holoi lole ʻeleʻele, ʻaʻahu, hydrogen-free pale kaua e ola ana ma mua o 700 mau hola o ka hoʻāʻo ʻana i ka paʻakai kūʻokoʻa (NSS) - ʻoi aku ka nui o ka pale ʻana o ka electro-galvanizing i ka mānoanoa like.

2. Nā Kuleana Hoʻopaʻa: ʻO ka Hex Bolt i kahi hui i hoʻopaʻa ʻia

Hoʻohana ʻia kahi bolt hex me ka nati (a i ʻole ka lua i kī ʻia) e hoʻopili i ʻelua ʻāpana a ʻoi aku paha. ʻO ka pono o ka hui e pili ana i ka preload (ka hoʻouka clamp) i hoʻokomo ʻia i ka wā o ka hoʻopaʻa ʻana, i mālama ʻia e ka mea i hoʻopili ʻia torque, ke kani o ke kaula, a me ka pākuʻi huikau (μ) ma waena o nā ʻili pili a me nā kaula. I loko o ka hui i hoʻopaʻa ʻia i ka torque, hoʻololi nā mea ʻenekinia i ka preload target i loko o ka waiwai torque me ka hoʻohana ʻana i ka kumu nut (K ≈ 0.12–0.16 no nā mea paʻa i uhi ʻia i ka zinc-flake).

ʻO nā ʻāpana male maʻamau i loko o kahi hui bolted e komo pū ana:

Hex bolts / hex pāpale wiliwili— lola piha (DIN 933 / ISO 4017) a i ole lola hapa (DIN 931 / ISO 4014), papa waiwai 8.8, 10.9, a i ole 12.9;
Nā hua hex— ISO 4032 nati maʻamau a i ʻole ISO 4033 thin/jam nuts, papa i hoʻohālikelike ʻia me ka bolt;
ʻO nā mea holoi paʻa(DIN 125) a nā mea holoi puna (DIN 127) - e puʻunaue i ka haʻawe amo a hoʻohui i ke kūpaʻa haʻalulu;
Nā lāʻau a me nā lāʻau kaula- no nā pili flanged a me nā hui i hoʻopaʻa ʻia;
ʻO nā hua flange a me nā bolts flange- me nā flanges hui pū no nā substrates palupalu.

Pono e kaʻana like kēlā me kēia mau ʻāpana i ka ʻōnaehana pale-corrosion; ʻO ka pahu Dacromet i hoʻohui ʻia me ka nati i hoʻopaʻa ʻia i ka zinc maʻemaʻe galvanic couple e kaumaha mua ana i ka nut.

3. Kū'ē Kū'ē: Dacromet vs. Nā Hoʻopau Bolt ʻē aʻe

ʻO ka hoʻomanawanui ʻana o ka paʻakai paʻakai (ISO 9227 / ASTM B117, mau hola i ka ʻulaʻula) ʻo ia ka pae o ka ʻoihana no ka pale ʻana i ka corrosion.

ʻōnaehana hoʻopau / uhi	mānoanoa	Nā hola i ka ʻula ʻula (NSS)	ʻAi keʻokeʻo (NSS)	ʻO ka hoʻoheheʻe ʻana o ka hydrogen	Nā memo
Plain (ʻulaʻula ponoʻī, ʻaila)	—	< 24 hola	—	ʻAʻohe	Hoʻohana i loko wale nō
ʻO ka paʻi zinc, chromate polū (Zn3)	5 μm	≈ 48 hola	12–24 h	Kiʻekiʻe	ʻO ke kumukūʻai haʻahaʻa, nā mea kūʻai aku
ʻO ka hoʻoheheʻe zinc, ka paʻakai mānoanoa (Zn12)	12 μm	≈ 192 hola	96–168 h	Kiʻekiʻe	ʻAʻole no ka papa ≥ 10.9
Mechanical galvanizing	20–50 μm	300–800 hola	200–400 hola	Haahaa loa	Maikaʻi no nā ʻāpana nui
Hoʻopuʻu wela (HDG)	45–85 μm	500–1,500 hola	200–500 hola	Haʻahaʻa	Pono e hoʻopaʻa hou i nā kaula
Papa Dacromet 2	8 μm	≈ 720 hola	300–500 hola	ʻAʻohe	ʻOki ʻoki pono milo
Papa Dacromet 3 / ʻeleʻele	10–12 μm	≈ 1,000 hola	500–720 hola	ʻAʻohe	ʻO ka hōʻailona OEM kaʻa

ʻOi aku ka maikaʻi o Dacromet i ka hoʻoheheʻe zinc ma ka Hoao Kesternich (SO₂ corrosion, ISO 6988 - nā ea ʻenehana a me ka ua waikawa), ma hoʻāʻo ʻino ʻino (CCT: hui ʻia ka paʻakai paʻakai / humidity / maloʻo), ma galvanic compatibility me nā substrate alumini (e hoʻomaikaʻi i ka ʻike alumini flake), ma kaʻa kaʻa wela (ʻo ke kiʻiʻoniʻoni ʻole ke kū i ka lawelawe 120–300°C, kahi e poha ai nā mea hoʻonaninani kūlohelohe), a ma pale kemika i nā paʻakai alanui a me nā kemika de-icing.

4. Ka hopena

No nā bolts hex a me kā lākou mau lako pili, hāʻawi ʻo Dacromet coating i ke koena maikaʻi loa o ka pale ʻana i ka corrosion, ka pololei mechanical, a me ka hilinaʻi o ka hui i loaʻa i kēia lā: ka paʻakai paʻakai a hiki i 1,000 mau hola, ka pale ʻana i ka hydrogen embrittlement, mālama ʻia ka geometry thread, a me ka friction paʻa no ka hui hoʻomalu ʻia. Ma nā wahi a pau e ola ai ka hui i ka ua, ka paʻakai, a me ka manawa, ʻo ka ʻōlelo kikoʻī e hoʻomanaʻo ai: kiʻekiʻe-ikaika hex bolt, zinc-flake (Dacromet) i uhi ʻia, ISO 10683 / ASTM F1136.

ʻAʻole Loaʻa. Aʻe.

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