Nā Bolts Hex i uhi ʻia ʻo Dacromet

2026-10-27

1. Hoʻolauna

Hex bolts (hexagon head bolts) ʻo ia kekahi o nā mea paʻa i hoʻohana nui ʻia i ke kūkulu ʻana, nā mīkini, ka hui kaʻa, a me nā ʻoihana. I loko o nā kaiapuni corrosive - nā hale kahakai, nā mea kanu kemika, nā alaloa, nā alahaka, a me nā hale kiaʻi kila waho - ʻaʻole i hoʻoholo pinepine ʻia ke ola lawelawe o kahi hui bolted e ka ikaika o ke kila, akā ma ka lōʻihi o kona uhi pale.

ʻO ka uhi ʻana o Dacromet (ʻike pū ʻia ʻo DACROMET, Dacromet zinc-flake coating, a i ʻole zinc-aluminum flake coating) kahi hoʻololi hoʻololi-a-pale i hoʻokumu ʻia i ka wai i hoʻohana ʻia e ka dip-spin a i ʻole nā kaʻina spray a hoʻōla ʻia ma ka wela haʻahaʻa. Mai kona hana ʻia ʻana ma ʻAmelika Hui Pū ʻIa i nā makahiki 1970 a me kāna hana ʻenehana ma Iapana a me ʻEulopa, ua lilo ʻo Dacromet i mea hoʻonā pale pale corrosion no nā bolts kiʻekiʻe, ʻo ia hoʻi ma nā papa 8.8 a ma luna, kahi e lawe ai ka galvanizing wela wela i nā pilikia a me nā pilikia dimensional.

2. He aha ka Dacromet-Coated Hex Bolt?

ʻO kahi bolt hex i uhi ʻia ʻo Dacromet he bolt poʻo hexagon maʻamau (no ka ISO 4014 / ISO 4017 / DIN 931 / DIN 933 a i ʻole ASME B18.2.1) nona ka ʻili i pale ʻia e ka zinc-flake based coating i hoʻohana ʻia mai kahi slurry kumu wai i loaʻa:

ʻO nā ʻōpala Zinc a me nā ʻāpana alumini- ka pale pale corrosion ikaika (ka lākiō maʻamau ma kahi o 75% Zn / 25% Al ma ka ʻike paʻa);
ʻO nā pūhui Chromium a i ʻole nā passivators chromium-free- hāʻawi i ka passivation hoʻōla iā ia iho ma nā wahi ʻōpala;
ʻO nā mea hoʻopaʻa kino a me nā mea hoʻopaʻapaʻa cellulose- hoʻopaʻa i nā flakes i kahi kiʻiʻoniʻoni paʻa;
wai deionized- ka mea lawe, e hana ana i ke kaʻina hana VOC-noa a me ke kaiapuni.

Hoʻopili ʻia ka uhi ʻana ma ke kaomi ʻana (a i ʻole ka pulupulu ʻana) a ukali ʻia e ka milo centrifugal e wehe i ka slurry keu, a laila hoʻōla ʻia ma kahi o 280-330°C no 20-40 mau minuke. ʻO nā pōʻaiapuni dip-spin he nui (maʻamau ʻelua) e kūkulu i ka mānoanoa o ka uhi ʻana o 6-10 μm; hiki i nā papa kaumaha ke 12-15 μm.

ʻO nā hiʻohiʻona nui o ke kaʻina hana Dacromet

Hiʻona	wehewehe
Hoʻomaʻa wela	280–330°C (ma lalo o ka wela wela o ka papa 10.9/12.9 bolts)
Mānoanoa uhi	6–15 μm (pili papa), ʻoi aku ka lahilahi ma mua o ka galvanizing wela (45–85 μm)
ʻO ka hoʻoheheʻe ʻana o ka hydrogen	ʻAʻohe ʻakika ʻakika, ʻaʻohe electroplating - aneane ʻaʻohe pilikia e hoʻoheheʻe ʻia ka hydrogen
Pono ke poʻo hex	Mālama ʻia ka ʻili lahilahi a me ka ʻaʻahu like ʻole i ke ʻano geometry o ka milo
Hōʻike kaiapuni	Ka wai, ʻaʻohe VOC; Loaʻa nā ʻano like ʻole chromium-free (Cr³⁺/Cr⁶⁺-free)
Ka hoʻokuʻu uila	Conductive film, kūpono no ka grounding-koʻikoʻi hale

Papa 1. Nā hiʻohiʻona koʻikoʻi o ke kaʻina hana uhi Dacromet.

3. Mechanism hoomalu i ka poino

Mālama ʻo Dacromet i ka substrate kila ma o ʻekolu mau hana hoʻohui:

1.Barrier hopena- ʻO nā ʻāpana zinc a me nā alumini e hoʻopili ana i kahi kiʻiʻoniʻoni i hoʻopaʻa ʻia me kahi ala ʻawaʻawa e hoʻolohi nui i ke komo ʻana o ka wai, oxygen, a me nā ion chloride.

2.Sacrificial pale- ʻoi aku ka maikaʻi o ka zinc ma mua o ke kila; ma nā ʻōpala a ʻoki ʻia paha, ʻoi aku ka maikaʻi o ka hoʻoheheʻe ʻana o ka zinc i ke kila i ʻike ʻia.

3.Passivation / ho'ōla pilikino— Hoʻokumu nā passivators i nā kiʻi ʻoniʻoni ʻoniʻoni hiki ʻole ke hoʻoheheʻe ʻia ma nā wahi ʻino, "hoʻōla" i nā ʻōpala liʻiliʻi a me ka hoʻopaneʻe ʻana i ka ʻele keʻokeʻo a me ka ʻulaʻula.

ʻO ka hui pū ʻana o kēia mau hana ʻekolu e wehewehe i ke kumu e hāʻawi mau ai nā uhi Dacromet i 500-1,000 mau hola i ka ʻulaʻula i ka hoʻāʻo ʻana i ka paʻakai paʻakai kūʻokoʻa (ma ka ISO 9227 / ASTM B117) ma ka mānoanoa o 6-10 μm wale nō - he mau manawa ka hana o ka electro-galvanizing like me ka mānoanoa.

4. Ka hopena

Hoʻohui ʻia nā bolts hex i uhi ʻia ʻo Dacromet i ka ikaika mechanical o nā papa waiwai maʻamau 8.8-12.9 me kahi ʻōnaehana pale ʻāʻī, ʻaʻahu like ʻole, hydrogen-palekana, a me ke kaiapuni. Me ka hana ʻana o ka paʻakai paʻakai i ʻoi aku ka maikaʻi ma mua o ka electro-galvanizing ma kahi hapa o ka mānoanoa o ka hot-dip galvanizing, ua lilo ʻo Dacromet i mea kikoʻī paʻa no nā mea hoʻopaʻa ikaika kiʻekiʻe i ke koi ʻana i nā ʻoihana, ikehu, a me nā papahana kaʻa.

No nā mea kūʻai a me nā mea ʻenekinia, ʻo nā kumu hoʻoholo koʻikoʻi ka papa uhi (ka mānoanoa a me nā hola NSS), ʻano chromate (Cr³⁺ vs Cr-free), ka hoʻokele ʻana o ka friction, a me ka hoʻokō me ISO 10683 / ASTM F1136. Hāʻawi ʻia kahi bolt hex Dacromet i kuhikuhi pono ʻia i ka hiki ke wānana a me ka kūpaʻa hui lōʻihi - ʻoiai ma nā wahi ʻoi loa.

ʻAʻole Loaʻa. Aʻe.

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