ʻO nā Bolts Flange i uhi ʻia ʻo Dacromet 

2. Ka hoomaopopo ana i ka Dacromet Coating Technology

ʻO Dacromet kahi ʻōnaehana hoʻoheheʻe zinc-aluminum non-electrolytic i hoʻopaʻa ʻia i ka wai i hana ʻia no nā mea hoʻopaʻa, e komo pū ana me nā bolts flange ikaika kiʻekiʻe. ʻAʻole e like me nā kaʻina hana electroplating maʻamau e waiho ai i nā ion metala ma o ke au uila, hoʻohana ke kaʻina hana Dacromet i kahi slurry i hoʻonohonoho pono ʻia me ka zinc flakes, alumini flakes, a me nā mea hoʻopaʻa inorganic ma ka ʻili o ka bolt. Ma hope o ka hoʻohana ʻia ʻana ma o nā ʻano dip-spin a i ʻole ka hoʻoheheʻe ʻana, e hoʻōla ʻia nā bolts i uhi ʻia i ka wela kiʻekiʻe (ma kahi o 300°C), kahi e hoʻoheheʻe ai i nā flakes i loko o kahi kiʻiʻoniʻoni pale i hoʻopaʻa paʻa ʻia.

He lahilahi loa ka uhi ʻana o Dacromet—maʻa mau ma waena o 6 a me 12 micrometers—eia naʻe e hāʻawi ana i ke kūpaʻa ʻino. Hoʻokumu ka zinc a me nā flakes alumini i kahi pale labyrinthine e hoʻolohi nui i ke komo ʻana o ka wai, oxygen, a me nā ion corrosive. I ka manawa like, hāʻawi ka zinc i ka pale ʻana (cathodic) i ka substrate kila i lalo o ka bolt, aʻo ka alumini a me nā mea chromate e hoʻonui i ka passivation a me ka lōʻihi anti-rust. ʻO kēia ʻōnaehana pale multi-mechanism kekahi o nā kumu nui ʻoi aku ka maikaʻi o Dacromet i ka plating zinc maʻamau a me ka galvanizing wela wela i nā hoʻokolohua corrosion wikiwiki.

ʻO ka mea nui, no ka mea ʻaʻole pili ka hana Dacromet i ka pickling acid a ʻaʻohe deposition electrolytic, ʻaʻole ia e hoʻokomo i ka hydrogen i loko o ka lattice kila o ka bolt. ʻO kēia kaʻina hana koʻikoʻi e hana ai i ka uhi ʻana o Dacromet i ka hydrogen embrittlement me ka manuahi - he mea pono i ka wā e uhi ai i nā bolts high-tensile flange o ka pae 10.9, 12.9, a i ʻole ASTM A490 kikoʻī.

3. Nā Pōmaikaʻi Nui o Dacromet Flange Bolts

3.1 Kūʻē Kūʻē Kūʻē a me ka Hana Anati-Rust

Loaʻa mau ʻo Dacromet coated flange bolts ma mua o 1,000 mau hola o ka pale ʻana i ka paʻakai paʻakai (ASTM B117 / ISO 9227) me ka ʻole o ke ʻano o ka ʻulaʻula. I ka nui o nā helu pāʻoihana, ua hoʻopaneʻe ʻia ka ʻōpala keʻokeʻo ma mua o 240 mau hola. ʻOi aku kēia kiʻekiʻe o ka hana anti-rust ma mua o nā pale zinc electroplated maʻamau, e hōʻike maʻamau i ka ʻulaʻula i loko o 72 a 200 mau hola ma lalo o nā kūlana hoʻāʻo like. ʻO ke kūpaʻa ʻoi aku ka maikaʻi o Dacromet mai kāna ʻano flake kūʻokoʻa a me ka hana synergistic o ka pale pale, ka pale zinc kaumaha, a me ka passivation kemika.

I loko o nā kaiapuni maoli—nā lewa kahakai, nā mea kanu kemika ʻoihana, nā lalo o nā kaʻa, a me nā paepae o waho—ʻoi aku ka lōʻihi o ko lākou kūpaʻa ʻana ma mua o nā mea hoʻopili maʻamau. Kāohi maikaʻi ka uhi ʻana i ka corrosion like ʻole a me ka lua kūloko, e hōʻoia ana i ka hoʻomau ʻana o ka bolt e hāʻawi i ka ikaika clamping hilinaʻi i kona ola lawelawe. Hoʻololi pololei kēia mana anti-rust koʻikoʻi i ka hoʻemi ʻana i nā kumukūʻai mālama, ka liʻiliʻi o nā pani i hoʻolālā ʻole ʻia, a me ka palekana o ke kūkulu ʻana.

3.2 Hoʻopau ʻole i ka hoʻoheheʻe ʻana o ka hydrogen

ʻO kekahi o nā pōmaikaʻi koʻikoʻi loa o ka uhi ʻana o Dacromet no nā bolts flange, ʻo ia ka mea he hydrogen embrittlement manuahi. Hiki ke ma'alahi ka ho'ohehe'e 'ana o ka hydrogen i ka hydrogen atomic hydrogen i loko o ka microstructure kila, ho'emi i ka ductility, a hiki ke hana i ka ha'iha'i hikiwawe, lohi ma lalo o ke kaumaha. ʻO nā kaʻina hana electroplating maʻamau e hoʻopuka i ka hydrogen ma ka cathode i ka wā o ka waiho ʻana metala, a ʻo ka hoʻomaʻamaʻa ʻana ma hope o ke kāwili ʻana ʻaʻole hiki ke hōʻoia i ka pau ʻana o ka hydrogen.

No ka mea ʻo Dacromet kahi uhi non-electrolytic i hoʻohana ʻia me ka ʻole o ka hoʻomaʻamaʻa mua ʻana o ka waikawa, ʻaʻohe hydrogen i hoʻokomo ʻia i loko o ka bolt i ka wā o ka hoʻopau ʻana. ʻO ka hoʻomaʻamaʻa ʻana i ka wela kiʻekiʻe e hōʻoiaʻiʻo i ka hoʻokuʻu ʻia ʻana o ka wai i koe. ʻO ka hoʻāʻo hoʻonaʻauao nui-me nā haʻawina e kākoʻo ana i ka ʻae ʻana o Dacromet no nā bolts structural bolts ʻo ASTM A490-ua hōʻoia ʻo Dacromet i uhi ʻia i nā bolts ikaika kiʻekiʻe e paʻa i ko lākou ikaika haʻihaʻi piha ʻoiai ma hope o ka lōʻihi o ka ʻike ʻana i nā kaiapuni corrosive. ʻO kēia ʻano hydrogen embrittlement manuahi e hana ai ʻo Dacromet i ka uhi koho no nā pili flange koʻikoʻi i nā turbines makani, nā alahaka, nā mea kaomi, a me nā noi chassis automotive.

3.3 U'i, Uhi Kaulike me ka uhi maikai loa

ʻAʻole e like me ka galvanizing wela, kahi e waiho ai i kahi papa zinc ʻano mānoanoa a i kekahi manawa like ʻole, hana ʻo Dacromet i kahi ʻāpana lahilahi a ʻaʻahu like ʻole e hahai ana i ka geometry pololei o nā kaula bolt, radius ma lalo o ke poʻo, a me ka alo flange. Mālama kēia ʻano like ʻole i ka hoʻopili ʻana i ke kaula i hoʻolālā ʻia a hiki i ka pilina torque-tension pololei i ka wā e hui ai. ʻO ke ʻano o ka hoʻohana ʻana i ka dip-spin e hōʻoia i ka loaʻa ʻana o nā geometries paʻakikī, nā wahi i hoʻomaha ʻia, a me nā ʻili o loko o nā bolts flange piha i ka pale anti-rust, me ka hoʻopau ʻana i nā wahi nāwaliwali e pili mau ana me nā uhi electroplated.

3.4 Kūʻai Kūʻai Kūʻai Kiʻekiʻe a me ka Paʻa Mechanical

Paʻa ka uhi ʻana o Dacromet i nā mahana lawelawe mau a hiki i 300°C, ʻoi aku ma mua o ka palena kūpono o ka hoʻoheheʻe zinc maʻamau (e hoʻomaka ana e hoʻohaʻahaʻa ma kahi o 100-120°C). He mea waiwai nui kēia kū'ē wela no nā bolts flange i hoʻohana ʻia i loko o nā keʻena ʻenekini, nā ʻōnaehana hoʻopau, nā umu ʻoihana, a me nā mea hana mana. Eia kekahi, ʻo ke kiʻi ʻoniʻoni Dacromet i hoʻōla ʻia e hōʻike i ke kūpaʻa maikaʻi ʻana i ka pōʻino mechanical i ka wā o ka lawelawe ʻana a me ka hoʻokomo ʻana, e mālama hou ana i ka corrosion lōʻihi a me ka hana anti-rust o ka bolt.