Dacromet kpuchie Flange Bolts 

2. Ịghọta teknụzụ mkpuchi mkpuchi Dacromet

Dacromet bụ usoro mkpuchi mmiri na-abụghị nke zinc-aluminom flake nke emebere maka ngwa ngwa, gụnyere bolts flange dị elu. N'adịghị ka usoro electroplating ọdịnala nke na-etinye ion ígwè site na ọkụ eletrik, usoro Dacromet na-emetụta slurry ejiri nlezianya mee nke nwere zinc flakes, flakes aluminum, na inorganic binders n'elu bolt. Mgbe etinyere ya site na usoro ntinye-spin ma ọ bụ ịgbasa, a na-enweta ọgwụgwọ okpomọkụ dị elu (nke dị ihe dị ka 300 Celsius C), nke na-eme ka flakes ahụ bụrụ ihe ejikọtara nke ọma, ihe nkiri nchebe nwere ọtụtụ.

Ihe mkpuchi Dacromet na-esi na ya pụta dị oke mkpa-na-adịkarị n'etiti 6 na 12 micrometers-ma na-anapụta nguzogide corrosion pụtara ìhè. Zinc na flakes aluminom na-ekpuchi ekpuchi na-emepụta ihe mgbochi labyrinthine nke na-ebelata ntinye nke mmiri, oxygen na ion corrosive. N'otu oge ahụ, zinc na-enye nchebe ịchụ aja (cathodic) na ihe nchara nchara nke bolt, ebe aluminom na chromate components na-eme ka ngafe na njedebe mgbochi nchara. Usoro nchebe ọtụtụ ihe eji arụ ọrụ bụ otu n'ime isi ihe kpatara Dacromet ji arụpụta ụdị zinc plating na ọbụna na-ekpo ọkụ na-ekpo ọkụ n'ọtụtụ ule corrosion gbagoro agbago.

Ihe dị mkpa, n'ihi na usoro Dacromet na-agụnye enweghị acid pickling na enweghị electrolytic nkwụnye ego, ọ dịghị ewebata hydrogen n'ime ígwè lattice nke bolt. Njirimara usoro a dị mkpa na-eme ka mkpuchi Dacromet kpamkpam hydrogen embrittlement n'efu - uru dị oke mkpa mgbe ị na-ekpuchi bolts flange dị elu nke ọkwa 10.9, 12.9 ma ọ bụ nkọwa ASTM A490.

3. Isi uru nke Dacromet Flange Bolts

3.1 Nguzogide nrụrụ pụrụiche yana arụrụ nchara

Dacromet mkpuchi flange bolts na-enweta ihe karịrị awa 1,000 nke nguzogide nnu na-anọpụ iche (ASTM B117 / ISO 9227) na-enweghị ọdịdị nke nchara na-acha ọbara ọbara. N'ọtụtụ akara ule azụmahịa, nchara ọcha na-egbu oge karịa awa 240. Ọkwa a nke mgbochi nchara karịrị nke ọkọlọtọ zinc mkpuchi, nke na-egosipụtakarị nchara na-acha uhie uhie n'ime awa 72 ruo 200 n'okpuru ọnọdụ nnwale ahụ. Nguzogide corrosion kacha elu nke Dacromet sitere na nhazi flake ya pụrụ iche yana mmemme mmekọrịta nke ihe mgbochi, nchebe zinc ịchụ aja, na ngafe kemịkalụ.

N'ime gburugburu ụwa - ikuku dị n'ụsọ oké osimiri, osisi kemịkalụ ụlọ ọrụ mmepụta ihe, ụgbọ ala ụgbọ ala, na ikpo okwu ndị dị n'ụsọ osimiri - Dacromet flange bolts na-ejigide iguzosi ike n'ezi ihe ha ogologo oge karịa ihe mkpuchi mkpuchi. Ihe mkpuchi ahụ na-egbochi ma corrosion otu na mpaghara mpaghara, na-ahụ na bolt na-aga n'ihu na-enye ike njide a pụrụ ịdabere na ya n'oge ndụ ya niile. Ike mgbochi nchara a pụtara ìhè na-asụgharị ozugbo gaa na ọnụ ahịa mmezi mbelata, mmechi na-enweghị atụmatụ dị ntakịrị, yana nkwalite nchekwa ụlọ.

3.2 Hydrogen Embrittlement zuru oke

Otu n'ime uru dị oke egwu nke mkpuchi Dacromet maka flange bolts bụ na ọ bụ n'efu na hydrogen embrittlement. Mgbochi ígwè dị elu na-enwekarị ike ịnweta hydrogen embrittlement, ihe omume nke atomiki hydrogen na-agbasa n'ime microstructure ígwè, na-ebelata ductility, ma nwee ike ime ka mgbaji na mberede, na-egbu oge n'okpuru nrụgide tensile. Usoro electroplating omenala na-emepụta hydrogen na cathode n'oge ntinye ígwè, na ọbụna ịsa mmiri nke ọma mgbe a na-etinye efere enweghị ike ikwe nkwa iwepụ hydrogen zuru ezu mgbe niile.

N'ihi na Dacromet bụ mkpuchi na-abụghị electrolytic etinyere na-enweghị pretreatment acid, ọ dịghị hydrogen a na-ewebata n'ime bolt n'oge imecha usoro. Ịgwọ okpomọkụ dị elu na-esote na-eme ka a hụ na a ga-ewepụ mmiri ọ bụla fọdụrụnụ. Nnwale ntozu sara mbara-gụnyere ọmụmụ ihe na-akwado nnabata Dacromet maka ASTM A490 bolts structural - akwadola na Dacromet kpuchie bolts dị elu na-ejigide ike mgbaji ha zuru oke ọbụlagodi mgbe ogologo oge gachara na gburugburu ebe na-emebi emebi. Ihe njiri mara ikuku hydrogen a na-eme Dacromet ka ọ bụrụ mkpuchi nhọrọ maka njikọ flange dị oke mkpa na igwe ikuku, àkwà mmiri, akụrụngwa nrụgide na ngwa chassis ụgbọ ala.

3.3 dị gịrịgịrị, mkpuchi akwa na mkpuchi mara mma

N'adịghị ka galvanizing na-ekpo ọkụ, nke na-edobe oyi akwa zinc na-enweghị isi na mgbe ụfọdụ, Dacromet na-emepụta mkpuchi dị gịrịgịrị ma dị oke mma nke na-esochi geometry ziri ezi nke eriri bolt, radius n'okpuru isi, na ihu flange. Ịdị n'otu a na-echekwa njikọ aka emebere eri ma na-enye ohere mmekọrịta torque-mkparịta ụka ziri ezi n'oge mgbakọ. Usoro ntinye-spin ngwa na-eme ka o doo anya na ọbụna geometries dị mgbagwoju anya, ebe a na-agbaji, na n'ime ime flange bolts na-enweta nchedo nchara zuru oke, na-ewepụ ntụpọ adịghị ike na-ejikọta ya na mkpuchi electroplated.

3.4 Nkwụsi ike dị elu yana ịdịte aka igwe

Ihe mkpuchi dacromet na-anọgide na-akwụsi ike na okpomọkụ ọrụ na-aga n'ihu ruo 300 ° C, na-agafe oke njedebe nke zinc plating (nke na-amalite imebi gburugburu 100-120 ° C). Nguzogide okpomọkụ a bara uru karịsịa maka bolts flange ndị a na-eji n'ime ụlọ engine, usoro ikpochapu ọkụ, ọkụ ụlọ ọrụ mmepụta ihe, na akụrụngwa mmepụta ike. Tụkwasị na nke ahụ, ihe nkiri Dacromet a gwọrọ na-egosipụta ezigbo nguzogide nbibi na-arụ ọrụ n'oge njikwa na ntinye, na-echekwa n'ihu ogologo oge corrosion na mgbochi nchara nke bolt.