Dacromet Bolts: Nchekwa nrụrụ dị elu na mgbochi nchara maka injinia ọgbara ọhụrụ 

2. Ịghọta teknụzụ mkpuchi mkpuchi Dacromet

2.1 Nhazi na nhazi

Dacromet bụ ihe mkpuchi nke zinc-flake nke emebere ya maka nchebe corrosion dị elu. Ihe mkpuchi ahụ nwere zinc microscopic na aluminom flakes kwụsịrị na matrix inorganic binder matrix, na-adaberekarị na chromium oxides ma ọ bụ ogige ndị yiri ya. Mgbe etinyere ya na bolt ma mechaa gwọọ ya site na usoro ịsa achịcha a na-achịkwa, flakes ndị a na-adakọ n'ọtụtụ ọkwa, na-akpụ nnukwu mgbochi lamellar nke na-egbochi nbanye nke mgbasa ozi na-emebi emebi dị ka mmiri, oxygen, na ion chloride.

Ọkpụrụkpụ ihe nkiri a na-ahụkarị nke mkpuchi Dacromet na bolt sitere na ihe dịka 5 ruo 15 micrometer. N'agbanyeghị profaịlụ a dị ntakịrị ntakịrị, nhazi multilayered na-enye ihe mgbochi pụrụ iche. Flakes zinc na-eme ihe n'ịchụ-aja, ọkachamma na-emebi emebi iji chebe mkpụrụ nchara, ebe ihe ndị aluminom na-eme ka nkwụsi ike zuru oke na njirimara ngafe. Usoro a na-eme ihe abụọ bụ isi maka nchebe corrosion pụtara ìhè na mgbochi nchara nke na-amata ọdịiche Dacromet bolts na ihe mkpuchi mkpuchi.

2.2 Usoro Ngwa

Usoro mkpuchi Dacromet na-amalite site na nkwadebe elu nke ọma nke bolt iji hụ na adhesion kacha mma. A na-etinyezi ihe nkedo dị ọcha n'ime ma ọ bụ fesa ya na slurry zinc-aluminom dabere na mmiri. Mgbe etinyere ya, ihe mkpuchi mkpuchi ahụ na-enweta usoro ọgwụgwọ ejiri nlezianya na-achịkwa na okpomọkụ dị elu. N'oge ọgwụgwọ okpomọkụ a, inorganic binder crosslinks na metallic flakes sinter n'ime ihe nkiri na-aga n'ihu, nke na-enye nchebe corrosion na-adịgide adịgide.

Otu n'ime uru kachasị dị ịrịba ama nke usoro Dacromet maka bolts bụ enweghị nchịkọta acid na-eme ihe ike n'ọtụtụ usoro dị iche iche. Omenala electroplating na-achọkarị ihicha acid siri ike, nke nwere ike iwebata hydrogen n'ime nchara siri ike ma mee ka hydrogen embrittlement. Site na ibelata ma ọ bụ wepụ ihe egwu a, mkpuchi Dacromet na-echekwa iguzosi ike n'ezi ihe nke bolts dị elu ka ọ na-ebuga nchebe corrosion pụtara ìhè na mgbochi nchara ogologo oge.

3. Nchekwa corrosion na arụ ọrụ mgbochi nchara

3.1 Laboratory arụmọrụ

A na-agụkarị ikike nchebe corrosion nke bolts Dacromet site na nnwale ịgba nnu na-anọpụ iche dabere na ụkpụrụ ASTM B117 ma ọ bụ ISO 9227. Ihe mkpuchi Dacromet dị elu na-enwetakarị 720 ruo ihe karịrị 1,000 awa nke ikpughe tupu nchara na-acha uhie uhie apụta n'elu bolt. N'ọtụtụ usoro dị elu nke na-etinye ihe mkpuchi ọzọ ma ọ bụ uwe elu, arụmọrụ nwere ike gafere 1,500 ma ọ bụ ọbụna 2,000 awa. Ọkwa mgbochi nchara a karịrị nnọọ zinc electroplating na-emekarị ma na-egosipụtakarị galvanizing na-ekpo ọkụ ọdịnala n'okpuru ọnọdụ ule yiri ya.

Na agafe nnwale ịgba nnu static, bolts Dacromet na-egosipụta nguzogide dị oke mma na nnwale corrosion cyclic nke na-emekọ ihe n'ezie n'ezie. Usoro ndị a na-agụnye oge ngbanwe nke nnu nnu, iru mmiri, na ihicha, na-agbagha ikike mkpuchi ahụ iji nọgide na-echebe ihe mgbochi. Ọdịdị zinc-aluminom dị larịị nke Dacromet na-anabata nke ọma na ọnọdụ dị ike dị otú ahụ, na-ejigide nchebe corrosion a pụrụ ịdabere na ya ọbụna mgbe ogologo oge na-eme ihe ike.

3.2 Usoro nchekwa

Nchedo corrosion kacha elu nke Dacromet bolts na-ebute site na ọtụtụ usoro synergistic. Nke mbụ, ihe mgbochi anụ ahụ nke flakes ọla na-ekpuchi ekpuchi mebere na-egbochi mgbasa nke mmiri, oxygen, na ion chloride n'ebe nchara nchara. Nke abụọ, omume ịchụ àjà nke zinc flakes na-enye nchebe cathodic na nkwụsịtụ microscopic ọ bụla na mkpuchi. Nke atọ, imepụta ngwaahịa corrosion kwụsiri ike na ihe nkiri passivation na-eme ka mgbochi nchara na-adịte aka site na ịchichi ụzọ ndị nwere ike ịwakpo ọzọ. Atụmatụ nchekwa nke nwere ọtụtụ ihe na-enye ohere bolts nwere mkpuchi Dacromet iji nọgide na-eguzosi ike n'ezi ihe na ọdịdị ogologo oge karịa ihe nkedo anaghị agwọ ọrịa ma ọ bụ nke a na-ekpuchi ya.

4. Isi uru nke Dacromet Bolts

Nnwere onwe pụọ na mgbami hydrogen: Mgbochi ike dị elu, ọkachasị ndị nke klas 10.9 na 12.9, na-enwe ike imebi hydrogen mgbe etinyere ya na usoro electroplating ọdịnala. Ntinye nke hydrogen atomiki n'oge a na-ehicha acid ma ọ bụ ntinye electrolytic nwere ike ibute mgbaji na-egbu oge n'okpuru ibu tensile. Teknụzụ mkpuchi dacromet na-ewepụ nchegbu a n'ụzọ dị ukwuu n'ihi na usoro ahụ anaghị agụnye ọgbọ hydrogen electrolytic ma na-ezere pretreatment acid siri ike. N'ihi nke a, ndị injinia nwere ike ịkọwapụta bolts Dacromet dị elu na ntụkwasị obi na nchebe corrosion agaghị emebi ntụkwasị obi igwe ma ọ bụ nchekwa.

Mkpuchi mkpuchi nke dị gịrịgịrị, Uniform, na akụkụ kwụsiri ike: N'adịghị ka galvanizing na-ekpo ọkụ na-ekpo ọkụ, nke nwere ike idobe akwa akwa zinc na-enweghị isi na mgbe ụfọdụ nke na-egbochi eriri eri na mmekọrịta erughị ala, mkpuchi Dacromet bụ nke dị nro ma dị oke mma. Ọkpụrụkpụ ihe nkiri 5–15µm a na-ahụkarị na-eme ka o doo anya na nkwado bolt na nut ga-adakọrịrị na-enweghị mkpa mkpụrụ pụrụ iche buru ibu ma ọ bụ mbelata eri. Nkwụsi ike nke akụkụ a bara uru karịsịa na mgbakọ ziri ezi yana arụ ọrụ mmegide na-akpaghị aka ebe ibu njide na-agbanwe agbanwe dị mkpa.

Ezigbo Nguzogide Okpomọkụ yana nkwụsi ike kemịkalụ: Ihe mkpuchi dacromet na-egosipụta nkwụsi ike dị ịrịba ama, na-ejigide nchebe corrosion dị irè na mgbochi nchara na okpomọkụ ọrụ na-aga n'ihu ruo ihe dịka 250-300 Celsius, dabere na nhazi ahụ. Nguzogide okpomọkụ a na-eme ka bolts Dacromet dabara maka ngwa dị nso na engines, sistemu iyuzucha, oven ụlọ ọrụ mmepụta ihe, na ebe ndị ọzọ na-ekpo ọkụ dị elu ebe mkpuchi organic ga-emebi. Na mgbakwunye, ọdịdị inorganic nke mkpuchi mkpuchi na-enye ezigbo nguzogide kemịkalụ ụlọ ọrụ dị iche iche.

Esemokwu a na-achịkwa na arụmọrụ mgbakọ: Ọtụtụ sistemu Dacromet na-etinye ihe mkpuchi pụrụ iche ma ọ bụ mmanụ mmanu nke na-enye ohere njikwa ziri ezi na ọnụọgụ nke esemokwu. Njirimara a dị oke mkpa maka ị nweta ebugo na-aga n'ihu na nkwonkwo kpọchiri akpọchi. Site n'inye omume torque-tension a pụrụ ịkọ amụma, bolts Dacromet na-akwado usoro mgbakọ a pụrụ ịdabere na ya ma belata ihe ize ndụ nke imechi ma ọ bụ karịa. Nchikota nke nchedo corrosion magburu onwe ya, njirimara esemokwu kwụsiri ike, na nnwere onwe pụọ na ọnọdụ embrittlement hydrogen Dacromet dị ka ọgwụgwọ elu elu masịrị maka nchekwa-dị oke mkpa na ihe nrụnye dị elu.