Dacromet Yakaputirwa Flange Bolts 

2. Kunzwisisa Dacromet Coating Technology

Dacromet imvura-yakavakirwa, isiri-electrolytic zinc-aluminium flake coating system yakanyatso kugadzirwa kune fasteners, kusanganisira yakakwirira-simba flange mabhaudhi. Kusiyana nemaitiro echinyakare e electroplating anoisa maion simbi kuburikidza nemagetsi, iyo Dacromet process inoshandisa yakanyatsogadzirwa slurry ine zinc flakes, aluminium flakes, uye inorganic binders pamusoro pebhaudhi. Mushure mekushandisa kuburikidza nedip-spin kana nzira dzekupfapfaidza, mabhaudhi akavharidzirwa anorapwa-yepamusoro-tembiricha (kazhinji inotenderedza 300°C), iyo inonyudza maflakes kuita firimu rakasungwa zvakasimba, rine mativi akawanda ekudzivirira.

Iyo inokonzeresa yeDacromet coating yakanyanya kutetepa-kazhinji iri pakati pe6 uye 12 micrometers-asi inopa yakasarudzika corrosion resistance. Iwo anopindirana zinc uye aluminium flakes anogadzira labyrinthine chipingamupinyi chinononotsa kupinda kwehunyoro, okisijeni, uye maion anoparadza. Panguva imwe chete, zinc inopa chibayiro (cathodic) dziviriro kune iri pasi pesimbi substrate yebhaudhi, nepo aruminiyamu uye chromate zvikamu zvinosimudzira passivation uye yakazara anti-ngura kusimba. Iyi yakawanda-mechanism yekudzivirira sisitimu ndechimwe chezvikonzero zvakakosha kuti Dacromet iite yakajairwa zinc plating uye kunyangwe inopisa-dip galvanizing mune yakawanda yakakwirisa corrosion bvunzo.

Zvinonyanya kukosha, nekuti iyo Dacromet process haibatanidzi kunhonga asidhi uye isina electrolytic deposition, inounza hapana hydrogen musimbi yesimbi yebhaudhi. Iyi yakakosha maitiro hunhu inoita kuti Dacromet yekupfekedza yakazara hydrogen embrittlement kusununguka-mubairo wakajeka kana uchipfekedza mabhaudhi egiredhi 10.9, 12.9, kana ASTM A490.

3. Mabhenefiti Akakosha eDacromet Flange Bolts

3.1 Kusarudzika Corrosion Resistance uye Anti-Rust Performance

Dacromet yakavharwa mabhaudhi eflange anogara achiwana anopfuura 1,000 maawa ekusarerekera munyu kupfapfaidza kuramba (ASTM B117 / ISO 9227) pasina kutaridzika kwemarara tsvuku. Mumagiredhi mazhinji ekutengeserana, ngura chena inononoka zvakare kupfuura maawa 240. Iyi nhanho yekurwisa ngura inopfuura nekure yeyakajairwa electroplated zinc coatings, iyo inowanzoratidza tsvuku ngura mukati meawa makumi manomwe nemaviri kusvika mazana maviri pasi pemamiriro ebvunzo akafanana. Iyo yepamusoro corrosion kuramba yeDacromet inobva kune yakasarudzika flake chimiro uye synergistic chiito chekudzivirira kwechivharo, chibayiro chekudzivirira zinc, uye makemikari passivation.

Munzvimbo chaidzo dzepasirese — mhepo yegungwa, maindasitiri emakemikari zvidyarwa, mota dzepasi, uye offshore mapuratifomu - Dacromet flange mabhaudhi anochengetedza kuvimbika kwavo kureba kupfuura zvisungo zvakajairwa. Iyo yekupfekedza inodzivirira zvinobudirira zvese zviri zviviri yunifomu corrosion uye pitting yenzvimbo, kuve nechokwadi chekuti bhaudhi rinoramba richipa yakavimbika clamping simba muhupenyu hwayo hwesevhisi. Iyi yakasarudzika yekudzivirira ngura inoshandura zvakananga mukuderedzwa kwemitengo yekugadzirisa, kushoma kuvharika kusina kurongeka, uye kusimbiswa kwekuchengetedzwa kwemaitiro.

3.2 Yakazara Hydrogen Embrittlement Yemahara

Imwe yeanonyanya kukosha mabhenefiti eDacromet coating yeflange mabhaudhi ndeyekuti inherently hydrogen embrittlement yemahara. Mabhaudhi esimbi ane simba akanyanya kukanganiswa nehydrogen embrittlement, chiitiko umo atomic hydrogen inopararira musimbi microstructure, inoderedza ductility, uye inogona kukonzera kamwe kamwe, kunonoka kuputsika pasi pekunetseka kwekunetseka. Tsika dzechinyakare dze electroplating dzinoburitsa haidrojeni pane cathode panguva yekuiswa kwesimbi, uye kunyangwe kunyatsobika mushure mekuputira hakugone kugara ichivimbisa kubviswa kwehydrogen.

Nekuti Dacromet isiri-electrolytic coating inoiswa isina acid pretreatment, hapana hydrogen inounzwa mubhaudhi panguva yekupedzisa. Kunozotevera kwepamusoro-tembiricha kurapa kunoenderera mberi kunovimbisa kuti chero hunyoro hwasara hunodzingwa. Kuongororwa kwakadzama kwekuyedzwa-kusanganisira zvidzidzo zvinotsigira kugamuchirwa kweDacromet yeASTM A490 mabhaudhi echimiro-yakasimbisa kuti Dacromet yakavharwa mabhaudhi akasimba-akasimba anochengeta simba rawo rakazara rekutyoka kunyangwe mushure mekuratidzwa kwenguva refu kunzvimbo dzinoparadza. Iyi hydrogen embrittlement yemahara hunhu inoita kuti Dacromet iyo yekuvharisa yesarudzo yakakosha yekubatanidza flange mumhepo turbines, mabhiriji, midziyo yekumanikidza, uye mota chassis application.

3.3 Yakatetepa, Yakafanana Coating ine Yakanakisa Coverage

Kusiyana nekupisa-dip galvanizing, iyo inoisa iyo yakakora uye dzimwe nguva isina kuenzana zinc layer, Dacromet inogadzira yakatetepa, yakanyatso yunifomu yakapetwa iyo inotevera iyo chaiyo geometry yetambo dzebhaudhi, pasi-musoro radius, uye flange kumeso. Kufanana uku kunochengetedza tambo yakagadzirwa uye inobvumira hukama hwe torque-tension panguva yekusangana. Iyo dip-spin application nzira inova nechokwadi chekuti kunyangwe yakaoma geometries, nzvimbo dzakadzoserwa, uye mukati meiyo flange mabhaudhi inogashira yakakwana yekudzivirira ngura, kubvisa nzvimbo dzisina kusimba dzinowanzobatanidzwa nemagetsi emagetsi.

3.4 High-Temperature Kugadzikana uye Mechanical Durability

Dacromet coating inoramba yakatsiga pakuenderera kwesevhisi tembiricha inosvika 300 ° C, ichipfuura zvakanyanya muganho unoshanda weyakajairwa zinc plating (iyo inotanga kuderera kutenderedza 100-120 ° C). Uku kupikisa kupisa kunonyanya kukosha kune mabhaudhi eflange anoshandiswa mumakamuri einjini, masisitimu emhepo, mavira emaindasitiri, uye michina yekugadzira magetsi. Mukuwedzera, iyo yakarapwa yeDacromet firimu inoratidzira kupikisa kwakanaka kune kukuvara kwemagetsi panguva yekubata nekuisa, ichiwedzera kuchengetedza kwenguva yakareba corrosion uye anti-rust performance yebhoti.