I-Dacromet Coated Flange Bolts 

2. Ukuqonda I-Dacromet Coating Technology

I-Dacromet iwuhlelo lokumboza lwe-zinc-aluminium olusekelwe emanzini olungasebenzisi i-electrolytic oluklanyelwe ngokukhethekile izinsimbi, okuhlanganisa namabhawudi e-flange anamandla aphezulu. Ngokungafani nezinqubo ze-electroplating ezivamile ezifaka ama-ion ensimbi ngamandla kagesi, inqubo ye-Dacromet isebenzisa udaka oluklanywe ngokucophelela oluqukethe ama-zinc flakes, ama-aluminium flakes, nezibophezelo ze-inorganic phezu kwebhawodi. Ngemva kokufakwa ngokusebenzisa i-dip-spin noma izindlela zokufutha, amabhawodi amboziwe enziwa ukwelashwa ngezinga lokushisa eliphezulu (imvamisa cishe ku-300°C), okwenza ama-flakes abe yifilimu yokuvikela eboshwe ngokuqinile, enezendlalelo eziningi.

Umphumela we-Dacromet coating mncane kakhulu-imvamisa phakathi kwama-micrometer ayi-6 no-12-kodwa uletha ukumelana nokugqwala okuvelele. I-zinc ne-aluminium flakes egqagqene kudala umgoqo we-labyrinthine obambezela ngokuphawulekayo ukungena komswakama, umoya-mpilo, nama-ion abolayo. Ngesikhathi esifanayo, i-zinc inikeza isivikelo somhlatshelo (i-cathodic) ku-substrate yensimbi engaphansi yebhawudi, kuyilapho i-aluminium nezingxenye zekhromate zithuthukisa ukuphefumula kanye nokuqina kukonke okulwa nokugqwala. Lolu hlelo lokuvikela olusebenzisa izindlela eziningi lungesinye sezizathu ezibalulekile ezenza i-Dacromet iphumelele ukudlula i-zinc plating evamile ngisho nokufaka i-hot-dip galvanizing ekuhlolweni okuningi kokugqwala okusheshisiwe.

Okubalulekile, ngoba inqubo ye-Dacromet ayihlanganisi ukuchotshozwa kwe-asidi futhi ayikho i-electrolytic deposition, yethula i-hydrogen ku-lattice yensimbi yebhawodi. Lesi sici senqubo eyisisekelo senza i-Dacromet enamathelayo ye-hydrogen ikhululeke ngokuphelele—inzuzo ewujuqu lapho imboza amabhawodi aqinile ebanga le-10.9, 12.9, noma i-ASTM A490.

3. Izinzuzo ezibalulekile ze-Dacromet Flange Bolts

3.1 Ukumelana Nokugqwala Okukhethekile kanye Nokusebenza Okumelene Nokugqwala

I-Dacromet coated flange bolts ifinyelela ngokuqhubekayo amahora angaphezu kwe-1,000 wokumelana nokungathathi hlangothi kwesifutho sikasawoti (ASTM B117 / ISO 9227) ngaphandle kokubonakala kokugqwala okubomvu. Emabangeni amaningi okuhweba, ukugqwala okumhlophe nakho kubambezeleka ngaphezu kwamahora angama-240. Leli zinga le-anti-rust liyidlula kude leyo ye-electroplated zinc coatings, ngokuvamile ebonisa ukugqwala okubomvu phakathi kwamahora angu-72 kuya kwangu-200 ngaphansi kwezimo ezifanayo zokuhlola. Ukumelana nokugqwala okuphakeme kwe-Dacromet kuvela ekwakhekeni kwayo okuhlukile kwe-flake kanye nesenzo sokusebenzisana sokuvikela isithiyo, ukuvikelwa kwe-zinc yomhlatshelo, kanye nokudlula kwamakhemikhali.

Ezimweni zomhlaba wangempela—umkhathi wasogwini, izitshalo zamakhemikhali ezimbonini, izindawo ezingaphansi kwezimoto, namapulatifomu asogwini—amabhawodi e-Dacromet flange agcina ubuqotho bawo isikhathi eside kunezibophelelo ezimbozwe ngendlela evamile. I-coating ivimbela ngempumelelo kokubili ukugqwala okufanayo kanye ne-pitting yendawo, iqinisekisa ukuthi ibhawudi liyaqhubeka nokuhlinzeka ngamandla okubamba athembekile kuyo yonke impilo yayo yesevisi. Leli khono elivelele lokulwa nokugqwala lihumusha ngokuqondile izindleko zokulungisa ezincishisiwe, ukuvalwa okungahleliwe okumbalwa, kanye nokuphepha kwesakhiwo okuthuthukisiwe.

3.2 I-Hydrogen Embrittlement Free ngokuphelele

Enye yezinzuzo ezibaluleke kakhulu zokugcotshwa kwe-Dacromet kumabhawodi we-flange ukuthi ngokwemvelo ayinayo i-hydrogen embrittlement. Amabhawodi ensimbi anamandla aphezulu angenwa kalula yi-hydrogen embrittlement, okuyisimanga lapho i-athomu ye-hydrogen isakazeka ku-microstructure yensimbi, inciphise ukudumba, futhi ingabangela ukuphuka okungazelelwe, ukubambezeleka ngaphansi kwengcindezi eqinile. Izinqubo zendabuko ze-electroplating zikhiqiza i-hydrogen ku-cathode ngesikhathi sokufakwa kwensimbi, futhi ngisho nokubhaka okuphelele ngemva kokucwenga akukwazi njalo ukuqinisekisa ukususwa okuphelele kwe-hydrogen.

Ngenxa yokuthi i-Dacromet iyi-non-electrolytic coating esetshenziswa ngaphandle kwe-acid pretreatment, ayikho i-hydrogen efakwa emshudoni ngesikhathi sokuqeda. Ukuphulukiswa kwezinga lokushisa okuphezulu okulandelayo kuqinisekisa ukuthi noma yimuphi umswakama osele uyaxoshwa. Ukuhlolwa okubanzi kweziqu—okuhlanganisa nezifundo ezisekela ukwamukelwa kwe-Dacromet yamabhawodi esakhiwo se-ASTM A490—kuqinisekisile ukuthi i-Dacromet enamabhawodi anamandla amakhulu igcina amandla awo okuphuka aphelele ngisho nangemva kokuchayeka isikhathi eside ezindaweni ezigqwalayo. Lesi sici samahhala se-hydrogen embrittlement senza i-Dacromet ibe uqweqwe olukhethwayo lokuxhumana okubalulekile kwe-flange kuma-turbine omoya, amabhuloho, imishini yokucindezela, nezinhlelo zokusebenza ze-chassis yezimoto.

3.3 Okuzacile, Okufana Okufanayo Okuhlanganisayo Okuhle Kakhulu

Ngokungafani ne-hot-dip galvanizing, ebeka ungqimba lwezinki oluwugqinsi futhi ngezinye izikhathi olungalingani, i-Dacromet ikhiqiza uqweqwe oluncane, olufana kakhulu olulandela i-geometry enembile yemicu yebhawudi, irediyasi engaphansi kwekhanda, kanye nobuso be-flange. Lokhu kufana kulondoloza ukubandakanyeka kwentambo okuklanyelwe futhi kuvumela ubudlelwano obunembile be-torque-tension ngesikhathi sokuhlanganisa. Indlela yesicelo se-dip-spin iqinisekisa ukuthi ngisho namajiyometri ayinkimbinkimbi, izindawo ezihlehlisiwe, nezindawo zangaphakathi zamabhawodi e-flange zithola ukuvikeleka okuphelele kokuqeda ukugqwala, okuqeda izindawo ezibuthakathaka ezivame ukuhlotshaniswa nama-electroplated coatings.

3.4 Ukuzinza Kwezinga Eliphezulu Nokuqina Komshini

Ukufakwa kwe-Dacromet kuhlala kuzinzile emazingeni okushisa aqhubekayo afinyelela ku-300 ° C, okwedlula kude umkhawulo osebenzayo wokucwecwa kwe-zinc okuvamile (okuqala ukwehla cishe ku-100-120 ° C). Lokhu kumelana nokushisa kubaluleke kakhulu kumabhawodi e-flange asetshenziswa emagumbini enjini, izinhlelo zokukhipha umoya, iziko lezimboni, kanye nemishini yokukhiqiza amandla. Ukwengeza, ifilimu ye-Dacromet ephulukisiwe ibonisa ukumelana okuhle nokulimala komshini ngesikhathi sokuphatha nokufakwa, ngokuqhubekayo ukulondoloza ukugqwala kwesikhathi eside nokusebenza okulwa nokugqwala kwe-bolt.