I-Dacromet Coated Flange Bolts 

2. Ukuqonda iTekhnoloji yokuCoating yeDacromet

I-Dacromet yinkqubo ye-coating ye-zinc-aluminiyam ye-aluminiyam esekelwe emanzini, engeyiyo i-electrolytic, eyenzelwe ngokukodwa i-fasteners, kubandakanywa iibholiti ze-flange eziphezulu. Ngokungafaniyo neenkqubo ze-electroplating zemveli ezifaka i-ion zetsimbi ngokusebenzisa umsinga wombane, inkqubo yeDacromet isebenzisa uludaka olucwangcisiweyo olunezinki, iiflakes ze-aluminium, kunye nezibophelelo ezingaphili kumphezulu webholiti. Emva kokufakwa kwe-dip-spin okanye iindlela zokutshiza, iibholiti ezigqunyiweyo zinyangwa kubushushu obuphezulu (ngokuqhelekileyo malunga ne-300°C), ezitshisa iiflakes zibe yifilim ekhuselweyo ebotshelelwe ngokuqinileyo, enamaleko amaninzi.

Isiphumo sokugquma kwe-Dacromet sincinci kakhulu-ngokuqhelekileyo phakathi kwe-6 kunye ne-12 micrometers-kodwa sinikezela ukuxhathisa okugqwesileyo. Iiflake ze-zinc kunye ne-aluminiyam ezigqwesileyo zidala umqobo we-labyrinthine ocothisa kakhulu ukungena kokufuma, ioksijini, kunye neeyoni ezidlayo. Kwangaxeshanye, i-zinc ibonelela ngokhuseleko lombingelelo (i-cathodic) kwi-substrate yentsimbi ephantsi yebholiti, ngelixa i-aluminiyam kunye nezixhobo zechromate ziphucula i-passivation kunye ne-anti-rust durability jikelele. Le nkqubo yokhuseleko yeendlela ezininzi sesinye sezizathu eziphambili zokuba i-Dacromet igqwese i-zinc plating eqhelekileyo kunye ne-hot-dip galvanizing kwiimvavanyo ezininzi ezikhawulezayo zokubola.

Okubalulekileyo, kuba inkqubo yeDacromet ayibandakanyi ukucholwa kweasidi kwaye akukho kubekwa kwe-electrolytic, yazisa ukuba akukho hydrogen kwileti yentsimbi yebholiti. Olu phawu lwenkqubo olusisiseko lwenza iDacromet yokwambathisa i-hydrogen imbrittlement ikhululeke-inzuzo eqinisekileyo xa ugquma iibholiti zebanga le-10.9, 12.9, okanye ASTM A490.

3. Izinto eziluncedo eziphambili zeDacromet Flange Bolts

3.1 Ukuxhathisa okugqwesileyo kokuRhakala kunye neNtsebenzo echasene neRust

I-Dacromet coated flange bolts ifikelela ngokuqhubekayo ngaphezu kweeyure ze-1,000 zokumelana nokutshiza kwetyuwa engathathi hlangothi (ASTM B117 / ISO 9227) ngaphandle kokubonakala komhlwa obomvu. Kumabanga amaninzi ezorhwebo, umhlwa omhlophe nawo ulibaziseke ngaphaya kweeyure ezingama-240. Eli nqanaba lentsebenzo yokuchasana nomhlwa ligqithise kakhulu elo leengubo ze-zinc ze-electroplated eziqhelekileyo, ezibonisa umhlwa obomvu kwiiyure ezingama-72 ukuya kwezingama-200 phantsi kweemeko ezifanayo zovavanyo. Ukuxhatshazwa okuphezulu kwe-corrosion ye-Dacromet kuvela kwisakhiwo sayo esiyingqayizivele se-flake kunye nesenzo sokubambisana sokukhusela umqobo, ukukhuselwa kwe-zinc yedini, kunye nokugqithiswa kweekhemikhali.

Kwiimeko zehlabathi zokwenyani-imozulu engaselunxwemeni, izityalo zemichiza yemizi-mveliso, iimoto zangaphantsi, kunye namaqonga angaphesheya kolwandle-iibholiti ze-Dacromet flange zigcina ingqibelelo yazo ixesha elide kuneziqhoboshi ezigqunywe ngokwesiqhelo. I-coating ikhusela ngokufanelekileyo ukubola okufanayo kunye ne-pitting yendawo, iqinisekisa ukuba ibholithi iyaqhubeka nokubonelela ngamandla okubamba okuthembekileyo kubo bonke ubomi bayo benkonzo. Esi sixhobo sibalaseleyo sokuchasa umhlwa siguqulela ngokuthe ngqo kwiindleko zokulungisa ezicuthiweyo, ukuvalwa okumbalwa okungacwangciswanga, kunye nokhuseleko oluphuculweyo lwesakhiwo.

3.2 I-Hydrogen Embrittlement ngokupheleleyo yamahala

Olunye lolona ncedo lubalulekileyo lweDacromet yokugquma iibholiti zeflange kukuba ngokwemvelo i-hydrogen embrittlement simahla. Iibholiti zetsimbi eziphakamileyo zichaphazeleka ngokukodwa kwi-hydrogen embrittlement, into eyenzekayo apho i-athomu ye-athomu isasazeka kwi-microstructure yensimbi, iyanciphisa i-ductility, kwaye ingabangela ukuphuka ngokukhawuleza, ukulibaziseka phantsi koxinzelelo lwe-tensile. Iinkqubo zemveli zokufakwa kwe-electroplating zivelisa i-hydrogen kwi-cathode ngexesha lokubekwa kwesinyithi, kwaye nokubhaka okucokisekileyo emva kokutyalwa akunakusoloko kuqinisekisa ukususwa kwe-hydrogen ngokupheleleyo.

Ngenxa yokuba i-Dacromet i-coating non-electrolytic ifakwe ngaphandle kwe-acid pretreatment, akukho hydrogen ingeniswa kwi-bolt ngexesha lokugqiba. Ukunyangwa kobushushu obuphezulu obulandelayo kuqinisekisa ngakumbi ukuba nakuphi na ukufuma okushiyekileyo kuyakhutshelwa ngaphandle. Uvavanyo olubanzi lwesiqinisekiso-kubandakanywa nezifundo ezixhasa ukwamkelwa kwe-Dacromet ye-ASTM A490 iibholiti zesakhiwo-luye lwaqinisekisa ukuba i-Dacromet coated high-high-high bolts igcina amandla abo okuqhekeka ngokupheleleyo nasemva kokuvezwa ixesha elide kwiindawo ezinobungozi. Olu phawu lwe-hydrogen embrittlement lwasimahla lwenza i-Dacromet ibe yingubo yokhetho yoqhagamshelo olubalulekileyo lwe-flange kwiiinjini zomoya, iibhulorho, izixhobo zoxinzelelo, kunye nokusetyenziswa kwe-chassis yeemoto.

3.3 Ibhityile, iUniform Coating enoMgqumo oGqwesileyo

Ngokungafaniyo ne-hot-dip galvanizing, ebeka i-zinc layer engqindilili kwaye ngamanye amaxesha engalinganiyo, i-Dacromet ivelisa i-coat ebhityileyo, efana kakhulu elandela ijometri echanekileyo ye-bolt thread, i-radius engaphantsi kwentloko, kunye nobuso be-flange. Oku kufana kugcina ukudityaniswa kwentambo eyiliweyo kwaye ivumela ubudlelwane obuchanekileyo be-torque-tension ngexesha lokuhlanganisa. Indlela yesicelo se-dip-spin iqinisekisa ukuba iijiyometri ezintsonkothileyo, iindawo ezirhoxiweyo, kunye nomphezulu wangaphakathi weebholithi zeflange zifumana ukhuseleko olupheleleyo lokuchasa umhlwa, ukuphelisa iindawo ezibuthathaka ezidla ngokunxulunyaniswa neengubo ezifakwe i-electroplated.

3.4 Uzinzo lobushushu obuphezulu kunye nokuZinzo koomatshini

I-Dacromet coating ihlala izinzile kubushushu benkonzo eqhubekayo ukuya kuma-300 ° C, idlula kakhulu umda osebenzayo we-zinc plating yesiqhelo (eqala ukuthotywa malunga ne-100-120 ° C). Oku kuxhathisa ubushushu kubaluleke kakhulu kwiibholiti ze-flange ezisetyenziswa kwiikhompatimenti ze-injini, iinkqubo zokukhupha, iziko loshishino, kunye nezixhobo zokuvelisa amandla. Ukongezelela, ifilimu ye-Dacromet ephilisiweyo ibonisa ukuchasana okulungileyo kumonakalo womatshini ngexesha lokuphatha kunye nokufakwa, ngokuqhubekayo ukugcinwa kwe-corrosion yexesha elide kunye ne-anti-rust performance ye-bolt.