Iindaba

I-Hot dip galvanizing, ekwabizwa ngokuba yi-hot dip galvanizing kunye ne-hot dip galvanizing, yindlela esebenzayo yokuthintela ukuhlwa kwesinyithi, esetyenziswa ikakhulu kwizakhiwo zentsimbi kunye nezibonelelo kumashishini ahlukeneyo. Kukuntywilisela iinxalenye zentsimbi echithiweyo kwi-zinc etyhidiweyo malunga ne-500 ℃ ukubambelela umaleko we-zinc kumphezulu wamacandelo ensimbi, ngaloo ndlela ufezekise injongo yokuthintela ukubola. Ukuqukuqela kwenkqubo yediphu eshushu yokugalela: ukucholwa kwemveliso egqityiweyo - ukuhlamba amanzi - ukongeza isisombululo esincedisayo sokutya - ukomisa - ukuxhoma iplating - ukupholisa - ukunyanga - ukucoca - ukugulisa - ukugqitywa kwediphu eshushu yokufaka igalvanizing , kwaye inembali engaphezulu kweminyaka eyi-170 ukusukela oko iFransi yafaka idiphu eshushu kwishishini 1836. Kwiminyaka engamashumi amathathu edlulileyo, kunye nophuhliso olukhawulezayo lwentsimbi epholileyo eqengqelekayo, imboni yokudibanisa idiphu eshushu iye yaphuhliswa kwinqanaba elikhulu.
I-Hot dip galvanizing, ekwabizwa ngokuba yi-hot dip galvanizing, yindlela yokufumana intsimbi yokugquma kumalungu entsimbi ngokuntywiliselwa kwi-zinc etyhidiweyo. Ngophuhliso olukhawulezayo lokuhanjiswa kwamandla ombane aphezulu, uthutho, kunye nonxibelelwano, iimfuno zokukhuselwa kwamalungu entsimbi ziya zisanda, kwaye imfuno ye-galvanizing yediphu eshushu iyanda.

Ukusebenza okukhuselekileyo
Ngokuqhelekileyo, ubukhulu bomgca we-galvanized yi-5 ~ 15 μ m. Umaleko oshushu-diphu owenziwe ngamazingile uqhele ukuba yi-35 μ Ngaphezulu kwe-m, nokuya kuthi ga kwi-200 μ m. Idiphu eshushu yokufaka igalvanizing inamandla okugquma, ukugquma okuxineneyo, kwaye akukho ziqukethwe eziphilayo. Kuyaziwa ukuba iindlela zokumelana ne-zinc kwi-corrosion ye-atmospheric ziquka ukukhuselwa komatshini kunye nokukhuselwa kwe-electrochemical. Ngaphantsi kweemeko ze-atmospheric corrosion, umphezulu we-zinc layer ine-ZnO, i-Zn (OH) 2, kunye ne-basic zinc carbonate films protective films, ethi kwinqanaba elithile licothise ukubola kwe-zinc. Ukuba le filimu yokukhusela (eyaziwa ngokuba yi-white rust) yonakele, iya kwenza ifilimu entsha. Xa i-zinc layer yonakaliswe kakhulu kwaye ibeka engozini i-iron substrate, i-zinc inika ukhuseleko lwe-electrochemical kwi-substrate. Umgangatho osemgangathweni we-zinc ngu-0.76V, kwaye umgangatho osemgangathweni wentsimbi ngu-0.44V. Xa i-zinc kunye nentsimbi zenza ibhetri encinci, i-zinc iyachithwa njenge-anode, kwaye intsimbi ikhuselwe njenge-cathode. Ngokucacileyo, ukuxhathisa kwi-atmospheric corrosion of hot dip galvanizing kwisiseko sentsimbi yentsimbi ingcono kuneyo ye-electrogalvanizing.
Inkqubo yokuqulunqa i-Zinc coating
Inkqubo yokwakhiwa kwediphu eshushu yomaleko yinkqubo yokwenza ingxubevange yentsimbi ye-zinc phakathi kwe-iron substrate kunye ne-zinc ecocekileyo yomaleko ngaphandle kwe-Z. I-iron zinc alloy layer yenziwa kumphezulu we-workpiece ngexesha lokufakwa kwediphu eshushu. ivumela ukudibanisa okulungileyo phakathi kwentsimbi kunye ne-zinc layer ecocekileyo. Inkqubo inokuchazwa ngokulula ngolu hlobo lulandelayo: Xa i-workpiece yentsimbi intywiliselwa kulwelo lwezinki olunyibilikisiweyo, i-zinc kunye nezinc zenziwa kuqala kujongano α Iron (undoqo womzimba) unyibilike oqinileyo. Le yikristale eyenziwe ngokunyibilikisa iiathom ze-zinc kwindawo eqinileyo yesiseko sesinyithi. Iiathom ezimbini zesinyithi zixutywe, kwaye umtsalane phakathi kweeathom umncinci. Ke ngoko, xa i-zinc ifikelela ekuzalisekeni kwinyibilika eqinileyo, iiathom ezimbini ze-zinc kunye nentsimbi ziyasasazeka enye kwenye, kwaye iiathom ze-zinc zisasazeke phakathi (okanye zingene ngaphakathi) kwimatrix yentsimbi ifuduka kwileti ye-matrix, ngokuthe ngcembe yenze ialloyi ngentsimbi. , ngelixa i-iron kunye ne-zinc zisasazwa kwi-zinc etyhidiweyo yolwelo olutyhidiweyo yintsimbi ephezulu yamandla yenza i-intermetallic compound. I-FeZn13, etshona ezantsi kwembiza eshushu yegalvanizing, yenze i-zinc slag. Xa i-workpiece isusiwe kwisisombululo se-zinc, i-zinc ecocekileyo yenziwa phezu komhlaba, eyi-crystal ene-hexagonal. Umxholo wayo wentsimbi awukho ngaphezu kwe-0.003%.
Ukwahluka kobugcisa
Ukunganyangeki komhlwa kokugalela okushushu kuphezulu kakhulu kunoko kubanda kwegalvanizing (ekwaziwa ngokuba yigalvanization). I-galvanizing eshushu ayiyi kuhlwa kwiminyaka embalwa, ngelixa i-galvanizing ebandayo iya kuhlwa kwiinyanga ezintathu.
Inkqubo ye-electrogalvanizing isetyenziselwa ukukhusela isinyithi kwi-corrosion. "Kuya kubakho umaleko okhuselayo wentsimbi emaphethelweni kunye nomphezulu wemveliso, owongeza indawo entle ekusebenzeni. Kule mihla, amashishini amakhulu aneemfuno eziphakamileyo zecandelo lemveliso kunye netekhnoloji, ngoko ke kuyimfuneko ukuguqula itekhnoloji okwangoku. ”