Izindaba

I-hot dip galvanizing, eyaziwa nangokuthi i-hot dip galvanizing kanye ne-hot dip galvanizing, iyindlela ephumelelayo yokuvimbela ukugqwala kwensimbi, esetshenziselwa ikakhulukazi izakhiwo zensimbi nezinsiza ezimbonini ezihlukahlukene. Kuwukucwilisa izingxenye zensimbi ezincibilikisiwe ku-zinc encibilikisiwe cishe ku-500 ℃ ukuze kunamathele ungqimba lwezinc ebusweni bezingxenye zensimbi, ngaleyo ndlela kufezwe inhloso yokuvimbela ukugqwala. Ukugeleza kwenqubo yediphu elishisayo: ukucotshwa komkhiqizo ophelile - ukuwasha amanzi - ukwengeza isixazululo esisizayo sokucwenga - ukomisa - ukulenga ukucwenga - ukupholisa - ukwelapha - ukuhlanza - ukupholishwa - ukuphothulwa kokucwenga kwediphu elishisayo 1. Ukuvuthela kwediphu elishisayo kwenziwa ngendlela endala yokufaka idiphu elishisayo , futhi inomlando weminyaka engaphezu kwengu-170 kusukela iFrance yafaka i-hot dip galvanizing embonini 1836. Eminyakeni engamashumi amathathu edlule, ngokuthuthuka okusheshayo kwensimbi egoqiwe ebandayo, imboni ye-hot dip galvanizing ithuthuke ngezinga elikhulu.
I-hot dip galvanizing, eyaziwa nangokuthi i-hot dip galvanizing, iyindlela yokuthola ukunamathela kwensimbi ezingxenyeni zensimbi ngokuzicwilisa ku-zinc encibilikisiwe. Ngokuthuthuka okusheshayo kokudluliswa kwamandla kagesi aphezulu, ezokuthutha, kanye nokuxhumana, izidingo zokuvikela izingxenye zensimbi ziya ngokuya ziba phezulu, futhi nesidingo se-hot dip galvanizing siyanda.

Ukusebenza okuvikelayo
Ngokuvamile, ukushuba kongqimba lukathayela buyi-5 ~ 15 μ m. Ungqimba olunothayela lwediphu elishisayo ngokuvamile luba ku-35 μ Ngaphezulu kuka-m, ngisho nokufika ku-200 μ m. Ukucwebezela kwediphu elishisayo kunekhono elihle lokumboza, ukunamathela okuminyene, futhi akukho nokuhlanganisa okuphilayo. Kuyaziwa ukuthi izindlela zokumelana kwe-zinc nokugqwala kwe-atmospheric zihlanganisa ukuvikelwa kwemishini kanye nokuvikelwa kwe-electrochemical. Ngaphansi kwezimo zokugqwala komkhathi, ingaphezulu lesendlalelo se-zinc line-ZnO, Zn (OH) 2, namafilimu ayisisekelo e-zinc carbonate okuvikela, okuthi ngokwezinga elithile abambezele ukugqwala kwe-zinc. Uma le filimu evikelayo (eyaziwa nangokuthi ukugqwala okumhlophe) yonakaliswa, izokwakha ungqimba lwefilimu olusha. Lapho ungqimba lwe-zinc lonakaliswe kakhulu futhi lufaka engozini i-substrate yensimbi, i-zinc inikeza ukuvikelwa kwe-electrochemical ku-substrate. Amandla ajwayelekile e-zinc ngu-0.76V, futhi amandla ajwayelekile ensimbi ngu-0.44V. Lapho i-zinc ne-iron zakha ibhethri elincane, i-zinc iyancibilika njenge-anode, futhi insimbi ivikelekile njenge-cathode. Ngokusobala, ukumelana nokugqwala kwe-atmospheric of hot dip galvanizing on the base metal iron kungcono kunokwe-electrogalvanizing.
Inqubo yokwakhiwa kwe-Zinc coating
Inqubo yokwakheka kongqimba olunamanzi wediphu elishisayo iyinqubo yokwenza ingxubevange ye-zinc yensimbi phakathi kwe-iron substrate kanye nongqimba oluhlanzekile lwezinc ngaphandle kwe-Z. Ungqimba lwe-iron zinc alloy lwakhiwa phezu kwendawo yokusebenza ngesikhathi sokucwenga okushisayo, okuyinto ivumela inhlanganisela enhle phakathi kwensimbi kanye nongqimba oluhlanzekile lwe-zinc. Inqubo ingachazwa kanjena nje: Uma insimbi yokusebenza icwiliswa oketshezini lwezinki oluncibilikisiwe, i-zinc kanye ne-zinc kwakheka okokuqala kusixhumi esibonakalayo α Iron (umgogodla womzimba) ncibilika okuqinile. Lena ikristalu eyakhiwe ngokuncibilikisa ama-athomu e-zinc esimweni esiqinile sensimbi eyisisekelo. Ama-athomu amabili ensimbi ahlanganisiwe, futhi ukukhangana phakathi kwama-athomu kuncane kakhulu. Ngakho-ke, lapho i-zinc ifinyelela ekugcwalisweni ekuncibilikeni okuqinile, ama-athomu amabili ayisisekelo e-zinc nensimbi ayahlakazeka, futhi ama-athomu e-zinc ahlakazeka phakathi (noma angenele) ku-matrix yensimbi afuduke ku-matrix lattice, kancane kancane akhe ingxubevange ngensimbi. , kuyilapho insimbi ne-zinc kusakazeka oketshezini lwezinki oluncibilikisiwe ngensimbi enamandla amakhulu kwakha inhlanganisela ye-intermetallic I-FeZn13, eshona phansi ebhodweni elishisayo, yenze i-zinc slag. Lapho ucezu lokusebenzela lususwa kusisombululo sokucwilisa i-zinc, kwakheka ungqimba oluhlanzekile lwezinc phezulu, okuyikristalu eyi-hexagonal. Okuqukethwe kwe-iron akukukhulu kuno-0.003%.
Umehluko wezobuchwepheshe
Ukumelana nokugqwala kokuvuthwa okushisayo kuphezulu kakhulu kunokwe-galvanizing okubandayo (okubuye kwaziwe ngokuthi i-galvanization). I-galvanizing eshisayo ngeke igqwale eminyakeni embalwa, kanti ukugqwala okubandayo kuzogqwala ezinyangeni ezintathu.
Inqubo ye-electrogalvanizing isetshenziselwa ukuvikela izinsimbi ekugqwaleni. “Kuzoba nongqimba oluhle lokuvikela lwensimbi emaphethelweni nasezindaweni ezingaphezulu zomkhiqizo, okwengeza ingxenye enhle ekusebenzeni. Kulezi zinsuku, amabhizinisi amakhulu anezidingo eziphakeme kakhulu zezingxenye zomkhiqizo nobuchwepheshe, ngakho-ke kuyadingeka ukulungisa ubuchwepheshe kulesi sigaba. "