Ngokuthuthuka okusheshayo komnotho wezenhlalo, isikhala esikhulu solwandle kanye nezinsizakusebenza zasolwandle ezicebile seziqalile ukungena emkhakheni wombono wabantu. Ulwandle luyindlu enkulu yengcebo, ecebile ngezinsizakusebenza zezinto eziphilayo, izinsizakusebenza zamandla kanye nezinsizakusebenza zamandla olwandle. Ukuthuthukiswa nokusetshenziswa kwezinsizakusebenza zasolwandle akuhlukaniseki ocwaningweni nasekuthuthukisweni kwezinto ezikhethekile zasolwandle, futhi ukungqubuzana kanye nokuguga ezindaweni zasolwandle ezinzima kuyizinkinga ezibalulekile ezivimbela ukusetshenziswa kwezinto zasemanzini kanye nokuthuthukiswa kwemishini yasolwandle. Funda ngokugqwala kanye nokuziphatha kokuguga kwensimbi engagqwali engu-316L kanye ne-2205 ngaphansi kwezimo ezimbili zamanzi olwandle ezivame ukusetshenziswa: ukugqwala kwamanzi olwandle kanye nokuvikelwa kwe-cathodic, bese usebenzisa izindlela ezahlukahlukene zokuhlola ezifana ne-XRD, i-metallography, ukuhlolwa kwe-electrochemical kanye nokugqwala kanye nokusebenzisana kokuguga ukuze kuhlaziywe izinguquko zesigaba se-microstructure Kusukela ekhoneni, umphumela wokuguga okushelelayo kwamanzi olwandle ezimpahleni zokugqwala kanye nokuguga kwensimbi engagqwali uyahlaziywa. Imiphumela yocwaningo imi kanje:
(1) Izinga lokuguguleka elingu-316L ngaphansi komthwalo omkhulu lincane kunezinga lokuguguleka ngaphansi komthwalo ophansi. Ukuhlaziywa kwe-XRD kanye ne-metallographic kukhombisa ukuthi i-316L idlula ekuguqulweni kwe-martensitic ngesikhathi sokuguguleka kokushelela kwamanzi olwandle, futhi ukusebenza kahle kwayo ekuguqulweni cishe kungama-60% noma ngaphezulu; Uma kuqhathaniswa amazinga okuguqulwa kwe-martensite ngaphansi kwezimo ezimbili zamanzi olwandle, kwatholakala ukuthi ukugqwala kwamanzi olwandle kuphazamisa ukuguqulwa kwe-martensite.
(2) Izindlela zokuskena i-potentiodynamic polarization kanye nezindlela ze-electrochemical impedance zisetshenziswe ukutadisha ithonya lezinguquko zesakhiwo esingu-316L ekuziphatheni kokugqwala. Imiphumela ibonise ukuthi ukuguqulwa kwesigaba se-martensitic kuthinte izici kanye nokuqina kwefilimu engasebenzi ebusweni bensimbi engagqwali, okuholela ekugqwaleni kwensimbi engagqwali. Ukumelana nokugqwala kubuthakathaka; ukuhlaziywa kwe-electrochemical impedance (EIS) nakho kufinyelele esiphethweni esifanayo, kanti i-martensite ekhiqizwe kanye ne-austenite engaguquki kwakha ukuxhuma kukagesi okuncane kakhulu, okushintsha ukuziphatha kwe-electrochemical kwensimbi engagqwali.
(3) Ukulahleka kwezinto ezibonakalayoInsimbi engagqwali engu-316Lngaphansi kwamanzi olwandle kufaka phakathi ukungqubuzana okumsulwa nokulahlekelwa kwezinto ezigugile (W0), umphumela wokubambisana wokugqwala ekugugileni (S') kanye nomphumela wokubambisana wokugqwala ekugugileni (S'), kuyilapho ukuguqulwa kwesigaba se-martensitic kuthinta Ubudlelwano phakathi kokulahlekelwa kwezinto zengxenye ngayinye buyachazwa.
(4) Ukugqwala kanye nokuziphatha kokuguguleka2205Kwafundwa insimbi enezigaba ezimbili ngaphansi kwezimo ezimbili zamanzi olwandle. Imiphumela ibonise ukuthi: izinga lokuguguleka kwensimbi enezigaba ezimbili engu-2205 ngaphansi komthwalo omkhulu lalilincane, kanti ukuguguleka kokushelela kwamanzi olwandle kwabangela ukuthi isigaba se-σ senzeke ebusweni bensimbi enezigaba ezimbili. Izinguquko zesakhiwo ezifana nokuguquguquka, ukuhlukana kanye nokushintsha kwe-lattice kuthuthukisa ukumelana nokuguguleka kwensimbi enezigaba ezimbili; uma kuqhathaniswa ne-316L, insimbi enezigaba ezimbili engu-2205 inezinga lokuguguleka elincane kanye nokumelana nokuguguleka okungcono.
(5) Isikhungo sokusebenza se-electrochemical sasetshenziswa ukuhlola izakhiwo ze-electrochemical zobuso bokuguguleka kwensimbi enezigaba ezimbili. Ngemva kokuguguleka okushelelayo emanzini olwandle, amandla okuziguguleka kwe-2205insimbi yesigaba esikabili yehlile kanti ubuningi bamanje banda; kusukela endleleni yokuhlola i-electrochemical impedance (EIS) nayo yaphetha ngokuthi inani lokumelana kwendawo yokuguguleka kwensimbi ye-duplex liyancipha futhi ukumelana nokugqwala kwamanzi olwandle kuyancipha; isigaba se-σ esikhiqizwa ukuguguleka okushelelayo kwensimbi ye-duplex ngamanzi olwandle kunciphisa izakhi ze-Cr ne-Mo ezizungeze i-ferrite ne-austenite, okwenza insimbi ye-duplex ibe sengozini yokugqwala kwamanzi olwandle, futhi imigodi yemigodi nayo ivame ukwakheka kulezi zindawo ezinephutha.
(6) Ukulahleka kwezinto ezibonakalayoInsimbi ye-duplex engu-2205ikakhulukazi kuvela ekungqubuzaneni okumsulwa kanye nokulahlekelwa kwezinto ezigugile, okubangela cishe u-80% kuya ku-90% wokulahlekelwa okuphelele. Uma kuqhathaniswa nensimbi engagqwali engu-316L, ukulahlekelwa kwezinto zengxenye ngayinye yensimbi ye-duplex kukhulu kunokwe-316L. Kuncane.
Ngamafuphi, kungaphethwa ngokuthi insimbi yesigaba esiphindwe kabili engu-2205 inokumelana nokugqwala okungcono endaweni enamanzi olwandle futhi ifaneleka kakhulu ukusetshenziswa endaweni enamanzi olwandle enamanzi okugqwala nokuguguleka.
Isikhathi sokuthunyelwe: Disemba-04-2023