Njengengxenye yokulawula yokusebenza ebalulekile emishinini yezimboni, ukumelana nokugqwala kwamasondo esandla ensimbi engagqwali kunquma ngokuqondile ukuthembeka nempilo yesevisi yezinto zokusebenza ezindaweni ezinokhahlo. Ngokuthuthuka okusheshayo kwemboni yamakhemikhali, ubunjiniyela basolwandle, imishini yezokwelapha kanye neminye imikhakha, izidingo eziphakeme zibekwe ekuzinzeni kwamasondo ensimbi angenasici ngaphansi kwezimo zokusebenza ezidlulele njenge-asidi eqinile, isifutho sikasawoti omningi, izinga lokushisa eliphezulu nokucindezela okukhulu. Lesi sihloko sizohlaziya ngokuhlelekile indlela yokumelana nokugqwala kwamasondo esandla ensimbi engagqwali kusukela kubukhulu bokwakheka kwezinto, ukwelashwa kwendawo, ukuguquguquka kwemvelo kanye nokuqanjwa okusha kobuchwepheshe, futhi kuxoxwe ngezingqinamba zayo zobuchwepheshe nezisombululo kuhlanganiswe nezinqubo zemboni.
Okuqukethwe
1. Izinto ezibalulekile kanye nezindlela zokumelana nokugqwala kwamasondo esandla ensimbi engagqwali
1.1 Insimbi engagqwali ye-Austenitic (304/316L)
1.2 Insimbi engagqwali eyiDuplex nensimbi engagqwali enkulu
2. Umthelela wobuchwepheshe bokwelapha obungaphezulu ekumelaneni nokugqwala
3. Ukusebenza ezindaweni ezijwayelekile ezinokhahlo
4. Imodi yokwehluleka ukugqwala kanye nesu lokuvikela
5. Amacala ezicelo zemboni kanye nomhlahlandlela wokukhetha
6. Izitayela zokuthuthukiswa kobuchwepheshe besikhathi esizayo
1. Izinto ezibalulekile kanye nezindlela zokumelana nokugqwala kwamasondo esandla ensimbi engagqwali
1.1 Insimbi engagqwali ye-Austenitic (304/316L)
Izici zezinto ezibonakalayo:
304 insimbi engagqwali:iqukethe i-chromium engu-18-20% kanye ne-nickel engu-8-10%, futhi yakha ifilimu eminyene ye-chromium oxide (Cr₂O₃) ngaphezulu, engamelana nokugqwala emkhathini, emanzini ahlanzekile nendawo ene-asidi ebuthakathaka, futhi isetshenziswa kabanzi kumishini ejwayelekile yezimboni.
316L insimbi engagqwali:Ukwengeza u-2-3% we-molybdenum (Mo) kuthuthukisa kakhulu amandla okumelana ne-chloride ion pitting corrosion, futhi izinga lokushisa elibalulekile (CPT) lingafinyelela ngaphezu kwamadigri angu-40, okufanelekela izindawo ezinokhahlo njengamanzi olwandle nemidiya ye-chloride.
Indlela yokumelana nokugqwala:
Ukuvikelwa kwefilimu ye-Passivation:I-Chromium isabela nomoya-mpilo ukuze yakhe ifilimu ye-oxide engu-1-3 wama-nanometers awugqinsi, ivimbe ukungena kwemidiya ebolayo.
I-alloy element synergy:I-Molybdenum ivimbela i-chloride ion adsorption ngokwenza i-MoO₄²⁻, futhi i-nickel iqinisa isakhiwo se-austenite ukuze kwehliswe ingcuphe yokugqwala kwe-intergranular.
1.2 Insimbi engagqwali eyiDuplex nensimbi engagqwali enkulu
I-Duplex insimbi engagqwali (efana ne-2205):
Isakhiwo sesigaba se-Ferrite ne-austenite esikabili-, esinamandla aphezulu kanye nokumelana ne-chloride stress corrosion cracking (SCC), amandla esivuno angu-450MPa, afanele amasondo esandla epulatifomu yasolwandle.
Insimbi engagqwali enkulu (efana ne-254SMO):
Iqukethe u-6% we-molybdenum ne-nitrogen, elingana nokuphikiswa kwe-pitting (PREN) Okukhulu noma kulingana no-40. Ingasetshenziswa isikhathi eside ezindaweni ezigxilile kakhulu ze-hydrochloric acid ne-sulfuric acid futhi isetshenziselwa ukunemba kwamasondo ezandla kuma-reactor amakhemikhali.
2. Ithonya lobuchwepheshe bokwelapha okungaphezulu ekumelaneni nokugqwala
I-Electrolytic polishing:
Yehlisa ukuhwaqazeka kwendawo (Ra) ibe ngaphansi kuka-0.4μm, yehlise ukunamathela kokungcola nokugqwala kwendawo, futhi ifanele indawo eyinyumba yemishini yokwenza imithi.
Ukuqhunyiswa kwesihlabathi:
Khulisa ubulukhuni bobuso kanye nokumelana nokugqokwa, kodwa ukwakheka kwe-microporous kungase kukhulise ukungena kwama-ion e-chloride, futhi ukwelashwa kwe-passivation kuyadingeka.
I-Chemical passivation:
Ukucwiliswa ku-nitric acid noma i-citric acid kuthuthukisa ukuminyana kwefilimu ye-oxide futhi kuthuthukisa ukuzinza kwesondo lesandla endaweni ene-acidic.
3. Ukusebenza ezindaweni ezijwayelekile ezinokhahlo
3.1 Indawo yesifutho sasolwandle kanye nosawoti omningi
Izinselelo zeCorrosion:
I-chloride ions (Cl⁻) ibhubhisa ifilimu ye-passivation, ibangele ukugqwala kwemigodi nokuqhekeka. Impilo yamasondo esandla ensimbi engu-316L ingafinyelela amahora angaphezu kuka-3000 ekuhlolweni kwesifutho sikasawoti (ASTM B117).
Isixazululo:
Use molybdenum-containing materials (such as 316L), and the flow rate design is >1.5m/s ukunciphisa ukunqwabelana kwenhlabathi nokugwema ukuthintana okuqondile phakathi kwesondo lesandla nensimbi ye-carbon ukuze kubangele ukugqwala kwe-galvanic.
3.2 I-asidi eqinile nendawo yamakhemikhali e-alkali eqinile
I-Acidic medium (njenge-sulfuric acid, i-hydrochloric acid):
Izinga lokugqwala lika-316L isondo lensimbi engagqwali ku-sulfuric acid ne-concentration of<15% is <0.1mm/year, but Hastelloy or titanium materials need to be used instead in hydrochloric acid environment.
I-alkaline medium (efana ne-NaOH):
Insimbi engagqwali ye-Austenitic ingasetshenziswa ngokuzinza ekuhlanganiseni okungu-50% nangaphansi kuka-105℃, kodwa izinga lokushisa eliphezulu i-alkali eqinile ijwayele ukucindezeleka kokuqhekeka kokugqwala (SCC), futhi inqubo yokwelapha ukushisa idinga ukuthuthukiswa.
3.3 Izimo eziphakeme kakhulu zokushisa, ukucindezela okuphezulu kanye nezinga lokushisa eliphansi
Indawo yokushisa ephezulu (+300 degree):
Isondo lesandla lensimbi engu-304 lingase liqwashiswe ngaphansi kwezinga lokushisa eliphezulu eliqhubekayo, okuholela ekugqwaleni kwe-intergranular, kanye nekhabhoni ephansi (304L) noma izinto ezizinzile (321) ezidingekayo.
Ukufakwa kwezinga lokushisa eliphansi (njenge- -196℃liquid nitrogen equipment):
Insimbi engagqwali ye-Austenitic (efana no-316L) ayinakho ukuguquka okubandayo okuphukayo, futhi izinga lokugcinwa kokuqina komthelela lingu-80%, elifanele amasondo esandla evaluli yegesi yemvelo ewuketshezi.
4. Imodi yokwehluleka ukugqwala kanye nesu lokuvikela
Izindlela zokwehluleka ezijwayelekile:
I-Pitting: Ifilimu ye-passivation yasendaweni iyadabuka ukuze kwakhe-amabhethri amancane, avamile{1}ezinhlelweni ze-chlorine ephezulu futhi angancishiswa ngokwandisa okuqukethwe kwe-molybdenum noma ama-surface coatings (njenge-PTFE).
I-Stress corrosion cracking (SCC):Ngaphansi kwesenzo esihlanganisiwe se-chloride nengcindezi yokuqina, izinga lokukhula kokuqhekeka kwesondo lesandla elingu-316L endaweni ye-NH4Cl lifinyelela ku-10⁻⁶ mm/s, futhi ukugxiliswa kokucindezeleka okusalayo kufanele kugwenywe.
Ubuchwepheshe bokuvikela:
Ukuvikelwa kwe-Cathode: Faka amabhulokhi ezinc endaweni yamanzi olwandle ukuze unciphise amandla esondo lesandla abe ngaphansi -0.85V (vs. SCE).
Ukuvikelwa kokumboza: Kusetshenziswa i-Plasma spraying Al₂O₃ coating, enokumelana nezinga lokushisa okungama-800℃kanye nokuncipha kwezinga lokugqwala ngo-90%.
5. Amacala ezicelo zemboni kanye nomhlahlandlela wokukhetha
Imboni yamakhemikhali:
I-reactor ye-phosphoric acid yesitshalo samakhemikhali isebenzisa amasondo esandla ensimbi engu-254SMO super stainless steel, futhi impilo yaso yesevisi inwetshwa ibe iminyaka eyi-10 endaweni engama-85℃kanye no-40% we-phosphoric acid.
Ubunjiniyela basolwandle:
Isondo lesandla se-valve yesikhulumi sikawoyela esingasogwini lisebenzisa insimbi engagqwali engu-2205 eyi-duplex, enokumelana nokugqwala kwesifutho sikasawoti okuphindwe izikhathi ezi-3 ngaphezu kwaleyo ye-304, futhi umjikelezo wokunakekela unwetshwa iminyaka emi-5.
Imingcele yokukhetha:
Ukuhambisana kwemidiya: Bheka inani le-PREN (PREN=%Cr+3.3×%Mo+16×%N), i-PREN＞35 ifanele indawo ene-chlorine ephezulu.
Izakhiwo zikamshini: Ukuqina kwamasondo ezandla angu-316L kumele kufinyelele ku-HV150-200 ukuze kugwenywe ukuwohloka nokwehluleka kokuvala uphawu.
6. Izitayela zokuthuthukiswa kobuchwepheshe besikhathi esizayo
Amasondo ezandla okuqapha ahlakaniphile:
Izinzwa zokugqwala ezihlanganisiwe ziqapha amandla angaphezulu kanye ne-membrane impedance ngesikhathi sangempela, futhi zixwayisa ngezingozi zokugqwala nge-inthanethi Yezinto.
Ukwelashwa kwendawo evumelana nemvelo:
Thuthukisa izinqubo zamahhala ze-chromium-ezifana nokwelashwa kwe-silane) ukuze unciphise ukungcoliswa kwe-chromium ene-hexavalent futhi uthobelane nomyalelo we-RoHS.
Izinto ezisetshenziswayo ezihlanganisiwe:
Amasondo esandla e-Carbon fiber reinforced stainless steel (CF-SS) anokwenyuka kwamandla ngo-50% kanye nokuncipha kwesisindo ngo-30%, futhi afanele ukunemba okokusebenza kwe-aerospace.
Isifinyezo
Ukumelana nokugqwala kwamasondo esandla ensimbi engagqwali kuncike ekukhethweni kwezinto ezibonakalayo, ukwelashwa kwendawo kanye nokuvumelana nezimo zemvelo. Ezindaweni ezinokhahlo ezifana nolwandle namakhemikhali, i-316L ne-duplex stainless steel zibonisa ukuzinza okuhle kakhulu ngokuvikelwa kwefilimu ye-passivation kanye nokwenza kahle kwe-alloy, kodwa xwaya umgodi kanye nengcindezi yokuqhekeka kokugqwala. Ngokuzayo, ukusetshenziswa kokuqapha okuhlakaniphile kanye nezinto ezithinta imvelo kuzothuthukisa ukuthuthukiswa kwamasondo ezandla ukuze athembeke kakhulu kanye nokunakekelwa okuphansi. Ukukhetha okulungile kudinga ukucatshangelwa okuphelele kwezici ezimaphakathi, imithwalo yemishini kanye nezici zezindleko ukuze kukhuliswe ukusebenza kwawo wonke umjikelezo wempilo.
Incazelo Yemikhiqizo
1: Iliphi ibanga lensimbi engagqwali elivame ukusetshenziswa ekukhiqizeni amasondo esandla ensimbi engagqwali?
I-A1: Amasondo esandla ensimbi engagqwali ngokuvamile enziwa kusukela kumabanga afana ne-304 kanye ne-316 yensimbi engagqwali ngenxa yokumelana nokugqwala nokuqina.
2: Yiziphi izinketho zokuqeda phezulu ezitholakalayo zamasondo ensimbi angenasici?
I-A2: Ukuqedwa kwendawo okujwayelekile kuhlanganisa izindawo ezipholishiwe, ezibhulashiwe, noma ezipholishwe ngogesi, ezinikeza ukubukeka okubushelelezi nokubukeka kahle.
3: Ingabe ukuklanywa nobukhulu bamasondo esandla ensimbi engagqwali kungenziwa ngendlela oyifisayo ukuze ivumelane nezinhlelo ezithile zokusebenza?
I-A3: Yebo, amasondo ezandla angenziwa ngendlela oyifisayo ngokuya ngobukhulu, umumo, osayizi bobhore, ngisho nezimpawu eziqoshiwe ezisekelwe ezidingweni zomthengi.
4: Uyini umthwalo-umthamo wokuthwala wamasondo esandla ensimbi engagqwali, futhi ahlala isikhathi eside kangakanani ekusetshenzisweni okuhlukahlukene?
I-A4: Amasondo esandla ensimbi engagqwali aklanyelwe ukumelana nemithwalo ehlukahlukene ngokuya ngosayizi nokwakhiwa kwawo. Ziyaziwa ngokuqina kwazo kanye nokumelana nokuguga.
