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20MnTiB tšepe ke sesebelisoa sa bolt se matla a phahameng se sebelisoang ka ho fetesisa bakeng sa marokho a sebopeho sa tšepe naheng ea heso, 'me ts'ebetso ea ona e bohlokoa haholo ts'ebetsong e bolokehileng ea marokho.Ho ipapisitse le lipatlisiso tsa tikoloho ea sepakapaka Chongqing, phuputso ena e entse tharollo ea kutu e tšoanang le boemo ba leholimo bo mongobo ba Chongqing,' me ea etsa liteko tsa maemo a leholimo a leholimo a leholimo a Chongqing. Chongqing.Liphello tsa mocheso, pH ea boleng le ts'ebeliso ea tharollo ea corrosion e etsisitsoeng boitšoarong ba khatello ea maikutlo ea 20MnTiB liboutu tse matla a phahameng li ile tsa ithutoa.
20MnTiB tšepe ke thepa e sebelisoang ka ho fetisisa ea matla a phahameng ka ho fetisisa bakeng sa marokho a sebopeho sa tšepe naheng ea heso, 'me ts'ebetso ea eona ke ea bohlokoa haholo ts'ebetsong e sireletsehileng ea marokho.Li et al. 1 e ile ea lekola thepa ea tšepe ea 20MnTiB e atisang ho sebelisoa sehlopheng sa 10.9 liboutu tse matla a phahameng mochesong o phahameng oa 20 ~ 700 ℃, 'me ea fumana lekhalo la khatello ea maikutlo, matla a tlhahiso, matla a tsitsipano, modulus ea Young, le bolelele. le katoloso coefficient.Zhang et al. 2, Hu et al. 3, joalo-joalo, ka tlhahlobo ea sebopeho sa lik'hemik'hale, tlhahlobo ea thepa ea mochini, tlhahlobo ea microstructure, tlhahlobo ea macroscopic le microscopic ea khoele, 'me liphetho li bontša hore lebaka le ka sehloohong la ho robeha ha liboutu tse matla haholo le amana le mefokolo ea likhoele.
Liboutu tse matla haholo bakeng sa marokho a tšepe li atisa ho sebelisoa nako e telele sebakeng se mongobo. Lintho tse kang mongobo o phahameng, mocheso o phahameng, le sedimentation le ho monya ha lintho tse kotsi tikolohong li ka baka kutu habonolo ha meaho ea tšepe. Corrosion e ka baka tahlehelo e matla ea bolt ea ho putlama, e fellang ka hore ho be le mapheo a mangata le ho hola. ho fokotsa bophelo ba li-bolts tse matla haholo esita le ho etsa hore li robehe.Ho fihlela joale, ho na le liphuputso tse ngata mabapi le phello ea ho senyeha ha tikoloho ka ts'ebetso ea khatello ea kelello ea thepa.Catar et al4 e ile ea batlisisa boitšoaro ba khatello ea kelello ea li-alloys tsa magnesium tse nang le likarolo tse fapaneng tsa aluminium libakeng tse nang le acidic, alkaline le ho se nke lehlakore ka mokhoa o liehang oa khatello ea khatello ea khatello ea kelello le tlhahlobo ea khatello ea kelello ea alkaline ea alkaline e ithutang lebelo la khatello ea kelello ea alkaline ea alkaline ea alkaline e liehang ho hlahlojoa le tlhahlobo ea khatello ea kelello ea SS. boits'oaro ba Cu10Ni alloy ka 3.5% NaCl tharollo ka boteng ba mefuta e fapaneng ea li-ion tsa sulfide.Aghion et al.6 e ile ea hlahloba ts'ebetso ea kutu ea die-cast magnesium alloy MRI230D ka 3.5% tharollo ea NaCl ka teko ea ho qoelisoa, tlhahlobo ea letsoai ea letsoai, tlhahlobo ea potentiodynamic ea alrocorrization ea potentiodynamic e ithutileng boitšoaro ba potentiodynamic alrocorr. 9Cr martensitic steel e sebelisang SSRT le mekhoa e tloaelehileng ea tlhahlobo ea electrochemical, mme e fumane phello ea li-ion tsa chloride ho static corrosion behaviour ea martensitic steel at room temperature. khatello ea maikutlo holim'a khatello ea khatello ea metsi a leoatleng ho hanyetsa ho senyeha ha 00Cr21Ni14Mn5Mo2N austenitic stainless steel. 10 e ile ea hlahloba ho lieha ho robeha ha lisampole tse nang le litekanyetso tse fapaneng tsa matla a matla ka boima bo shoeleng bo liehang teko ea ho robeha le SSRT. Ho etsoa tlhahiso ea hore matla a thata a 20MnTiB tšepe le 35VB liboutu tse matla a phahameng a tšepe a lokela ho laoloa ho 1040-1190MPa. tikoloho e senyang, ha tikoloho ea sebele ea tšebeliso ea liboutu tse matla haholo e rarahane haholo 'me e na le lintho tse ngata tse susumetsang, tse kang pH ea boleng ba bolt.Ananya et al. 11 o ile a ithuta phello ea liparamente tsa tikoloho le lisebelisoa sebakeng se senyang ka ho senya le khatello ea maikutlo ea ho senyeha ha litšepe tse sa hloekang tsa duplex.Sunada et al. 12 e ile ea etsa liteko tsa ho phatloha ha mocheso oa kamore ea SUS304 ka tšepe ea metsi e nang le H2SO4 (0-5.5 kmol/m-3) le NaCl (0-4.5 kmol/m-3) CO2 / CO mahloriso, khatello ea khase le nako ea ho senyeha ha khatello ea khatello ea khatello ea tšepe ea tšepe ea A516. Ho sebelisa tharollo ea NS4 e le tharollo ea ho etsisa metsi a fatše, Ibrahim et al. 14 e ile ea batlisisa phello ea liparamente tsa tikoloho tse kang mahloriso a bicarbonate ion (HCO), pH le mocheso holim'a khatello ea maikutlo ea ho phatloha ha tšepe ea API-X100 ka mor'a ho ebola.Shan et al. 15 o ile a ithuta phapang molao oa khatello ea kelello kutu cracking susceptibility ea austenitic tšepe e sa jeleng paate 00Cr18Ni10 le mocheso tlas'a maemo a fapaneng mocheso (30 ~ 250 ℃) tlas'a boemo ba batho ba batsho metsi seaplane ka simulated mashala-to-hydrogen semela ke SSRT.Han et al.16 tšoauoa ea hydrogenng stainless sefumolohang sampole e phahameng susceptibility-moroalo e le 16 e tšoauoa e phahameng susceptibility hydrogen embrittlement e tsoetsoeng ke hydrogen embrittlement e phahameng ea moroalo. teko ea ho robeha e liehang le SSRT.Zhao17 e ithutile liphello tsa pH, SO42-, Cl-1 ka boitšoaro ba khatello ea kelello ea GH4080A alloy ka SSRT. mocheso oa kamore.Leha ho le joalo, ho na le lithuto tse fokolang tse mabapi le phello ea ho senyeha ha tikoloho ho liboutu tse matla tse phahameng tsa tšepe tsa 20MnTiB.
E le hore u fumane mabaka a ho hlōleha ha liboutu tse matla tse sebelisoang ka marokho, mongoli o entse letoto la lithuto.Ho ile ha khethoa mehlala ea bolt ea matla a phahameng, 'me mabaka a ho hlōleha ha mehlala ena a ile a tšohloa ho tloha maikutlong a sebopeho sa lik'hemik'hale, ho robeha ha microscopic morphology, metallographic structure le mechanical properties analysis19, 20 pheputso ea morao tjena lilemong tsa morao tjena tsa Chongqing. Ho entsoe morero oa corrosion o etsisang moea o mongobo oa Chongqing. Liteko tsa kutu ea khatello ea maikutlo, liteko tsa ho bola ha electrochemical le liteko tsa mokhathala oa liboutu tse matla haholo sebakeng sa Chongqing se etsisitsoeng ke boemo ba leholimo ba mongobo. ka liteko tsa thepa ea mochini, tlhahlobo ea macroscopic le microscopic, le lihlahisoa tsa kutu.
Chongqing e karolong e ka boroa-bophirimela ho Chaena, e ka holimo ho Nōka ea Yangtze, 'me e na le mocheso o mongobo oa monsoon oa mocheso oa selemo le selemo oa 16-18 ° C, mocheso oa selemo le selemo o lekanyelitsoeng ke boholo ba 70-80%, lihora tsa selemo le selemo ke lihora tse 1000-1400, 'me karolo ea 35 lekholong ke karolo ea 35 feela.
Ho latela litlaleho tse amanang le khanya ea letsatsi le mocheso oa tikoloho Chongqing ho tloha 2015 ho isa 2018, karolelano ea mocheso ea letsatsi le letsatsi Chongqing e tlase ho 17°C le holimo ho 23°C. Thempereichara e phahameng ka ho fetisisa holim'a 'mele oa borokho oa Chaotianmen Bridge e Chongqing e ka fihla ho 50 ° C °C21,22. Ka hona, maemo a mocheso bakeng sa teko ea khatello ea kelello e behiloe ho 25 ° C le 50 ° C.
Boleng ba pH ba tharollo ea corrosion bo khetholla ka ho toba palo ea H +, empa ha ho bolele hore pH ea boleng bo tlaase, ho senyeha habonolo ho etsahala. Phello ea pH liphethong e tla fapana bakeng sa lisebelisoa le litharollo tse fapaneng. le 7.5 hammoho le lipatlisiso tsa lingoliloeng23 le pH mefuta e fapaneng ea metsi a pula ea selemo le selemo Chongqing.2010 ho isa 2018.
E le hore ho ka ba le tšusumetso e kholo holim'a motsoako oa tharollo ea kutu, ho na le li-ion tse ngata ka har'a tharollo ea corrosion, 'me ho ba le tšusumetso e kholo ho thepa ea thepa. E le ho ithuta phello ea ts'ebetso ea ts'ebetso ea ts'ebetso ea ho senya khatello ea kelello ea liboutu tse matla, laboratori ea maiketsetso e ile ea potlakisa ts'ebetso ea corrosion, 'me ho ile ha hlokomeloa hore ho ile ha etsoa corrosion level ntle le corrosion level4. original simulated corrosion solution concentration (1×), 20 × original simulated corrosion solution concentration (20 ×) le 200 × original simulated corrosion solution concentration (200 ×).
Tikoloho e nang le mocheso oa 25 ℃, pH ea boleng ba 5.5, 'me mahloriso a tharollo ea pele e ts'oaretsoeng ke eona e haufi le maemo a sebele a ho sebelisoa ha liboutu tse matla haholo bakeng sa marokho. sehlopha sa taolo.Ha liphello tsa mocheso, mahloriso kapa pH boleng ba tharollo e ts'oanang ea ts'ebetso ea ts'ebetso ea khatello ea kelello ea li-bolts tse matla haholo li ne li batlisisoa ka ho latellana, lintlha tse ling li ile tsa lula li sa fetohe, tse neng li sebelisoa e le boemo ba liteko tsa sehlopha sa taolo ea litšupiso.
Ho ea ka tlhaloso e khutšoanyane ea boleng ba tikoloho ea 2010-2018 e fanoeng ke Chongqing Municipal Bureau of Ecology and Environmental, 'me e bua ka likarolo tsa pula tse tlalehiloeng ho Zhang24 le lingoliloeng tse ling tse tlalehiloeng Chongqing, e leng tharollo ea ho senyeha ha SO42- e entsoe. tharollo e etsisoang ea kutu e bonts'oa ho Lethathamo la 1:
Tharollo ea corrosion e etsisitsoeng e lokiselitsoe ka mokhoa oa ho leka-lekana ka lik'hemik'hale tsa ion concentration ho sebelisa li-analytical reagents le metsi a silafalitsoeng.The pH value of the simulated corrosion solution e ile ea fetoloa ka ho nepahala pH meter, nitric acid solution le sodium hydroxide solution.
E le ho etsisa boemo ba leholimo ba mongobo Chongqing, sehlahlobi sa sesepa sa letsoai se fetotsoe ka ho khetheha 'me se entsoe25. Joalo ka ha ho bontšitsoe setšoantšong sa 1, lisebelisoa tsa liteko li na le mekhoa e 'meli: tsamaiso ea letsoai le tsamaiso ea mabone.Sisteme ea ho fafatsa letsoai ke mosebetsi o ka sehloohong oa lisebelisoa tsa liteko, tse nang le karolo ea taolo, karolo ea spray le karolo ea ho kenya letsoho. karolo e entsoe ka likarolo tsa ho lekanya mocheso, tse utloang mocheso ka kamoreng ea teko. Karolo ea taolo e entsoe ka microcomputer, e kopanyang karolo ea spray le karolo ea induction ho laola ts'ebetso eohle ea liteko.Sisteme ea mabone e kentsoe ka kamoreng ea teko ea letsoai ho etsisa khanya ea letsatsi.Sistimi ea mabone e na le mabone a infrared le taolo ea nako. hona joale.
Li-stress corrosion samples tlas'a mojaro o sa khaotseng li ile tsa sebetsoa ho latela NACETM0177-2005 (Tlhahlobo ea Laboratori ea Sulfide Stress Cracking and Stress Corrosion Cracking Resistance of Metals in a H2S Environment) .Stress corrosion specimens li ile tsa hloekisoa pele ka acetone le ultrasonic mechanical cleaning le ho tlosa joala bo omisitsoeng, ebe o kenya oli e omisitsoeng ka metsi. lisampole tse hloekileng ka kamoreng ea teko ea sesebelisoa sa tlhahlobo ea spray ea letsoai ho etsisa boemo ba ho bola sebakeng se mongobo sa boemo ba leholimo ba Chongqing. Ho latela maemo a tloaelehileng a NACETM0177-2005 le tlhahlobo ea tlhahlobo ea spray ea letsoai GB/T 10,125-2012, nako ea teko ea khatello ea khatello ea maikutlo e sa khaotseng thutong ena e entsoe ka mokhoa o ts'oanang ho etsoa tlhahlobo ea tlhahlobo ea corrosion8. tlas'a maemo a fapaneng a kutu ho mochini oa liteko oa bokahohle oa MTS-810, 'me thepa ea bona ea mochini le morphology ea fracture corrosion e ile ea hlahlojoa.
Setšoantšo sa 1 se bonts'a macro-le-micro-morphology ea ho senyeha ha holim'a metsi a matla a phahameng a matla a bolt a nang le khatello ea kelello tlas'a maemo a fapaneng a ho senya.2 le 3 ka ho latellana.
Macroscopic morphology ea li-stress corrosion specimens tsa 20MnTiB liboutu tse matla haholo tlas'a maemo a fapaneng a etsisitsoeng a kutu: (a) ha ho kutu; (b) nako e le 1; (c) 20 ×; (d) 200 ×; (e) pH3.5; (f) pH 7.5; (g) 50°C.
Micromorphology ea lihlahisoa tsa kutu tsa 20MnTiB liboutu tse matla haholo libakeng tse fapaneng tse etsisitsoeng tsa kutu (100 ×): (a) 1 nako; (b) 20 ×; (c) 200 ×; (d) pH3.5; (e) pH7 .5; (f) 50°C.
E ka bonoa ho tloha Fig. 2a hore holim'a uncorroded phahameng-matla bolt mohlala o bontša khanya e khanyang metallic ntle le corrosion e totobetseng.Leha ho le joalo, tlas'a boemo ba tharollo ea pele e etsisitsoeng ea ho bola (setšoan. 2b), bokaholimo ba sampuli bo ne bo koahetsoe ka mokhoa o itseng ka lesela le sootho le bofubelu bo bofubelu bo bofubelu bo le bofubelu, le libaka tse ling tse hlakileng tsa lihlahisoa tsa tšepe li ntse li le teng, 'me libakeng tse ling tse hlakileng tsa lihlahisoa tsa tšepe li ne li ntse li le teng. e ile ea senyeha hanyenyane, 'me tharollo ea ho senya e etsisitsoeng e ne e se na phello holim'a sampuli. Thepa ea lintho tse bonahalang e na le phello e fokolang.Leha ho le joalo, tlas'a boemo ba 20 × original simulated corrosion solution concentration (sa feiga. 2c), bokaholimo ba mohlala oa bolt bo matla bo phahameng bo koahetsoe ka ho feletseng ke lihlahisoa tse ngata tsa tan corrosion le palo e nyenyane ea bosootho bo bofubelu bo bofubelu.sehlahisoa, ha ho na ho bonahala eka metallic luster e ile ea fumanoa, 'me ho ne ho e-na le sehlahisoa se senyenyane sa sootho. tlas'a boemo ba 200 × original simulated corrosion solution concentration (Figure 2d), bokaholimo ba sampole bo koahetsoe ka ho feletseng ke lihlahisoa tse sootho tse sootho, 'me lihlahisoa tse sootho tse ntšo li hlaha libakeng tse ling.
Ha pH e fokotseha ho ea ho 3.5 (setšoantšo sa 2e), lihlahisoa tse nang le 'mala oa tan-colored li ne li le teng ka ho fetisisa holim'a lisampole,' me tse ling tsa lihlahisoa tsa kutu li ne li ntšitsoe.
Setšoantšo sa 2g se bontša hore ha mocheso o ntse o eketseha ho ea ho 50 ° C, lihlahisoa tsa lihlahisoa tse sootho tse bofubelu holim'a sampuli li fokotseha haholo, ha lihlahisoa tse khanyang tse sootho li koahela bokaholimo ba sampuli sebakeng se seholo.Sehlahisoa sa lihlahisoa tsa lihlahisoa se batla se hlephile, 'me lihlahisoa tse ling tse sootho-botšo lia khaoloa.
Joalokaha ho bonts'itsoe ho Setšoantšo sa 3, tlas'a maemo a fapaneng a kutu, lihlahisoa tsa kutu tse holim'a 20MnTiB li-stress tsa corrosion tsa 20MnTiB tse matla haholo li fokotsehile, 'me botenya ba lesela la kutu bo eketseha ka ho eketseha ha motsoako oa tharollo ea ho bola. sampole e ka aroloa ka mekhahlelo e 'meli: karolo e ka ntle ea lihlahisoa tsa kutu e ajoa ka mokhoa o ts'oanang, empa palo e kholo ea mapheo a hlaha; karolo e ka hare ke sehlopha se hlephileng sa lihlahisoa tse senyang. Tlas'a boemo ba 20 × ea pele e ts'oanang le ts'ebetso ea ts'oaetso (setšoantšo sa 3b), lera la kutu holim'a sampuli e ka aroloa ka likarolo tse tharo: lera le ka ntle haholo-holo le qhalakantsoeng lihlahisoa tsa lihlahisoa tsa lihlopha, tse hlephileng le tse sireletsang, 'me ha li na ts'ebetso e ntle; Sekhahla se bohareng ke sehlahisoa sa sehlahisoa se ts'oanang, empa ho na le mapheo a totobetseng, 'me li-ion tse senyang li ka feta mapetsong' me tsa senya substrate; karolo e ka hare ke lera le letenya la lihlahisoa tsa kutu ntle le mapetsong a totobetseng, a nang le phello e ntle ea tšireletso holim'a substrate. Tlas'a boemo ba 200 × ea pele e ts'oanelang ho senya tharollo ea mahloriso (setšoantšo sa 3c), lera la kutu holim'a sampuli e ka aroloa ka likarolo tse tharo: lera le ka ntle ke sehlahisoa se tšesaane le se ts'oanang sa kutu; karolo e bohareng e na haholo-holo e bōpehileng joaloka petal le e bōpehileng joaloka flake Lera le ka hare ke lera le teteaneng la lihlahisoa tse se nang mapetsong a hlakileng le masoba, a nang le phello e ntle ea tšireletso holim'a substrate.
E ka bonoa ho Setšoantšo sa 3d hore tikolohong e ts'oanang ea ts'ebetso ea pH 3.5, ho na le palo e kholo ea lihlahisoa tse nang le flocculent kapa nale-like corrosion holim'a setšoantšo sa 20MnTiB se nang le matla a phahameng a matla. corrosion layer e na le mapetsong a hlakileng.
E ka bonoa ho tloha setšoantšong sa 3f hore ha mocheso o nyolohela ho 50 ° C, ha ho na lera le hlakileng le teteaneng le ka hare le ileng la fumanoa mohahong oa lera la kutu, e leng se bontšang hore ho ne ho e-na le likheo pakeng tsa likarolo tsa kutu ho 50 ° C, e leng se ileng sa etsa hore substrate e se ke ea koaheloa ka ho feletseng ke lihlahisoa tsa kutu. E fana ka tšireletso khahlanong le tšekamelo e ntseng e eketseha ea kutu ea substrate.
Mehaho ea mochini oa liboutu tse matla haholo tlas'a kutu e sa feleng ea khatello ea moroalo libakeng tse fapaneng tse senyang li bonts'oa ho Lethathamo la 2:
Ho ka bonoa ho Lethathamo la 2 hore thepa ea mochini ea 20MnTiB ea matla a phahameng a bolt e ntse e fihlela litlhoko tse tloaelehileng kamora tlhahlobo ea mokoloto o omileng o potlakisa tlhahlobo ea kutu libakeng tse fapaneng tse etsisitsoeng tsa kutu, empa ho na le ts'enyehelo e itseng ha e bapisoa le e sa senyehang. sampole. 20 × kapa 200 × mahloriso a tharollo e ts'oanang, ho lelefatsa ha sampuli ho fokotsehile haholo. Thepa ea mechine e tšoana le likhahla tsa 20 × le 200 × tsa pele tse entsoeng li-corrosion solutions. fokotseha haholo, 'me sekhahla sa ho fokotseha ha sebaka se haufi haholo le boleng bo tloaelehileng.
The fracture morphologies ea 20MnTiB high-strong-bolt bolt corrosion specimens tlas'a maemo a fapaneng a kutu a bonts'itsoe ho Setšoantšo sa 4, e leng macro-morphology ea ho robeha, sebaka sa fiber bohareng ba ho robeha, molomo oa micro-morphological oa sebopeho sa ho kuta, le bokaholimo ba sampole.
Li-macroscopic le microscopic fracture morphologies tsa 20MnTiB li-bolt tse matla a phahameng libakeng tse fapaneng tse etsisitsoeng tsa kutu (500×): (a) ha ho kutu; (b) nako e le 1; (c) 20 ×; (d) 200 ×; (e) pH3.5; (f) pH7.5; (g) 50°C.
E ka bonoa ho setšoantšo sa 4 hore fracture ea 20MnTiB high-strong-bolt bolt stress corrosion specimen tlas'a maemo a sa tšoaneng a ts'oanelang a ho senya ho fana ka fracture e tloaelehileng ea komiki. Ha ho bapisoa le mohlala o sa tsitsang (setšoantšo sa 4a), sebaka se bohareng sa sebaka sa fiber crack se batla se le senyenyane. , sebaka sa ho kuta molomo se seholoanyane.Sena se bontša hore thepa ea mechine ea thepa e senyeha haholo ka mor'a ho senyeha.Ka ho eketseha ha motsoako oa tharollo ea ketsiso ea ho bola, likoti tse sebakeng sa fiber bohareng ba fracture li ile tsa eketseha, 'me ho hlakile hore ho na le li-seams tse tahang. mohlala, 'me ho ne ho e-na le lihlahisoa tse ngata tsa kutu holim'a metsi.sampole.
E nkiloe ho Setšoantšo sa 3d hore ho na le mapetsong a totobetseng a lera la kutu holim'a sampuli, e se nang phello e ntle ea tšireletso holim'a matrix. Ka mokhoa o ts'oanang oa ho senya oa pH 3.5 (Setšoantšo sa 4e), bokaholimo ba sampuli bo senyeha haholo, 'me sebaka se bohareng sa fiber ho hlakile hore se senyenyane. , Ho na le palo e kholo ea li-seams tse sa tloaelehang tsa ho lla bohareng ba sebaka sa fiber.Ka keketseho ea pH ea boleng ba tharollo ea corrosion e etsisitsoeng, sebaka sa ho taboha sebakeng sa fiber bohareng ba fracture se fokotseha, sekoti se fokotseha butle-butle, 'me botebo ba sekoti bo boetse bo fokotseha butle-butle.
Ha mocheso o nyolohela ho 50 ° C (setšoantšo sa 4g), sebaka sa ho robeha ha sampuli e ne e le se seholo ka ho fetisisa, likoti tse bohareng ba fiber li ile tsa eketseha haholo, 'me botebo ba sekoti le bona bo ile ba eketseha,' me sehokelo pakeng tsa molomo oa ho kuta le karolo ea sampuli ea eketseha. Lihlahisoa tsa kutu le likoti li ile tsa eketseha, tse tiisitseng mokhoa o tebileng oa ho senyeha ha substrate o bontšitsoeng setšoantšong sa 3f.
Phaello ea pH ea tharollo ea kutu e tla baka tšenyo e itseng ho thepa ea mechine ea 20MnTiB matla a phahameng a liboutu, empa phello ha e bohlokoa.Ka tharollo ea corrosion ea pH 3.5, palo e kholo ea lihlahisoa tsa flocculent kapa nale tse kang nale li ajoa holim'a sampuli, 'me kutu e nang le tšireletso e hlakileng e ke keng ea e-ba teng. likoting tsa kutu le palo e kholo ea lihlahisoa tsa kutu ka har'a morphology ea microscopic ea fracture ea sampole.Sena se bontša hore bokhoni ba sampole ea ho hanela deformation ka matla a kantle bo fokotsehile haholo tikolohong e nang le asiti, mme tekanyo ea khatello ea maikutlo ea ts'ebeliso ea thepa e eketseha haholo.
Tharollo ea pele e etsisitsoeng ea kutu e ne e e-na le phello e fokolang ho thepa ea mechine ea lisampole tsa bolt tse matla a phahameng, empa ha mahloriso a tharollo ea ho senya e etsisoang a eketseha ho fihlela makhetlo a 20 a tharollo ea pele e entsoeng, thepa ea mechine ea lisampole e ile ea senyeha haholo, 'me ho ne ho e-na le kutu e totobetseng ho fracture microstructure. likoti, mapetsong a bobeli le lihlahisoa tse ngata tsa ho bola.
Ha mocheso o etsisoang oa kutu e le 25 ℃, matla a tlhahiso le matla a tsitsitseng a 20MnTiB ea matla a phahameng a bolt ha a fetohe haholo ha a bapisoa le mehlala e sa senyehang. molomo e ne e le kholo ka ho fetisisa, 'me ho ne ho e-na le li-dimples sebakeng se bohareng ba fiber.Ho ile ha eketseha ka mokhoa o tsotehang, botebo ba sekoti bo ile ba eketseha, lihlahisoa tsa kutu le likoting tsa kutu li ile tsa eketseha.Sena se bontša hore mocheso oa synergistic corrosion tikoloho o na le tšusumetso e kholo ho thepa ea mechine ea liboutu tse matla, tse sa totobalang ka mocheso oa kamore, empa ke tsa bohlokoa haholo ha mocheso o fihla ho 50 ° C.
Ka mor'a hore teko ea ka tlung e potlakisang ho bola e ts'oane le tikoloho ea sepakapaka ea Chongqing, matla a tsitsitseng, matla a tlhahiso, bolelele le likarolo tse ling tsa liboutu tse matla tse phahameng tsa 20MnTiB li ile tsa fokotsoa, ​​'me tšenyo e totobetseng ea khatello ea kelello e etsahetse. likoting, ho bonolo ho baka tšenyo e hlakileng ea polasetiki ho liboutu tse matla, ho fokotsa bokhoni ba ho hanela deformation ka matla a kantle, le ho eketsa tšekamelo ea ho bola ha khatello ea maikutlo.
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