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20MnTiB hlau yog cov khoom siv ntsia hlau muaj zog tshaj plaws rau cov choj hlau hauv kuv lub tebchaws, thiab nws qhov kev ua tau zoo yog qhov tseem ceeb rau kev ua haujlwm zoo ntawm cov choj. Raws li kev tshawb nrhiav ntawm qhov chaw ib puag ncig hauv Chongqing, txoj kev tshawb fawb no tau tsim cov tshuaj xeb uas ua piv txwv rau huab cua noo ntawm Chongqing, thiab ua cov kev sim xeb ntawm cov ntsia hlau muaj zog uas ua piv txwv rau huab cua noo ntawm Chongqing. Cov teebmeem ntawm qhov kub thiab txias, tus nqi pH thiab kev sim xeb ntawm cov tshuaj xeb rau kev coj cwj pwm xeb ntawm 20MnTiB cov ntsia hlau muaj zog tau kawm.
20MnTiB hlau yog cov khoom siv ntsia hlau muaj zog tshaj plaws rau cov choj hlau hauv kuv lub tebchaws, thiab nws qhov kev ua tau zoo yog qhov tseem ceeb rau kev ua haujlwm zoo ntawm cov choj.Li et al. 1 tau sim cov khoom ntawm 20MnTiB hlau feem ntau siv hauv qib 10.9 lub zog siab bolts hauv qhov kub siab ntawm 20 ~ 700 ℃, thiab tau txais cov kab nkhaus kev ntxhov siab, lub zog tawm los, lub zog tensile, Young's modulus, thiab elongation. thiab coefficient nthuav dav.Zhang et al. 2, Hu et al. 3, thiab lwm yam, los ntawm kev sim tshuaj lom neeg, kev sim khoom siv kho tshuab, kev sim microstructure, kev tshuaj xyuas macroscopic thiab microscopic ntawm qhov chaw xov, thiab cov txiaj ntsig qhia tau tias qhov laj thawj tseem ceeb rau kev tawg ntawm cov ntsia hlau muaj zog siab yog cuam tshuam nrog cov xov tsis zoo, thiab qhov tshwm sim ntawm cov xov tsis zoo Cov kev ntxhov siab loj, cov kev ntxhov siab tawg thiab cov xwm txheej xeb qhib-cua txhua yam ua rau muaj kev ntxhov siab xeb tawg.
Cov ntsia hlau muaj zog heev rau cov choj hlau feem ntau siv ntev heev hauv qhov chaw noo noo. Tej yam xws li av noo siab, kub siab, thiab kev tso dej thiab kev nqus cov tshuaj lom neeg hauv ib puag ncig tuaj yeem ua rau cov qauv hlau xeb tau yooj yim. Kev xeb tuaj yeem ua rau lub zog siab ntawm cov ntsia hlau hla kev poob, ua rau muaj ntau qhov tsis zoo thiab tawg. Thiab cov qhov tsis zoo thiab tawg no yuav txuas ntxiv nthuav dav, yog li txo lub neej ntawm cov ntsia hlau muaj zog thiab txawm tias ua rau lawv tawg. Txog tam sim no, muaj ntau txoj kev tshawb fawb txog qhov cuam tshuam ntawm kev xeb ib puag ncig rau kev ua haujlwm ntawm kev ntxhov siab ntawm cov ntaub ntawv. Catar et al4 tau tshawb xyuas tus cwj pwm ntxhov siab ntawm cov hlau nplaum magnesium nrog cov ntsiab lus txhuas sib txawv hauv cov chaw acidic, alkaline thiab nruab nrab los ntawm kev sim qeeb qeeb (SSRT). Abdel et al.5 tau kawm txog kev tawg ntawm electrochemical thiab kev ntxhov siab ntawm Cu10Ni alloy hauv 3.5% NaCl kua hauv qhov muaj ntau qhov sib txawv ntawm sulfide ions. Aghion et al.6 tau soj ntsuam qhov kev ua haujlwm xeb ntawm cov hlau nplaum magnesium MRI230D hauv 3.5% NaCl kua los ntawm kev sim immersion, kev sim ntsev tsuag, kev tshuaj xyuas potentiodynamic polarization thiab SSRT.Zhang et al.7 tau kawm txog kev ntxhov siab corrosion ntawm 9Cr martensitic hlau siv SSRT thiab cov txheej txheem kuaj electrochemical ib txwm muaj, thiab tau txais cov nyhuv ntawm chloride ions ntawm kev ntxhov siab corrosion ntawm martensitic hlau ntawm chav tsev kub.Chen et al.8 tau tshawb xyuas kev ntxhov siab corrosion thiab tawg mechanism ntawm X70 hlau hauv simulated hiav txwv av nkos kua uas muaj SRB ntawm ntau qhov kub los ntawm SSRT.Liu et al.9 siv SSRT los kawm txog cov nyhuv ntawm qhov kub thiab txias thiab tensile strain rate ntawm seawater kev ntxhov siab corrosion tsis kam ntawm 00Cr21Ni14Mn5Mo2N austenitic stainless hlau. Cov txiaj ntsig qhia tau tias qhov kub thiab txias hauv qhov ntau ntawm 35 ~ 65 ℃ tsis muaj qhov cuam tshuam loj rau kev ntxhov siab corrosion ntawm stainless hlau.Lu et al. 10 tau soj ntsuam qhov kev puas tsuaj qeeb ntawm cov qauv nrog cov qib sib txawv ntawm lub zog tensile los ntawm kev sim tawg qeeb thiab SSRT. Nws tau hais tias lub zog tensile ntawm 20MnTiB hlau thiab 35VB hlau lub zog siab bolts yuav tsum tau tswj ntawm 1040-1190MPa. Txawm li cas los xij, feem ntau ntawm cov kev tshawb fawb no feem ntau siv cov tshuaj NaCl yooj yim 3.5% los ua qauv qhia txog qhov chaw corrosive, thaum qhov chaw siv tiag tiag ntawm cov bolts muaj zog siab yog qhov nyuaj dua thiab muaj ntau yam cuam tshuam, xws li tus nqi pH ntawm bolt. Ananya et al. 11 tau kawm txog cov nyhuv ntawm cov yam ntxwv ib puag ncig thiab cov ntaub ntawv hauv cov khoom siv corrosive ntawm kev xeb thiab kev ntxhov siab corrosion tawg ntawm duplex stainless hlau. Sunada et al. 12 tau ua qhov kev sim tawg ntawm qhov kub thiab txias ntawm chav tsev ntawm SUS304 hlau hauv cov kua dej uas muaj H2SO4 (0-5.5 kmol/m-3) thiab NaCl (0-4.5 kmol/m-3). Cov teebmeem ntawm H2SO4 thiab NaCl ntawm cov hom xeb ntawm SUS304 hlau kuj tau kawm. Merwe et al.13 siv SSRT los kawm txog cov teebmeem ntawm kev dov, kub, CO2/CO concentration, roj siab thiab lub sijhawm xeb ntawm qhov kev ntxhov siab xeb ntawm A516 hlau siab. Siv cov tshuaj NS4 ua cov tshuaj simulating hauv av, Ibrahim et al.14 tau tshawb xyuas cov teebmeem ntawm cov yam ntxwv ib puag ncig xws li bicarbonate ion (HCO) concentration, pH thiab kub ntawm kev ntxhov siab xeb tawg ntawm API-X100 pipeline steel tom qab tev tawm cov txheej. Shan et al. 15 tau kawm txog txoj cai hloov pauv ntawm kev ntxhov siab corrosion cracking susceptibility ntawm austenitic stainless hlau 00Cr18Ni10 nrog qhov kub thiab txias nyob rau hauv qhov kub thiab txias sib txawv (30 ~ 250 ℃) nyob rau hauv qhov xwm txheej ntawm cov dej dub hauv cov nroj tsuag thee-rau-hydrogen simulated los ntawm SSRT. Han et al.16 tau piav qhia txog hydrogen embrittlement susceptibility ntawm cov qauv bolt muaj zog siab siv kev sim tawg dead-load qeeb thiab SSRT.Zhao17 tau kawm txog cov teebmeem ntawm pH, SO42-, Cl-1 ntawm kev ntxhov siab corrosion tus cwj pwm ntawm GH4080A alloy los ntawm SSRT. Cov txiaj ntsig qhia tau tias qhov qis dua pH tus nqi, qhov phem dua qhov kev ntxhov siab corrosion tsis kam ntawm GH4080A alloy. Nws muaj qhov pom tseeb kev ntxhov siab corrosion rhiab heev rau Cl-1, thiab tsis rhiab heev rau SO42-ionic nruab nrab ntawm chav tsev kub. Txawm li cas los xij, muaj ob peb txoj kev tshawb fawb txog cov teebmeem ntawm kev xeb ib puag ncig ntawm 20MnTiB steel high-strength bolts.
Yuav kom nrhiav tau cov laj thawj rau qhov ua tsis tiav ntawm cov ntsia hlau muaj zog siv hauv cov choj, tus sau tau ua ntau txoj kev tshawb fawb. Cov qauv ntsia hlau muaj zog siab tau raug xaiv, thiab cov laj thawj rau qhov ua tsis tiav ntawm cov qauv no tau tham txog los ntawm kev xav ntawm cov tshuaj lom neeg sib xyaw, cov qauv tawg me me, cov qauv metallographic thiab kev tshuaj xyuas cov khoom siv kho tshuab19, 20. Raws li kev tshawb nrhiav ntawm qhov chaw ib puag ncig hauv Chongqing hauv xyoo tas los no, ib txoj kev npaj xeb uas ua piv txwv rau huab cua noo ntawm Chongqing tau tsim. Kev sim xeb kev ntxhov siab, kev sim xeb electrochemical thiab kev sim xeb qaug zog ntawm cov ntsia hlau muaj zog siab hauv Chongqing simulated huab cua noo tau raug ua tiav. Hauv txoj kev tshawb fawb no, cov teebmeem ntawm qhov kub thiab txias, tus nqi pH thiab kev sib xyaw ntawm cov tshuaj xeb simulated rau tus cwj pwm xeb kev ntxhov siab ntawm 20MnTiB cov ntsia hlau muaj zog siab tau raug tshuaj xyuas los ntawm kev sim cov khoom siv kho tshuab, kev tshuaj xyuas tawg macroscopic thiab microscopic, thiab cov khoom xeb saum npoo.
Chongqing nyob rau sab qab teb sab hnub poob ntawm Suav teb, thaj chaw siab tshaj plaws ntawm tus dej Yangtze, thiab muaj huab cua noo noo subtropical monsoon. Qhov kub nruab nrab txhua xyoo yog 16-18 ° C, qhov nruab nrab txhua xyoo av noo feem ntau yog 70-80%, lub sijhawm hnub ci txhua xyoo yog 1000-1400 teev, thiab feem pua ​​​​​​ntawm hnub ci tsuas yog 25-35%.
Raws li cov ntawv ceeb toom txog lub hnub ci thiab qhov kub thiab txias hauv Chongqing txij xyoo 2015 txog 2018, qhov nruab nrab txhua hnub kub hauv Chongqing yog qis li 17 ° C thiab siab txog 23 ° C. Qhov kub siab tshaj plaws ntawm lub cev choj ntawm Chaotianmen Choj hauv Chongqing tuaj yeem ncav cuag 50 ° C ° C21,22. Yog li ntawd, cov qib kub rau kev sim xeb kev ntxhov siab tau teeb tsa ntawm 25 ° C thiab 50 ° C.
Tus nqi pH ntawm cov tshuaj xeb simulated ncaj qha txiav txim siab qhov ntau ntawm H +, tab sis nws tsis tau txhais hais tias qhov pH qis dua, qhov yooj yim xeb tshwm sim. Qhov cuam tshuam ntawm pH rau cov txiaj ntsig yuav txawv rau cov ntaub ntawv sib txawv thiab cov tshuaj. Txhawm rau kom kawm tau zoo dua txog qhov cuam tshuam ntawm cov tshuaj xeb simulated rau kev ua haujlwm ntawm kev ntxhov siab corrosion ntawm cov bolts muaj zog siab, cov nqi pH ntawm kev sim xeb kev ntxhov siab tau teeb tsa rau 3.5, 5.5 thiab 7.5 ua ke nrog kev tshawb fawb txog cov ntaub ntawv23 thiab pH ntau ntawm cov dej nag txhua xyoo hauv Chongqing.2010 txog 2018.
Qhov siab dua qhov concentration ntawm cov tshuaj xeb simulated, qhov ntau dua cov ion nyob rau hauv cov tshuaj xeb simulated, thiab qhov ntau dua qhov cuam tshuam rau cov khoom siv. Txhawm rau kawm txog qhov cuam tshuam ntawm cov tshuaj xeb simulated concentration ntawm kev ntxhov siab corrosion ntawm cov bolts muaj zog siab, kev sim tshuaj xeb sai sai hauv chaw soj nstuam tau paub, thiab qhov concentration ntawm cov tshuaj xeb simulated tau teeb tsa rau qib 4 yam tsis muaj xeb, uas yog qhov concentration ntawm cov tshuaj xeb simulated thawj (1 ×), 20 × qhov concentration ntawm cov tshuaj xeb simulated thawj (20 ×) thiab 200 × qhov concentration ntawm cov tshuaj xeb simulated thawj (200 ×).
Ib puag ncig nrog qhov kub ntawm 25 ℃, pH tus nqi ntawm 5.5, thiab qhov concentration ntawm cov tshuaj xeb qub yog qhov ze tshaj plaws rau cov xwm txheej siv tiag tiag ntawm cov ntsia hlau muaj zog siab rau cov choj. Txawm li cas los xij, txhawm rau kom ua kom cov txheej txheem kuaj xeb sai dua, cov xwm txheej sim nrog qhov kub ntawm 25 ° C, pH ntawm 5.5 thiab qhov concentration ntawm 200 × cov tshuaj xeb qub tau teeb tsa ua pawg tswj hwm. Thaum cov teebmeem ntawm qhov kub, concentration lossis pH tus nqi ntawm cov tshuaj xeb qub rau kev ua haujlwm xeb ntawm cov ntsia hlau muaj zog siab tau tshawb xyuas, lwm yam tseem tsis hloov pauv, uas tau siv ua qib sim ntawm pawg tswj hwm.
Raws li xyoo 2010-2018 cov lus qhia txog qhov zoo ntawm ib puag ncig huab cua uas tau tshaj tawm los ntawm Chongqing Municipal Bureau of Ecology and Environment, thiab xa mus rau cov khoom siv nag lossis daus uas tau tshaj tawm hauv Zhang24 thiab lwm cov ntaub ntawv tau tshaj tawm hauv Chongqing, cov tshuaj xeb simulated raws li kev nce qhov concentration ntawm SO42- tau tsim. Cov khoom sib xyaw ntawm cov nag lossis daus hauv thaj chaw nroog loj ntawm Chongqing hauv xyoo 2017. Cov khoom sib xyaw ntawm cov tshuaj xeb simulated tau qhia hauv Rooj 1:
Cov tshuaj xeb simulated yog npaj los ntawm cov tshuaj ion concentration balance method siv cov analytical reagents thiab dej distilled. Tus nqi pH ntawm cov tshuaj xeb simulated tau kho nrog lub ntsuas pH precision, cov tshuaj nitric acid thiab cov tshuaj sodium hydroxide.
Yuav kom ua piv txwv txog huab cua noo hauv Chongqing, lub tshuab ntsuas ntsev tau raug hloov kho thiab tsim tshwj xeeb 25. Raws li pom hauv Daim Duab 1, cov khoom siv sim muaj ob lub tshuab: lub tshuab ntsuas ntsev thiab lub teeb pom kev zoo. Lub tshuab ntsuas ntsev yog lub luag haujlwm tseem ceeb ntawm cov khoom siv sim, uas muaj ib feem tswj, ib feem tshuaj tsuag thiab ib feem induction. Lub luag haujlwm ntawm qhov tshuaj tsuag yog los tso cov pa ntsev rau hauv chav kuaj los ntawm lub tshuab cua compressor. Qhov induction yog tsim los ntawm cov khoom ntsuas kub, uas ntsuas qhov kub hauv chav kuaj. Qhov tswj yog tsim los ntawm lub microcomputer, uas txuas qhov tshuaj tsuag thiab qhov induction los tswj tag nrho cov txheej txheem sim. Lub tshuab teeb pom kev zoo tau teeb tsa hauv chav kuaj ntsev los ua piv txwv txog lub hnub ci. Lub tshuab teeb pom kev zoo muaj cov teeb infrared thiab lub tshuab tswj lub sijhawm. Tib lub sijhawm, lub ntsuas kub tau teeb tsa hauv chav kuaj ntsev los saib xyuas qhov kub nyob ib puag ncig cov qauv hauv lub sijhawm tiag tiag.
Cov qauv xeb kev ntxhov siab nyob rau hauv qhov kev thauj khoom tas li tau ua tiav raws li NACETM0177-2005 (Kev Kuaj Xyuas Hauv Chaw Kuaj Mob ntawm Sulfide Stress Cracking thiab Stress Corrosion Cracking Resistance ntawm Cov Hlau hauv H2S Ib puag ncig). Cov qauv xeb kev ntxhov siab tau ntxuav ua ntej nrog acetone thiab ultrasonic mechanical cleaning kom tshem tawm cov roj seem, tom qab ntawd dehydrated nrog cawv thiab ziab hauv qhov cub. Tom qab ntawd muab cov qauv huv si rau hauv chav kuaj ntawm lub cuab yeej ntsuas ntsev tsuag kom ua piv txwv qhov xwm txheej xeb hauv qhov chaw huab cua noo ntawm Chongqing. Raws li tus qauv NACETM0177-2005 thiab tus qauv ntsuas ntsev tsuag GB / T 10,125-2012, lub sijhawm kuaj xeb kev ntxhov siab tas li hauv kev tshawb fawb no tau txiav txim siab sib npaug li 168 teev. Kev ntsuam xyuas tensile tau ua tiav rau cov qauv xeb nyob rau hauv cov xwm txheej xeb sib txawv ntawm MTS-810 universal tensile kuaj tshuab, thiab lawv cov khoom siv kho tshuab thiab cov qauv xeb tawg tau raug tshuaj xyuas.
Daim Duab 1 qhia txog qhov loj thiab me ntawm qhov xeb ntawm qhov chaw ntawm cov qauv xeb muaj zog siab nyob rau hauv cov xwm txheej xeb sib txawv.2 thiab 3 feem.
Macroscopic morphology ntawm kev ntxhov siab corrosion qauv ntawm 20MnTiB high-strength bolts nyob rau hauv ntau yam simulated corrosion ib puag ncig: (a) tsis muaj corrosion; (b) 1 zaug; (c) 20 ×; (d) 200 ×; (e) pH3.5; (f) pH 7.5; (g) 50 ° C.
Micromorphology ntawm cov khoom xeb ntawm 20MnTiB lub zog siab bolts hauv ntau qhov chaw xeb simulated (100 ×): (a) 1 zaug; (b) 20 ×; (c) 200 ×; (d) pH3.5; (e) pH7 .5; (f) 50 ° C.
Los ntawm daim duab 2a, koj pom tau tias qhov chaw ntawm cov qauv ntsia hlau uas tsis muaj xeb thiab muaj zog heev ua rau pom kev ci ntsa iab yam tsis muaj xeb pom tseeb. Txawm li cas los xij, nyob rau hauv qhov xwm txheej ntawm cov tshuaj xeb qub (Daim duab 2b), qhov chaw ntawm cov qauv tau npog ib feem nrog cov khoom xeb xim av thiab xim av-liab, thiab qee qhov chaw ntawm qhov chaw tseem pom kev ci ntsa iab, qhia tias tsuas yog qee qhov chaw ntawm qhov chaw ntawm cov qauv tau xeb me ntsis, thiab cov tshuaj xeb simulated tsis muaj kev cuam tshuam rau qhov chaw ntawm cov qauv. Cov khoom siv tsis muaj txiaj ntsig ntau. Txawm li cas los xij, nyob rau hauv qhov xwm txheej ntawm 20 × thawj qhov kev daws teeb meem xeb (Daim Duab 2c), qhov chaw ntawm cov qauv ntsia hlau muaj zog siab tau raug npog tag nrho los ntawm ntau cov khoom xeb xim av thiab me me ntawm cov xeb xim av-liab. khoom, tsis pom muaj cov xim hlau ci ntsa iab, thiab muaj me me ntawm cov khoom xeb xim av-dub ze ntawm qhov chaw ntawm lub substrate. Thiab nyob rau hauv qhov xwm txheej ntawm 200 × thawj qhov kev daws teeb meem xeb (Daim Duab 2d), qhov chaw ntawm cov qauv tau npog tag nrho los ntawm cov khoom xeb xim av, thiab cov khoom xeb xim av-dub tshwm sim hauv qee thaj chaw.
Thaum pH txo qis mus rau 3.5 (Daim Duab 2e), cov khoom xeb xim av daj feem ntau nyob rau ntawm qhov chaw ntawm cov qauv, thiab qee cov khoom xeb tau raug tshem tawm.
Daim Duab 2g qhia tau hais tias thaum qhov kub nce mus txog 50 °C, cov ntsiab lus ntawm cov khoom xeb xim av-liab ntawm qhov chaw ntawm cov qauv txo qis, thaum cov khoom xeb xim av ci ntsa iab npog qhov chaw ntawm cov qauv hauv thaj chaw loj. Cov txheej khoom xeb yog qhov xoob me ntsis, thiab qee cov khoom xim av-dub raug tev tawm.
Raws li pom hauv Daim Duab 3, nyob rau hauv qhov chaw sib txawv corrosion, cov khoom corrosion ntawm qhov chaw ntawm 20MnTiB high-strength bolt stress corrosion qauv yog pom tseeb delaminated, thiab qhov tuab ntawm cov txheej corrosion nce nrog rau qhov nce ntawm qhov concentration ntawm cov tshuaj corrosion simulated. Nyob rau hauv qhov xwm txheej ntawm cov tshuaj corrosion simulated thawj (Daim Duab 3a), cov khoom corrosion ntawm qhov chaw ntawm cov qauv tuaj yeem faib ua ob txheej: txheej sab nraud ntawm cov khoom corrosion yog faib sib npaug, tab sis ntau qhov tawg tshwm sim; txheej sab hauv yog ib pawg xoob ntawm cov khoom corrosion. Nyob rau hauv qhov xwm txheej ntawm 20 × thawj simulated corrosion tshuaj concentration (Daim Duab 3b), txheej corrosion ntawm qhov chaw ntawm cov qauv tuaj yeem faib ua peb txheej: txheej sab nraud yog feem ntau dispersed cluster corrosion khoom, uas yog xoob thiab porous, thiab tsis muaj kev ua tau zoo tiv thaiv; Txheej nruab nrab yog ib txheej khoom corrosion sib xws, tab sis muaj cov tawg pom tseeb, thiab cov corrosion ions tuaj yeem hla dhau cov kab nrib pleb thiab erode lub substrate; Cov txheej sab hauv yog cov khoom siv xeb uas tuab thiab tsis muaj qhov tawg, uas muaj kev tiv thaiv zoo rau lub substrate. Nyob rau hauv qhov xwm txheej ntawm 200 × thawj qhov kev daws teeb meem xeb simulated (Daim duab 3c), cov txheej xeb ntawm qhov chaw ntawm cov qauv tuaj yeem faib ua peb txheej: cov txheej sab nraud yog cov khoom siv xeb nyias thiab sib xws; cov txheej nruab nrab feem ntau yog cov duab paj thiab cov duab flake Cov txheej sab hauv yog cov khoom siv xeb uas tuab thiab tsis muaj qhov tawg thiab qhov pom tseeb, uas muaj kev tiv thaiv zoo rau lub substrate.
Nws tuaj yeem pom los ntawm daim duab 3d tias nyob rau hauv qhov chaw xeb simulated ntawm pH 3.5, muaj ntau cov khoom xeb flocculent lossis koob zoo li koob rau ntawm qhov chaw ntawm 20MnTiB lub zog siab bolt qauv. Nws tau xav tias cov khoom xeb no feem ntau yog γ-FeOOH thiab me me ntawm α-FeOOH interlaced26, thiab cov txheej xeb muaj cov kab nrib pleb pom tseeb.
Los ntawm daim duab 3f, thaum qhov kub nce mus txog 50 °C, tsis pom muaj txheej xeb sab hauv uas pom tseeb hauv cov qauv txheej xeb, qhia tias muaj qhov sib txawv ntawm cov txheej xeb ntawm 50 °C, uas ua rau lub substrate tsis npog tag nrho los ntawm cov khoom xeb. Muab kev tiv thaiv tiv thaiv kev nce ntxiv ntawm cov substrate corrosion.
Cov khoom siv kho tshuab ntawm cov bolts muaj zog siab nyob rau hauv qhov kev ntxhov siab tas li ntawm kev xeb hauv ntau qhov chaw corrosive tau qhia nyob rau hauv Rooj 2:
Los ntawm Rooj 2, peb pom tau tias cov khoom siv kho tshuab ntawm 20MnTiB lub zog siab tseem ua tau raws li cov qauv kev cai tom qab lub voj voog qhuav-ntub ceev ceev hauv ntau qhov chaw xeb simulated, tab sis muaj qee qhov kev puas tsuaj piv rau cov tsis xeb. qauv. Ntawm qhov concentration ntawm cov tshuaj xeb simulated thawj, cov khoom siv kho tshuab ntawm cov qauv tsis hloov pauv ntau, tab sis ntawm qhov concentration 20 × lossis 200 × ntawm cov tshuaj simulated, qhov ntev ntawm cov qauv txo qis ntau. Cov khoom siv kho tshuab zoo sib xws ntawm qhov concentration ntawm 20 × thiab 200 × cov tshuaj xeb simulated thawj. Thaum tus nqi pH ntawm cov tshuaj xeb simulated poob rau 3.5, lub zog tensile thiab elongation ntawm cov qauv txo qis ntau. Thaum qhov kub nce mus txog 50 ° C, lub zog tensile thiab elongation txo qis ntau, thiab thaj chaw shrinkage tus nqi ze rau tus nqi txheem.
Cov qauv tawg ntawm 20MnTiB lub zog siab bolt stress corrosion qauv nyob rau hauv ntau qhov chaw corrosion tau qhia nyob rau hauv Daim Duab 4, uas yog macro-morphology ntawm qhov tawg, thaj chaw fiber nyob rau hauv qhov chaw ntawm qhov tawg, daim di ncauj micro-morphological ntawm lub shear interface, thiab qhov chaw ntawm cov qauv.
Cov qauv tawg ntawm 20MnTiB uas muaj zog heev hauv ntau qhov chaw xeb sib txawv (500 ×): (a) tsis muaj xeb; (b) 1 zaug; (c) 20 ×; (d) 200 ×; (e) pH3.5; (f) pH7.5; (g) 50°C.
Los ntawm daim duab 4, koj tuaj yeem pom tias qhov tawg ntawm 20MnTiB lub zog siab bolt stress corrosion qauv nyob rau hauv ntau qhov chaw sib txawv ntawm kev xeb ua piv txwv qhia txog qhov tawg ntawm lub khob-cone. Piv nrog rau cov qauv tsis xeb (Daim duab 4a), thaj chaw nruab nrab ntawm thaj chaw fiber tawg yog qhov me me. , thaj chaw shear lip loj dua. Qhov no qhia tau hais tias cov khoom siv kho tshuab ntawm cov khoom siv raug puas tsuaj ntau tom qab xeb. Nrog rau kev nce ntawm qhov kev daws teeb meem corrosion simulated, cov qhov hauv thaj chaw fiber hauv nruab nrab ntawm qhov tawg tau nce ntxiv, thiab cov seams tear pom tseeb tshwm sim. Thaum qhov kev sib xyaw nce mus txog 20 npaug ntawm cov tshuaj corrosion simulated thawj, cov qhov corrosion pom tseeb tshwm sim ntawm qhov sib txuas ntawm ntug shear lip thiab qhov chaw ntawm cov qauv, thiab muaj ntau cov khoom xeb ntawm qhov chaw.
Los ntawm Daim Duab 3d, nws tau xaus lus tias muaj cov kab nrib pleb pom tseeb hauv cov txheej xeb ntawm qhov chaw ntawm cov qauv, uas tsis muaj kev tiv thaiv zoo rau lub matrix. Hauv cov tshuaj xeb simulated ntawm pH 3.5 (Daim Duab 4e), qhov chaw ntawm cov qauv raug xeb heev, thiab thaj chaw fiber nruab nrab yog qhov me me. , Muaj ntau cov kab sib txuas tsis sib xws hauv nruab nrab ntawm thaj chaw fiber. Nrog rau qhov nce ntawm tus nqi pH ntawm cov tshuaj xeb simulated, thaj chaw tsim kua muag hauv thaj chaw fiber hauv nruab nrab ntawm qhov tawg txo qis, qhov av maj mam txo qis, thiab qhov tob ntawm qhov av kuj txo qis maj mam.
Thaum qhov kub nce mus txog 50 ° C (Daim Duab 4g), thaj tsam ntawm qhov tawg ntawm cov qauv yog qhov loj tshaj plaws, cov qhov hauv thaj chaw fiber nruab nrab nce ntxiv ntau, thiab qhov tob ntawm qhov kuj nce ntxiv, thiab qhov sib txuas ntawm ntug ntawm qhov txiav thiab qhov chaw ntawm cov qauv nce ntxiv. Cov khoom xeb thiab cov qhov av nce ntxiv, uas lees paub qhov sib txawv ntawm kev xeb ntawm cov khoom siv hauv av uas pom hauv Daim Duab 3f.
Tus nqi pH ntawm cov tshuaj xeb yuav ua rau muaj kev puas tsuaj rau cov khoom siv kho tshuab ntawm 20MnTiB lub zog siab, tab sis qhov cuam tshuam tsis tseem ceeb. Hauv cov tshuaj xeb ntawm pH 3.5, ntau cov khoom xeb flocculent lossis koob zoo li koob tau faib rau ntawm qhov chaw ntawm cov qauv, thiab cov txheej xeb muaj cov kab nrib pleb pom tseeb, uas tsis tuaj yeem tsim kev tiv thaiv zoo rau lub substrate. Thiab muaj cov qhov xeb pom tseeb thiab ntau cov khoom xeb hauv cov qauv me me ntawm qhov tawg ntawm cov qauv. Qhov no qhia tau hais tias lub peev xwm ntawm cov qauv los tiv thaiv kev hloov pauv los ntawm lub zog sab nraud tau txo qis hauv ib puag ncig acidic, thiab qib ntawm kev ntxhov siab xeb ntawm cov khoom siv tau nce ntxiv.
Cov tshuaj xeb qub uas tau simulated tsis muaj feem cuam tshuam rau cov khoom siv kho tshuab ntawm cov qauv ntsia hlau muaj zog siab, tab sis raws li qhov concentration ntawm cov tshuaj xeb uas tau simulated nce mus txog 20 npaug ntawm cov tshuaj xeb qub uas tau simulated, cov khoom siv kho tshuab ntawm cov qauv tau puas tsuaj ntau heev, thiab muaj qhov xeb pom tseeb hauv qhov tawg microstructure. cov qhov, cov kab nrib pleb thib ob thiab ntau cov khoom xeb. Thaum qhov concentration ntawm cov tshuaj xeb uas tau simulated tau nce ntxiv los ntawm 20 npaug mus rau 200 npaug ntawm qhov concentration ntawm cov tshuaj xeb uas tau simulated thawj, qhov cuam tshuam ntawm qhov concentration ntawm cov tshuaj xeb rau cov khoom siv kho tshuab ntawm cov khoom tau qaug zog.
Thaum qhov kub ntawm qhov xeb simulated yog 25 ℃, lub zog yield thiab tensile ntawm 20MnTiB high-strength bolt qauv tsis hloov pauv ntau piv rau cov qauv tsis muaj corroded. Txawm li cas los xij, nyob rau hauv qhov kub ntawm qhov xeb simulated ntawm 50 ° C, lub zog tensile thiab elongation ntawm cov qauv txo qis, qhov seem shrinkage tus nqi ze rau tus nqi txheem, qhov tawg shear daim di ncauj yog qhov loj tshaj plaws, thiab muaj dimples hauv thaj chaw fiber nruab nrab. Nce ntxiv, qhov tob ntawm qhov av nce ntxiv, cov khoom xeb thiab cov qhov xeb nce ntxiv. Qhov no qhia tau hais tias qhov kub synergistic corrosion ib puag ncig muaj kev cuam tshuam loj rau cov khoom siv kho tshuab ntawm cov bolts muaj zog siab, uas tsis pom tseeb ntawm chav tsev kub, tab sis tseem ceeb dua thaum qhov kub ncav cuag 50 ° C.
Tom qab kev sim xeb sab hauv tsev uas ua piv txwv rau qhov chaw ib puag ncig hauv Chongqing, lub zog tensile, lub zog yield, elongation thiab lwm yam kev ntsuas ntawm 20MnTiB lub zog siab bolts tau txo qis, thiab kev puas tsuaj ntawm kev ntxhov siab pom tseeb tshwm sim. Txij li thaum cov khoom siv nyob rau hauv kev ntxhov siab, yuav muaj qhov tshwm sim ntawm kev xeb hauv zos tseem ceeb. Thiab vim muaj kev sib xyaw ua ke ntawm kev ntxhov siab concentration thiab corrosion pits, nws yooj yim ua rau muaj kev puas tsuaj yas rau cov bolts muaj zog siab, txo qhov muaj peev xwm tiv taus deformation los ntawm cov rog sab nraud, thiab ua rau muaj kev ntxhov siab corrosion.
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