Ua tsaug rau koj tuaj xyuas Nature.com.Qhov browser version koj siv tau txwv kev txhawb nqa rau CSS.Rau qhov kev paub zoo tshaj plaws, peb xav kom koj siv qhov browser tshiab (lossis kaw qhov kev sib raug zoo hauv Internet Explorer).
20MnTiB steel yog cov khoom siv dav siv lub zog siab tshaj plaws rau steel qauv txuas hniav hauv kuv lub tebchaws, thiab nws qhov kev ua tau zoo yog qhov tseem ceeb rau kev ua haujlwm ruaj ntseg ntawm cov choj.Raws li kev tshawb nrhiav ntawm huab cua puag ncig hauv Chongqing, txoj kev tshawb no tau tsim cov tshuaj tiv thaiv corrosion simulating cov huab cua ntub ntawm Chongqing, thiab nqa tawm cov kev kub ntxhov siab ntawm kev kub ntxhov ntawm Chongqing. .Qhov cuam tshuam ntawm qhov kub thiab txias, pH tus nqi thiab simulated corrosion kua concentration ntawm kev ntxhov siab corrosion tus cwj pwm ntawm 20MnTiB high-strength bolts tau kawm.
20MnTiB steel yog cov khoom siv dav siv lub zog siab tshaj plaws rau steel qauv txuas hniav hauv kuv lub teb chaws, thiab nws qhov kev ua tau zoo yog qhov tseem ceeb rau kev ua haujlwm ruaj ntseg ntawm choj.Li li al.1 kuaj cov khoom ntawm 20MnTiB steel feem ntau siv nyob rau hauv qib 10.9 high-strength bolts nyob rau hauv qhov kub thiab txias ntawm 20 ~ 700 ℃, thiab tau txais cov kev ntxhov siab-strain nkhaus, yield zog, tensile zog, Young's modulus, thiab elongation.thiab expansion coefficient.Zhang et al.2, Hu et al.3, thiab lwm yam, los ntawm kev ntsuam xyuas cov tshuaj lom neeg, kev ntsuam xyuas cov cuab yeej, kev kuaj microstructure, macroscopic thiab microscopic tsom xam ntawm cov xov nto, thiab cov txiaj ntsig tau pom tias yog vim li cas qhov tseem ceeb ntawm kev tawg ntawm lub zog muaj zog bolts muaj feem xyuam rau cov xov tsis xws luag, thiab qhov tshwm sim ntawm xov tsis xws luag loj kev nyuaj siab ntau, tawg ntswj kev nyuaj siab concentrations thiab qhib-cua corrosive tej yam kev mob.
High-strength bolts rau steel choj feem ntau yog siv rau ib ntev lub sij hawm nyob rau hauv ib tug ntub ib puag ncig.Cov yam ntxwv xws li high humidity, siab kub, thiab cov sedimentation thiab nqus cov teeb meem nyob rau hauv ib puag ncig yuav yooj yim ua rau corrosion ntawm steel lug.Corrosion yuav ua rau high-strength bolt bolt poob, uas ua rau muaj ntau yam tsis xws luag thiab stabilizes lub neej. ength bolts thiab txawm ua rau lawv tawg.Txog tam sim no, muaj ntau yam kev tshawb fawb txog kev cuam tshuam ntawm ib puag ncig corrosion ntawm kev ntxhov siab corrosion ntawm cov ntaub ntawv.Catar thiab al4 tau tshawb xyuas cov kev ntxhov siab corrosion ntawm magnesium alloys nrog cov ntsiab lus txhuas sib txawv hauv acidic, alkaline thiab nruab nrab ib puag ncig los ntawm kev ntsuas qeeb qeeb (SSRT). ntawm sulfide ions.Aghion et al.6 tau soj ntsuam qhov kev ua tau zoo ntawm corrosion ntawm tuag-cam khwb cia magnesium alloy MRI230D nyob rau hauv 3.5% NaCl tov los ntawm immersion test, ntsev tsuag tshuaj ntsuam xyuas, potentiodynamic polarization tsom xam thiab SSRT.Zhang li al.7 kawm txog kev ntxhov siab corrosion tus cwj pwm ntawm 9Cr martensitic steel siv SSRTs cov tshuaj chlortic static siv cov txheej txheem ntawm cov tshuaj chloride thiab cov tshuaj static. steel nyob rau hauv chav tsev kub.Chen li al.8 soj ntsuam cov kev ntxhov siab corrosion tus cwj pwm thiab cracking mechanism ntawm X70 steel nyob rau hauv simulated hiav txwv av nkos tov uas muaj SRB ntawm txawv kub los ntawm SSRT.Liu li al.9 siv SSRT los kawm txog qhov kub thiab tensile strain tus nqi ntawm seawater kev nyuaj siab corrosion kuj ntawm 00Cr21Ni14N2 aM. 5 ℃ tsis muaj qhov cuam tshuam loj rau kev ntxhov siab corrosion ntawm stainless hlau.Lu li al.10 tau soj ntsuam qhov ncua sij hawm puas ntawm cov qauv nrog cov qib tensile sib txawv los ntawm kev tuag ncua kev sib tsoo pob txha thiab SSRT.Nws tau pom tias lub zog tensile ntawm 20MnTiB steel thiab 35VB steel high-strength bolts yuav tsum tau tswj ntawm 1040-1190MPa yooj yim cov kev tshawb fawb feem ntau ntawm cov kev daws teeb meem ntawm 1040-1190MPa. lub corrosive ib puag ncig, thaum lub sij hawm siv tiag tiag ib puag ncig ntawm high-strength bolts yog complex thiab muaj ntau yam influencing yam, xws li tus nqi pH ntawm bolt.Ananya li al.11 tau kawm txog cov txiaj ntsig ntawm ib puag ncig tsis zoo thiab cov khoom siv hauv nruab nrab corrosive ntawm corrosion thiab kev nyuaj siab corrosion cracking ntawm duplex stainless hlaus.Sunada li al.12 tau ua qhov kev ntsuam xyuas qhov kub thiab txias ntawm SUS304 steel hauv cov tshuaj aqueous uas muaj H2SO4 (0-5.5 kmol / m-3) thiab NaCl (0-4.5 kmol / m-3).Qhov cuam tshuam ntawm H2SO4 thiab NaCl ntawm cov corrosion ntawm SUS304 steel kuj tau kawm.Merwe li al. Lub sij hawm ntawm kev ntxhov siab corrosion susceptibility ntawm A516 siab nkoj steel.Sing NS4 tov raws li ib tug av simulating tov, Ibrahim li al.14 tshawb xyuas cov txiaj ntsig ntawm ib puag ncig tsis xws li bicarbonate ion (HCO) concentration, pH thiab kub ntawm kev ntxhov siab corrosion tawg ntawm API-X100 pipeline steel tom qab tev tawm ntawm txheej.Shan li al.15 tau kawm txog kev hloov pauv txoj cai ntawm kev ntxhov siab corrosion cracking susceptibility ntawm austenitic stainless hlau 00Cr18Ni10 nrog kub nyob rau hauv qhov sib txawv kub tej yam kev mob (30 ~ 250 ℃) nyob rau hauv cov xwm txheej ntawm dub dej nruab nrab nyob rau hauv simulated thee-rau-hydrogen cog los ntawm SSRT.Han thiab al.16 characterized the hydrogen embrittcture of bolt-stretched testing high-stretched tests. 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 kev tshwm sim qhia tau hais tias qhov qis pH tus nqi, qhov phem corrosion kuj ntawm GH4080A alloy.Nws muaj pom tseeb kev nyuaj siab corrosion rhiab heev rau Cl-1, thiab tsis rhiab heev rau SO2 ntawm ib puag ncig kev tshawb fawb. 20MnTiB steel muaj zog bolts.
Txhawm rau kom paub tias yog vim li cas rau qhov tsis ua haujlwm ntawm lub zog siab bolts siv nyob rau hauv txuas hniav, tus sau tau ua ib qho kev tshawb fawb.High-strength bolt qauv raug xaiv, thiab cov laj thawj rau qhov tsis ua hauj lwm ntawm cov qauv no tau tham los ntawm cov kev xav ntawm cov tshuaj muaj pes tsawg leeg, tawg microscopic morphology, metallographic qauv thiab mechanical zog tsom xam ntawm ib puag ncig tsis ntev los no ntawm chhum 19. Xyoo, cov txheej txheem corrosion simulating huab cua ntawm Chongqing yog tsim.Kev nyuaj siab corrosion thwmsim, electrochemical corrosion thwmsim thiab corrosion qaug zog thwmsim ntawm high-strength bolts nyob rau hauv Chongqing simulated humid huab cua yog nqa tawm.Nyob rau hauv txoj kev tshawb no, cov teebmeem ntawm kub, pH tus nqi thiab concentration ntawm simulated corrosion daws ntawm kev nyuaj siab corrosion th bolts los ntawm cov cuab yeej high-strength 20M. macroscopic thiab microscopic tsom xam, thiab cov khoom siv corrosion nto.
Chongqing nyob rau sab hnub poob ntawm Tuam Tshoj, sab saud ntawm tus Dej Yangtze, thiab muaj huab cua sov subtropical monsoon.Qhov nruab nrab txhua xyoo yog 16-18 ° C, txhua xyoo nruab nrab cov av noo feem ntau yog 70-80%, lub hnub ci txhua xyoo yog 1000-1400 teev, thiab hnub ci tsuas yog 35%.
Raws li cov ntaub ntawv hais 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 li 23 ° C.Qhov kub siab tshaj plaws ntawm tus choj lub cev ntawm Chaotianmen Choj hauv Chongqing tuaj yeem ncav cuag 50 ° C ° C 21,22.Yog li ntawd, qhov ntsuas kub ntawm qhov ntsuas kev ntxhov siab tau teeb tsa ntawm 25 ° C thiab 50 ° C.
Tus nqi pH ntawm cov tshuaj simulated corrosion ncaj qha txiav txim siab npaum li cas ntawm H +, tab sis nws tsis txhais hais tias qhov qis pH tus nqi, qhov yooj yim corrosion tshwm sim.Cov nyhuv ntawm pH ntawm cov txiaj ntsig yuav sib txawv rau cov khoom sib txawv thiab cov kev daws teeb meem.Nyob rau kev kawm zoo dua cov nyhuv ntawm simulated corrosion daws ntawm kev nyuaj siab corrosion kev ua tau zoo ntawm high-strength bolts, pH qhov tseem ceeb 5 . research23 thiab pH ntau ntawm cov dej nag txhua xyoo hauv Chongqing.2010 txog 2018.
Qhov siab dua ntawm cov tshuaj simulated corrosion, cov ntsiab lus ion ntau dua hauv cov tshuaj simulated corrosion, thiab ntau dua qhov cuam tshuam ntawm cov khoom siv.In thiaj li kawm txog cov txiaj ntsig ntawm kev simulated corrosion tov concentration ntawm kev ntxhov siab corrosion ntawm high-strength bolts, cov khoom siv hluav taws xob kuaj nrawm dua corrosion tau pom, thiab simulated corrosion tov concentration tau teem rau qib 4 yam tsis muaj corrosion simulated, uas yog thawj cov tshuaj tiv thaiv corrosion 2 × 0, uas yog thawj qhov kev daws teeb meem. ) thiab 200 × thawj simulated corrosion kua concentration (200 ×).
Qhov ib puag ncig nrog qhov kub ntawm 25 ℃, pH tus nqi ntawm 5.5, thiab cov concentration ntawm cov thawj simulated corrosion tov yog qhov ze tshaj rau qhov tseeb siv cov xwm txheej ntawm lub zog siab bolts rau txuas hniav.Txawm li cas los xij, txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau corrosion, qhov ntsuas kub ntawm 25 ° C, qhov pH ntawm 5.5 yog qhov ze tshaj plaws rau kev siv cov txheej txheem ntawm kev siv cov bolts siab zog rau cov txuas txuas. pH tus nqi ntawm cov tshuaj simulated corrosion ntawm kev ntxhov siab corrosion kev ua tau zoo ntawm lub zog muaj zog bolts tau soj ntsuam raws li, lwm yam tseem tsis tau hloov pauv, uas tau siv los ua qib kev sim ntawm pawg tswj hwm siv.
Raws li 2010-2018 atmospheric ib puag ncig zoo cov lus piav qhia tawm los ntawm Chongqing Municipal Bureau of Ecology thiab Ib puag ncig, thiab xa mus rau cov nag xob nag cua tau tshaj tawm hauv Zhang24 thiab lwm cov ntaub ntawv qhia hauv Chongqing, simulated corrosion daws raws li kev nce siab ntawm SO42- tau tsim.Chongq 7 thaj tsam ntawm preci. Qhov sib xyaw ntawm cov tshuaj simulated corrosion yog qhia hauv Table 1:
Cov tshuaj simulated corrosion yog npaj los ntawm cov tshuaj ion concentration tshuav nyiaj li cas siv analytical reagents thiab distilled dej.Tus nqi pH ntawm simulated corrosion tov tau kho nrog precision pH meter, nitric acid tov thiab sodium hydroxide tov.
Txhawm rau simuling cov huab cua nyab xeeb hauv chongqing cov khoom siv tshuaj tsuag, yog qhov ntsuas hluav taws xob ua rau cov pa tshuaj ntxuav tes ua ntu zus ntsuas kub ntsuas, uas pom qhov ntsuas kub nyob rau hauv lub teeb sprrared.Qhov teeb tsa lub teeb pom kev zoo mus saib xyuas kub ntawm cov piv txwv hauv lub sijhawm tiag tiag.
Cov qauv kev nyuaj siab corrosion nyob rau hauv tas li load tau ua tiav raws li NACETM0177-2005 (Kev kuaj sim ntawm Sulfide Stress Cracking thiab Stress Corrosion Cracking Resistance ntawm Hlau nyob rau hauv H2S Ib puag ncig).Stress corrosion specimens tau thawj zaug ntxuav nrog acetone thiab ultrasonic mechanical tu kom tshem tawm cov roj residues, ces muab tso rau hauv qhov cub dehydrated rau hauv qhov cub. ntsev tsuag tshuaj ntsuam xyuas cov cuab yeej los simulate qhov teeb meem corrosion nyob rau hauv huab cua huab cua ib puag ncig ntawm Chongqing.Raws li tus qauv NACETM0177-2005 thiab cov ntsev tsuag tshuaj ntsuam tus qauv GB/T 10,125-2012, lub load tsis tu ncua kev nyuaj siab corrosion kuaj lub sij hawm nyob rau hauv txoj kev tshawb no yog uniformly txiav txim siab mus rau 168 h.Tensile cov kev ntsuam xyuas corrosion ntawm 10 M. Nyob rau hauv lub tshuab, thiab lawv txhua yam khoom thiab puas corrosion morphology raug soj ntsuam.
Daim duab 1 qhia cov macro- thiab micro-morphology ntawm qhov chaw corrosion ntawm high-strength bolt stress corrosion specimens nyob rau hauv txawv corrosion tej yam kev mob.2 thiab 3 raws li.
Macroscopic morphology ntawm kev nyuaj siab corrosion specimens ntawm 20MnTiB high-strength bolts nyob rau hauv txawv simulated corrosion ib puag ncig: (a) tsis muaj corrosion;(b) 1 lub sijhawm;(c) 20 ×;(d) 200 ×;(e) pH 3.5;(f) pH 7.5;(g) 50 ° C.
Micromorphology ntawm corrosion khoom ntawm 20MnTiB high-strength bolts nyob rau hauv txawv simulated corrosion ib puag ncig (100 ×): (a) 1 zaug;(b) 20 ×;(c) 200 ×;(d) pH 3.5;(e) pH 7 .5;(f) 50 ° C.
Nws tuaj yeem pom los ntawm Fig. 2a tias qhov saum npoo ntawm qhov tsis muaj zog siab bolt specimen nthuav tawm cov xim hlau ci ci yam tsis muaj qhov pom tseeb corrosion.Txawm li cas los xij, nyob rau hauv cov xwm txheej ntawm thawj simulated corrosion tov (Fig. 2b), qhov saum npoo ntawm cov qauv yog ib feem them nrog tan thiab xim av-liab corrosion cov khoom, thiab qee qhov chaw ntawm cov hlau rods tseem pom tau me ntsis ntawm cov khoom siv hlau, thiab qee qhov chaw ntawm cov khoom siv corrosive tseem pom nyob rau hauv cov qauv ntawm cov lus qhia me ntsis. cov tshuaj simulated corrosion tsis cuam tshuam rau saum npoo ntawm cov qauv.Cov khoom siv tsis tshua muaj txiaj ntsig.Txawm li cas los xij, nyob rau hauv cov xwm txheej ntawm 20 × thawj simulated corrosion kua concentration (Fig. 2c), qhov saum npoo ntawm lub zog siab bolt specimen tau raug them tag nrho los ntawm ntau cov khoom siv tan corrosion thiab ib qho me me ntawm xim av-liab corrosion.product, tsis pom muaj qhov pom tseeb ntawm cov xim hlau 2. kev daws teeb meem (Fig. 2d), qhov saum npoo ntawm cov qauv yog tag nrho los ntawm cov khoom siv xeb xim av, thiab cov khoom siv xim av-dub corrosion tshwm sim hauv qee qhov chaw.
Raws li pH poob mus rau 3.5 (Daim duab 2e), cov khoom siv tan-xim corrosion yog qhov feem ntau ntawm cov qauv, thiab qee cov khoom siv corrosion tau exfoliated.
Daim duab 2g qhia tau hais tias raws li qhov kub nce mus txog 50 ° C, cov ntsiab lus ntawm cov khoom siv xim av-liab corrosion ntawm qhov chaw ntawm cov qauv txo qis, thaum lub ci xim av corrosion cov khoom npog saum npoo ntawm cov qauv nyob rau hauv ib cheeb tsam loj.Cov khoom corrosion txheej kuj yog xoob, thiab qee cov khoom xim av-dub yog tev tawm.
Raws li pom nyob rau hauv daim duab 3, nyob rau hauv txawv corrosion ib puag ncig, cov khoom corrosion nyob rau saum npoo ntawm 20MnTiB high-strength bolt kev nyuaj siab corrosion specimens yog obviously delaminated, thiab lub thickness ntawm corrosion txheej nce nrog qhov nce ntawm cov concentration ntawm simulated corrosion tov.Raws li cov xwm txheej ntawm cov thawj simulated corrosion tov (Daim duab 3a), cov khoom siv corrosion tuaj yeem muab faib ua ob txheej txheej txheem. ly faib, tab sis muaj ntau cov kab nrib pleb tshwm;Nyob rau hauv cov xwm txheej ntawm 20 × thawj simulated corrosion tov concentration (Fig. 3b), cov txheej txheem corrosion ntawm cov qauv tuaj yeem muab faib ua peb txheej: txheej txheej sab nraud feem ntau yog dispersed pawg corrosion khoom, uas yog xoob thiab ntxeem tau, thiab tsis muaj kev tiv thaiv zoo;Cov txheej txheem nruab nrab yog txheej txheej txheej txheej corrosion, tab sis muaj cov kab nrib pleb, thiab cov ions corrosion tuaj yeem dhau los ntawm cov kab nrib pleb thiab erode lub substrate;Cov txheej sab hauv yog cov khoom siv xeb tuab yam tsis muaj qhov sib tsoo ntawm cov txheej txheem ntawm 200 × txheej txheem ntawm cov khoom siv.Cov txheej nruab nrab yog tsuas yog cov tsiaj nyeg-puab thiab flake-puab cov txheej txheej sab hauv yog cov kab nrib pleb
Nws tuaj yeem pom los ntawm daim duab 3d tias nyob rau hauv simulated corrosion ib puag ncig ntawm pH 3.5, muaj ntau cov khoom siv flocculent lossis koob zoo li cov khoom siv corrosion nyob rau saum npoo ntawm 20MnTiB siab-strength bolt specimen.Nws yog speculated tias cov khoom corrosion yog tsuas yog γ-FeOOH thiab ib tug me me txheej ntawm corrosion α-Fe.
Nws tuaj yeem pom los ntawm Daim duab 3F uas thaum kub nce ntxiv txheej txheej xeb ntawm cov txheej corrosion tau pom ntawm Corrosion Txheej Txheem ntawm 50 °Muab kev tiv thaiv tiv thaiv kom muaj zog substrate corrosion nyiam.
Cov cuab yeej cuab tam ntawm lub zog siab bolts nyob rau hauv tas li load kev nyuaj siab corrosion nyob rau hauv txawv corrosive ib puag ncig yog qhia nyob rau hauv Table 2:
Nws tuaj yeem pom los ntawm Table 2 tias cov khoom siv kho tshuab ntawm 20MnTiB cov khoom siv lub cev muaj zog tseem ua tau raws li cov qauv xav tau tom qab lub voj voog qhuav-ntub nrawm nrawm rau kev kuaj corrosion hauv qhov sib txawv simulated corrosion ib puag ncig, tab sis muaj qee yam kev puas tsuaj piv nrog cov uncorroded ones.sample.At the concentration of the original simulated corrosion solution 0 × 0 × 2. Cov tshuaj simulated, qhov elongation ntawm cov qauv txo qis heev.Cov khoom siv kho tshuab zoo ib yam ntawm cov concentrations ntawm 20 × thiab 200 × qub simulated corrosion daws.Thaum tus nqi pH ntawm cov tshuaj simulated corrosion poob mus rau 3.5, lub zog tensile thiab elongation ntawm cov qauv txo qis heev.Thaum qhov kub thiab txias ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv. ze rau tus nqi tus qauv.
Lub pob txha morphologies ntawm 20MnTiB siab-lub zog bolt kev nyuaj siab corrosion specimens nyob rau hauv txawv corrosion ib puag ncig yog qhia nyob rau hauv daim duab 4, uas yog lub macro-morphology ntawm lub pob txha, lub fiber cheeb tsam nyob rau hauv qhov chaw ntawm lub pob txha, micro-morphological di ncauj ntawm lub shear interface, thiab nto ntawm tus qauv.
Macroscopic thiab microscopic fracture morphologies ntawm 20MnTiB high-strength bolt specimens nyob rau hauv txawv simulated corrosion ib puag ncig (500 ×): (a) tsis muaj corrosion;(b) 1 lub sijhawm;(c) 20 ×;(d) 200 ×;(e) pH 3.5;(f) pH 7.5;(g) 50 ° C.
Nws tuaj yeem pom los ntawm daim duab 4 tias qhov tawg ntawm 20MnTiB siab-lub zog bolt kev nyuaj siab corrosion specimen nyob rau hauv txawv simulated corrosion ib puag ncig nthuav qhia ib tug raug khob-cone puas.Piv nrog rau cov qauv tsis zoo (Fig. 4a), qhov chaw nruab nrab ntawm cov fiber ntau tawg yog qhov me me.Qhov no qhia tau hais tias cov khoom siv ntawm cov khoom siv tau zoo heev tom qab corrosion.Nrog qhov nce ntawm qhov simulated corrosion tov concentration, cov pits nyob rau hauv fiber ntau nyob rau hauv nruab nrab ntawm cov pob txha tau nce, thiab pom tseeb tsim kua muag seams tshwm sim.Thaum lub concentration nce mus rau 20 lub sij hawm ntawm cov thawj simulated corrosion tov, pom tseeb corrosion pits tshwm nyob rau ntawm qhov chaw ntawm cov khoom siv thiab cov khoom siv corrosion. . qauv.
Nws yog inferred los ntawm daim duab 3d tias muaj cov kab nrib pleb uas pom tseeb hauv cov txheej txheem corrosion ntawm cov qauv, uas tsis muaj kev tiv thaiv zoo ntawm cov matrix.Hauv kev simulated corrosion daws ntawm pH 3.5 (Daim duab 4e), qhov saum npoo ntawm cov qauv yog corroded loj heev, thiab lub hauv paus fiber ntau yog pom tseeb me me., Muaj ntau cov kua muag tsis tu ncua nyob rau hauv qhov chaw ntawm cov fiber ntau. Nrog rau qhov nce ntawm pH tus nqi ntawm cov tshuaj simulated corrosion, lub kua muag cheeb tsam nyob rau hauv lub fiber cheeb tsam nyob rau hauv nruab nrab ntawm cov pob txha pob txha txo qis, lub qhov tob yuav maj mam txo, thiab lub qhov tob ntawm lub qhov tob kuj txo qis.
Thaum qhov kub thiab txias nce mus txog 50 ° C (Daim duab 4g), shear di ncauj cheeb tsam ntawm qhov tawg ntawm cov qauv yog qhov loj tshaj plaws, cov pits nyob rau hauv nruab nrab fiber ntau cheeb tsam tau nce ntau, thiab lub qhov tob kuj nce, thiab lub interface ntawm shear di ncauj ntug thiab cov qauv nto nce.Corrosion khoom thiab pits tau nce, uas tau lees paub qhov sib sib zog nqus ntawm substrate corrosion tshwm sim hauv daim duab 3f.
Tus nqi pH ntawm cov tshuaj corrosion yuav ua rau qee qhov kev puas tsuaj rau cov khoom siv ntawm 20MnTiB siab lub zog bolts, tab sis cov nyhuv tsis tseem ceeb.Hauv cov tshuaj corrosion ntawm pH 3.5, ntau cov khoom flocculent lossis koob zoo li cov khoom siv corrosion raug faib rau saum npoo ntawm cov qauv, thiab cov txheej txheem corrosion muaj qhov pom tseeb ntawm cov kab nrib pleb, uas tsis tuaj yeem tsim ib qho kev tiv thaiv zoo ntawm cov khoom siv corrosion thiab subst. morphology ntawm tus qauv tawg.Qhov no qhia tau hais tias lub peev xwm ntawm tus qauv los tiv thaiv deformation los ntawm sab nraud quab yuam yog ho txo ​​nyob rau hauv ib tug acidic ib puag ncig, thiab cov degree ntawm kev nyuaj siab corrosion nyiam ntawm cov khoom yog ho nce.
Tus thawj simulated corrosion tov muaj me ntsis cuam tshuam rau cov neeg kho tshuab cov khoom ntawm lub high-strength bolt qauv, tab sis raws li cov concentration ntawm simulated corrosion tshuaj tau nce mus rau 20 npaug ntawm cov thawj simulated corrosion tov, cov khoom siv ntawm cov qauv raug puas tsuaj, thiab muaj pom tseeb corrosion nyob rau hauv lub puas microstructure.pits, thib ob kab nrib pleb thiab ntau cov khoom siv corrosion.Thaum simulated corrosion tov concentration tau nce los ntawm 20 npaug rau 200 npaug ntawm cov thawj simulated corrosion tov concentration, cov nyhuv ntawm cov tshuaj corrosion concentration ntawm cov khoom siv ntawm cov khoom tsis muaj zog.
Thaum lub simulated corrosion kub yog 25 ℃, lub zog yield thiab tensile lub zog ntawm 20MnTiB high-strength bolt specimens tsis hloov ntau npaum li cas piv nrog cov uncorroded specimens. Txawm li cas los, nyob rau hauv lub simulated corrosion ib puag ncig kub ntawm 50 ° C, lub tensile zog thiab elongation ntawm tus qauv txo qis tus nqi, qhov loj tshaj plaws shrinkage tus nqi yog, thiab tus nqi ntawm lub di ncauj. Muaj qhov dimples nyob rau hauv nruab nrab fiber ntau cheeb tsam.Significantly nce, qhov tob nce, corrosion khoom thiab corrosion pits nce.Qhov no qhia tau hais tias qhov kub thiab txias synergistic corrosion ib puag ncig muaj kev cuam tshuam zoo rau cov neeg kho tshuab cov khoom muaj zog bolts, uas tsis pom tseeb ntawm chav tsev kub, tab sis tseem ceeb dua thaum kub txog 50 ° C.
Tom qab qhov kev ntsuam xyuas hauv tsev nrawm nrawm simulating cov huab cua puag ncig hauv Chongqing, lub zog tensile, lub zog tawm los, elongation thiab lwm yam tsis muaj zog ntawm 20MnTiB siab zog bolts raug txo, thiab pom tseeb kev nyuaj siab tshwm sim.Vim tias cov khoom nyob rau hauv kev ntxhov siab, yuav muaj ib qho tseem ceeb hauv zos corrosion acceleration phenomenon ua rau kev puas tsuaj rau cov yas thiab cov ntsiab lus yooj yim. muaj zog bolts, txo lub peev xwm los tiv thaiv deformation los ntawm sab nraud rog, thiab ua rau kom muaj kev ntxhov siab corrosion.
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