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20MnTiB ígwè bụ ihe a na-ejikarị eme ihe dị elu maka akwa akwa ígwè na mba m, na arụmọrụ ya dị oke mkpa maka ọrụ nchekwa nke àkwà mmiri. Dabere na nyocha nke gburugburu ikuku na Chongqing, ọmụmụ ihe a haziri ihe ngwọta corrosion na-eme ka mmiri na-ekpo ọkụ nke Chongqing na-eme ka mmiri na-ekpo ọkụ na-eme ka ọ dị elu, ma na-eme ka nrụgide corrosion na-eme ka ihu igwe dị elu. nke okpomọkụ, pH uru na simulated corrosion ngwọta itinye uche na nrụgide corrosion omume nke 20MnTiB bolts dị elu ka a mụrụ.
20MnTiB ígwè bụ ihe kasị n'ọtụtụ ebe na-eji elu-ike bolt ihe maka ígwè Ọdịdị àkwà mmiri na mba m, na arụmọrụ ya bụ nke ukwuu pụtara na nchekwa ọrụ nke bridges.Li et al.1 nwalere njirimara nke 20MnTiB steel nke a na-ejikarị na ọkwa 10.9 ike dị elu na oke okpomọkụ nke 20 ~ 700 ℃, wee nweta mgbakasị nrụgide, ike na-enye ike, ike nkwụsị, modul na-eto eto, na elongation.na ọnụọgụ mgbasawanye.Zhang et al.2, Hu et al.3, wdg, site na nyocha nke ihe mejupụtara kemịkalụ, nyocha akụrụngwa akụrụngwa, nnwale microstructure, nyocha nke macroscopic na microscopic nke elu eri ahụ, nsonaazụ ya gosipụtara na isi ihe kpatara mgbaji nke bolts dị elu metụtara eriri eri, yana ihe omume nke ntụpọ eri buru ibu nrụgide nrụgide, mgbawa n'ọnụ nrụgide uche na ọnọdụ corrosion mepere emepe na-eduga ná nrụgide.
A na-ejikarị ihe mkpuchi dị elu maka àkwà mmiri ígwè eme ihe ruo ogologo oge na ebe iru mmiri dị elu. Ihe ndị dị ka iru mmiri dị elu, okpomọkụ dị elu, na sedimentation na absorption nke ihe ndị na-emerụ ahụ na gburugburu ebe obibi nwere ike ime ka corrosion nke ígwè ígwè rụọ ọrụ n'ụzọ dị mfe. ha na-agbaji.Ka ọ dị ugbu a, e nwere ọtụtụ ọmụmụ banyere mmetụta nke gburugburu ebe obibi corrosion na nrụgide corrosion arụmọrụ nke ihe.Catar et al4 nyochara nrụgide corrosion omume nke magnesium alloys na dị iche iche aluminum ọdịnaya na acidic, alkaline na gburugburu ebe na-anọpụ iche site na nwayọọ strain rate test (SSRT) .Abdel et al.5 mụrụ electrochemical na stress corrosion cracking omume nke Cu10.5. et al.6 tụlere arụmọrụ corrosion nke anwụ-nkedo magnesium alloy MRI230D na 3.5% NaCl ngwọta site na nyocha imikpu, nnwale ịgba mmiri nnu, nyocha potentiodynamic polarization na SSRT.Zhang et al.7 mụrụ ihe nrụgide corrosion omume nke 9Cr martensitic ígwè na-eji SSRT na omenala electrochemical ule usoro chloride na mmetụta nke corrosion nke electrochemical ụlọ chloride. et al.8 nyochaa omume corrosion nrụgide na usoro mgbawa nke X70 ígwè na simulated mmiri apịtị ngwọta nwere SRB na okpomọkụ dị iche iche site SSRT.Liu et al.9 na-eji SSRT na-amụ mmetụta nke okpomọkụ na tensile strain rate on the seawater stress corrosion resistance of 00Cr21Ni14Mn5Mo2N austenitic results 5 dị ịrịba ama mmetụta nke igwe anaghị agba nchara.5. omume corrosion nrụgide nke igwe anaghị agba nchara.Lu et al.10 enyochala na-egbu oge mgbaji susceptibility nke samples na dị iche iche tensile ike akara ule site a nwụrụ anwụ ibu egbu oge mgbaji ule na SSRT.It na-atụ aro na tensile ike nke 20MnTiB ígwè na 35VB ígwè elu-ike bolts kwesịrị ịchịkwa na 1040-1190MPa. Otú ọ dị, ọtụtụ n'ime ndị a dị mfe na-eme ihe na-eme nnyocha na-na-na-1190MPa. Otú ọ dị, ọtụtụ n'ime ihe ndị a na-eji ihe ngwọta nke corructose na-eme ihe na-eme ka ọ bụrụ ihe na-eme ka ọ bụrụ ihe ọmụmụ nke 35% na-eme ka ọ dị mfe na-amụ ihe na-eme ka ihe ọmụmụ na-eme ka ọ bụrụ ihe ọmụmụ nke 3. ebe n'ezie ojiji gburugburu ebe obibi nke elu-ike bolts bụ ihe mgbagwoju anya na nwere ọtụtụ ihe na-emetụta, dị ka pH uru nke bolt.Ananya et al.11 mụrụ mmetụta nke gburugburu ebe obibi parameters na ihe na corrosive ọkara na corrosion na nrụgide corrosion cracking nke duplex igwe anaghị agba nchara.Sunada et al.12 na-eduzi ụlọ okpomọkụ nrụgide corrosion cracking ule na SUS304 ígwè na mmiri mmiri ngwọta nwere H2SO4 (0-5.5 kmol / m-3) na NaCl (0-4.5 kmol / m-3) .The mmetụta nke H2SO4 na NaCl na corrosion ụdị nke SUS304 ígwè e nwekwara amụ.Merwe et al. corrosion oge na nrụgide corrosion susceptibility nke A516 mgbali ụgbọ steel. Iji NS4 ngwọta dị ka ala mmiri simulating ngwọta, Ibrahim et al.14 nyochaa mmetụta nke gburugburu ebe obibi dị ka bicarbonate ion (HCO) ntinye uche, pH na okpomọkụ na nrụgide corrosion cracking nke API-X100 pipeline ígwè mgbe peeling na mkpuchi.Shan et al.15 mụrụ na mgbanwe iwu nke nrụgide corrosion cracking susceptibility nke austenitic igwe anaghị agba nchara 00Cr18Ni10 na okpomọkụ n'okpuru dị iche iche okpomọkụ ọnọdụ (30 ~ 250 ℃) n'okpuru ọnọdụ nke nwa mmiri ọkara na simulated coal-na-hydrogen osisi site SSRT.Han et al.16 ji hydrogen embriltment nwụrụ anwụ nke-nlele na-egbu oge na-egbu oge na-eji hydrogen embriltment-Susstre. SSRT.Zhao17 mụrụ mmetụta nke pH, SO42-, Cl-1 na nrụgide corrosion omume nke GH4080A alloy site SSRT.The results na-egosi na ala pH uru, na njọ na stress corrosion eguzogide nke GH4080A alloy.It nwere doro anya stress corrosion uche na Cl-1, na SO4 mmetụta na-enwe mmetụta corronic na Cl-1, na-enwe mmetụta corroonic ọ bụla n'ime ụlọ. sion na 20MnTiB ígwè nwere ike dị elu.
Iji chọpụta ihe kpatara ọdịda nke bolts dị elu na-eji na àkwà mmiri, onye edemede ahụ emeela usoro ọmụmụ ihe ọmụmụ. A na-ahọrọ ihe atụ nke ike dị elu, na ihe kpatara ọdịda nke ihe atụ ndị a ka a tụlere site n'echiche nke ihe mejupụtara kemịkalụ, mgbaji microscopic morphology, metallographic structure and mechanical properties analysis19, 20.Based na nyocha nke ụlọ ọrụ nyocha nke na-adịbeghị anya, Chorong Sizerong na gburugburu ebe obibi. Lating the iru mmiri ihu igwe nke Chongqing e design.Stress corrosion nnwale, electrochemical corrosion nnwale na corrosion ike ọgwụgwụ nnwale nke elu-ike bolts na Chongqing simulated iru mmiri ihu igwe e rụrụ rụrụ. N'ime nnyocha e mere, mmetụta nke okpomọkụ, pH uru na ịta nke simulated corrosion ngwọta na nrụgide corrosion omume nke 20Mn stremscopic ma ọ bụ microscopic n'ịchọpụta ihe na-eme nchọpụta site n'ịchọpụta ihe na-akpata corrosion nke 20Mn. nyocha foto, na ngwaahịa corrosion elu.
Chongqing dị na ndịda ọdịda anyanwụ China, ugwu ugwu nke osimiri Yangtze, ma nwee ihu igwe na-ekpo ọkụ nke mmiri na-ekpo ọkụ, nkezi okpomọkụ bụ 16-18 Celsius C, nkezi iru mmiri kwa afọ na-abụkarị 70-80%, awa anwụ anwụ kwa afọ bụ 1000-1400 awa, na pasent nke anwụ bụ naanị 25%.
Dị ka akụkọ ndị metụtara anwụ na ọnọdụ okpomọkụ dị na Chongqing si 2015 ruo 2018 si kwuo, nkezi okpomọkụ kwa ụbọchị na Chongqing dị obere ka 17 Celsius C yana ihe ruru 23 Celsius.Okpomọkụ kachasị elu na ahụ akwa mmiri nke Chaotianmen Bridge dị na Chongqing nwere ike iru 50 Celsius C21,22. Ya mere, a na-edozi ọkwa okpomọkụ maka ule corrosion nrụgide na 25 ° C na 50 ° C.
The pH uru nke simulated corrosion ngwọta kpọmkwem na-ekpebi ego nke H +, ma ọ pụtaghị na ala pH uru, mfe corrosion na-eme. Mmetụta nke pH na nsonaazụ ga-adịgasị iche maka dị iche iche ihe na ngwọta. Iji mma na-amụ mmetụta nke simulated corrosion ngwọta na nrụgide corrosion arụmọrụ nke elu-ike bolts, na pH uru 5 setịpụrụ corrosion 5.5.5.5. yana nchikota ya na nyocha akwukwo23 na pH nke mmiri ozuzo kwa afo na Chongqing.2010 rue 2018.
Ọnụ ọgụgụ dị elu nke ngwọta corrosion simulated na-eme ka ọ dịkwuo elu, na-eme ka ọdịnaya ion dị na ngwọta corrosion simulated, na mmetụta dị ukwuu na ihe onwunwe nke ihe onwunwe. Iji nyochaa mmetụta nke simulated corrosion solution maida na nrụgide corrosion nke elu-ike bolts, na artificial laabu accelerated corrosion test e ghọtara, na simulated corrosion ngwọta na-edozi na mbụ corrosion ngwọta 4 na-edozi corrosion ngwọta nke mbụ corrosion ngwọta 4. ×), 20 × izizi simulated corrosion solution focus (20 ×) na 200 × izizi simulated corrosion solution focus (200 ×).
The gburugburu ebe obibi na okpomọkụ nke 25 ℃, pH uru nke 5.5, na ịta nke mbụ simulated corrosion ngwọta bụ kasị nso na n'ezie ojiji ọnọdụ nke elu-ike bolts maka bridges. Otú ọ dị, iji mee ka ngwa ngwa nke corrosion ule usoro, nnwale ọnọdụ na okpomọkụ nke 25 Celsius C, a pH nke 5.20 nke corrosion ngwọta na-arụ ọrụ dị ka ihe ngwọta nke corrosion nke 5.20 mgbe e debere ihe ngwọta nke corrosion nke 5.20. A na-enyocha mmetụta nke okpomọkụ, ntinye uche ma ọ bụ pH uru nke ngwọta corrosion simulated na arụmọrụ corrosion nke nrụgide dị elu nke a na-enyocha n'otu n'otu, ihe ndị ọzọ na-agbanweghị agbanwe, nke a na-eji dị ka ọkwa nnwale nke otu njikwa ntụaka.
Dị ka 2010-2018 ikuku gburugburu àgwà nkowa nke Chongqing Municipal Bureau of Ecology and Environment nyere, na-ezo aka na mmiri ozuzo components kọrọ na Zhang24 na ndị ọzọ akwụkwọ akụkọ kọrọ na Chongqing, a simulated corrosion ngwọta dabeere na-amụba ịta nke SO42- e mere.The mejupụtara nke preciq2 n'ime obodo preciq. E gosipụtara ngwọta corrosion simulated na tebụl 1:
A na-akwadebe ihe ngwọta corrosion nke simulated site na usoro nguzozi nke ion nke kemịkalụ site na iji reagents nyocha na mmiri distilled. A na-edozi uru pH nke ngwọta corrosion nke simulated na mita pH ziri ezi, ngwọta nitric acid na ngwọta sodium hydroxide.
Iji mee ka ihu igwe dị jụụ dị na Chongqing, a na-emezi onye nyocha nke nnu pụrụ iche ma mee ya25. Dị ka e gosiri na Figure 1, ngwá ọrụ nnwale ahụ nwere usoro abụọ: usoro ịgba mmiri nnu na ọkụ ọkụ. ihe na-enyocha okpomọkụ, nke na-achọpụta ọnọdụ okpomọkụ dị n'ime ụlọ nyocha. Akụkụ njikwa bụ nke microcomputer, nke na-ejikọta akụkụ ịgbasa na akụkụ induction iji chịkwaa usoro nyocha dum. A na-etinye usoro ọkụ ọkụ n'ime ụlọ nyocha nnu nnu iji mee ka ìhè anyanwụ dịkwuo mma. Usoro ọkụ na-agụnye oriọna infrared na onye na-ahụ maka oge. N'otu oge ahụ, a na-etinye ihe nlele n'ime ọkụ ọkụ n'ime oge nlele ọkụ n'ime ụlọ nleba anya n'oge okpomọkụ.
A na-edozi ihe nlele corrosion nke nrụgide n'okpuru ibu mgbe niile dị ka NACETM0177-2005 (Laboratory Testing of Sulfide Stress Cracking and stress Corrosion Cracking Resistance of Metals in a H2S Environment) .Stress corrosion specimens e bu ụzọ kpochaa ya na acetone na ultrasonic igwe nhicha, wee wepụ mmanụ na-edozi ahụ n'ime mmanụ aṅụ na-eme ka ọ dị ọcha. mber nke nnu ịgba ule ngwaọrụ simulate na corrosion ọnọdụ na iru mmiri na gburugburu ebe obibi nke Chongqing. Dị ka ọkọlọtọ NACETM0177-2005 na nnu ịgba ule ọkọlọtọ GB/T 10,125-2012, na mgbe niile ibu stress corrosion ule oge na nke a ọmụmụ bụ uniformly kpebisiri ike na-168 h.Tensile na corrosion nke eluigwe na ala na corrosion 10,125-2012. igwe na-anwale tensile, na ihe eji arụ ọrụ ha na mkpọmkpọkpọ corrosion morphology ka a tụlere.
Ihe osise 1 na-egosi macro- na micro-morphology nke elu corrosion nke elu-ike bolt stress sample n'okpuru dị iche iche corrosion ọnọdụ.2 na 3 n'otu n'otu.
Usoro ihe omimi nke macroscopic nke ihe nleba anya corrosion nrụgide nke 20MnTiB bolts ike dị elu n'okpuru ebe dị iche iche corrosion simulated: (a) enweghị corrosion;(b) 1 oge;(c) 20 ×;(d) 200 ×;(e) pH3.5;(f) pH 7.5;(g) 50°C.
Micromorphology nke ngwaahịa corrosion nke 20MnTiB dị elu bolts dị iche iche simulated corrosion gburugburu (100×): (a) 1 oge;(b) 20 ×;(c) 200 ×;(d) pH3.5;(e) pH7 .5;(f) 50°C.
Enwere ike ịhụ ya site na Fig. 2a na elu nke na-enweghị ihe ọ bụla na-eme ka ọkpụkpụ na-egbuke egbuke na-egbuke egbuke na-egbuke egbuke na-egbuke egbuke na-egbuke egbuke na-enweghị corrosion doro anya. Otú ọ dị, n'okpuru ọnọdụ nke mbụ simulated corrosion solution (Fig 2b) , n'elu ihe nlele ahụ bụ akụkụ nke tan na agba aja aja-acha uhie uhie corrosion ngwaahịa, na ụfọdụ ebe doro anya nke metal n'elu na-egosi ntakịrị ihe na-egbuke egbuke n'elu. ngwọta corrosion simulated enweghị mmetụta n'elu ihe nlele ahụ.Otú ọ dị, n'okpuru ọnọdụ nke 20 × mbụ simulated corrosion ngwọta ịta ahụhụ (Fig. 2c), elu nke elu-ike bolt specimen e kpamkpam kpuchie site a nnukwu ego nke tan corrosion ngwaahịa na a obere ego nke agba aja aja-acha uhie uhie corrosion.product, ọ dịghị doro anya dara ọla luster hụrụ, na e nwere a obere ego nke sub-black0 nke ngwaahịa corrosion nke agba aja aja-black0 n'okpuru ọnọdụ corrosion. mbụ simulated corrosion ngwọta itinye uche (Fig. 2d), elu nke sample na-kpamkpam kpuchie aja aja corrosion ngwaahịa, na agba aja aja-oji ngwaahịa corrosion na-apụta n'akụkụ ụfọdụ.
Dị ka pH na-ebelata na 3.5 (Fig 2e), ngwaahịa ndị na-emepụta ihe na-acha odo odo na-acha odo odo bụ ndị kasị dị n'elu ihe atụ, na ụfọdụ n'ime ngwaahịa corrosion e kpochapụrụ.
Ọnụ ọgụgụ 2g na-egosi na ka okpomọkụ na-abawanye ruo 50 Celsius C, ọdịnaya nke ngwaahịa corrosion na-acha uhie uhie na-acha uhie uhie n'elu ihe nlele ahụ na-ebelata nke ọma, ebe ngwaahịa corrosion na-egbuke egbuke na-ekpuchi elu nke ihe nlele ahụ na nnukwu ebe.
Dị ka e gosiri na Figure 3, n'okpuru dị iche iche corrosion gburugburu, na corrosion ngwaahịa n'elu 20MnTiB elu-ike bolt stress corrosion ụdị na-delaminated n'ụzọ doro anya, na ọkpụrụkpụ nke corrosion oyi akwa na-abawanye na-abawanye nke ịta nke simulated corrosion solution.N'okpuru ọnọdụ nke mbụ simulated corrosion ngwaahịa nwere ike kewara n'elu abụọ corrosion ngwọta (Fig. A na-ekesa oyi akwa nke ngwaahịa corrosion nke ọma, mana ọnụ ọgụgụ buru ibu na-apụta;N'ime oyi akwa bụ a rụrụ ụyọkọ nke corrosion ngwaahịa.N'okpuru ọnọdụ nke 20 × mbụ simulated corrosion ngwọta ịta (Fig. 3b), na corrosion oyi akwa n'elu nke sample nwere ike kewara atọ n'ígwé: outermost oyi akwa bụ tumadi chụsasịrị ụyọkọ corrosion ngwaahịa, nke rụrụ na porous, na-enweghị ezigbo nchebe ọrụ;N'etiti oyi akwa bụ a edo corrosion ngwaahịa oyi akwa, ma e nwere doro anya cracks, na corrosion ion nwere ike gafere site cracks na-emebi mkpụrụ;N'ime oyi akwa bụ ok corrosion ngwaahịa oyi akwa na-enweghị doro anya cracks, nke nwere ezi nchebe mmetụta na substrate.N'okpuru ọnọdụ nke 200 × mbụ simulated corrosion ngwọta ịta (Fig. 3c), na corrosion oyi akwa n'elu nke sample nwere ike kewara n'ime atọ n'ígwé: ndị outermost oyi akwa bụ a mkpa na edo corrosion ngwaahịa oyi akwa;N'etiti oyi akwa bụ tumadi petal ekara na flake corrosion ime oyi akwa bụ ok corrosion ngwaahịa oyi akwa na-enweghị doro anya cracks na oghere, nke nwere ezi nchebe mmetụta na mkpụrụ.
Enwere ike ịhụ ya site na Fig. 3d na na gburugburu ebe obibi corrosion nke simulated nke pH 3.5, e nwere ọnụ ọgụgụ dị ukwuu nke flocculent ma ọ bụ agịga dị ka corrosion ngwaahịa n'elu 20MnTiB elu-ike bolt specimen.It na-speculated na ndị a corrosion ngwaahịa bụ tumadi γ-FeOOH oyi akwa na inter-FeOOH. mgbawa doro anya.
Enwere ike ịhụ ya site na Fig. 3f na mgbe okpomọkụ na-abawanye ruo 50 Celsius C, ọ dịghị ihe doro anya nchara nchara nchara dị n'ime nhazi oyi akwa corrosion, na-egosi na e nwere ọdịiche dị n'etiti akwa corrosion na 50 Celsius C, nke mere ka mkpụrụ osisi ahụ ghara ikpuchi kpamkpam site na ngwaahịa corrosion.Na-enye nchebe pụọ na ụbara ọdịdị corrosion nke mkpụrụ osisi.
A na-egosi na ihe eji arụ ọrụ nke bolts ike dị elu n'okpuru nrụrụ nrụgide mgbe niile na gburugburu corrosive dị iche iche ka egosiri na Tebụl 2:
Ọ nwere ike ịhụ site na Isiokwu 2 na n'ibu Njirimara nke 20MnTiB elu-ike bolt ụdị ka na-ezute ọkọlọtọ chọrọ mgbe akọrọ-mmiri okirikiri accelerated corrosion ule dị iche iche simulated corrosion gburugburu, ma e nwere ụfọdụ mmebi tụnyere na uncorroded ones.sample.At ịta nke mbụ simulated corrosion ngwọta, ma × 2 adịghị agbanwe n'ibu ngwọta, ma × 2. Ịta nke simulated ngwọta, elongation nke sample na-ebelata nke ukwuu. The n'ibu Njirimara yiri na ịta nke 20 × na 200 × mbụ simulated corrosion ngwọta. Mgbe pH uru nke simulated corrosion ngwọta gbadara na 3.5, na tensile ike na elongation nke samples na-ebelata nke ukwuu. Mgbe okpomọkụ na-ebili na 50 ° C na-ebelata ike nke ukwuu na elong nke ebe dị nso na elong, na elong na-agbadata n'ebe dị nso na 50 ° C. uru.
A na-egosi ụdị mgbawa nke 20MnTiB dị elu bolt stress corrosion specimens n'okpuru gburugburu corrosion dị iche iche na-egosi na eserese 4, nke bụ macro-morphology nke mgbawa ahụ, mpaghara eriri dị n'etiti etiti mgbaji ahụ, egbugbere ọnụ micro-morphological nke interface shear, na elu nke ihe atụ.
Ụdị mgbawa nke macroscopic na microscopic morphologies nke 20MnTiB nnukwu ike bolt n'ụdị dị iche iche simulated corrosion gburugburu (500×): (a) enweghị corrosion;(b) 1 oge;(c) 20 ×;(d) 200 ×;(e) pH3.5;(f) pH7.5;(g) 50°C.
Enwere ike ịhụ site na Fig. 4 na mgbaji nke 20MnTiB nnukwu ike bolt stress specimen n'okpuru ọnọdụ corrosion dị iche iche nke simulated na-egosi mgbawa nke iko-cone.E jiri ya tụnyere ihe atụ na-enweghị atụ (Fig 4a), ebe etiti etiti eriri eriri eriri dị ntakịrị., Shear egbugbere ọnụ ebe bụ ibu.This na-egosi na n'ibu Njirimara nke ihe na-budata mebiri emebi mgbe corrosion.With abawanye nke simulated corrosion ngwọta ịta, na olulu na eriri ebe na etiti nke mgbaji ahụ mụbara, na doro anya anya mmiri seams pụtara.Mgbe ịta ụbara na 20 ugboro nke mbụ simulated corrosion ngwọta, doro anya corrosion nsọtụ nke corrosion ngwọta, doro anya corrosion onu n'etiti olulu na nza nke ọ pụtara na interface nke corrosion ngwọta n'etiti nza na nza nke n'elu nza n'elu olulu na nza n'elu. ngwaahịa n'elu. sample.
A na-esi na eserese 3d pụta na enwere mgbawa doro anya na oyi akwa corrosion n'elu ihe nlele ahụ, nke na-enweghị ezigbo nchebe na matrix.Na simulated corrosion ngwọta nke pH 3.5 (Figure 4e), elu nke sample bụ nke ukwuu corroded, na Central eriri ebe doro anya obere., E nwere ọnụ ọgụgụ buru ibu nke akwa akwa akwa na-adịghị mma n'etiti etiti eriri ahụ. Site na mmụba nke pH uru nke ngwọta corrosion simulated, mpaghara adọka na mpaghara eriri dị n'etiti etiti mgbawa ahụ na-ebelata, olulu ahụ ji nwayọọ nwayọọ na-ebelata, na olulu omimi na-ebelatakwa nwayọọ nwayọọ.
Mgbe okpomọkụ na-abawanye ruo 50 Celsius C (Fig 4g), mpaghara egbugbere ọnụ na-agbaji agbaji nke ihe nlele ahụ bụ nke kachasị ukwuu, olulu ndị dị na mpaghara eriri etiti mụbara nke ukwuu, na omimi olulu ahụ mụbara, na interface dị n'etiti ọnụ ọnụ egbugbere ọnụ na ihe nlele ahụ mụbara.Ngwaahịa na-emebi emebi na olulu abawanyela, nke gosipụtara na-emewanyewanye ọnọdụ nke corrosion mkpụrụ osisi gosipụtara na Fig. 3f.
The pH uru nke corrosion ngwọta ga-eme ka ụfọdụ mebiri na n'ibu Njirimara nke 20MnTiB elu-ike bolts, ma mmetụta bụ adịghị ịrịba ama.In corrosion ngwọta nke pH 3.5, a ọnụ ọgụgụ buru ibu nke flocculent ma ọ bụ agịga-dị ka corrosion ngwaahịa na-ekesa n'elu nke sample, na corrosion oyi akwa nwere doro anya na-echebe nke corrosion nke corrosion, nke na-enweghị ike na-etolite a corrosion ngwọta nke corrosion. ngwaahịa na microscopic morphology nke ihe atụ nke mgbawa. Nke a na-egosi na ike nke ihe nlele na-eguzogide nrụrụ site na ike mpụga na-ebelata nke ukwuu na gburugburu acidic, na ogo nke nrụgide corrosion nke ihe onwunwe na-abawanye nke ukwuu.
Ngwọta corrosion nke mbụ simulated enweghị mmetụta dị nta na akụrụngwa akụrụngwa nke ihe nlele bolt dị elu, mana ka ntinye nke ngwọta corrosion simulated mụbara ruo ugboro 20 nke ihe ngwọta corrosion nke mbụ simulated, ihe ndị na-emepụta ihe nke ihe nlele ahụ mebiri nke ukwuu, na enwere mbibi doro anya na mgbawa microstructure.olulu, nke abụọ cracks na otutu corrosion ngwaahịa.Mgbe simulated corrosion ngwọta na-abawanye site na 20 ugboro 200 ugboro nke mbụ simulated corrosion ngwọta ịta ahụhụ, mmetụta nke corrosion ngwọta ịta ahụhụ na n'ibu Njirimara nke ihe onwunwe ebelatawo.
Mgbe simulated corrosion okpomọkụ bụ 25 ℃, mkpụrụ ike na tensile ike nke 20MnTiB elu-ike bolt specimens adịghị agbanwe nke ukwuu ma e jiri ya tụnyere uncorroded specimens. Otú ọ dị, n'okpuru simulated corrosion gburugburu ebe obibi okpomọkụ nke 50 Celsius C, ike tensile ike na elongation nke ihe atụ, ọnụ ahịa na-ebelata nke ukwuu n'ihe atụ nke ngalaba. nke kasị ukwuu, na e nwere dimples na Central eriri area.N'ụzọ dị ịrịba ama, olulu omimi na-abawanye, corrosion ngwaahịa na corrosion olulu mụbara.Nke a na-egosi na okpomọkụ synergistic corrosion gburugburu ebe obibi nwere mmetụta dị ukwuu na n'ibu Njirimara nke elu-ike bolts, nke a na-apụtaghị ìhè na ụlọ okpomọkụ, ma ihe dị ịrịba ama mgbe okpomọkụ ruru 50 Celsius C.
Mgbe ime ụlọ accelerated corrosion ule simulating ikuku gburugburu na Chongqing, na tensile ike, ike na-amịpụta ike, elongation na ndị ọzọ kwa nke 20MnTiB ike bolts e belatara, na doro anya nchegbu mmebi mere.Ebe ọ bụ na ihe onwunwe nọ n'okpuru nrụgide, a ga-enwe a ịrịba localized corrosion acceleration phenomen na-eme ka ọ dị mfe corrosion acceleration phenomen na plastic mebiri emebi. - ike bolts, belata ikike iguzogide nrụrụ site na mpụga ike, na-amụba ọchịchọ nke nchegbu corrosion.
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