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Ígwè 20MnTiB bụ ihe e ji bolt dị ike nke a na-ejikarị eme ihe maka àkwà mmiri ígwè na mba m, arụmọrụ ya dịkwa oke mkpa maka ọrụ nchekwa nke àkwà mmiri. Dabere na nyocha nke gburugburu ebe obibi dị na Chongqing, ọmụmụ ihe a chepụtara ngwọta nchara nke na-eme ka ihu igwe dị mmiri nke Chongqing dị ka mmiri, ma mee nnwale nrụrụ nrụgide nke bolt dị ike nke na-eme ka ihu igwe dị mmiri nke Chongqing dị ka mmiri. A mụrụ mmetụta nke okpomọkụ, uru pH na njupụta ngwọta nchara nke e mere na omume nchara nrụgide nke bolt dị elu nke 20MnTiB.
Ígwè 20MnTiB bụ ihe e ji beltị dị ike nke a na-ejikarị eme ihe maka àkwà mmiri ígwè na mba m, arụmọrụ ya dịkwa oke mkpa maka ọrụ nchekwa nke àkwà mmiri. Li et al. 1 nwalere ihe onwunwe nke ígwè 20MnTiB nke a na-ejikarị na beltị dị elu nke ọkwa 10.9 n'ogo okpomọkụ dị elu nke 20 ~ 700 ℃, wee nweta usoro nrụgide-nrụgide, ike mmepụta, ike nrụgide, modulus Young, na ogologo. na coefficient mgbasa. Zhang et al. 2, Hu et al. 3, wdg, site na nnwale kemịkalụ mejupụtara, nnwale ihe onwunwe igwe, nnwale microstructure, nyocha macroscopic na microscopic nke elu eriri, nsonaazụ ya na-egosi na isi ihe kpatara mgbawa nke beltị dị ike metụtara ntụpọ eriri, na ihe omume nke ntụpọ eriri Nnukwu nrụgide, njupụta nrụgide nke isi mgbawa na ọnọdụ nchara ikuku na-eduga na mgbawa nrụrụ nrụgide.
A na-ejikarị blọt siri ike maka àkwà mmiri ígwè eme ihe ruo ogologo oge n'ebe mmiri dị. 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 ibute ire ere nke ihe owuwu ígwè ngwa ngwa. Ncha nwere ike ibute mfu nke blọt siri ike, na-ebute ọtụtụ ntụpọ na mgbawa. Mmebi na mgbawa ndị a ga-anọgide na-agbasa, si otú a na-ebelata ndụ nke blọt siri ike ma ọbụna mee ka ha gbajie. Ruo ugbu a, enwere ọtụtụ ọmụmụ gbasara mmetụta nke nchara gburugburu ebe obibi na arụmọrụ nchara nrụgide nke ihe. Catar et al4 nyochachara omume nchara nrụgide nke alloys magnesium nwere ọdịnaya aluminom dị iche iche na gburugburu acidic, alkaline na nke na-anọpụ iche site na nnwale ọsọ ọsọ (SSRT). Abdel et al.5 mụrụ omume mgbawa electrochemical na nrụgide nke alloy Cu10Ni na ngwọta NaCl 3.5% n'ihu ọnụnọ dị iche iche nke ions sulfide. Aghion et al.6 nyochachara arụmọrụ nchara nke d-cast magnesium alloy MRI230D na ngwọta NaCl 3.5% site na nnwale imikpu, ule ịgba nnu, nyocha potentiodynamic polarization na SSRT.Zhang na ndị otu ya.7 mụrụ àgwà nrụrụ nrụgide nke ígwè 9Cr martensitic site na iji SSRT na usoro nnwale electrochemical ọdịnala, wee nweta mmetụta nke ion chloride na omume nrụrụ static nke ígwè martensitic na okpomọkụ ụlọ. Chen na ndị otu ya.8 nyochachara omume nrụrụ nrụgide na usoro mgbawa nke ígwè X70 na ngwọta apịtị mmiri e mere ka ọ dị SRB na okpomọkụ dị iche iche site na SSRT. Liu na ndị otu ya.9 jiri SSRT mụọ mmetụta nke okpomọkụ na ọnụego nrụgide na nguzogide nrụgide na nguzogide nchara mmiri nke 00Cr21Ni14Mn5Mo2N ígwè anaghị agba nchara austenitic. Nsonaazụ ya na-egosi na okpomọkụ dị n'etiti 35 ~ 65℃ enweghị mmetụta dị mkpa na omume nrụrụ nrụgide nke ígwè anaghị agba nchara.Lu na ndị otu ya. 10 tụlere mmetụta nke mgbawa na-egbu oge nke ihe nlele nwere ọkwa ike nrụgide dị iche iche site na nnwale mgbawa na-egbu oge na SSRT. A na-atụ aro na ike nrụgide nke 20MnTiB ígwè na 35VB ígwè dị elu kwesịrị ịchịkwa na 1040-1190MPa. Agbanyeghị, ọtụtụ n'ime ọmụmụ ihe ndị a na-eji ngwọta NaCl dị mfe 3.5% iji mee ka gburugburu ebe obibi na-emebi emebi dị ka ihe na-emebi emebi, ebe gburugburu ojiji nke bolts dị elu dị mgbagwoju anya karịa ma nwee ọtụtụ ihe na-emetụta ya, dị ka uru pH nke bolts. Ananya et al. 11 mụrụ mmetụta nke paramita gburugburu ebe obibi na ihe ndị dị na gburugburu ebe obibi na-emebi emebi na mgbawa na mgbawa corrosion nke ígwè anaghị agba nchara duplex. Sunada et al. 12 mere ule mgbawa nke nrụgide okpomọkụ ụlọ na ígwè SUS304 n'ime mmiri mmiri nwere H2SO4 (0-5.5 kmol/m-3) na NaCl (0-4.5 kmol/m-3). A mụkwara mmetụta nke H2SO4 na NaCl na ụdị nchara nke ígwè SUS304. Merwe et al.13 jiri SSRT mụọ mmetụta nke ntụzịaka ntụgharị, okpomọkụ, mkpokọta CO2/CO, nrụgide gas na oge nchara na mmetụta nke nchara nrụgide nke ígwè arịa nrụgide A516. Site na iji ngwọta NS4 dị ka ihe ngwọta ime ka mmiri dị n'ime ala, Ibrahim et al. 14 nyochachara mmetụta nke paramita gburugburu ebe obibi dị ka ntinye bicarbonate ion (HCO), pH na okpomọkụ na mgbawa nchara nrụgide nke ígwè pipeline API-X100 mgbe ha bepụrụ mkpuchi ahụ. Shan et al. 15 mụrụ iwu mgbanwe nke ike mgbawa nke nchara nke austenitic ígwè anaghị agba nchara 00Cr18Ni10 nwere okpomọkụ n'okpuru ọnọdụ okpomọkụ dị iche iche (30~250℃) n'okpuru ọnọdụ nke mmiri ojii na osisi coal-to-hydrogen nke SSRT mere. Han et al.16 kọwara ike nke hydrogen embrittlement nke ihe nlele bolt siri ike site na iji ule mgbawa egbu oge na-egbu oge na SSRT.Zhao17 mụrụ mmetụta nke pH, SO42-, Cl-1 na omume nchara nrụgide nke alloy GH4080A site na SSRT. Nsonaazụ ya na-egosi na obere uru pH, ka nguzogide nchara nrụgide nke alloy GH4080A ka njọ. O nwere mmetụta doro anya na nrụgide corrosion na Cl-1, ọ dịghịkwa enwe mmetụta na SO42-ionic na okpomọkụ ụlọ. Agbanyeghị, enwere obere ọmụmụ ihe gbasara mmetụta nke corrosion gburugburu ebe obibi na 20MnTiB ígwè siri ike.
Iji chọpụta ihe kpatara ọdịda nke bolt ndị siri ike nke ejiri na àkwà mmiri, onye dere ya emeela usoro ọmụmụ. Ahọpụtara ihe nlele bolt ndị siri ike, a tụlekwara ihe kpatara ọdịda nke ihe atụ ndị a site n'echiche nke ihe mejupụtara kemịkalụ, ọdịdị microscopic morphology nke mgbawa, nhazi metallographic na nyocha njirimara mechanical 19, 20. Dabere na nyocha nke gburugburu ebe obibi dị na Chongqing n'afọ ndị na-adịbeghị anya, e mepụtara atụmatụ nchara nke na-eṅomi ihu igwe mmiri nke Chongqing. Emere nnwale corrosion nrụgide, nnwale corrosion electrochemical na nnwale ike ọgwụgwụ nke bolt ndị siri ike na ihu igwe mmiri Chongqing nke emere ka ọ dị nro. N'ọmụmụ ihe a, a nyochachara mmetụta nke okpomọkụ, uru pH na ntinye nke ngwọta corrosion emere ka ọ dị nro na omume corrosion nrụgide nke bolt ndị siri ike nke 20MnTiB site na nnwale ihe onwunwe igwe, nyocha macroscopic na microscopic, na ngwaahịa corrosion elu.
Chongqing dị na ndịda ọdịda anyanwụ China, ebe dị n'elu Osimiri Yangtze, ma nwee ihu igwe mmiri dị n'okpuru ebe okpomọkụ. Okpomọkụ kwa afọ bụ 16-18°C, nkezi iru mmiri kwa afọ bụkarị 70-80%, awa anwụ kwa afọ bụ awa 1000-1400, pasentị anwụ bụ naanị 25-35%.
Dịka akụkọ gbasara anwụ na okpomọkụ gburugburu ebe obibi na Chongqing si kwuo site na 2015 ruo 2018, okpomọkụ kwa ụbọchị na Chongqing dị ala dịka 17°C ma dị elu dịka 23°C. Okpomọkụ kachasị elu na akwa akwa nke Chaotianmen Bridge na Chongqing nwere ike iru 50°C °C21,22. Ya mere, e debere ọkwa okpomọkụ maka ule nchara nrụgide na 25°C na 50°C.
Uru pH nke ngwọta nchara a na-eme ka ọ dị mfe ikpebi ọnụọgụ H+, mana ọ pụtaghị na uru pH dị ala, ọ ga-adị mfe ire ere. Mmetụta nke pH na nsonaazụ ya ga-adị iche maka ihe na ngwọta dị iche iche. Iji mụọ mmetụta nke ngwọta nchara a na-eme ka ọ dị mma na arụmọrụ nchara nrụgide nke bolt siri ike, e setịpụrụ uru pH nke nnwale nchara nrụgide ka ọ bụrụ 3.5, 5.5 na 7.5 yana nyocha akwụkwọ23 na oke pH nke mmiri ozuzo kwa afọ na Chongqing.2010 ruo 2018.
Ka njupụta nke ihe ngwọta nchara a na-eme ka ọ dị elu, otú ahụ ka ọdịnaya ion dị na ihe ngwọta nchara a na-eme ka ọ dị elu, mmetụta ya na ihe onwunwe ya ka ukwuu. Iji mụọ mmetụta nke njupụta nke ihe ngwọta nchara a na-eme ka ọ dị na nrụgide nrụgide nke bolt siri ike, a chọpụtara ule nchara ngwa ngwa nke ụlọ nyocha, a setịpụkwara njupụta nke ihe ngwọta nchara a na-eme ka ọ dị larịị 4 na-enweghị nrụgide, nke bụ njupụta nke ihe ngwọta nchara a na-eme ka ọ dị (1 ×), njupụta nke ihe ngwọta nchara a na-eme ka ọ dị 20 × na njupụta nke ihe ngwọta nchara a na-eme ka ọ dị 200 × (200 ×).
Gburugburu ebe obibi nwere okpomọkụ nke 25℃, uru pH nke 5.5, na njupụta nke ngwọta nchara mbụ e mere ka ọ dị ka ihe kacha nso na ọnọdụ ojiji nke bolt siri ike maka àkwà mmiri. Agbanyeghị, iji mee ka usoro nnwale nchara dị ngwa, ọnọdụ nnwale nwere okpomọkụ nke 25 °C, pH nke 5.5 na njupụta nke 200 × ngwọta nchara mbụ e mere ka ọ dị ka otu njikwa ntụaka. Mgbe a nyochachara mmetụta nke okpomọkụ, njupụta ma ọ bụ uru pH nke ngwọta nchara e mere ka ọ dị na arụmọrụ nchara nrụgide nke bolt siri ike dị elu n'otu n'otu, ihe ndị ọzọ ka dị agbanweghị, nke ejiri dị ka ọkwa nnwale nke otu njikwa ntụaka.
Dịka nkọwapụta mma gburugburu ebe obibi nke afọ 2010-2018 nke Chongqing Municipal Bureau of Ecology and Environment nyere, nakwa maka akụkụ mmiri ozuzo akọpụtara na Zhang24 na akwụkwọ ndị ọzọ akọpụtara na Chongqing, e mepụtara ngwọta nchara e mere ka ọ dị ka ihe e ji eme ka ọ dị elu site n'ịbawanye njupụta nke SO42. Nhazi nke mmiri ozuzo na mpaghara obodo ukwu nke Chongqing na 2017. E gosiri ihe mejupụtara ngwọta nchara e mere ka ọ dị na Tebụl 1:
A na-eji usoro nhazi nke ion kemịkalụ na-edozi ihe ngwọta nchara. A na-eji mita pH ziri ezi, ngwọta nitric acid na ngwọta sodium hydroxide dozie uru pH nke ihe ngwọta nchara a na-emebu.
Iji mee ka ihu igwe dị mmiri mmiri dị na Chongqing dị ka ọ dị na Chongqing, emezigharịrị ma hazie ihe nnwale mmiri nnu nke ọma25. Dịka egosiri na Foto 1, akụrụngwa nnwale ahụ nwere sistemụ abụọ: sistemụ mmiri nnu na sistemụ ọkụ. Sistemụ mmiri nnu bụ isi ọrụ nke akụrụngwa nnwale ahụ, nke nwere akụkụ njikwa, akụkụ mmiri na akụkụ mmiri. Ọrụ nke akụkụ mmiri ahụ bụ ịpịpụta igwe mmiri nnu n'ime ụlọ nnwale ahụ site na compressor ikuku. Akụkụ mmiri ahụ nwere ihe ndị na-atụ okpomọkụ, nke na-achọpụta okpomọkụ dị n'ime ụlọ nnwale ahụ. Akụkụ njikwa ahụ nwere obere kọmputa, nke na-ejikọ akụkụ mmiri ahụ na akụkụ mmiri ahụ iji chịkwaa usoro nnwale ahụ dum. A na-etinye sistemụ ọkụ n'ime ụlọ nnwale mmiri nnu iji mee ka ìhè anyanwụ dị. Sistemụ ọkụ ahụ nwere oriọna infrared na njikwa oge. N'otu oge ahụ, a na-etinye ihe mmetụta okpomọkụ n'ime ụlọ nnwale mmiri nnu iji nyochaa okpomọkụ gburugburu ihe nlele ahụ n'oge.
A haziri ihe nlele nchara nrụgide n'okpuru ibu na-adịgide adịgide dịka NACETM0177-2005 si dị (Nnwale ụlọ nyocha nke mgbawa nrụgide Sulfide na nguzogide nrụrụ nrụgide nke ọla na gburugburu H2S). E buru ụzọ hichaa ihe nlele nchara nrụgide na acetone na nhicha igwe ultrasonic iji wepụ ihe fọdụrụ na mmanụ, wee tee ya mmiri na mmanya ma kpọọ nkụ na oven. Wee tinye ihe nlele dị ọcha n'ime ụlọ nnwale nke ngwaọrụ nnwale nnu iji mee ka ọnọdụ nchara dị na gburugburu ihu igwe dị mmiri mmiri nke Chongqing. Dịka ọkọlọtọ NACETM0177-2005 na ọkọlọtọ nnwale nnu GB/T 10,125-2012 si dị, oge ule nrụrụ nrụgide nrụgide ibu na-adịgide adịgide na ọmụmụ ihe a ka ekpebisiri ike na ọ ga-abụ awa 168. Emere ule nrụgide na ihe nlele nchara n'okpuru ọnọdụ nchara dị iche iche na igwe nnwale nrụgide zuru ụwa ọnụ nke MTS-810, a nyochaakwara ihe onwunwe igwe ha na ọdịdị nchara mgbawa.
Foto nke 1 na-egosi macro- na micro-morphology nke nchara elu nke ihe nlele nchara siri ike nke nwere nrụgide bolt siri ike n'okpuru ọnọdụ nchara dị iche iche.2 na 3 n'otu n'otu.
Ụdị ihe atụ nke ihe nlele nchara nrụgide nke 20MnTiB nwere ike dị elu n'okpuru gburugburu nchara dị iche iche: (a) enweghị nchara; (b) ugboro 1; (c) 20 ×; (d) 200 ×; (e) pH3.5; (f) pH 7.5; (g) 50°C.
Micromorphology nke ngwaahịa nchara nke 20MnTiB nwere ike dị elu na gburugburu nchara dị iche iche e ji ihe atụ mee (100×): (a) ugboro 1; (b) 20 ×; (c) 200 ×; (d) pH3.5; (e) pH7 .5; (f) 50°C.
A pụrụ ịhụ ya site na Fig. 2a na elu nke ihe nlele bolt siri ike nke na-adịghị emebi emebi na-egosipụta ìhè ọla na-egbuke egbuke na-enweghị nchara doro anya. Agbanyeghị, n'okpuru ọnọdụ nke ihe ngwọta nchara mbụ a na-emebu (Fig. 2b), elu nke ihe nlele ahụ kpuchiri akụkụ ụfọdụ na ngwaahịa nchara agba aja aja na-acha uhie uhie, ebe ụfọdụ akụkụ nke elu ahụ ka gosipụtara ìhè ọla doro anya, na-egosi na naanị ụfọdụ akụkụ nke elu ihe nlele ahụ rere ntakịrị, na ngwọta nchara a na-emebu enweghị mmetụta ọ bụla n'elu ihe nlele ahụ. Ihe onwunwe enweghị mmetụta dị ukwuu. Agbanyeghị, n'okpuru ọnọdụ nke 20 × ihe ngwọta nchara mbụ emere (Foto 2c), elu nke ihe nlereanya bolt siri ike ekpuchila kpamkpam site na nnukwu ngwaahịa nchara tan na obere obere ngwaahịa nchara aja aja-acha uhie uhie, ahụghị ihe na-egbuke egbuke ọla edo doro anya, enwerekwa obere ngwaahịa nchara aja aja-ojii dị nso na elu nke substrate ahụ. Na n'okpuru ọnọdụ nke 200 × ihe ngwọta nchara mbụ emere emere eme (Foto 2d), elu nke ihe nlereanya ahụ kpuchiri kpamkpam site na ngwaahịa nchara aja aja, na ngwaahịa nchara aja aja-oji na-apụta n'ebe ụfọdụ.
Ka pH ahụ belatara ruo 3.5 (Foto 2e), ngwaahịa nchara agba aja aja bụ ihe kachasị n'elu ihe nlele ahụ, e gbupụkwara ụfọdụ ngwaahịa nchara ahụ.
Foto 2g na-egosi na ka okpomọkụ na-arị elu ruo 50 Celsius, ọdịnaya nke ngwaahịa nchara aja aja na-acha uhie uhie n'elu ihe nlele ahụ na-ebelata nke ukwuu, ebe ngwaahịa nchara aja aja na-egbuke egbuke na-ekpuchi elu ihe nlele ahụ n'ebe buru ibu. Ihe mkpuchi ngwaahịa nchara ahụ dịtụ nro, a na-ewepụkwa ụfọdụ ngwaahịa aja aja-ojii.
Dịka egosiri na Foto nke 3, n'okpuru gburugburu ebe obibi dị iche iche, ngwaahịa nchara dị n'elu ihe nlele nchara 20MnTiB siri ike na-apụta ìhè, ọkpụrụkpụ nke oyi akwa nchara na-abawanye ka mmụba nke mkpokọta nke ngwọta nchara a na-emebu. N'okpuru ọnọdụ nke ngwọta nchara a na-emebu (Fig. 3a), enwere ike kewaa ngwaahịa nchara dị n'elu ihe nlele ahụ n'ime akwa abụọ: oyi akwa kachasị elu nke ngwaahịa nchara na-ekesa nke ọma, mana ọtụtụ mgbawa na-apụta; oyi akwa dị n'ime bụ otu ìgwè ngwaahịa nchara. N'okpuru ọnọdụ nke 20 × nhazi ngwọta nchara mbụ (Fig. 3b), enwere ike kewaa oyi akwa nchara dị n'elu ihe nlele ahụ n'ime akwa atọ: oyi akwa kachasị elu bụ ngwaahịa nchara klaasị gbasaara agbasa, nke na-adịghị emegharị ma na-agbagharị agbagharị, ma enweghị ezigbo arụmọrụ nchebe; oyi akwa etiti bụ oyi akwa ngwaahịa nchara otu, mana enwere mgbawa doro anya, ion nchara nwere ike ịgafe mgbawa ma mebie ihe ndabere ahụ; oyi akwa dị n'ime bụ oyi akwa ngwaahịa nchara siri ike nke na-enweghị mgbawa doro anya, nke nwere mmetụta nchebe dị mma na substrate ahụ. N'okpuru ọnọdụ nke 200 × nhazi ngwọta nchara mbụ emere (Foto 3c), enwere ike kewaa oyi akwa nchara dị n'elu ihe nlele ahụ n'ime akwa atọ: oyi akwa kachasị dị n'èzí bụ oyi akwa ngwaahịa nchara dị gịrịgịrị ma dị otu; oyi akwa etiti bụkarị nchara dị ka petal na nke dị ka flake. Oyi akwa dị n'ime bụ oyi akwa ngwaahịa nchara siri ike nke na-enweghị mgbawa na oghere doro anya, nke nwere mmetụta nchebe dị mma na substrate ahụ.
A pụrụ ịhụ ya site na Fig. 3d na n'ime gburugburu ebe a na-eme ka ọ dị nro nke pH 3.5, e nwere ọtụtụ ngwaahịa nchara dị ka agịga n'elu ihe atụ bolt siri ike nke 20MnTiB. A na-eche na ngwaahịa nchara ndị a bụkarị γ-FeOOH na obere α-FeOOH nke e tinyere n'ime ya26, oyi akwa nchara ahụ nwekwara mgbawa doro anya.
A pụrụ ịhụ site na Fig. 3f na mgbe okpomọkụ ahụ ruru 50 Celsius, ahụghị akwa nchara dị n'ime nke dị oke omimi n'ime usoro ihe owuwu nke ihe owuwu ahụ, nke na-egosi na e nwere oghere dị n'etiti akwa nchara na 50 Celsius, nke mere ka ihe owuwu ahụ ghara ikpuchi kpamkpam site na ngwaahịa nchara. Na-enye nchebe megide mmụba nke oke nchara nke ihe owuwu ahụ.
E gosipụtara ihe ndị dị na sistemụ nke bolts siri ike n'okpuru nrụrụ nrụgide na-adịgide adịgide n'ebe dị iche iche na-emebi ihe na Tebụl 2:
Enwere ike ịhụ site na Tebụl nke Abụọ na ihe ndị dị na igwe nke ihe nlele bolt dị elu nke 20MnTiB ka na-emezu ihe achọrọ maka ọkọlọtọ mgbe usoro akọrọ-mmiri anwalela nchara ngwa ngwa na gburugburu nchara dị iche iche, mana enwere mmebi ụfọdụ ma e jiri ya tụnyere ndị na-adịghị emebi emebi. Nlereanya. Mgbe ntinye nke ihe ngwọta nchara mbụ ahụ, ihe ndị dị na igwe nke ihe nlele ahụ agbanweghị nke ukwuu, mana na ntinye 20 × ma ọ bụ 200 × nke ihe ngwọta ahụ a tụrụ atụ, ịgbatị nke ihe nlele ahụ belatara nke ukwuu. Ihe ndị dị na igwe yiri ya na ntinye nke ihe ngwọta nchara mbụ nke 20 × na 200 ×. Mgbe uru pH nke ihe ngwọta nchara ahụ dara ruo 3.5, ike nrụgide na ogologo nke ihe nlele ahụ belatara nke ukwuu. Mgbe okpomọkụ rịrị elu ruo 50°C, ike nrụgide na ogologo belatara nke ukwuu, ọnụego mbelata mpaghara ahụ dịkwa nso na uru ọkọlọtọ.
E gosiri ụdị mgbawa nke ihe nlele nchara nke 20MnTiB dị elu n'okpuru gburugburu nchara dị iche iche na Foto nke 4, nke bụ macro-morphology nke mgbawa ahụ, mpaghara eriri dị n'etiti mgbawa ahụ, egbugbere ọnụ micro-morphological nke njikọ shear, na elu nke ihe nlele ahụ.
Ụdị mgbawa dị iche iche nke ihe atụ bolt siri ike nke 20MnTiB n'ebe dị iche iche e ji ígwè rụọ (500×): (a) enweghị nchara; (b) ugboro 1; (c) 20 ×; (d) 200 ×; (e) pH3.5; (f) pH7.5; (g) 50°C.
Enwere ike ịhụ site na Fig. 4 na mgbawa nke ihe nlele nchara 20MnTiB dị elu n'okpuru gburugburu corrosion dị iche iche na-egosi mgbawa cup-cone nkịtị. Ma e jiri ya tụnyere ihe nlele ahụ na-adịghị emebi emebi (Fig. 4a), mpaghara etiti nke mgbawa mpaghara eriri dị obere. , mpaghara egbugbere ọnụ shear dị ukwuu. Nke a na-egosi na ihe onwunwe nke ihe ahụ mebiri emebi nke ukwuu mgbe corrosion gasịrị. Site na mmụba nke njupụta corrosion e mere ka ọ dị nro, olulu ndị dị na mpaghara eriri dị n'etiti mgbawa ahụ mụbara, akwa akwa doro anya pụtara. Mgbe njupụta ahụ mụbara ruo ugboro 20 nke ngwọta corrosion e mere ka ọ dị nro mbụ, olulu corrosion doro anya pụtara na njikọ dị n'etiti ọnụ ọnụ egbugbere ọnụ shear na elu nke ihe nlele ahụ, e nwekwara ọtụtụ ngwaahịa corrosion n'elu. sample.
A chọpụtara site na Foto 3d na e nwere mgbawa doro anya na oyi akwa nchara n'elu ihe nlele ahụ, nke na-enweghị mmetụta nchebe dị mma na matrix ahụ. Na ngwọta nchara nke pH 3.5 e mere ka ọ dị nro nke ukwuu (Foto 4e), elu ihe nlele ahụ gbawara agbawa nke ukwuu, mpaghara eriri etiti dịkwa obere. , E nwere ọtụtụ ihe ndọda na-adịghị mma n'etiti mpaghara eriri ahụ. Site na mmụba nke uru pH nke ngwọta nchara e mere ka ọ dị nro, mpaghara ndọda na mpaghara eriri dị n'etiti mgbawa ahụ na-ebelata, olulu ahụ na-ebelata nwayọ nwayọ, omimi olulu ahụ na-ebelatakwa nwayọọ nwayọọ.
Mgbe okpomọkụ ahụ ruru 50 Celsius (Foto 4g), mpaghara egbugbere ọnụ nke mgbawa nke ihe nlele ahụ bụ nke kachasị ukwuu, olulu ndị dị na mpaghara eriri etiti mụbara nke ukwuu, omimi olulu ahụ mụbakwara, njikọ dị n'etiti ọnụ ọnụ egbugbere ọnụ na elu ihe nlele ahụ mụbara. Ngwaahịa na olulu mụbara, nke gosipụtara usoro miri emi nke nchara substrate nke gosipụtara na Fig. 3f.
Uru pH nke ngwọta nchara ga-emebi ihe onwunwe nke 20MnTiB dị elu, mana mmetụta ya adịghị mkpa. Na ngwọta nchara nke pH 3.5, a na-ekesa ọtụtụ ngwaahịa nchara dị ka agịga n'elu ihe nlele ahụ, oyi akwa nchara ahụ nwekwara mgbawa doro anya, nke na-enweghị ike ịmepụta ezigbo nchekwa maka ihe ndabere ahụ. E nwekwara olulu nchara doro anya na ọtụtụ ngwaahịa nchara na ọdịdị microscopic nke mgbawa ihe nlele ahụ. Nke a na-egosi na ikike nke ihe nlele ahụ iguzogide mgbanwe site na ike mpụga na-ebelata nke ukwuu na gburugburu acidic, a na-amụbakwa ogo nke ọchịchọ nchara nrụgide nke ihe ahụ nke ukwuu.
Ngwọta nchara mbụ e ji mee ihe n'ụzọ dị nro enweghị mmetụta dị ukwuu n'ihe gbasara ihe nlereanya bolt siri ike, mana ka njupụta nke ngwọta nchara e ji mee ihe n'ụzọ dị nro mụbara ruo ugboro iri abụọ karịa nke ngwọta nchara e ji mee ihe n'ụzọ dị iche iche, ihe ndị e ji mee ihe n'ụzọ dị iche iche mebiri emebi nke ukwuu, e nwekwara nchara doro anya na obere nhazi mgbawa. Ọgba, mgbawa nke abụọ na ọtụtụ ngwaahịa nchara. Mgbe e mụbara njupụta nke ngwọta nchara e ji mee ihe n'ụzọ dị iche site na ugboro iri abụọ ruo ugboro narị abụọ nke njupụta nke ngwọta nchara e ji mee ihe n'ụzọ dị iche, mmetụta nke njupụta nke ngwọta nchara na ihe ndị e ji mee ihe n'ụzọ dị iche iche nke ihe ahụ ebelatara.
Mgbe okpomọkụ nchara a na-eme ihe atụ dị 25℃, ike mmepụta na ike nrụgide nke ihe nlele bolt dị elu nke 20MnTiB anaghị agbanwe nke ukwuu ma e jiri ya tụnyere ihe atụ ndị a na-emebeghị eme ihe. Agbanyeghị, n'okpuru okpomọkụ gburugburu ebe obibi nchara a na-eme ihe atụ nke 50 °C, ike nrụgide na ogologo nke ihe nlele ahụ belatara nke ukwuu, ọnụego mbelata nke ngalaba dị nso na uru ọkọlọtọ, egbugbere ọnụ shear fracture bụ nke kachasị ukwuu, e nwekwara dimples na mpaghara eriri etiti. Mmụba dị ukwuu, omimi olulu mụbara, ngwaahịa nchara na olulu nchara mụbara. Nke a na-egosi na gburugburu ebe obibi nchara okpomọkụ nwere nnukwu mmetụta na ihe onwunwe nke bolt dị elu, nke na-apụtaghị ìhè na okpomọkụ ụlọ, mana ọ dị mkpa karịa mgbe okpomọkụ ruru 50 °C.
Mgbe ule nchara dị ngwa ngwa nke ime ụlọ mere ka gburugburu ebe obibi dị na Chongqing yie ihe na-eme, ike nrụgide, ike mmepụta, ogologo oge na paramita ndị ọzọ nke 20MnTiB nwere ike dị elu belatara, mmebi nrụgide doro anya mekwara. Ebe ọ bụ na ihe ahụ nọ n'okpuru nrụgide, a ga-enwe nnukwu ihe na-eme ka nchara dị ngwa ngwa. N'ihi mmetụta nke nrụgide na olulu nchara, ọ dị mfe ime ka plastik doo anya mebie bolts ike dị elu, belata ikike iguzogide mgbanwe site na ike mpụga, ma mee ka ọchịchọ nke nchara nrụgide dịkwuo elu.
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