Kuwonongeka ndi kuwonongeka kapena kuwonongeka kwa zinthu kapena katundu wawo chifukwa cha chilengedwe. Zimbiri zambiri zimachitika mumlengalenga, zomwe zimakhala ndi zinthu zowononga komanso zowononga monga mpweya, chinyezi, kusintha kwa kutentha ndi zowononga.
Cyclic Corrosion ndiwofala komanso wowononga kwambiri mumlengalenga. Cyclic dzimbiri dzimbiri padziko zitsulo zipangizo chifukwa ma chloride ayoni zili pamwamba zitsulo oxidized wosanjikiza ndi zoteteza wosanjikiza wa zitsulo pamwamba malowedwe ndi mkati zitsulo electrochemical anachita chifukwa. Pa nthawi yomweyo, ayoni klorini muli ena hydration mphamvu, zosavuta adsorbed mu pores a pamwamba zitsulo, ming`alu odzaza ndi m`malo mpweya mu okusayidi wosanjikiza, oxides insoluble mu sungunuka mankhwala enaake, kuti passivation wa dziko lapansi kukhala pamwamba yogwira.
Mayeso a Cyclic Corrosion ndi mtundu woyesera zachilengedwe makamaka pogwiritsa ntchito zida zoyesera za Cyclic Corrosion kuti apange kayeseleledwe kazachilengedwe ka Cyclic Corrosion chilengedwe kuti awone kukana kwa dzimbiri kwa zinthu kapena zitsulo. Imagawidwa m'magulu awiri, limodzi la kuyesa kwachilengedwe kwa chilengedwe, lina la kuyesa kwachilengedwe kofulumira kwa mayeso a chilengedwe cha Cyclic Corrosion.
Kuyeserera kochita kupanga kwa Cyclic Corrosion kuyesa kwa chilengedwe ndikugwiritsa ntchito kuchuluka kwa zida zoyezera mlengalenga - Chipinda choyesera cha Cyclic Corrosion (Chithunzi), mu kuchuluka kwake kwa danga ndi njira zopangira, zomwe zimapangitsa kuti pakhale malo a Cyclic Corrosion kuti awone momwe zinthu zimakanira kukana kwa dzimbiri kwa Cyclic Corrosion.
Imafananizidwa ndi chilengedwe, mchere wa chloride wa chilengedwe chake cha Cyclic Corrosion, ukhoza kukhala kangapo kapena kambirimbiri chilengedwe chachilengedwe cha Cyclic Corrosion, kotero kuti chiwopsezo cha dzimbiri chikuchulukirachulukira, mayeso a Cyclic Corrosion pamankhwala, nthawi yopeza zotsatira imafupikitsidwanso kwambiri. Monga momwe chilengedwe chimakhalira poyesa zitsanzo zachitsanzo, kuti chiwonongeko chake chikhoza kutenga chaka chimodzi, pamene mukuyerekezera zinthu zachilengedwe za Cyclic Corrosion, malinga ngati maola 24, mukhoza kupeza zotsatira zofanana.
Laboratory yoyeseza Cyclic Corrosion itha kugawidwa m'magulu anayi
(1)Neutral Cyclic Corrosion Test (mayeso a NSS)ndi njira yoyeserera ya dzimbiri yofulumira yomwe idawoneka koyambirira ndipo ndiyomwe imagwiritsidwa ntchito kwambiri pakadali pano. Amagwiritsa ntchito 5% sodium chloride saline solution, yankho la PH losinthidwa mumtundu wosalowerera (6.5 ~ 7.2) ngati yankho la kupopera mbewu mankhwalawa. Kutentha kwa mayeso kumatengedwa 35 ℃, kukhazikika kwa zofunikira za Cyclic Corrosion mu 1 ~ 2ml/80cm / h.
(2)Acetic acid Cyclic Corrosion test (mayeso a ASS)amapangidwa pamaziko a ndale Cyclic Corrosion mayeso. Ndi kuwonjezera ena glacial acetic asidi mu 5% sodium kolorayidi njira, kotero kuti PH mtengo wa yankho kuchepetsedwa pafupifupi 3, yankho limakhala acidic, ndipo mapangidwe omaliza a Cyclic Corrosion amasinthidwanso ku ndale Cyclic Corrosion kukhala acidic. Kuchuluka kwake kwa dzimbiri ndi pafupifupi 3 nthawi mwachangu kuposa mayeso a NSS.
(3)Mchere wamkuwa wachulukitsa acetic acid Cyclic Corrosion test (CASS test)ndi mayeso omwe angopangidwa kumene akunja othamanga a Cyclic Corrosion, kutentha kwa 50 ℃, mchere wamchere wokhala ndi mchere wamkuwa wochepa - mkuwa wa chloride, womwe umapangitsa dzimbiri. Mlingo wake wa dzimbiri ndi pafupifupi nthawi 8 kuposa mayeso a NSS.
(4)Alternating Cyclic Corrosion testndi mayeso ozama a Cyclic Corrosion, omwe kwenikweni ndi mayeso osalowerera ndale a Cyclic Corrosion kuphatikiza chinyezi chosalekeza komanso kuyesa kutentha. Amagwiritsidwa ntchito kwambiri pazinthu zamtundu wamtundu wonse, kudzera pakulowa kwachinyontho, kotero kuti Cyclic Corrosion singopangidwa pamwamba pa chinthucho, komanso mkati mwazogulitsa. Ndiwopangidwa mu Cyclic Corrosion ndi kutentha kwachinyezi kuwiri kwachilengedwe mosinthana, ndipo pomaliza amawunika mphamvu zamagetsi ndi makina a chinthu chonsecho ndikusintha kapena popanda kusintha.
Zotsatira zoyezetsa za Cyclic Corrosion nthawi zambiri zimaperekedwa mwanjira yabwino osati yochulukira. Pali njira zinayi zenizeni zoweruzira.
①rating chiweruzo njirandi dera la dzimbiri ndi gawo lonse la chiŵerengero cha peresenti molingana ndi njira ina yogawanitsa m'magulu angapo, kufika pamlingo wina monga chigamulo choyenerera, ndi choyenera kwa zitsanzo zathyathyathya zowunika.
②kuyeza njira ya chiweruzondi kudzera kulemera kwa chitsanzo isanayambe ndi itatha dzimbiri mayeso masekeli njira, kuwerengera kulemera kwa imfa ya dzimbiri kuweruza khalidwe la chitsanzo kukana dzimbiri, makamaka oyenera kuwunika zitsulo kukana dzimbiri khalidwe.
③njira yodziwira mawonekedwe owonongekandi njira yodziwira bwino, ndi mayeso a Cyclic Corrosion, ngati mankhwalawo amatulutsa zochitika zowonongeka kuti adziwe chitsanzo, mfundo zamagulu zimagwiritsidwa ntchito kwambiri m'njira imeneyi.
④corrosion data statistical analysis njiraimapereka mapangidwe a mayeso a dzimbiri, kusanthula deta ya dzimbiri, deta ya dzimbiri kuti adziwe kuchuluka kwa chidaliro cha njirayo, yomwe imagwiritsidwa ntchito makamaka kusanthula, kuwonongeka kwa ziwerengero, m'malo mwachigamulo chamtundu wina wazinthu.
Cyclic Corrosion kuyezetsa kwachitsulo chosapanga dzimbiri
Mayeso a Cyclic Corrosion adapangidwa koyambirira kwa zaka za m'ma 2000, ndiye njira yayitali kwambiri yoyesera "kuyesa kwa dzimbiri", kukomera kwa ogwiritsa ntchito zinthu zosagwirizana ndi dzimbiri, kwakhala kuyesa "padziko lonse lapansi". Zifukwa zazikulu ndi izi: ① kusunga nthawi; ② mtengo wotsika; ③ akhoza kuyesa zipangizo zosiyanasiyana; ④ zotsatira zake ndi zophweka komanso zomveka bwino, zokomera kuthetsa mikangano yamalonda.
M'zochita, kuyesa kwa Cyclic Corrosion kwachitsulo chosapanga dzimbiri ndi komwe kumadziwika kwambiri - ndi maola angati omwe angayese mayeso a Cyclic Corrosion? Othandizira sayenera kukhala achilendo ku funso ili.
Ogulitsa zinthu nthawi zambiri amagwiritsa ntchitochisangalalochithandizo kapenakusintha pamwamba kupukuta kalasi, etc., kukonza nthawi yoyeserera ya Cyclic Corrosion yachitsulo chosapanga dzimbiri. Komabe, chinthu chovuta kwambiri chodziwikiratu ndi kapangidwe ka chitsulo chosapanga dzimbiri, mwachitsanzo, zomwe zili mu chromium, molybdenum ndi faifi tambala.
Zomwe zili m'maelementi awiriwa, chromium ndi molybdenum zimakwera, m'pamenenso dzimbiri zimafunika kuti zithetse kutsekeka komanso kuti dzimbiri ziyambe kuwonekera. Kukana kwa dzimbiri kumeneku kumawonetsedwa ndi zomwe zimatchedwaPitting Resistance Kufanana(PRE) mtengo: PRE = %Cr + 3.3 x %Mo.
Ngakhale faifi tambala simawonjezera kukana kwa chitsulo pakubowola ndi kung'ambika, imatha kuchedwetsa pang'onopang'ono kuwonongeka kwa dzimbiri zitayamba. Zitsulo zosapanga dzimbiri zomwe zimakhala ndi faifi tambala zimachita bwino kwambiri pakuyesa kwa Cyclic Corrosion, ndipo zimawononga kwambiri kuposa zitsulo zosapanga dzimbiri za nickel ferritic zosapanga dzimbiri zokhala ndi mphamvu yofanana yolimbana ndi dzimbiri.
Trivia: Pa standard 304, ndale Cyclic Corrosion nthawi zambiri imakhala pakati pa maola 48 ndi 72; pa muyezo 316, ndale Cyclic Corrosion nthawi zambiri amakhala pakati pa 72 ndi 120 maola.
Izo ziyenera kudziŵika kutindiCyclic Corrosionmayeso ali ndi zovuta zazikulu poyesa zinthu zachitsulo chosapanga dzimbiri.Ma chloride a Cyclic Corrosion mu mayeso a Cyclic Corrosion ndi okwera kwambiri, kuposa malo enieni, kotero kuti chitsulo chosapanga dzimbiri chomwe chitha kukana dzimbiri m'malo ogwiritsira ntchito omwe ali ndi chloride yotsika kwambiri chidzakhalanso chambiri mu mayeso a Cyclic Corrosion.
Mayeso a Cyclic Corrosion amasintha machitidwe a dzimbiri achitsulo chosapanga dzimbiri, sangatengedwe ngati kuyesa kofulumira kapena kuyesa koyerekeza. Zotsatira zake zimakhala za mbali imodzi ndipo zilibe chiyanjano chofanana ndi ntchito yeniyeni ya chitsulo chosapanga dzimbiri chomwe chimagwiritsidwa ntchito potsiriza.
Chifukwa chake titha kugwiritsa ntchito mayeso a Cyclic Corrosion kuti tifananize kukana kwa dzimbiri kwamitundu yosiyanasiyana yazitsulo zosapanga dzimbiri, koma mayesowa amangoyesa zinthuzo. Posankha zipangizo zazitsulo zosapanga dzimbiri makamaka, kuyesa kwa Cyclic Corrosion kokha sikumapereka chidziwitso chokwanira, chifukwa sitikhala ndi chidziwitso chokwanira cha kugwirizana pakati pa mayesero ndi malo enieni ogwiritsira ntchito.
Pachifukwa chomwecho, sizingatheke kuyerekezera moyo wautumiki wa chinthu chongotengera mayeso a Cyclic Corrosion a chitsanzo chachitsulo chosapanga dzimbiri.
Kuonjezera apo, sizingatheke kufananitsa mitundu yosiyanasiyana ya zitsulo, mwachitsanzo, sitingathe kuyerekeza zitsulo zosapanga dzimbiri ndi zitsulo zokhala ndi mpweya wa carbon, chifukwa njira zowonongeka za zipangizo ziwiri zomwe zimagwiritsidwa ntchito poyesa ndizosiyana kwambiri, ndipo mgwirizano pakati pa zotsatira zoyesa ndi malo enieni omwe mankhwalawa adzagwiritsidwa ntchito si ofanana.
Nthawi yotumiza: Nov-06-2023