Mawu Oyamba
M'malo ofunikira a uinjiniya wamagetsi amadzimadzi, zigawozo zimakumana ndi kuphatikizika koopsa kwa mphamvu zamkati ndi zakunja. Ngakhale mainjiniya amathera nthawi yochuluka kuwerengera kuchuluka kwa zovuta zogwirira ntchito, kuthamanga kwamadzimadzi, komanso kuthamanga kwamadzi, pali chiwopsezo chowononga, chosawoneka chomwe chimagwira ntchito pamlingo wocheperako: dzimbiri. Kusiyidwa, kuwonongeka kwazinthu zazitsulo kumatha kusintha makina opangidwa bwino kwambiri a hydraulic kukhala chiwopsezo chodumphira, chowopsa, komanso chosagwira ntchito.
Zida zachitsulo zokhazikika za kaboni zimadalira zokutira zachiphamaso, zoperekera nsembe monga zokutira zinki kuti zipewe kuwonongeka kwa chilengedwe. Komabe, pansi pa kupsinjika kosalekeza kwa kugwedezeka kwa makina, kufutukuka kwa matenthedwe, ndi kutuluka kwa tinthu ting'onoting'ono, zokutirazi pamapeto pake zimakhala zopyapyala, zosweka, kapena kuphulika. Chitsulo chapansicho chikakumana ndi chinyezi ndi mpweya, dzimbiri limagwira mwachangu kwambiri, ndikufalikira pamalo omata ndikutafuna ulusi.
Pofuna kuthetsa kusatetezeka kumeneku, makampani amakono amatembenukira kuzitsulo. Kusankha premium stainless steel hydraulic product-monga high-pressure fitting, a instrumentation valve, adapter, or cylinder housing-kumapereka chitetezo chachibadwa, chodzitetezera kuti chisawonongeke. Koma kodi chitsulo chodabwitsachi chimakaniza bwanji mphamvu zosakanikirana za okosijeni, kuwononga asidi, ndi kutenthedwa ndi madzi amchere? Yankho lagona pa kugwirizana kochititsa chidwi kwa sayansi ya zinthu, uinjiniya wa mankhwala, ndi kukhazikika kwa kamangidwe. Nkhaniyi ikufotokoza mwatsatanetsatane njira zasayansi zomwe zimalola kuti zida za hydraulic zitsulo zosapanga dzimbiri zikhale dzimbiri{{6}zaulere komanso zosamveka bwino m'malo osakhululuka padziko lapansi.
Science of the Passive Layer: Stainless Steel's Secret Weapon
Kuti timvetsetse momwe chitsulo chosapanga dzimbiri chimadzitetezera ku dzimbiri, choyamba munthu ayenera kuchotsa malingaliro olakwika omwe amadziwika bwino: chitsulo chosapanga dzimbiri sichinthu chimodzi, chosasunthika ngati golide kapena platinamu. Ndi aloyi yogwira ntchito kwambiri yopangidwa ndi chitsulo, kaboni, ndi gulu lofunikira lazinthu zowonjezera. Kukhoza kwake kukana dzimbiri kwenikweni ndi chifukwa cha kachitidwe kopitirizabe, kolamulirika kwambiri kochitika pamwamba pake.
Chomwe chimayambira mu chemistry yoteteza iyi ndi chromium. Kuti atchulidwe ngati chitsulo chosapanga dzimbiri, aloyiyo iyenera kukhala ndi 10.5 peresenti ya chromium polemera. Iron yaiwisi ikakumana ndi chinyezi ndi mpweya, imapanga iron oxide, yomwe imadziwika kuti dzimbiri lofiira. Dzimbiri lofiira limakhala lotayirira, lopangidwa ndi porous crystalline lomwe limakulirakulirabe ndikutuluka kutali ndi chitsulo. Kuphulika uku kumawonetsa chitsulo chatsopano chomwe chili pansi, ndikupangitsa kuti pakhale chiwonongeko, chotsika chomwe chimasungunula chigawocho kwathunthu.
Chromium imalembanso zolemba zamankhwala izi. Ma atomu a chromium akalowa mkati mwa chitsulo chosapanga dzimbiri cha hydraulic hydraulic alumikizana ndi mpweya wozungulira, amachita kupanga filimu yopyapyala yosawoneka bwino yotchedwa chromium oxide. Filimuyi ndi yokhuthala pang'ono chabe-kwakuti kuwala kumadutsa molunjika, zomwe zimapangitsa kuti chitsulo chonyezimira chiziwoneka bwino.
Filimu ya chromium oxide iyi imadziwika kuti passive layer. Mosiyana ndi dzimbiri lofiyira, zinthuzo ndi zowundidwa modabwitsa, zokhazikika, komanso zosakhala bwino-zobowola. Zimagwira ntchito ngati zida zankhondo zosalowetsedwa, zazing'ono kwambiri zomwe zimalepheretsa mamolekyu a okosijeni ndi madzi kuti asafikenso pamaatomu achitsulo omwe ali pansi pake.
Chochititsa chidwi kwambiri, wosanjikizawu ndi wokhazikika komanso wodzichiritsa wekha-. Pamalo olemera-ma hydraulic, zoikamo ndi mavavu amakandidwa nthawi ndi nthawi ndi zinyalala zakugwa, kukhwasulidwa ndi mazenera akamakonza movutikira, kapena kukokoloka kwamkati chifukwa{3}}kuthamanga kwamafuta kwamphamvu. Mu gawo lokhazikika, kukanda kwakuya kumayimira kusweka kwa zida zankhondo, kuwonetsa kuyambika kwa dzimbiri. Ndi chitsulo chosapanga dzimbiri, ngati chosanjikizacho chikandedwa kapena kuchotsedwa, maatomu a chromium omwe angotuluka kumene nthawi yomweyo amalumikizana ndi mpweya wozungulira kuti amangenso chotchinga cha chromium oxide mkati mwa milliseconds. Kusinthika kosalekeza kumeneku kumatsimikizira kuti njira yamadzimadzi imakhalabe yosindikizidwa motsutsana ndi chilengedwe kwa moyo wake wonse wogwira ntchito.
Ma Alloying Agents ndi Chitetezo Chawo Chokhazikika
Ngakhale chromium imapanga maziko oyambira osanjikiza, makina opangira ma hydraulic nthawi zambiri amakumana ndi malo ovuta omwe amafunikira kulimbikitsidwa kowonjezereka. Kuti athane ndi zovuta izi, akatswiri a metallurgists amalowetsa zinthu zachiwiri za alloying mu crystalline matrix, ndikupanga magiredi odziwika bwino amitundu ina yachitetezo.
Chowonjezera choyamba chachikulu ndi faifi tambala. Muzitsulo zosapanga dzimbiri zodziwika bwino za 300-series austenitic zomwe zimagwiritsidwa ntchito kwambiri pamagetsi amadzimadzi, faifi tambala imayambika mokhazikika kuyambira 8 mpaka 14 peresenti. Kuchokera pamakina, nickel amasintha mawonekedwe a crystalline achitsulo, kuwasintha kuchoka ku ferritic kupita ku austenitic. Kusintha kwazitsulo kumeneku kumawonjezera kwambiri kulimba kwachitsulo, ductility, ndi kusungunuka kwapangidwe. Zimathandizanso kuti zinthuzo zisamachite dzimbiri zofananira, makamaka zikakumana ndi ma acid ochepa komanso mayankho amankhwala amakampani.
Komabe, wopambana weniweni wa madera ovuta kwambiri a hydraulic ndi molybdenum. Chitsulo chosapanga dzimbiri cha Grade 304 chimateteza bwino kwambiri ku chinyezi cha mumlengalenga, koma chimatha kuvutika chikalowa kwambiri m'madzi a m'nyanja, mumpweya wa m'mphepete mwa nyanja, ndi{2}}mumchere wa icing. Ma chloride ayoni ndi ankhanza mwapadera; amatha kulowa ndi kusungunula wosanjikiza wa chromium oxide passive layer, kupangitsa kuwonongeka komweko.
Pofuna kuthana ndi chiwopsezochi, chitsulo chosapanga dzimbiri cha Gulu 316 chimaphatikizapo kuwonjezera 2 mpaka 3 peresenti ya molybdenum. Molybdenum imagwira ntchito ngati chinthu chokhazikika, chomwe chimawonjezera kukhazikika kwa filimuyi ndikupangitsa kuti filimuyo isagonje kwambiri ndi chloride{4}}. Kukweza kumodzi kumeneku ndiye chifukwa chake Gulu la 316 ndilofunika kwambiri pamapulatifomu obowola mafuta akunyanja, zombo zapamadzi, ndi mafakitale akugombe.
Pomaliza, kupanga zamakono kumayang'anitsitsa zomwe zili mu carbon. Chitsulo chosapanga dzimbiri chikatenthedwa kufika potentha kwambiri-monga pa kuwotcherera-pressure hydraulic flange-zodabwitsa zotchedwa carbide precipitation zimatha kuchitika. Ma chromium ndi maatomu a carbon amatha kumangika pamodzi m'malire ambewu yachitsulo, ndikuchotsa madera ozungulira ma chromium ofunikira kuti asasunthike. Izi zimasiya cholumikizira chowotcherera pachiwopsezo chambiri chambiri cha intergranular corrosion. Kuti athetse ngoziyi, opanga amagwiritsa ntchito{{7}zosiyanasiyana za carbon, zomwe zimatchedwa Giredi 304L kapena 316L. Pochepetsa mpweya wa kaboni wochepera 0.03 peresenti, mvula ya carbide imatetezedwa, kuwonetsetsa kuti zone yowotcherera imakhalabe dzimbiri{12}}mofanana ndi zina zonse.
Kugonjetsa Mitundu Yachindunji ya Hydraulic Corrosion
Kuwonongeka kumawonekera m'njira zingapo zosiyana mkati mwa mphamvu yamadzimadzi. -Chitsulo chosapanga dzimbiri cha hayidiroliki chapamwamba kwambiri chapangidwa kuti chitha kuthana ndi ziwopsezo izi.
Uniform Corrosion
Kuwonongeka kwa yunifolomu kumayimira kufalikira, ngakhale kuwukira pamalo onse owonekera a chitsulo, zomwe zimapangitsa kuti pang'onopang'ono khoma lazinthu likhale lochepa pakapita nthawi. Pamzere wokwera{{1}wothamanga kwambiri wa hayidiroliki, kupatulira khoma ndi koopsa kwambiri, chifukwa kumatsitsa pang'onopang'ono kusagwira bwino ntchito kwa chitoliro mpaka kuphulika koopsa. Kusanjikiza kosalekeza kwa chitsulo chosapanga dzimbiri kumalepheretsa dzimbiri kuti zisawonongeke pamikhalidwe yokhazikika, ndikusunga makulidwe a khoma loyambirira ndi m'mphepete mwake munthawi yonse ya moyo wa gawolo.
Pitting ndi Crevice Corrosion
Kuwonongeka kwapang'onopang'ono ndi m'ming'alu ndi njira zowononga kwambiri, zobisika. Kubowola kumachitika pamene kabowo kakang'ono kamene kamatchingira chitetezo kamene kamapangitsa kabowo kakang'ono kwambiri kulowera mkati mwa khoma lachitsulo, lobisika kuti lisamawonedwe mwachisawawa. Ming'alu ya mng'anjo imachitika m'malo otsekeka kwambiri pomwe madzi amatha kuyimirira, monga mipata yaying'ono-pakatikati pa mbiri ya ulusi wokwerera kapena pansi pa chisindikizo cha flange.
Madzi otsalira akamachepa mpweya-, chemistry yake imasinthasintha, kukhala acidic kwambiri komanso kutafuna mwachangu kudzera muzitsulo zokhazikika. Kuwonjezedwa kwa molybdenum mu Grade 316 stainless steel layer kumapangitsa kuti mpweya ukhale wosasunthika m'kati{3}}zoni zomwe zatha, kulepheretsa maenjewo kuti asayambike.
Galvanic Corrosion
Galvanic corrosion imachitika pamene zitsulo ziwiri zosagwirizana ndi electrochemically zimalumikizana pamaso pa electrolyte, monga chinyezi kapena chinyezi chozungulira. Muzochitika izi, magetsi ang'onoang'ono amayenda pakati pa zitsulo, zomwe zimapangitsa kuti chitsulo chochepa kwambiri (anode) chiwonongeke mofulumira, pamene chitsulo cholemekezeka kwambiri (cathode) chimatetezedwa.
Chifukwa chitsulo chosapanga dzimbiri chimakhala pamwamba pa galvanic noble sikelo, chimalimbana kwambiri ndi zitsulo zoyandikana nazo. Komabe, mainjiniya ayenera kusamala: ngati cholumikizira chitsulo chosapanga dzimbiri chikulungidwa mu chipika chofewa cha aluminiyamu m'malo achinyezi, aluminiyumu imagwira ntchito ngati anode yoperekera nsembe ndikusweka mwachangu. Kuti izi zitheke, kamangidwe koyenera kamakina kamakhala kofanana ndi zitsulo pamakina onse kapena kugwiritsa ntchito-zotchinga zodzipatula zosagwirizana ndi njira kuti zithyole magetsi.
Zinthu Zachilengedwe: Kumene Kuteteza Chitsulo Chopanda chitsulo Ndikofunikira Kwambiri
Kukhazikika kwamphamvu kwamankhwala kwachitsulo chosapanga dzimbiri kumapangitsa kukhala chisankho chofunikira pamagawo angapo ogwirira ntchito ankhanza kwambiri.
Mu engineering ya m'madzi ndi m'mphepete mwa nyanja, makina opangira ma hydraulic amamenyedwa mosalekeza ndi mafunde, kupopera mchere wamchere, ndi chifunga chonyowa. Ma chloride ions omwe amapezeka m'madzi amchere amavula msanga zinc plating pazitsulo zazitsulo za carbon, zomwe zimapangitsa kuti dzimbiri liwonongeke pakangotha milungu ingapo. Zida zazitsulo zosapanga dzimbiri zimapirira mikhalidwe yapanyanjayi kwazaka zambiri osataya kukhulupirika kwawo, kuteteza zida zowongolera, ma crane apamtunda, ndi mavavu apansi pamadzi kuti asawonongeke mosadziwika bwino.
Momwemonso, malo opangira mankhwala ndi petrochemical ali ndi kusakanikirana koopsa koopsa kwachilengedwe. Mizere ya Hydraulic yomwe ikuyenda pafupi ndi zitsulo zomangira imatha kukhala ndi mpweya wa acidic, mankhwala a sulfure a caustic, ndi zosungunulira za organic. Zitsulo zokhazikika zokhazikika zimawonongeka mwachangu polimbana ndi mankhwalawa. Chitsulo chosapanga dzimbiri chimakhala chosasunthika kuzinthu zambiri zamafakitale, zomwe zimapangitsa kuti chikhale choyera, chopanda chilema ngakhale chimakhala chowonekera mosadukiza, mwachindunji.
Pomaliza, tiyenera kuyang'ana pazofunikira zotsukira zaukhondo m'mafakitale azakudya, zakumwa, ndi zamankhwala. M'magawo amenewa, makina amayenera kupopera nthawi zambiri-zitsulo zamphamvu kwambiri komanso zotsukira zothira chlorine kapena caustic soda kuti mabakiteriya asakule. Zigawo zazitsulo za kaboni zopukutidwa sizingapulumuke machitidwe aukhondo osakhazikika popanda kuphulika kapena dzimbiri, zomwe zimayika pachiwopsezo choipitsidwa ndi thupi ndi mankhwala pamzere wopanga. Chitsulo chosapanga dzimbiri chimakhala ndi malo osalala,{4}}opanda pobowole omwe amalimbana ndi kumatira kwachilengedwe komanso kupirira kutsukidwa kwaukhondo popanda kuwononga kapena kutulutsa zinyalala.
Kusunga Anti-Corrosive Integrity: Kukhazikitsa ndi Kusamalira Njira Zabwino Kwambiri
Kuwonetsetsa kuti chitsulo chosapanga dzimbiri chopangidwa ndi hydraulic chimapereka kukana kwa dzimbiri, njira zina zoyikapo ndi kukonza ziyenera kutsatiridwa mosamala ndi akatswiri akumunda.
Njira yoyamba yovuta imadziwika kuti passivation. Chitsulo chosapanga dzimbiri chikapangidwa ndi makina, ulusi, kapena kusindikizidwa panthawi yopanga, tinthu ting'onoting'ono tachitsulo chaulere kuchokera ku zida zodulira zimatha kulowa pamwamba pachitsulocho. Ngati sichitsatiridwa, tinthu tating'ono tachitsulo tambiri timene timatulutsa dzimbiri m'munda, ndikupanga mawonekedwe onyenga a kulephera kwa chigawocho ndipo mwina kusokoneza wosanjikiza wokhazikika.
Kuti izi zitheke, zida zomalizidwa zimathandizidwa ndi mankhwala ophatikizika, omwe amaphatikizapo kumiza mumadzi a nitric kapena citric acid. Kusambira kwa asidi kumeneku kumasungunula zowononga chitsulo chilichonse popanda kuwononga chitsulo chosapanga dzimbiri, ndikusiya malo abwino kwambiri, a chromium-olemera kwambiri omwe amawonjezera nthawi yomweyo filimu yoteteza.
Komanso, akatswiri azachipatala akuyenera kusamala kwambiri kuti apewe kuipitsidwa-panthawi yophatikiza. Ngati katswiri agwiritsa ntchito burashi ya waya ya carbon steel kuti atsuke ulusi wa valavu yachitsulo chosapanga dzimbiri, kapena akugwira zigawo zake ndi zida zachitsulo za dzimbiri, tinthu ta carbon steel timasamutsidwa pamalo osapanga dzimbiri, kuyambitsa dzimbiri. Zida zodzipatulira zosapanga dzimbiri zosapanga dzimbiri ndi njira zogwirira ntchito zoyera ndizofunikira kuti zinthuzo zikhale zoyera.
Pomaliza, akatswiri ayenera kuyang'anira chiwopsezo cha kuphulika kwa ulusi pakuyika. Chifukwa zitsulo zosapanga dzimbiri za austenitic zimakhala zofewa komanso zodumphira kwambiri, kukangana komwe kumabwera mukamanga ulusi wamphongo ndi wamkazi palimodzi pansi pa torque yayikulu kumatha kuchotsa wosanjikiza wa okusayidi. Popanda wosanjikizawu, makristalo achitsulo amatha kupakana, kupangitsa kutentha kwambiri komweko ndikupangitsa kuti ulusiwo uzizizira-kuwotcherera pamodzi. Kamodzi kagayidwe, cholumikiziracho chimakhala chokhomedwa kosatha ndipo chimatuluka ngati chikakamizidwa. Kuti vutoli lithe, akatswiri amayenera kuthira mafuta oletsa kupha anthu-nthawi zonse kapena ulusi wapamwamba kwambiri-wopangidwa makamaka pomanga zitsulo zosapanga dzimbiri, kuonetsetsa kuti makinawo akugwira ntchito komanso kuti asadutse-chisindikizo chaulere.
Mapeto
Kuthekera kwa zitsulo zosapanga dzimbiri za hydraulic hydraulic kukana kwathunthu mphamvu zowononga za dzimbiri ndi dzimbiri si nkhani yamwayi; ndiko kupambana kwachindunji kwa sayansi yazinthu zomwe zimayang'aniridwa. Popanga aloyi kuzungulira maziko olimba a chromium, nickel, ndi molybdenum, akatswiri a metallurgists apanga chinthu chomwe chingathe kudzipangira chokhachokhachokha,{1}}chopukutira zida zankhondo.
Kaya ndi wandiweyani, wosakhala-kapangidwe kake ka chromium oxide passive layer, chitetezo chomwe chimaperekedwa ndi molybdenum motsutsana ndi pitting ya chloride yamphamvu, kapena -mafuta otsika omwe amaletsa kuwonongeka kwa weld, mbali iliyonse ya chitsulo chosapanga dzimbiri cha hydraulic imapangidwira kwa nthawi yayitali{2}}
Ngakhale zida zina zitha kutsitsa mtengo wogulira poyamba, kuwonongeka kwawo kosalephereka ku kuwonongeka kwa chilengedwe nthawi zonse kumabweretsa nthawi yosayembekezereka yogwira ntchito, kuchucha kwamadzi okwera mtengo, komanso kuwopsa kwa chitetezo kwa ogwira ntchito yosamalira. Pomvetsetsa mfundo zakuya zasayansi zomwe zimateteza zitsulo zosapanga dzimbiri komanso kudzipereka kuti zigwire bwino ntchito ndikuyika ma protocol, mafakitale amakono amatha kuteteza mphamvu zamagetsi zamadzimadzi zomwe zimakhalabe zogwira mtima kwambiri, zoyera kotheratu, komanso zogwira ntchito mosatekeseka kwazaka zambiri zikubwerazi.
