1: Dab tsi yog cov qib thawj thiab cov lus qhia tshwj xeeb ntawm cov tooj liab nickel daim hlau siv hauv marine engineering, thiab lawv cov khoom sib txawv li cas rau cov ntawv thov tshwj xeeb?
Copper nickel plates hauv marine engineering feem ntau siv ob qib qauv: C70600 (90/10 Cu-Ni) thiab C71500 (70/30 Cu-}Ni), tswj hwm los ntawm cov kev qhia tshwj xeeb suav nrog ASTM B171, ASME SB171, thiab MIL{115}.
Lub C70600 (90/10) alloy muaj kwv yees li 90% tooj liab, 10% npib tsib xee, ntxiv rau kev ua tib zoo tswj cov hlau (1.0-1.8%) thiab manganese (0.5-1.0%). Cov khoom sib xyaw no muaj kev tiv thaiv zoo rau seawater corrosion, nruab nrab lub zog, thiab zoo fabricability. Nws yog feem ntau siv nyob rau hauv seawater piping systems, tshav kub exchanger plhaub, thiab marine nkoj hull plating qhov twg tsis kam mus biofouling thiab dav corrosion yog thawj kev txhawj xeeb.
C71500 (70/30) alloy, nrog kwv yees li 70% tooj liab thiab 30% npib tsib xee, ua kom pom lub zog zoo dua, txhim kho corrosion kuj, thiab kev ua tau zoo dua hauv siab - kev siv dej hiav txwv ceev. Nws cov ntsiab lus hlau ntxiv (0.4-1.0%) thiab manganese (1.0% siab tshaj) txhim kho kev tiv thaiv kev cuam tshuam thiab yaig-corrosion. Qib no pom muaj ntau daim ntawv thov nyob rau hauv cov khoom tseem ceeb marine, offshore platform splash zone cladding, desalination cog evaporator seem, thiab naval nkoj hulls qhov siab tshaj plaws durability.
Cov qib tshwj xeeb xws li C72200 (85-15 Cu-Ni) muaj cov khoom nruab nrab, thaum hloov cov hlau nrog chromium ntxiv muab kev tiv thaiv zoo rau qee qhov chaw corrosive. Kev xaiv ntawm cov qhab nia suav nrog kev ua tib zoo xav txog cov dej hiav txwv chemistry (cov ntsiab lus chloride, cov pa phem), kev ua haujlwm kub, ntws nrawm, thiab kev tsim lub neej xav tau.
2: Dab tsi yog qhov tseem ceeb ntawm kev tsim, vuam, thiab kev tsim cov nyom tshwj xeeb rau cov hlau npib tsib xee, thiab lawv tau hais li cas hauv kev ua lag luam?
Fabricating tooj liab npib tsib xee daim hlau nthuav tawm cov kev cov nyom sib txawv uas yuav tsum tau muaj cov txheej txheem tshwj xeeb:
Kev Ua Haujlwm: Cov tooj liab npib tsib xee muaj qhov txias txias zoo heev - ua cov yam ntxwv tab sis yuav tsum tau ua tib zoo tuav vim lawv lub zog qis dua piv rau cov hlau. Thaum lub sij hawm khoov thiab dov, qhov tsawg kawg nkaus khoov radii yuav tsum yog 2-3 zaug ntawm lub phaj tuab kom tiv thaiv kev tawg. Cov khoom siv siab ductility tuaj yeem ua rau lub caij nplooj ntoo hlav, yuav tsum tau khoov dhau los ntawm kwv yees li 3-5 degrees. Kev sib sau kub feem ntau zam dhau 600℃los tiv thaiv qhov kub luv thiab kev loj hlob ntawm cov nplej, txawm tias kev ntxhov siab ntawm 500-550℃qee zaum ua haujlwm tom qab ua haujlwm txias heev.
Welding Considerations: Vuam tooj liab nickel xav tau cov txheej txheem nruj:
Ua ntej- kev ntxuav yog qhov tseem ceeb kom tshem tawm cov oxides saum npoo uas siv cov txhuam hniav tsis muaj hlau tshwj xeeb rau cov tooj liab alloys.
Preheating rau 50-100℃pab tiv thaiv porosity thiab ua kom zoo fusion
Filler hlau xaiv yuav tsum sib phim lossis me ntsis zuag qhia tag nrho cov khoom siv hauv paus (ERCuNi rau C70600, ERCuNi-7 rau C71500)
Tiv thaiv cov roj uas yuav tsum tau thov argon lossis argon-helium sib tov nrog kev tswj cov pa oxygen nruj (<20 ppm)
Interpass kub yuav tsum tau khaws cia qis dua 150℃kom tiv thaiv kev loj hlob ntawm cov nplej ntau dhau
Tom qab-Kev kho Weld: Tag nrho cov qauv welded yuav tsum tau muab tshuaj annealing ntawm 900-1000℃F ua raws li sai sai quenching kom rov qab corrosion kuj nyob rau hauv cov tshav kub-tshem tawm tsam. Qhov kev kho no dissolves precipitated theem uas tuaj yeem tsim galvanic hlwb hauv kev pabcuam.
Kev tiv thaiv nto: Thaum lub sij hawm tsim, tooj liab npib tsib xee daim hlau yuav tsum raug tiv thaiv los ntawm kev sib kis los ntawm cov ntaub ntawv ferrous los tiv thaiv cov hlau impregnation, uas tuaj yeem pib ua haujlwm hauv zos.
3: Yuav ua li cas corrosion mechanism ntawm tooj liab npib tsib xee daim hlau txawv nyob rau hauv ntau yam marine ib puag ncig, thiab dab tsi tsim kev txiav txim siab optimize lawv lub neej kev pab cuam?
Tooj npib tsib xee tus txheej txheem tiv thaiv corrosion yog nyob ntawm kev ua kom nyias nyias, ua raws, thiab tus kheej- kho oxide txheej feem ntau yog tsim los ntawm cuprous oxide (Cu₂O) nrog cov nickel thiab hlau oxides. Qhov kev tiv thaiv txheej ruaj khov no txiav txim siab kev ua tau zoo nyob rau hauv ib puag ncig marine sib txawv:
Cov Dej Hiav Txwv Huv Huv: Hauv dej hiav txwv oxygenated ntawm qhov kub nruab nrab (qis dua 30 degree), tooj liab nickel daim hlau tsim cov yeeb yaj kiab tiv thaiv ruaj khov hauv 60-90 hnub. Tsim kev khiav ceev yuav tsum tau khaws cia nruab nrab ntawm 1-3.5 m / s kom ntseeg tau tias cov yeeb yaj kiab ruaj khov yam tsis muaj kev yaig. Hauv qab 0.6 m / s, sedimentation thiab under-deposit corrosion yuav tshwm sim; siab tshaj 4.5 m / s, erosion-corrosion ua qhov tseem ceeb.
Cov dej qias neeg thiab nyob ruaj khov: Hauv cov chaw nres nkoj lossis qhov chaw kaw nrog cov kab mob sulfide, cov yeeb yaj kiab tiv thaiv tuaj yeem tawg mus rau tooj liab sulfide, ua rau muaj kev txhim kho corrosion ntau. Cov tswv yim tsim muaj xws li nce kev tiv thaiv corrosion (feem ntau 2-3 hli), cathodic tiv thaiv systems, los yog cov txheej tiv thaiv nyob rau hauv qhov chaw ruaj khov.
Daim Ntawv Thov Txias Cheeb Tsam: Lub voj voog ntub dej - qhuav qhuav hauv thaj chaw txaws xav tau kev saib xyuas tshwj xeeb. Rau offshore platforms, tooj liab nickel daim hlau feem ntau yog siv los ua cladding tshaj steel substrates. Tus tsim yuav tsum ua kom tiav cov hluav taws xob sib cais ntawm cov khoom siv thiab koom nrog kev tiv thaiv cathodic txaus rau cov hlau substrate.
Galvanic Compatibility: Thaum tooj liab nickel daim hlau txuas mus rau lwm cov ntaub ntawv, kev rwb thaiv tsev kom zoo lossis cathodic tiv thaiv yuav tsum tau ua. Hauv cov tshuab hlau sib xyaw, tooj liab npib tsib xee feem ntau ua raws li cathode txheeb ze rau hlau tab sis raws li cov anode txheeb ze rau titanium lossis siab - alloy stainless hlau.
Biofouling Resistance: Tooj npib tsib xee qhov kev tiv thaiv rau kev loj hlob hauv hiav txwv txo cov nqi kho tab sis yuav tsum muaj qhov tsawg kawg nkaus khiav ntawm 0.6-1.0 m / s los tiv thaiv kev sib haum xeeb. Nyob rau hauv cov xwm txheej zoo li qub, cov tshuaj chlorination tsis tu ncua lossis kev tu txhua yam yuav tsim nyog.
4: Dab tsi tsis yog -kev kuaj kev puas tsuaj (NDT) cov txheej txheem thiab cov qauv kev tswj xyuas zoo yog qhov tseem ceeb rau kev ua kom muaj kev ncaj ncees ntawm tooj liab nickel phaj kev teeb tsa hauv cov ntawv thov tseem ceeb?
Ua kom muaj kev ncaj ncees ntawm tooj liab nickel phaj kev teeb tsa yuav tsum tau ua tiav NDT thiab cov txheej txheem tswj kom zoo:
Cov ntaub ntawv pov thawj thiab Traceability: Txhua lub phaj yuav tsum tau ua nrog Daim Ntawv Pov Thawj Mill Test ua raws li ASTM B171 lossis cov qauv sib npaug, muab cov tshuaj ua kom tiav, cov khoom siv kho tshuab, thiab cov ntaub ntawv kho cua sov. Kev txheeb xyuas tas mus li thiab cov khoom siv taug qab los ntawm txhua theem kev tsim khoom yog qhov yuav tsum tau ua rau cov ntawv thov tseem ceeb.
Ultrasonic Testing (UT): Tag nrho -plate ultrasonic scanning yog ua los xyuas cov laminations, inclusions, los yog internal defects. Rau clad daim hlau, UT txheeb xyuas cov ntawv cog lus ncaj ncees nrog kev saib xyuas tshwj xeeb rau qhov zoo ntawm kev sib txuas. Automated UT systems nrog cov ntaub ntawv kaw lus muaj peev xwm yog tus qauv rau kev txheeb xyuas qhov tseeb thiab qhov tsis zoo.
Eddy Current Testing: Txoj kev no ua tau zoo pom qhov chaw thiab nyob ze - qhov chaw tsis xws luag, tshwj xeeb tshaj yog tseem ceeb rau cov phaj destined rau nyias- cov ntawv siv phab ntsa zoo li cov khoom siv hluav taws xob sib hloov. Ntau-frequency eddy testing tam sim no tuaj yeem paub qhov txawv ntawm qhov tsis xws luag thiab qhov tsis zoo ntawm qhov chaw.
Dye Penetrant thiab Sib Nqus Particle Testing: Thaum lub sij hawm dye penetrant tshuaj xyuas yog tus qauv rau kev kuaj xyuas qhov tsis xws luag, kev ntsuam xyuas cov hlau nplaum feem ntau tsis muaj feem xyuam vim cov khoom tsis yog -magnetic xwm. Rau cov qauv sib xyaw nrog cov thaub qab steel, MT yog siv xaiv rau cov khoom siv ferritic.
Kev kuaj corrosion: Accelerated corrosion tests, suav nrog ASTM G48 Method A rau pitting kuj thiab ntev -kev kuaj dej hiav txwv raug, yog ua los ntawm cov qauv tsim. Kev ntsuam xyuas electrochemical zoo li cyclic polarization muab cov ntaub ntawv ntawm kev muaj peev xwm rov ua dua.
Dimensional thiab Metallurgical Controls: nruj me ntsis qhov kam rau ua ib qho ASTM specifications raug txheeb xyuas, nrog rau kev kuaj xyuas microstructural kom paub meej qhov loj me (feem ntau ASTM 5-7) thiab tsis muaj cov theem tsis zoo. Kev ntsuam xyuas hardness pom zoo kom zoo annealing thiab txias ua hauj lwm qib.
Welding Procedure Qualification: Txhua tus txheej txheem weld yuav raug kuaj xyuas kom zoo, suav nrog kev kuaj xyuas macro thiab micro, khoov cov kev ntsuam xyuas, thiab kev kuaj corrosion ntawm vuam daim coupon kom ntseeg tau tias HAZ cov khoom sib tw ua haujlwm hlau.
5: Dab tsi yog qhov kev txiav txim siab ntawm lub neej thiab cov yam ntxwv ntawm kev ruaj ntseg uas cuam tshuam rau kev xaiv ntawm cov tooj liab nickel daim hlau hla lwm cov ntaub ntawv hauv kev tsim kho marine?
Kev xaiv ntawm tooj liab npib tsib xee daim hlau suav nrog kev txheeb xyuas lub voj voog lub neej kom ntsuas tus nqi pib tiv thaiv kev ua haujlwm ntev -:
Tus nqi pib vs. Lub neej expectancy: Thaum tooj liab nickel daim hlau muaj cov nqi pib dua piv rau cov hlau coated lossis qee cov hlau tsis muaj steel (kwv yees li 2-3 zaug siab dua ib tuj), lawv lub neej kev pab feem ntau tshaj 25-30 xyoo hauv seawater daim ntaub ntawv, piv rau 8-15 xyoo rau ntau lwm txoj kev. Qhov kev ncua sij hawm ntev no feem ntau ua pov thawj qhov kev nqis peev thawj zaug los ntawm kev txo cov nqi hloov pauv thiab kev saib xyuas lub sijhawm.
Kev Kho thiab Kev Ua Haujlwm Tus Nqi: Tooj npib tsib xee qhov kev txhim kho corrosion thiab biofouling inhibition txo qis kev saib xyuas. Kev kwv yees kev txuag nqi txij li 40-70% piv rau cov tshuab hlau uas xav tau cov txheej txheem tu thiab tswj kev tiv thaiv cathodic. Qhov txo qis ntawm qhov qhuav-docking rau cov nkoj hauv hiav txwv sawv cev rau kev txuag nyiaj ntau.
Kev xav txog kev ua haujlwm zoo: Hauv kev siv cov khoom siv hluav taws xob, tooj liab nickel cov thermal conductivity zoo heev (kwv yees 29 W / m·K rau C70600) tswj kev tsim hluav taws xob hloov hluav taws xob thoob plaws hauv lub neej. Lwm cov ntaub ntawv uas muaj qis conductivity los yog prone rau fouling yuav tsum tau loj deg cheeb tsam kom ua tau raws li qhov sib npaug, nce system loj thiab nqi.
Recyclability thiab Environmental Impact: Copper nickel alloys muaj qhov tshwj xeeb rov ua dua tshiab, nrog kwv yees li 80-90% ntawm qhov kawg- ntawm lub neej cov khoom feem ntau rov qab los thiab rov siv dua hauv cov khoom tshiab. Lub zog tsim khoom siv rau cov khoom siv tooj liab nickel tsuas yog kwv yees li 15% ntawm qhov xav tau rau kev tsim khoom thawj zaug, txo qis cov pa roj carbon hneev taw.
Environmental Compliance: Copper nickel's natural biofouling resistance txo los yog tshem tawm qhov xav tau rau cov tshuaj tua kab mob tshuaj lom neeg uas muaj tooj liab oxides lossis organotins, txhawb kev ua raws li cov kev cai ib puag ncig nruj ntxiv xws li International Maritime Organization's antifouling system convention.
Tag Nrho Tus Nqi Ntawm Cov Tswv Cuab Kev Ntsuam Xyuas: Cov TCO suav nrog rau cov txheej txheem dej hiav txwv sab nrauv qhia pom tooj liab npib tsib xee phaj kev teeb tsa ua tiav cov nqi sib xws nrog lwm txoj hauv kev hauv 7-10 xyoo, nrog cov nyiaj khaws cia ntau tshaj 25- xyoo kev pab cuam lub neej. Kev suav suav suav nrog cov nqi khoom, fabrication, installation, txij nkawm, downtime, zog efficiency, thiab kawg-ntawm-lub neej rov qab tus nqi.
Risk Mitigation Value: Qhov kev kwv yees tau ntev, ntev - kev ua tau zoo ntawm tooj liab nickel txo cov kev pheej hmoo ua haujlwm cuam tshuam nrog kev ua haujlwm tsis zoo ntawm kev npaj txhij txog corrosion, uas hauv cov tshuab tseem ceeb tuaj yeem ua rau poob ntau tshaj $ 1 lab toj ib hnub hauv kev ua haujlwm sab nrauv.
Cov Lus Qhia Tseem Ceeb thiab Cov Qauv:
ASTM B171: Tus qauv Specification rau tooj liab-Alloy Phaj thiab Sheet rau Pressure Vessels, Condensers, thiab Heat Exchangers
NORSOK M-001: Kev xaiv cov ntaub ntawv
DNVGL-RP-0416: Corrosion Protection of Floating Productions thiab Storage Units
TS EN ISO 15156-3: Kev lag luam roj av thiab roj ntuj - Cov khoom siv rau H₂S-muaj ib puag ncig
ASME Boiler thiab Pressure Vessel Code, Tshooj II, Ntu B
