Taw qhia
Seawater sawv cev rau ib qho kev xav tau tshaj plaws rau cov hlau fasteners. Cov ntsev ions, noo noo, kub hloov pauv, thiab marine biofouling ua ke ua rau pitting, crevice corrosion, thiab galvanic corrosion. Ntau tus kws tshaj lij kev muag khoom tsuas yog xaiv rau cov hlau tsis muaj steel bolts, tsuas yog nrhiav cov qhov pitting tshwm rau lub hlis tom qab kev teeb tsa. Kev xaiv cov khoom siv ntsia liaj qhov rooj tsis raug tuaj yeem ua rau muaj kev saib xyuas tsis zoo, kev pheej hmoo ntawm kev nyab xeeb, thiab cov nqi hloov pauv siab. Phau ntawv qhia no pab cov engineers thiab pab pawg neeg yuav khoom hauv kev xaiv cov dej hiav txwv uas tsim nyog - tiv thaiv bolts raws li qhov tseeb ntawm ntug dej hiav txwv kev ua haujlwm, es tsis yog tso siab rau cov ntaub ntawv tshaj tawm.
1. Nkag siab txog hom corrosion tseem ceeb hauv dej hiav txwv
Ua ntej xaiv cov ntaub ntawv, koj yuav tsum paub qhov twg corrosion yuav ua rau koj bolts puas.
Pitting corrosion: Hauv zos qhov me me ntawm cov hlau nto, feem ntau rau cov hlau tsis huv hauv dej ntsev. Nws tuaj yeem tshwm sim txawm tias qhov dav dav zoo li zoo.
Crevice corrosion: tshwm sim nyob rau hauv nqaim qhov sib txawv ntawm bolt, txiv ntseej, ntxhua khaub ncaws thiab lub hauv paus hlau. Cov tshuaj ntsev nyob hauv qhov khoob ua kom muaj kev xeb sai dua qhov chaw qhib.
Galvanic corrosion: Thaum ob lub hlau sib txawv kov hauv cov dej hiav txwv conductive, cov hlau tsis zoo yuav corrode sai. Kev sib xyaw carbon steel bolt nrog stainless hlau puag phaj yog qhov yuam kev.
Kev ntxhov siab corrosion cracking: Muab qhov nro tas li thiab ntsev ib puag ncig. Bolts nyob rau hauv siab preload yuav tawg dheev tsis pom tseeb nto xeb.
2. Cov khoom sib piv rau kev pabcuam dej hiav txwv
| Khoom siv | Pros | Kev txwv | Tsim nyog Scene |
|---|---|---|---|
| 304 Stainless hlau | Tus nqi qis, khoom siv yooj yim, zoo rau cov av noo me ntsis | Tsis zoo pitting tsis kam, tsis pom zoo rau kev txuas mus rau seawater immersion | Lub ntug hiav txwv huab cua, txaws cheeb tsam nkaus xwb, tsis muaj submersion ncaj qha |
| 316 / 316L Stainless hlau | Molybdenum ntxiv, zoo dua los tiv thaiv -pitting kev ua tau zoo dua 304 | Tseem muaj kev pheej hmoo ntawm crevice corrosion nyob rau hauv cov dej hiav txwv stagnant; tsis ntev immersion | Coastal txaws cheeb tsam, qee zaus dej hiav txwv tshuaj tsuag, dock auxiliary qauv |
| Duplex Stainless hlau (2205) | Lub zog siab, zoo heev pitting & crevice kuj, zoo kev ntxhov siab corrosion kuj | Tus nqi siab dua, kev ua haujlwm nyuaj dua | Offshore platform, seawater yeeb nkab, submerged khoom |
| Super Duplex (2507) | Sab saum toj tiv thaiv-corrosion ntawm stainless hlau qib, siab mechanical zog | Tus nqi siab, txwv tsis pub | Dej hiav txwv sib sib zog nqus, mus tas li submerged lug, siab chloride ib puag ncig |
| Alloy C276 / Hastelloy | Tawm tsam muaj zog chloride thiab acid sib tov | kim heev, siv rau huab cua corrosive | Chemical marine pipeline, hnyav hnyav seawater |
| Kub-dip galvanized carbon steel | Kev xaiv nyiaj txiag tsawg | Zinc txheej hnav ceev ceev hauv dej hiav txwv tsis tu ncua; luv kev pab cuam lub neej | Cov qauv ntawm ntug hiav txwv ib ntus, luv - lub sijhawm project nkaus xwb |
3. Txoj kev kho deg thiab lawv cov kev txwv
Cov txheej txheem tuaj yeem txhim kho corrosion, tab sis nyob rau hauv cov dej hiav txwv hnyav,lub txheej tsis tuaj yeem hloov cov khoom siv hauv paus nws tus kheej.
PTFE txheej: Zoo tshuaj tiv thaiv, txo cov xov galling. Tab sis khawb thaum lub sij hawm installation yuav nthuav tawm lub hauv paus hlau thiab tsim cov ntsiab lus corrosion.
Dacromet: Ua haujlwm zoo rau cov chaw ntug hiav txwv. Thaum tag nrho rau hauv dej hiav txwv, kev pab cuam lub neej poob qis heev.
Electroless npib tsib xee plating: Zoo ntsev tsuag kev ua tau zoo dua zinc plating, tab sis tsis tsim los rau cov dej hiav txwv mus tas li.
Rau marine submerged daim ntaub ntawv, cia siab rau cov khoom siv alloy nws tus kheej es tsis yog txheej txheej. Txhua qhov khawb ntawm txheej yuav dhau los ua qhov pib corrosion.
4.Installation ceeb toom
-Ua tib yam hlau sib xws. Tsis txhob khi stainless hlau ntsia liaj qhov rooj nrog carbon steel qauv phaj, txwv tsis pub galvanic corrosion yuav tshwm sim. Yog tias hlau -*--- tsis tuaj yeem zam tsis tau, siv cov tshuab ntxhua khaub ncaws kom cais ob lub hlau.
-Tsis txhob nqaim qhov khoob. Txo cov dej ntws tawm ntawm cov ntsia hlau taub hau thiab cov khoom siv hauv paus. Siv lub tshuab ntxhua khaub ncaws loj yog qhov ua tau.
-Control zawm torque. Tshaj - zawm ua kom muaj kev ntxhov siab ntxiv thiab ua rau muaj kev ntxhov siab tawg. Ua raws li cov khoom pom zoo torque tus nqi.
-Xav txog qhov dej ntws. Cov dej hiav txwv stagnant yog corrosive ntau dua li cov dej hiav txwv ntws. Sediment thiab marine organism txuas ua kom cov crevice corrosion.
-Kev tiv thaiv kab mob. Stainless hlau threads yooj yim ntes thaum lub sij hawm zawm. Siv cov tshuaj tiv thaiv - txeeb cov khoom siv tshwj xeeb uas tsim los rau kev pabcuam hauv hiav txwv.
5. Yuav ua li cas txiav txim siab koj qib bolt sai
Hiav txwv cua / qee zaus ntsev tsuag, tsis muaj immersion: 316L stainless hlau
Splash zone, intermittent ntub dej hiav txwv: 316L lossis 2205 duplex, raws li qhov project lub neej
Cov dej hiav txwv mus tas li: 2205 / 2507 super duplex
Luv -lub sij hawm ib ntus kev tsim kho ntug dej hiav txwv: Kub dip galvanized carbon steel (tau txais luv lifespan)
Seawater ntxiv rau cov tshuaj lom neeg muaj kuab lom: Hastelloy C276
FAQ
Q1: Puas yog 304 stainless hlau bolts siv tau rau hauv dej hiav txwv?
A: Tsis pom zoo rau kev sib cuag ncaj qha lossis immersion. Nws tuaj yeem ua haujlwm nyob rau hauv ntug dej hiav txwv atmospheric ib puag ncig deb ntawm yoj txaws. Nruam ntsev tsuag yuav ua rau pitting corrosion nyob rau hauv ib lub sij hawm luv luv.
Q2: Puas yog 316L txaus rau underwater marine qauv?
A: 316L ua haujlwm zoo hauv thaj chaw txaws. Rau kev ruaj ntseg tag nrho submersion, crevice corrosion yuav nce, duplex stainless hlau yog nyiam rau ntev - tej yaam num.
Yog tias koj xav tau kev txhim kho corrosion-cov bolts tiv taus rau marine, wharf, lossis offshore platform cov haujlwm, thov xa cov ntsiab lus hais txog kev ua haujlwm, kev xav tau ua ntej, thiab txiav txim kom muaj nuj nqis rau peb pawg neeg tsim khoom. Peb tuaj yeem muab cov ntaub ntawv pov thawj, cov ntaub ntawv tshuaj xyuas, thiab cov kev cai tshwj xeeb rau cov khoom tsis yog -tus qauv.
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