Nyob rau hauv siab -Tub kub chloride- muaj cov txheej txheem tshuaj, Titanium Cua sov Tube Alloy Cov Txheej Txheem Ua Li Cas Txhim Kho Kev Tiv Thaiv Pitting Corrosion thiab Degradation ntawm cov qauv?

Chloride ions tam sim no nyob rau hauv kub kub tshuaj ua tshuab feem ntau ua hauj lwm nyob rau hauv petrochemical manufacturing, industrial brine kho, seawater desalination pretreatment thiab tshwj xeeb tshuaj synthesis. Ntau cov khoom siv hlau yog qhov ua rau muaj kev cuam tshuam hauv zos hauv chloride tej yam kev mob ntawm qhov kub thiab txias.

titanium cua sov raj feem ntau yog xaiv vim muaj kev ua haujlwm siab rau kev xeb thiab kev ua haujlwm ruaj khov ntawm titanium hauv cov xwm txheej hnyav. Txawm li cas los xij, cov alloy muaj pes tsawg leeg yog qhov tseem ceeb rau kev txhim kho ntawm kev tiv thaiv pitting corrosion, crevice corrosion thiab mechanical degradation nyob rau hauv chloride raug.

Cov nyhuv ntawm alloying ntsiab ntawm corrosion kuj
Kev lag luam ntshiab titanium muaj kev tiv thaiv corrosion zoo heev vim qhov tsim ntawm ib txwm tshwm sim passive oxide txheej. Qhov kev ruaj ntseg ntawm cov oxide txheej no yog qhov tseem ceeb hauv qhov kub thiab txias uas muaj chloride.

Cov khoom xyaw me me alloying txhim khu kev ua haujlwm:

Passive oxide zaj duab xis ntxiv dag zog

Txhim kho resilience rau localized tawg

Boosting mechanical zog ntawm thermal stress

Cov qib titanium feem ntau rau kev siv cua sov yog Qib 1, Qib 2 thiab siab dua - alloys zog. Lub zog txhua yam thiab kev tiv thaiv corrosion yog cuam tshuam los ntawm kev hloov pauv ntawm cov pa oxygen, hlau thiab lwm cov ntsiab lus ntawm kab.

Kev kho ntawm cov alloy muaj pes tsawg leeg muab kev ruaj ntseg ntawm cov txheej txheem tiv thaiv oxide kuj tseem muaj zog chloride quab yuam.

Tsis kam Pitting Corrosion nyob rau hauv cov tshuaj chloride
Pitting corrosion yog ib qho kev puas tsuaj hauv zos ntawm passive oxide zaj duab xis uas nthuav tawm cov hlau hauv qab rau cov ions tsis zoo. Chloride ions nkag mus los ntawm cov ntsiab lus tsis muaj zog hauv oxide txheej thiab pib qhov me me corrosion.

Alloy muaj pes tsawg leeg cuam tshuam pitting tsis kam los ntawm:

Ua kom ceev ntawm oxide zaj duab xis

Txo impurity -induced tsis muaj zog qhov chaw

Ua kom cov txheej txheem rov ua dua tshiab ntawm cov txheej txheem passive

Titanium ntawm purity siab dua nrog kev tswj xyuas ntxiv ntawm cov ntsiab lus alloying feem ntau qhia tau hais tias muaj zog tiv thaiv pitting los ntawm chlorides. Kev ruaj khov oxide ntau lawm txo qis qhov tshwm sim ntawm qhov pib pib thiab ua rau qeeb qeeb ntawm kev nthuav tawm.

Alloy zoo nyob rau hauv high temperature chloride systems yog ib qho tseem ceeb kom tsis txhob muaj kev sib tsoo hauv cheeb tsam.

Cov nyhuv ntawm Oxygen thiab Hlau ntawm Tensile Strength
Titanium alloys feem ntau muaj kev tswj cov pa oxygen thiab hlau kom muaj zog txhua yam. Ua kom muaj zog txhawb kev tiv thaiv deformation los ntawm:

Expansion kev nyuaj siab

Oscillations hauv dej siab

Mechanical vibration

Txawm li cas los xij, qib impurity siab dua tuaj yeem cuam tshuam corrosion kuj.

Engineers yuav tsum sib npaug:

3.1 Strengthening los ntawm alloying

Corrosion stability preservation

Cov txheej txheem kho kom zoo muaj qhov tsim nyog cov neeg kho tshuab robustness thiab tswj cov tshuaj sib raug zoo nrog chloride-nplua nuj tej yam kev mob.

Kev ua tau zoo ntawm qhov ntsuas kub siab
Qhov kub thiab txias muaj qhov ua kom muaj zog ntawm cov txheej txheem tshuaj hauv cov tshuab uas muaj chloride. Thaum kub siab dua:

Txhim khu kev tiv thaiv corrosion

Oxide zaj duab xis stability yuav raug txo

Thermal expansion ua rau muaj kev ntxhov siab ntau dua

Lub stability ntawm passive zaj duab xis ntawm titanium alloys nrog tsim nyog muaj pes tsawg leeg tswj txawm nyob rau hauv high kub tau raug pov thawj. Alloying tswj txhim khu kev tiv thaiv corrosion nyob rau hauv tshav kub cycling tej yam kev mob thiab ua kom muaj kev ncaj ncees nyob rau hauv lub sij hawm ntev ua hauj lwm mus.

Kev xaiv cov khoom siv tshwj xeeb yog qhov tseem ceeb rau cov tshuab khiav dhau 100 degree, qhov twg chlorides ua rau muaj kev txhoj puab heev.

Crevice Corrosion Resistance
Crevice corrosion tshwm sim feem ntau ntawm qhov sib txawv nruj heev, xws li cov ntsiab lus txuas, cov chaw sib khi lossis thaj chaw sib txuas ntawm cov titanium cua sov raj thiab cov qauv kev txhawb nqa.

Cov alloy muaj pes tsawg leeg ua rau muaj kev tiv thaiv rau crevice corrosion los ntawm:

Txhim kho cov txheej txheem passive hauv thaj chaw tsis muaj oxygen

Txhim kho electrochemical stability nyob rau hauv ib puag ncig txwv

Cov titanium alloys zoo dua tuaj yeem tiv taus qhov kev puas tsuaj hauv cheeb tsam txawm tias muaj cov pa oxygen tsawg. Qhov no yog ib qho tseem ceeb rau cov khoom siv cua sov uas tso rau hauv cov khoom siv tshuaj tuab tuab lossis cov tso tsheb hlau luam nruj.

Kev sib cuam tshuam ntawm Alloy Composition thiab Surface Condition
Cov alloy muaj pes tsawg leeg dictates lub intrinsic corrosion kuj, whereas lub nto tej yam kev mob cuam tshuam rau lub sij hawm ntev - kev ua tau zoo.

Ruaj khov alloy thiab raug nto tiav:

Nce adherence ntawm oxide zaj duab xis

Minimizes nto imperfections

Micro- txo qhov pib tawg

Kev txhim kho saum npoo zoo tiv thaiv chloride ions los ntawm kev nkag mus rau qhov chaw tsis muaj zog ntawm cov qauv thiab txhim kho cov yam ntxwv tiv thaiv ntawm cov hlau.

Txhua yam - dhau durability yog kev sib xyaw ntawm cov khoom muaj pes tsawg leeg thiab kev tsim vaj tsev nto.

Feem ntau Titanium Alloy Qib rau Chloride Ib puag ncig
Cov qib titanium feem ntau yog xaiv rau cov ntawv thov kev lag luam raws li qhov yuav tsum tau muaj zog thiab tshuaj lom neeg hnyav.

Titanium Qib Alloy Properties pom zoo siv
Qib 1 Siab purity, siab corrosion kuj heev hnyav chloride ib puag ncig
Qib 2 Zoo zog thiab corrosion kujStandard chemical systems
Qib 7 (Pd- txhim kho) Kev tiv thaiv siab dua tiv thaiv kev txo cov acids hnyav corrosive ib puag ncig
Qib 12Higher zog nrog nruab nrab corrosion kujHigh mechanical load systems
Kev xaiv nyob ntawm qhov kub thiab txias, chloride concentration thiab qib ntawm cov neeg kho tshuab kev nyuaj siab.

Lub sij hawm ntev kev ntseeg siab thiab cov qauv kev ntseeg siab
Cov tshuaj chloride tsis tu ncua uas muaj cov txheej txheem ua haujlwm nrog cov kav dej cua sov ua haujlwm ntev lub sijhawm nyob rau hauv qhov raug tshuaj lom neeg tsis tu ncua.

Optimized hlau muaj pes tsawg leeg txhim kho kev cia siab los ntawm:

Txo qhov txaus ntshai ntawm corrosion hauv zos

Txo cov txheej txheem deterioration

Ntev - lub sij hawm txhua yam muaj zog

Txo qhov kev npaj tsis tiav

Qhov kev ntseeg siab no yog qhov tseem ceeb heev rau cov nroj tsuag kev lag luam uas poob ntawm cov zis tuaj yeem ua rau muaj kev poob qis hauv lub sijhawm poob.

Kev sib koom tes nrog lub zog ntom ntom thiab tuab ntawm phab ntsa
Alloy muaj pes tsawg leeg tsis yog ib yam uas muaj nyob rau hauv kev sib cais. Nws yuav tsum tau txiav txim siab ua ke nrog:

Phab ntsa thickness

Lub zog ceev

Dej ceev

Txoj hauj lwm ntawm installation

Txawm hais tias cov hlau uas muaj zog ntau dua tuaj yeem ua rau muaj kev ntxhov siab ntau dua, kev siv zog ntau dhau tuaj yeem txhim kho corrosion yog tias qhov kub thiab txias yog siab heev.

Lub kaw lus tau tsim kom muaj kev sib npaug xws li kev ua haujlwm ntawm cov alloy yog maximized yam tsis tau ua txhaum qhov kev nyab xeeb thermal txwv.

Xaus.
Lub titanium cua sov tube alloy muaj pes tsawg leeg yog qhov tseem ceeb hauv kev txhim kho kev tiv thaiv pitting corrosion thiab cov txheej txheem degradation hauv kub chloride uas muaj cov tshuaj ua haujlwm. Tswjhwm alloying ua rau kom muaj kev ruaj ntseg ntawm cov zaj duab xis passive, lub zog txhua yam thiab lub sijhawm ntev - chemical durability.

Txawm li cas los xij, nrog kev siv cov qib titanium kom zoo thiab sib cuam tshuam cov kev khiav hauj lwm kub thiab cov tshuaj chloride concentration, cov neeg ua haujlwm tuaj yeem ua tiav kev ua tau zoo nyob rau hauv cov xwm txheej nyuaj. Optimized cov ntaub ntawv muaj pes tsawg leeg thaum kawg tso cai rau cov cua sov ua haujlwm tsis tu ncua thiab lub neej ua haujlwm ntev ntawm kev xav tau kev lag luam.