Anodizing kev txhim kho cov corrosion tsis kam ntawm cov hlau sib tsoo?

Kev siv tshuab thiab cov hau kev ntawm anodizing kom txhim kho cov npoo hlau sab corrosion

Anodizing yog cov txheej txheem kev kho kom zoo nkauj uas ua rau cov yeeb yaj kiab oxide ntawm cov hlau saum toj ntawm cov txheej txheem electrochemical. Nws yog qhov tshwj xeeb tsim rau kev ua hluav taws xob xws li txhuas, magnesium, Titanium, thiab lawv cov alloys. Cov txheej txheem no tuaj yeem txhim kho cov khoom lag luam corrosion tsis kam ntawm cov ntaub ntawv hlau, txuas ntxiv lawv cov kev pabcuam, thiab txhim kho lawv cov tsos thiab cov neeg kho mob. Kab lus no yuav tham txog kev nthuav dav txhim kho cov kab hlau, suav nrog nws cov qauv, thiab cov yam ntxwv ntawm ntau hom sib txawv ntawm anodizing.

I. Cov hauv paus ntsiab cai thiab cov qauv xeb tiv taus kev siv tshuab ntawm anodizing

Anodizing cov txheej txheem yeej tseem ceeb cuam tshuam nrog kev siv hluav taws xob sab nraud, siv cov hlau ua haujlwm ntawm cov khoom siv oxident oxidation rau saum npoo av, sib sau ua yeeb yaj kiab. Qhov yeeb yaj kiab oxide no tau sib raug zoo rau lub hauv paus hlau thiab muaj cov qauv thiab kev ua tau zoo uas txawv ntawm cov neeg pleev cov yeeb yaj kiab ntawm cov nog oxide.

Tus oxide zaj duab xis txheej txheem ua tau cov txheej txheem tuaj yeem faib ua peb theem: ua ntej, cov hlau nto zom ua ib txheej ntxig; Tom qab ntawd, cov yeeb yaj kiab oxide pib loj hlob ntsug; Thiab thaum kawg, txheej oxide nrog ib tug qauv huab tais tshwj xeeb yog tsim. Cov yeeb yaj kiab oxide yog tuab dua (li microns), Denser, thiab muaj cov yeeb yaj kiab ntau tshaj ib txwm muaj tshwm sim oxide cov yeeb yaj kiab.

Cov tub ntxhais tseem ceeb ua los ntawm uas anodic oxide zaj duab xis txhim khu kev txhim kho corrosion yog:

1. Lub cev muaj lub cev: Oxide zaj duab xis ua raws li lub cev lub cev, tiv thaiv kev tawm tsam corrosive (oxygen, thiab chloride ions) los ntawm kev sib cuag ncaj qha nrog lub hauv paus hlau.

2.

3. Tus kheej {-} kho lub peev xwm los hloov cov pa oxygen, ua tiav qib ntawm "tus kheej- kho."

4. Pore seading nyhuv: Cov ntaub ntawv kho tom qab txuas ntxiv tuaj yeem thaiv cov microscores hauv cov yeeb yaj kiab oxide, ua rau muaj peev xwm txo qhov peev xwm rau kev nkag los ntawm corrosive media.

Ii. Cov txheej txheem tseem ceeb cuam tshuam rau kev corrosion tsis kam ntawm Anodic oxide zaj duab xis

Ob peb qhov kev txwv nyob rau hauv cov txheej txheem anodizing ncaj qha cuam tshuam rau qhov zoo thiab corrosion tsis kam ntawm cov yeeb yaj kiab oxide kawg thiab yuav tsum tau kho kom meej:

1. Electrolyte muaj pes tsawg leeg

Cov khoom sib txawv sib txawv tsim tawm oxide cov yeeb yaj kiab nrog cov qauv sib txawv:

{{0-}}} sulfuric acid anodizing: ua rau cov yeeb yaj kiab oxide 5-25μm tuab, nrog zoo corrosion tsis kam thiab tus nqi qis.

- chromic acid anodizing: ua yeeb yaj kiab oxide

-} xalic acid anodizing: ua rau cov yeeb yaj kiab oxide oxide (txog 50μm), nrog siab tawv thiab zoo heev corrosion.

- phosphoric acid anodizing: feem ntau yog siv los txhim kho cov txheej nplaum, tab sis nrog cov tshuaj tiv thaiv corrosion tsawg.

Qhov kub thiab txias thiab kub thiab txias, thiab cov ntxiv ntxiv cuam tshuam cov khoom ntawm cov yeeb yaj kiab oxide. Feem ntau hais lus, qis dua qhov kub (10-20 degree) nyiam kev tsim cov duab denser oxide.

2. Volfage thiab tam sim no ceev

Voltage thiab qhov ceev tam sim no txiav txim siab txoj kev loj hlob thiab cov qauv ntawm cov yeeb yaj kiab oxide:

{{0-} Tshaj heev voltage yuav ua rau cov yeeb yaj kiab oxide kom tawg, ua kev tsis haum.

-}} qhov ceev no yuav ua rau cov yeeb yaj kiab oxide xoob xoob thiab ntxeem tau.

- Kev ntsuas hluav taws xob tsis tu ncua lossis ntu tam sim no feem ntau yog siv, nrog cov tsis tsim nyog xaiv raws li hom khoom.

3. Oxidation Sijhawm

Oxidation lub sijhawm ncaj qha cuam tshuam cov yeeb yaj kiab tuab:

{{0- Luv luv lub sijhawm ua rau muaj cov ntawv qhia tuab thiab cov nyhuv tiv thaiv tsis zoo.

{{0-} ntev dhau ib lub sijhawm yuav nce zaj duab xis ntxhov siab thiab ua rau tawg.

{{0 {0} Kuv yuav tsum khaws lub sijhawm ntawm 20 thiab 60 feeb.

4. Kev ntsuas kub

Electrolyte kub yog qhov tseem ceeb parameter:

{{0-} Tsawg Kub (10-20 degree) nyiam kev tsim ntawm cov yeeb yaj kiab oxide.

- High temperatures (>25 degree) tshwm sim nyob rau hauv ib xoob thiab ntxig oxide zaj duab xis.

{{0- Lub kaw lus txias yog qhov yuav tsum muaj los tswj qhov kub tas li.

III. Post -} Cov txheej txheem kho mob txhim kho kev txhim kho corrosion

Cov yeeb yaj kiab anodic yooj yim tseem muaj qee yam ntawm porosity. Tsim Nyog Tshaj Tawm - Kev kho mob tuaj yeem txhim khu kev txhim kho corrosion ntxiv:

1. Pore sealing

Pore ​​ntim yog cov kauj ruam tseem ceeb hauv kev txhim kho cov corrosion tsis kam ntawm Anodic oxide zaj duab xis. Cov kev sib xws suav nrog:

- Kev kho dej kub: Kev kho dej kub hauv 90-130 tus lej tso cai rau hydrate, nthuav dav, thiab ntsaws cov hws.

- Chav Tsoo Sealing: Siab {{}}} Lub siab} Lub siab} Lub Siab Kev Kho Mob yog qhov ua tau zoo rau kev ua dej kub.

{{0-}}}}} Kev kho tshuab txias: kev daws nrog kev daws teeb meem hlau xws li Nickel thiab cobalt yog ib puag ncig ua phooj ywg thiab ua haujlwm zoo.

{{0 {}} Nruab nruab nrab: Kev kho kom haum rau kev daws nrog kev daws teeb meem organic tshuaj ntxiv ntawm 60-80 degree.

2. Dyeing thiab Coloring

Thaum lawv lub hom phiaj tseem ceeb yog qhov ua kom zoo nkauj, qee qhov tuag (xws li inorganic dyes) kuj tseem tuaj yeem muab ntxiv kev tiv thaiv corrosion:

{{0-} electrolytic xim: txhim kho kev tiv thaiv los ntawm kev tso cov hlau ions hauv pores.

{{0- organic organic dyes: qee qhov zas molecules tuaj yeem ntsaws cov nplai.

3. Composite Txheej Txheem

Sib txuas anodizing nrog lwm txoj kev kho nyob rau saum npoo:

-} anodizing + organic txheej (piv txwv li, polytetrafluoroethylene): soonergistic tiv thaiv

{{0- anodizing + sol -} gel txheej: nanoscale kev tiv thaiv

- anodizing + vapor deposition: Ultra-} kev tiv thaiv siab

IV. Corrosion kuj cov yam ntxwv ntawm ntau hom ntawm anodizing

1. Pa anodizing (ntaus II)

Siv cov sulfuric acid electrolyte, cov yeeb yaj kiab tuab yog 5-25μm, nrog nruab nrab porosity. Tom qab kev khi, nws ua rau pom kev zoo heev corrosion thiab yog haum rau ib puag ncig muaj kev lag luam.

2. Hard anodizing (ntaus III)

Siv cov qes - kub sulfuric acid los yog ntau dua, muaj ntau dua, nrog rau kev ua haujlwm corrosion thiab corrosion tsis kam, thiab haum rau kev ua haujlwm hnyav.

3. Micro - arc oxidation (ntshav elecolation (ntshav electrolytic oxidation)

Micro - arc expced yog tsim nyob rau hauv lub voltage siab, sib sau ib txheej oxide uas muaj cov theem sib cav. Qhov no muab cov kev tiv thaiv corrosion zoo tshaj plaws thiab yog tsim tshwj xeeb rau cov tshuaj tiv thaiv me xws li magnesium.

V. Txoj Kev Ntsuam Xyuas rau Anodic Corrosion Kuj

Cov hau kev rau kev soj ntsuam lub corrosion tsis kam ntawm Anodic oxide zaj duab xis muaj xws li:

-} Cov tshuaj tsuag (piv txwv li, Astm B117): Kev ntsuas kev xeb tawm hauv cov ntsev tshuaj ib puag ncig

{-} Electrochemical Testing: Kev ntsuas kev ntsuas xws li kev tiv thaiv polarization tsis kam

{{0- porosity kuaj: ntsuas qhov ntom ntom ntawm oxide zaj duab xis

{{0- Kev sim kub: Simulates kev ua haujlwm hauv siab {{1} {{{{}} noo noo ib puag ncig

- tiag} tiag me ntsis kuaj: ntev-}} sij hawm sab nraum zoov kev soj ntsuam

VI. Cov ntawv thov thiab cov kev txwv

Anodizing thev naus laus zis rau kev txhim kho corrosion tsis kam yog siv dav hauv:

- kes vajtse vajtse txhuas profiles (qhov rooj, qhov rai, ntaub thaiv phab ntsa)

-} auRospace Cheebtsam

{{0 {}} tej qhov chaw automotive

- tshuab hluav taws xob

-} marine engineering khoom

Txawm li cas los xij, anodizing thev naus laus zis kuj muaj qee qhov kev txwv:

-} tsis haum rau cov hlau uas muaj hlau xws li hlau

{{0- nyuaj hauv kev ua haujlwm ua haujlwm

{{0- nihide oxide cov yeeb yaj kiab yuav ua rau muaj kev hloov sab nraud

{{0- Corrosion tseem yuav tshwm sim hauv cov acident acidic thiab alkaline ib puag ncig.

VII. Kev tsim kho yav tom ntej

Txhawm rau txhim kho cov corrosion tsis kam ntawm Anodic oxide zaj duab xis, cov lus qhia yav tom ntej muaj xws li:

- nanocomposite sealing thev naus laus zis

{{0- kev loj hlob ntawm ib puag ncig cov phooj ywg zoo electrolytes

{{0 {}}} Cov txheej txheem ntse tswj cov txheej txheem

- Multifunctional Composite Kev Kho Tshuab

-}} Cov txheej txheem zoo rau cov alloys tshiab

Hauv cov ntsiab lus, anodic oxidation tuaj yeem txhim kho cov kab hlau tsis zoo ntawm cov duab hlau los ntawm kev sib sau ua yeeb yaj kiab, sib xyaw nrog cov txheej txheem tsim nyog. Nrog kev nce qib nruam ntawm cov txheej txheem thev naus laus zis, daim ntawv thov cov kev cia siab ntawm Anodic oxidation nyob rau hauv lub teb ntawm corrosion tiv thaiv yuav txawm dav dav.