Anodizing yog txheej txheem siv los tsim cov yeeb yaj kiab oxide aluminium ntawm cov txhuas txhuas lossis cov khoom txhuas aluminium. Nws suav nrog tso cov khoom txhuas lossis txhuas alloy li lub anode nyob rau hauv cov hluav taws xob hauv electrolyte thiab thov ib qho hluav taws xob tam sim no los ua cov yeeb yaj kiab txhuas oxide. Anodizing txhim kho cov corrosion tsis kam, hnav tsis kam, thiab zoo nkauj thaj chaw ntawm aluminium profiles. Thaum lub sij hawm anodizing txheej txheem ntawm txhuas profiles, ntau yam tsis xws luag pom tuaj yeem tshwm sim. Peb feem ntau nkag siab txog qhov ua rau pom kev tsis meej. Khoom siv kev xeb, tsis muaj da dej, nag lossis daus ntawm cov qib thib ob, lossis cov teebmeem galvanic muaj peev xwm ua rau pom txhua yam. Lawv tau piav raws li nram no:
1.acid lossis alkali etching
Ua ntej Anodizing, cov khoom siv txhuas yuav ua rau cov kua qaub los ntawm cov kua qaub los yog cov kua qaub lossis cov pa roj av dawb, ua rau hauv zos dawb rau saum npoo. Yog hais tias kev corrosion yog loj heev, cov pitting loj dua tuaj yeem tsim tau. Nws yog qhov nyuaj rau kev txiav txim siab nrog lub ntsej muag liab qab seb puas yog los ntawm cov kua xeb lossis alkali, tab sis nws tuaj yeem sib txawv ntawm thaj chaw corroded hauv qab lub tshuab tsom. Yog hais tias hauv qab ntawm lub qhov yog puag ncig thiab tsis muaj intergranular corrosion, nws yog tshwm sim los ntawm alkali etching. Yog tias hauv qab yog qhov tsis xwm yeem thiab nrog intergranular corrosion, nrog pits ntxaum, nws tshwm sim los ntawm acid etching. Tsis raug cai cia thiab tuav hauv lub Hoobkas kuj tseem tuaj yeem ua rau hom kev xeb no. Acid fumes los ntawm cov tshuaj polishing los ntawm cov tshuaj polishing lossis lwm cov tshuaj acidic, ntxiv rau chlorinated organaster organers, yog qhov chaw ntawm acid etching. Cov Alkali Etching yog tshwm sim los ntawm cov tawg thiab txaws ntawm cug, casent tshauv kua. Thaum qhov laj thawj pom tau txiav txim siab, ntxiv dag zog rau kev tswj hwm ntawm ntau cov txheej txheem hauv lub Hoobkas tuaj yeem daws cov teeb meem.
2.atmospheric corrosion
Aluminium profiles raug nthuav tawm cov cua noo tuaj yeem tsim kho kom dawb, uas feem ntau ua kom haum ntev raws li cov kab pwm. Lub cev atmospheric corrosion feem ntau tsis yog loj li kua qaub lossis alkali etching thiab tuaj yeem muab tshem tawm los ntawm cov txheej txheem tshuab lossis kev ntxuav tshuab. Atmospheric corrosion feem ntau tsis muaj ib cheeb tsam thiab nyhav kom tshwm sim rau qee qhov chaw uas qis dua cov dej khov kho lossis ntawm cov chaw sab saud. Thaum cov cheeb tsam corrosion yog qhov hnyav dua, hla ntu ntawm lub pitting zoo li inverted nceb. Hauv qhov no, kev ntxuav ua ke tsis tuaj yeem tshem tawm cov pitting thiab tej zaum tseem yuav ua rau lawv ntug dej. Yog hais tias atmospheric corrosion yog txiav txim siab, qhov chaw khaws cia hauv lub Hoobkas yuav tsum tau kuaj. Txhuas cov ntaub ntawv yuav tsum tsis txhob muab cia rau hauv cov cheeb tsam nrog cov kub ntau dhau los tiv thaiv dej vapor mas. Qhov chaw cia yuav tsum qhuav, thiab qhov kub yuav tsum tau ua kom zoo li muaj peev xwm.
3. cov khoom lag luam (cov dej)
Thaum daim ntawv lossis daim duab qhia yog muab tso rau ntawm cov ntaub ntawv txhuas lossis siv rau ntim, nws tiv thaiv kev puas tsuaj. Txawm li cas los xij, yog daim ntawv los ua kom ntub dej, corrosion me ntsis tshwm nyob rau saum npoo ntawm txhuas. Thaum corrugated cardboard yog siv, cov kab ib txwm muaj ntawm corrosion me ntsis tshwm sim ntawm cov ntsiab lus ntawm kev sib cuag nrog lub rooj sib tham corrugated. Txawm hais tias qee qhov tsis xws luag qee zaum tuaj yeem pom ncaj qha rau saum npoo av, lawv feem ntau tau tshaj tawm tom qab ntxuav cov alkaline thiab anodizing. Cov pob no feem ntau sib sib zog nqus thiab nyuaj rau tshem tawm los ntawm kev ntxuav tshuab txhais tau los yog kev ntxuav alkaline. Ntawv (board) corrosion yog tshwm sim los ntawm cov kua qaub ions, tsuas yog so42- thiab cl-, uas yog tam sim no hauv ntawv. Yog li ntawd, siv daim ntawv (board) tsis muaj Chlorides thiab sulfates thiab tsis txhob muaj kev nkag mus rau cov hau kev los tiv thaiv daim ntawv (board) corrosion.
4.Cov dej hauv kev corrosion (tseem hu ua Snowflake corrosion)
Tom qab kev ntxuav cov alkaline, tshuaj lom neeg polishing, lossis cov sulfuric acid pickling, yog tias rinsing dej muaj impurities, nws yuav ua rau lub hnub qub-puab lossis radiating me ntsis rau saum npoo. Lub Corrosion tob yog ntiav. Hom kev kho corros no tshwm sim thaum cov dej ntxuav kom hnyav rau cov khoom tsis huv lossis thaum tus nqi ntws ntawm kev yaug yaug yaug qhov tsawg. Nws zoo li snowflake-puab muaju nyob rau hauv tsos, li no lub npe "snowflake corrosion." Qhov ua rau yog cov tshuaj tiv thaiv nruab nrab ntawm kev tawm tsam ntawm zinc nyob rau hauv txhuas thiab yog li ntawd rau hauv dej huv. Yog tias cov rwb thaiv tsev hauv lub tank yog cov neeg pluag, galvanic cov teebmeem tuaj yeem ua exacerbate no yam tsis xws. Raws li cov ntaub ntawv txawv teb chaws, thaum cov ntsiab lus ntawm cov ntsiab lus ntawm aluminium alloy yog ntau dua 0.015%, cov cl- hauv cov dej huv yog siab dua 15 ppm, hom corrosion no yuav tshwm sim. Siv nitric acid rau pickling lossis ntxiv 0.1% hno3 rau kev ntxuav dej tuaj yeem tshem tawm nws.
5.Chloride corrosion
Lub xub ntiag ntawm cov tshuaj chloride me me hauv sulfuric acid anodizing da dej kuj tseem ua rau pitting corrosion. Cov yam ntxwv zoo yog sib sib zog nqus dub lub hnub qub zoo nkauj, uas muaj ntau lub ntsej muag lossis hauv lwm qhov chaw muaj zog tam sim no. Daim ntawv sau ua ke tsis muaj ib qho kev ua yeeb yaj kiab anodized, thiab cov tuab ntawm zaj duab xis hauv seem seem "ib txwm" qis dua li tus nqi xav tau. Cov ntsev siab cov ncauj lus hauv cov kais dej yog qhov tseem ceeb ntawm kev ua qias tuaj hauv da dej.
6.galvanic corrosion
Nyob rau hauv ib qho kev lom zem tank (anodizing lossis electrolytic xim), cov hluav taws xob hauv lub tank (cov hlau)
Edited los ntawm May Jiang los ntawm Mat Aluminium
Lub Sijhawm Post: Dec-15-2023
