Lub xub ntiag ntawm chloride ions nyob rau hauv stainless hlau siv ib puag ncig

Cov tshuaj chlorine ions muaj dav, xws li ntsev / hws / dej hiav txwv / hiav txwv cua / av, thiab lwm yam. Stainless hlau corrodes sai heev nyob rau hauv lub xub ntiag ntawm chloride ions, txawm surpassing zoo tib yam uas tsis muaj carbon steel. Yog li ntawd, muaj cov kev cai rau kev siv ib puag ncig ntawm stainless hlau, thiab nws yog ib qho tsim nyog yuav tsum tsis tu ncua so, tshem tawm plua plav, thiab tswj kom huv thiab qhuav. Muaj ib qho piv txwv hauv Tebchaws Meskas uas ib lub tuam txhab siv lub thawv ntoo qhib los tuav cov tshuaj uas muaj chloride ions, uas tau siv rau ze li ib puas xyoo. Nyob rau xyoo 1990, nws tau npaj yuav hloov, tab sis vim tsis muaj cov khoom siv ntoo qhib niaj hnub, lub thawv xau vim corrosion 16 hnub tom qab hloov nrog stainless hlau.
Yog tsis muaj kev daws teeb meem
Cov ntsiab lus alloy tsis yaj rau hauv lub matrix, ua rau cov ntsiab lus tsis tshua muaj hlau thiab tsis zoo corrosion kuj nyob rau hauv cov qauv matrix.
Ntuj intergranular corrosion
Cov khoom siv no tsis muaj titanium thiab niobium nyhav tuaj yeem ua rau muaj kev cuam tshuam intergranular. Ntxiv titanium thiab niobium, ua ke nrog kev kho kom ruaj khov, tuaj yeem txo cov kev cuam tshuam ntawm intergranular. Ib hom hlau alloy siab uas tuaj yeem tiv taus corrosion hauv huab cua lossis tshuaj corrosive media. Stainless hlau muaj ib tug zoo nkauj nto thiab zoo corrosion kuj, tsis tas yuav tsum tau kev kho deg xws li plating, thiab siv lub inherent nto ntawm stainless hlau. Nws yog feem ntau siv ntau hom hlau thiab hu ua stainless hlau. High alloy steels xws li 13 chromium steel thiab 18-8 chromium nickel steel sawv cev ua haujlwm. Los ntawm qhov kev xav ntawm Metallography, vim hais tias cov hlau tsis muaj chromium, ib daim ntawv nyias nyias ntawm chromium yog tsim rau saum npoo. Cov yeeb yaj kiab no tau sib cais los ntawm cov pa oxygen invading hauv cov hlau thiab ua lub luag haujlwm tiv thaiv corrosion. Yuav kom tswj tau qhov kev tiv thaiv corrosion ntawm cov hlau tsis huv, cov hlau yuav tsum muaj ntau tshaj 12 feem pua ​​​​chromium. Rau cov ntawv thov uas xav tau vuam, cov ntsiab lus qis qis txo qis cov nag lossis daus ntawm carbides hauv thaj chaw tshav kub cuam tshuam ze ntawm qhov vuam seam, uas yuav ua rau muaj kev cuam tshuam ntawm cov hlau stainless hauv qee qhov chaw.
hmoov av
Kev tsim khoom yog feem ntau nqa tawm hauv thaj chaw muaj plua plav, qhov chaw uas feem ntau muaj cov plua plav hauv huab cua uas pheej poob rau ntawm cov khoom siv. Lawv tuaj yeem raug tshem tawm nrog dej lossis alkaline daws. Txawm li cas los xij, adhering av yuav tsum muaj dej siab los yog chav ua kom huv.
Float hlau hmoov los yog embedded hlau
Ntawm txhua qhov chaw, cov hlau dawb yuav xeb thiab ua rau corrosion ntawm stainless hlau. Yog li ntawd, nws yuav tsum tau muab tshem tawm. Floating hmoov feem ntau yuav raug tshem tawm ua ke nrog hmoov av. Ib txhia muaj zog adhesion thiab yuav tsum tau kho nrog embedded hlau. Ntxiv nrog rau cov plua plav, muaj ntau qhov chaw ntawm cov hlau saum npoo, nrog rau kev ntxuav nrog cov pa roj carbon zoo tib yam hlau txhuam, tua peening nrog xuab zeb, iav hlaws, los yog lwm yam abrasives yav tas los siv rau cov pa roj carbon steel, tsis tshua muaj hlau alloy, los yog cam khwb cia hlau qhov chaw, los yog sib tsoo cov khoom uas tsis yog stainless hlau tau hais ua ntej ze ntawm stainless hlau Cheebtsam thiab khoom siv. Yog tias tsis muaj kev tiv thaiv kev tiv thaiv rau cov hlau tsis huv thaum lub sij hawm txiav los yog nqa cov txheej txheem, cov hlua hlau, cov cuab yeej nqa, thiab cov hlau ntawm lub rooj zaum ua haujlwm tau yooj yim embed lossis stains saum npoo. Cov kev xav tau ntawm kev txiav txim thiab kev soj ntsuam tom qab ntau lawm tuaj yeem tiv thaiv thiab xyuas kom muaj cov hlau tsis muaj hlau. ASTM tus qauv A380 [3] qhia txog txoj kev kuaj xeb rau kev tshuaj xyuas cov hlau lossis hlau nyob rau saum npoo ntawm stainless hlau. Thaum nws xav tau tias yuav tsum tsis muaj hlau tam sim no, txoj kev tshuaj xyuas no yuav tsum tau siv. Yog tias cov txiaj ntsig tau txaus siab, ntxuav lub ntsej muag nrog dej ntshiab lossis nitric acid kom txog thaum xim xiav tsaus ploj tag.