Lub luag haujlwm txiav txim siab ntawm chromium hauv 316 stainless hlau daim hlau:

Lub luag haujlwm txiav txim siab ntawm chromium hauv 316 stainless hlau daim hlau:

Muaj tsuas yog ib lub ntsiab lus uas txiav txim siab cov khoom ntawm 316 stainless hlau daim hlau, uas yog chromium, thiab txhua hom stainless hlau phaj muaj qee qhov chromium. Txog tam sim no, tsis muaj stainless hlau tsis muaj chromium. Qhov laj thawj tseem ceeb vim li cas chromium dhau los ua lub hauv paus tseem ceeb los txiav txim siab qhov kev ua tau zoo ntawm cov hlau tsis muaj steel yog tias ntxiv chromium ua cov hlau alloying rau cov hlau txhawb kev sib cuam tshuam sab hauv los tsim kom muaj kev tiv thaiv corrosion. Qhov kev hloov no tuaj yeem piav qhia los ntawm cov hauv qab no:

1. Chromium tsub kom cov electrode muaj peev xwm ntawm hlau-raws li cov khoom daws teeb meem.

2. Chromium absorbs electrons los ntawm hlau kom passivate nws.

Passivation yog qhov tshwm sim uas qhov kev tiv thaiv corrosion ntawm cov hlau thiab cov hlau yog txhim kho vim qhov inhibition ntawm cov tshuaj tiv thaiv anodic. Muaj ntau ntau txoj kev xav uas ua rau kev ua haujlwm ntawm cov hlau thiab cov hlau, feem ntau suav nrog kev xav ntawm zaj duab xis nyias, adsorption theory, thiab electron arrangement theory.

Lub dual ntawm carbon nyob rau hauv 316 stainless hlau daim hlau

Cov pa roj carbon monoxide yog ib qho tseem ceeb hauv kev lag luam hlau, thiab cov khoom thiab cov qauv ntawm cov hlau tau txiav txim siab loj los ntawm cov ntsiab lus thiab kev faib tawm ntawm cov pa roj carbon hauv cov hlau, nrog cov pa roj carbon monoxide muaj qhov cuam tshuam tshwj xeeb hauv stainless hlau. Kev cuam tshuam ntawm cov pa roj carbon ntawm cov qauv ntawm cov hlau tsis muaj steel feem ntau yog tshwm sim hauv ob yam. Ntawm qhov tod tes, cov pa roj carbon monoxide yog cov khoom ruaj khov rau austenite thiab muaj cov nyhuv tseem ceeb (li 30 npaug ntawm npib tsib xee). Ntawm qhov tod tes, vim muaj kev sib raug zoo ntawm cov pa roj carbon thiab chromium, ntau cov carbides complex yog tsim nrog chromium. Yog li, los ntawm kev xav ntawm lub zog thiab corrosion kuj, lub luag hauj lwm ntawm carbon nyob rau hauv stainless hlau yog contradictory.

Los ntawm kev nkag siab tus qauv ntawm qhov kev cuam tshuam no, peb tuaj yeem xaiv cov hlau tsis muaj steel nrog cov ntsiab lus sib txawv raws li kev siv sib txawv.

Zuag qhia tag nrho, cov ntsiab lus carbon ntawm stainless hlau tam sim no siv nyob rau hauv kev lag luam yog tsawg, nrog rau feem ntau stainless hlau muaj cov ntsiab lus carbon ntawm {{0}}.1% thiab 0.4%, thaum acid resistant steels muaj cov ntsiab lus carbon feem ntau ntawm 0.1% thiab 0.2%. Stainless hlau nrog cov ntsiab lus carbon ntau dua 0.4% tsuas yog tso nyiaj rau ib feem me me ntawm tag nrho cov qib steel, vim tias nyob rau hauv feem ntau cov kev siv, stainless hlau ib txwm ua qhov tseem ceeb ntawm kev tiv thaiv corrosion. Tsis tas li ntawd, cov ntsiab lus qis qis kuj yog vim qee cov txheej txheem, xws li kev yooj yim ntawm vuam thiab txias deformation.

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