Koj puas xaiv titanium lossis stainless hlau rau chav ua noj?

Titanium yog cov hlau uas muaj lub cev zoo thiab tshuaj lom neeg, nrog qhov ceev ntawm 4.5g / cm³, melting point txog 1668 degree, linear expansion coefficient ntawm 8.4 × 10 ⁻⁶ / degree ntawm 20 degree, thiab thermal conductivity ntawm 16.329W / (m·k). Qhov tseem ceeb tshwj xeeb yog tias titanium thiab titanium alloys muaj qhov zoo tshaj plaws corrosion kuj, thiab lawv cov corrosion kuj tseem zoo dua li stainless hlau hauv oxidizing, nruab nrab, thiab chloride uas muaj xov xwm.

Ntshiab titanium zoo nkaus li nyiaj dawb hlau nyob rau hauv tsos, nrog lub cev nruab nrab cubic qauv saum toj no 882 degree, hu ua titanium; Thaum qhov kub thiab txias qis dua qhov no, nws yog cov qauv hexagonal nrog cov txheej txheem ntom ntom, hu ua alpha titanium. Qhov kub ntawm titanium lub isomorphic transformation txawv nyob ntawm seb cov ntsiab lus alloy thiab impurity cov ntsiab lus. Tsis tas li ntawd, titanium muaj kev sib raug zoo rau cov pa oxygen thiab tuaj yeem ua kom ruaj khov thiab ntom ntom oxide zaj duab xis txawm nyob rau hauv chav tsev kub. Cov txheej ntawm zaj duab xis no muab titanium zoo heev corrosion kuj. Txawm li cas los xij, txawm hais tias cov pa yaj thiab nitrogen hauv titanium tuaj yeem txhim kho lub zog ntawm cov khoom, nws tuaj yeem txo nws cov plasticity. Ntawm qhov tod tes, hydrogen tuaj yeem ua rau embrittlement ntawm titanium thiab titanium alloys. Hauv cov ntawv thov kev lag luam, kev lag luam ntshiab titanium tau siv dav hauv kev lag luam tshuaj vim nws cov yas zoo heev, corrosion kuj, weldability, thiab yooj yim ntawm kev tsim. Txawm li cas los xij, hauv kev siv tswv yim, cov yam ntxwv ntawm corrosive media feem ntau txiav txim siab los ntawm ntau yam sib txawv, nrog rau cov khoom siv tshuaj thiab lawv cov concentrations, atmospheric tej yam kev mob, kub, thiab lub sij hawm. Yog li ntawd, xaiv cov khoom tsim nyog yam tsis paub qhov tseeb ntawm cov khoom nruab nrab yog ib txoj haujlwm nyuaj. Txhawm rau pab xaiv cov khoom siv, cov hauv qab no yog qee cov lus qhia ua haujlwm: Hom 304 yog cov khoom siv dav siv uas tuaj yeem tiv taus kev xeb hauv kev tsim kho thiab tiv thaiv kev yaig ntawm cov khoom noj khoom noj khoom haus (tab sis qhov kub ntawm qhov chaw uas muaj cov kua qaub thiab chlorides tuaj yeem ua rau corrosion). Nws tuaj yeem tiv taus cov organic tebchaw, dyes, thiab ntau yam inorganic compounds. 304L hom (tsawg-carbon) muaj kev tiv thaiv zoo rau nitric acid thiab tuaj yeem tiv taus qhov kub thiab txias thiab concentration ntawm sulfuric acid. Nws yog dav siv nyob rau hauv cov kua roj tso tsheb hlau luam thiab cov khoom siv kub qis, nrog rau lwm cov khoom siv xws li cov khoom siv hauv chav ua noj thiab cov khoom siv hauv tsev kho mob. 316 hom muaj ntau npib tsib xee thiab 2-3% molybdenum dua li 304 hom, yog li nws muaj kev tiv thaiv corrosion zoo dua, tshwj xeeb tshaj yog nyob rau hauv chloride media uas yuav ua rau pitting corrosion. Hom 316 tau siv rau hauv cov tshuab sulfite pulp vim tias nws tuaj yeem zam cov sulfuric acid tebchaw thiab nws siv tau txuas ntxiv mus rau kev lag luam ua haujlwm rau kev tuav ntau yam khoom siv tshuaj.

Hom 317 muaj 3% -4% molybdenum (qhov siab tshaj plaws hauv koob) thiab ntau chromium dua li 316 hom, yog li muaj kev tiv thaiv siab dua rau pitting thiab crevice corrosion. 430 hom alloy muaj cov ntsiab lus qis dua li 304 hom alloy thiab yog siv rau kev kho kom zoo nkauj polishing hauv cov cua sov. Nws kuj tseem siv tau rau nitric acid thiab khoom noj khoom haus. Hom 410 muaj cov ntsiab lus qis tshaj plaws ntawm peb feem ntau siv titanium daim hlau thiab tsim nyog rau cov khoom siv thauj khoom hnyav uas yuav tsum muaj kev sib xyaw ua ke ntawm lub zog thiab kev tiv thaiv corrosion, xws li cov khoom siv. Hom 410 muaj qhov zoo tiv thaiv corrosion hauv huab cua sov, dej vapor, thiab ntau yam tshuaj lom neeg. Hom 2205 zoo dua rau 304 thiab 316 hom vim tias nws muaj kev tiv thaiv siab rau chloride kev nyuaj siab corrosion tawg. Cov ntaub ntawv saum toj no tsuas yog siv rau kev siv xwb. Hauv kev siv cov tswv yim, cov khoom siv titanium thiab titanium alloy zoo tshaj plaws yuav tsum raug xaiv raws li kev ua haujlwm tshwj xeeb.