Titanium alloys, muaj li ntawm titanium raws li lub hauv paus hlau nrog rau lwm cov ntsiab lus, muaj ntau yam zoo xws li tsis tshua muaj ceev, siab zog-rau-hnyav piv, zoo heev corrosion kuj, thiab cov khoom ua tau zoo. Cov cwj pwm no ua rau titanium alloys yog qhov kev xaiv zoo tshaj plaws rau cov khoom siv hauv aerospace. Hauv qhov chaw tsim khoom tiag tiag, ntau hom kev xeb tuaj yeem tshwm sim hauv titanium alloys, txhua tus nrog nws cov ntaub ntawv sib txawv thiab cov txheej txheem hauv qab. Kab lus no muab cov ntsiab lus dav dav ntawm cov ntaub ntawv corrosion thiab cov txheej txheem cuam tshuam nrog titanium alloys, qhia txog lawv qhov tseem ceeb thiab cuam tshuam.
Crevice Corrosion
Crevice corrosion tshwm sim nyob rau hauv lub crevices los yog tsis xws luag ntawm cov hlau Cheebtsam thaum ib tug electrolyte tsim ib tug stagnant microenvironment, ua rau lub zos corrosion. Nyob rau hauv nruab nrab thiab acidic daws, qhov tshwm sim ntawm kev sib cuag corrosion nyob rau hauv titanium alloy crevices yog ho siab tshaj nyob rau hauv alkaline daws. Txawm li cas los xij, kev sib cuag corrosion tsis cuam tshuam rau tag nrho qhov chaw crevice tab sis nws thiaj li ua rau lub zos perforation tsis ua hauj lwm.
Pitting Corrosion
Titanium nthuav tawm zoo heev rau pitting corrosion nyob rau hauv feem ntau cov ntsev tov. Txawm li cas los xij, pitting corrosion yog feem ntau tshwm sim nyob rau hauv cov kev daws teeb meem uas tsis yog aqueous thiab boiling concentrated chloride daws. Nyob rau hauv xws li ib puag ncig, halide ions tawm tsam cov zaj duab xis passive ntawm titanium nto, ua rau thaj chaw pitting nrog lub qhov taub me dua lawv qhov tob. Qee cov organic media kuj tuaj yeem ua rau pitting corrosion ntawm titanium alloys hauv halide daws. Pitting corrosion nyob rau hauv titanium alloys feem ntau tshwm sim nyob rau hauv high-concentration thiab high-temperature tej yam kev mob. Tsis tas li ntawd, tej yam kev mob tshwj xeeb thiab kev txwv yog tsim nyog rau pitting nyob rau hauv sulfide thiab chloride ib puag ncig.
Hydrogen embrittlement
Hydrogen embrittlement (HE), tseem hu ua hydrogen-induced cracking lossis hydrogen puas, yog ib qho ntawm cov txheej txheem ua tsis tiav thaum ntxov hauv titanium alloys. Lub passive oxide zaj duab xis nyob rau saum npoo ntawm titanium thiab nws cov hlau alloys muaj lub zog siab, thiab qhov cuam tshuam rau hydrogen embrittlement nce nrog lub zog nce. Yog li, hydrogen embrittlement ntawm passive zaj duab xis ntawm titanium alloys yog rhiab heev.
Galvanic corrosion kuj
Lub passive oxide zaj duab xis nyob rau saum npoo ntawm titanium txhawb kev hloov pauv zoo hauv titanium electrode muaj peev xwm, txhim kho nws cov kua qaub thiab dej tsis kam. Txawm li cas los xij, lub peev xwm muaj peev xwm ntawm titanium alloys tuaj yeem tsim hluav taws xob hluav taws xob nrog lwm cov hlau hauv kev sib cuag, ua rau galvanic corrosion. Titanium alloys yog nquag galvanic corrosion nyob rau hauv ob hom kev tshaj tawm: thawj hom muaj xws li kais dej, ntsev tov, seawater, cua, nitric acid, acetic acid, thiab lwm yam., qhov chaw ruaj khov electrode muaj peev xwm ntawm Cd, Zn, thiab Al yog ntau dua. tsis zoo dua li Ti, ua rau muaj kev nce ntxiv (6-60 zaug) hauv tus nqi ntawm anodic corrosion. Hom thib ob suav nrog H2SO4, HCl, thiab lwm yam, qhov twg Ti tuaj yeem nyob hauv lub xeev passivated lossis qhib lub xeev. Txawm li cas los xij, feem ntau pom galvanic corrosion thaum sib cuag feem ntau tshwm sim hauv thawj hom corrosive media. Kev kho anodizing feem ntau yog ua haujlwm los tsim cov txheej txheem hloov kho ntawm lub substrate nto, inhibiting galvanic corrosion.
Nkag siab txog ntau hom kev xeb thiab lawv cov txheej txheem hauv titanium alloys yog qhov tseem ceeb heev rau kev tsim cov khoom siv tiv thaiv corrosion thiab cov qauv. Crevice corrosion, pitting corrosion, hydrogen embrittlement, thiab galvanic corrosion yog cov ntaub ntawv tseem ceeb corrosion uas tuaj yeem cuam tshuam qhov kev ua tau zoo thiab kev ncaj ncees ntawm titanium alloys hauv ntau qhov chaw.
