Titanium tuaj yeem ua alloyed nrog txhuas, vanadium, hlau, thiab molybdenum los tsim muaj zog, hnav alloys. Titanium alloy muaj qhov zoo ntawm qhov ceev, muaj lub zog zoo, zoo corrosion, thiab yog ib qho kev ua tau zoo, thiab yog qhov zoo tagnrho aerospace engineering cov khoom siv. Hauv qhov chaw tsim khoom tiag tiag, ntau hom kev xeb yuav tshwm sim, feem ntau hauv cov pawg hauv qab no:
1. Crevice corrosion
Nyob rau hauv qhov khoob lossis qhov tsis xws ntawm cov khoom siv hlau, kev xeb hauv zos yog tshwm sim los ntawm stagnation ntawm electrolytes los ua ib qho hluav taws xob hluav taws xob. Hauv cov kev daws teeb meem nruab nrab thiab acidic, qhov tshwm sim ntawm kev sib cuag corrosion hauv titanium alloy qhov khoob yog ntau dua li hauv cov kev daws teeb meem alkaline, thiab kev sib cuag corrosion tsis tshwm sim. Nyob rau hauv tag nrho qhov sib txawv nto, tab sis thaum kawg, ua rau ib nrab perforation tsis ua hauj lwm.
2. Pitting tshwm sim
Titanium tsis muaj pitting corrosion tshwm sim nyob rau hauv feem ntau cov ntsev tov. Nws feem ntau tshwm sim hauv cov kev daws teeb meem uas tsis yog aqueous thiab boiling high-concentration chloride daws. Cov halogen ions nyob rau hauv cov tshuaj corrode lub passive zaj duab xis nyob rau saum npoo ntawm titanium thiab diffuse mus rau hauv titanium ua rau pitting corrosion, lub pitting qhov taub yog tsawg tshaj li nws qhov tob. Qee cov organic media kuj tseem yuav tau pit corrosion nrog titanium alloys hauv halogen daws. Pitting corrosion ntawm titanium alloys nyob rau hauv cov kev daws teeb meem halogen feem ntau tshwm sim nyob rau hauv high-concentration thiab high-temperature ib puag ncig. Tsis tas li ntawd, pitting corrosion nyob rau hauv sulfides thiab chlorides yuav tsum muaj tej yam kev mob uas txwv.
3. Hydrogen embrittlement
Hydrogen embrittlement (HE), tseem hu ua hydrogen-induced cracking los yog hydrogen puas, yog ib qho ntawm cov ua rau kev puas tsuaj thaum ntxov thiab tsis ua hauj lwm ntawm titanium alloys. Cov zaj duab xis passive nyob rau saum npoo ntawm titanium thiab nws cov titanium alloys muaj lub zog siab, thiab qhov rhiab heev ntawm hydrogen embrittlement nce nrog kev nce ntawm lub zog. nce, yog li cov zaj duab xis passivation yog rhiab heev rau hydrogen embrittlement.
4. Tiv tauj corrosion
Lub passive oxide zaj duab xis ntawm titanium nto txhawb lub peev xwm ntawm titanium kom txav mus rau qhov muaj peev xwm zoo, uas txhim kho cov kua qaub tiv thaiv ntawm cov ntaub ntawv titanium thiab corrosion ntawm dej xov xwm. Vim tias muaj peev xwm ntau dua ntawm titanium alloy nto, nws raug khi ua rau kev sib cuag corrosion los ntawm kev tsim cov hluav taws xob hluav taws xob nrog lwm cov hlau hauv kev sib cuag nrog nws. Titanium alloys nquag hu rau corrosion nyob rau hauv ob hom xov xwm hauv qab no: thawj yog kais dej, ntsev tov, seawater, cua, HNO3, acetic acid, thiab lwm yam. Qhov ruaj khov electrode muaj peev xwm ntawm Cd, Zn, thiab Al hauv cov tshuaj no yog Tsis zoo tshaj Ti, thiab tus nqi anodic corrosion nce 6 mus rau 60 npaug. Hom thib ob yog H2SO4, HCl, thiab lwm yam. Hauv cov kev daws teeb meem no, Ti yuav nyob rau hauv lub xeev passivation lossis lub xeev qhib. Thawj qhov kev daws teeb meem corrosion yog ntau heev hauv cov txheej txheem kev sib cuag corrosion. Feem ntau, kev kho mob anodizing yog siv los tsim cov txheej txheem hloov kho ntawm lub substrate los tiv thaiv kev tiv thaiv corrosion.
