Corrosion kuj ntawm titanium nyob rau hauv chlorine, bromine, iodine thiab fluorine thiab lawv cov tebchaw

Ntawm ntau yam ntaub ntawv hlau, titanium muaj kev tiv thaiv zoo hauv cov tshuaj chlorine ntub dej, tshuaj chloride (tshwj tsis yog kub thiab siab concentration ntawm ZnCl2, AlCls thiab CaCl2), chlorine-muaj cov tshuaj (xws li chlorate, chlorite, hypochlorite thiab perchlorate, thiab lwm yam) tov. , thiab tau ua tiav hauv cov nroj tsuag tshuaj dawb, cov nroj tsuag electrolytic chlorine thiab cov nroj tsuag kho dej khib nyiab. Txawm li cas los xij, titanium nyob rau hauv qhov kub thiab txias thiab siab concentration chloride tov yuav tshwm sim crevice corrosion, tshwj xeeb tshaj yog nyob rau hauv kev sib cuag nrog PTFE thiab lwm yam organic tebchaw, crevice corrosion yog heev hnyav.

Titanium nyob rau hauv cov roj chlorine qhuav ua rau muaj zog corrosion, thiab txawm ua rau hluav taws thiab spontaneous combustion. Cov tshuaj tiv thaiv ntawm Ti thiab Cl tsim TiCl4, uas yog cov tshuaj tiv thaiv exothermic. Cov tshuaj tiv thaiv ntawm Ti nrog Cl los ua TiCl4 yog cov tshuaj tiv thaiv exothermic. Ntev npaum li cov dej hauv nruab nrab qis heev, cov cua sov tso tawm tuaj yeem txhawb kev sib xyaw ntawm titanium kom txog thaum cov roj chlorine qhuav lossis titanium tag. Yog tias dej muaj nyob rau hauv cov roj chlorine, titanium tetrachloride dhau hydrolysis los ua cov titanium hydroxide dawb. Titanium hydroxide yog cov khoom ruaj khov, tsis zoo li titanium tetrachloride (uas muaj qhov kub ntawm 136 degree), uas yog cov kua dej tsis haum. Qhov ciam teb ntawm "qhuav" thiab "ntub" muaj feem xyuam nrog cov yam ntxwv xws li qhov kub thiab txias ntawm cov hlau alloy. Tshaj tawm, kev lag luam ntshiab titanium ntawm kwv yees li 200 degree hauv cov roj chlorine kom tswj tau lub xeev passive ntawm cov dej tsawg kawg nkaus li ntawm 1.5%; chav tsev kub, tsuav yog cov dej tsawg kawg nkaus kom tswj tau ntawm 0.3% ~ 0.4% saum toj no yuav tsis ntes hluav taws. Titanium-palladium alloys thiab titanium-nickel-molybdenum alloys tuaj yeem tswj tau qhov kev ua haujlwm ntawm cov hlau ntawm cov ntsiab lus dej qis dua.

Titanium qhov kev tiv thaiv corrosion rau bromine thiab iodine zoo ib yam li cov tshuaj chlorine, thiab ntev npaum li cov dej tau khaws cia, titanium tau lees tias yuav tsis xeb. Txawm li cas los xij, titanium yuav corrode nyob rau hauv fluorine, hydrofluoric acid los yog acid fluoride daws, txawm nyob rau hauv tsawg concentrations, thiab muaj zoo tsis muaj corrosion inhibitors, yog li titanium tsis pom zoo siv nyob rau hauv ib puag ncig raug fluorine atmospheres. Acid fluoride daws corrode titanium sai heev vim muaj hydrofluoric acid. Txawm li cas los xij, qee cov fluorides uas nyuaj nrog cov hlau ions, lossis cov fluorides ruaj khov (xws li fluorocarbons), feem ntau tsis corrode titanium.