Rau Qib 2 Titanium Heat Qws Siv los ua kom sov 10% Sodium Periodate Solution ntawm 60℃, Lub Periodate Ion (IO₄⁻) Yuav Ua Li Cas Hloov Qhov Qhib -Circuit Potential los ntawm +0.2}V rau +1.1V vs. Ag/AgCl thiab Ua Transpassive ntawm 5 hli?

IO4-/IO3- +1.6 V * Muaj zog oxidant Sodium periodate (NaIO4) 10% 60℃Lub peev xwm ntawm titanium nyob rau hauv qhib Circuit Court txawv ntawm +0.2 V (neutral chloride) mus rau +1.0-1.2 V. Qhov no muaj peev xwm nyob rau hauv lub transpassive cheeb tsam ntawm titanium qhov twg cov passive txheej yog tsis tu ncua {{2} O 8} {O2} 4+ + 4OH - + 2e -. Corrosion tus nqi yog 0.03-0.08 hli / xyoo uas yog siab tshaj nyob rau hauv ntau oxidizing acids tab sis tseem tsim nyog rau cov kev pab cuam.

Mechanism ntawm periodate induced transpassive dissolution

Periodate raug txo kom iodate: IO₄⁻ + 2H⁺ + 2e⁻ → IO₃⁻ + H₂O. Cov tshuaj tiv thaiv no muaj kev sib pauv siab tam sim no, kom lub peev xwm titanium tau teeb tsa tshaj 1.0 V. Ntawm qhov muaj peev xwm no, titanium nyob rau hauv cheeb tsam transpassive thiab oxide txheej dissolves uniformly. Tsis muaj pitting, nres yog khov kho.

Quantitative Corrosion Rate Versus Periodate Concentration

5% NaIO 4 thiab 60℃qhov corrosion yog 0.02-0.05 hli hauv ib xyoos. Ntawm 10% tus nqi yog 0.03-0.08 hli yr-1. Ntawm 20% tus nqi yog 0.05-0.12 mm / xyoo. Ntawm 10%, 80ºC tus nqi yog 0.06-0.15 hli / xyoo.

Daim Ntawv Qhia Kev Xaiv Cov Khoom Siv

Periodate Concentration (%) Kub (degree) Titanium Corrosion Rate (mm/xyoo) Pom zoo<5 60 <0.05Yes 5-10 60 0.03-0.08 Yes 10-20 60 0.05-0.12 Limited 10 80 0.06-0.15 No
Ua kom paub meej specification rau

Titanium rhaub hauv 10% NaIO4 ntawm 60℃yuav muaj qhov corrosion ntawm 0.03-0.08 hli / xyoo 25-50 xyoo lub neej. Siv phab ntsa 2.0 hli. Tus kws tshaj lij nkag siab txog qhov kev sib cais ntawm qhov transpassive txhawm rau xaiv cov phab ntsa tuab.