Rau Titanium Tshav Kub Kub Ua Haujlwm hauv 50% Potassium Carbonate Solution ntawm 110 degree, Yuav Ua Li Cas Cov Qib Oxygen Dissolved (0.5 ppm vs . 5 ppm) Hloov qhov ruaj khov ntawm Titanate Passivation Txheej?

Nyob rau hauv 50% poov tshuaj carbonate (K2CO3) ntawm 110℃kev tiv thaiv txheej ntawm potassium titanate (K2TiO3) yog tsim rau ntawm titanium nto. Dissolved oxygen (DO) yog ib qho tseem ceeb ntawm titanates ntau lawm. Thaum qis DO (0.5 ppm) titanate txheej yog nyias (0.1-0.5 µm), ntxeem tau thiab muaj kev tiv thaiv tsis txaus. Thaum siab DO (5 ppm) txheej yog thicker (1-3 µm) thiab ntom txo corrosion tus nqi los ntawm 5-10 ×.

Quantitative Stability of Passivation Layer vs. Dissolved O2

50% K 2 CO 3 110℃1,000 h:

DO (ppm) Titanate Layer Thickness (µm) Corrosion Rate (mm/xyoo) Qhov Ntsuas Kub ntawm DO Requirement Surface Condition 0 (deaerated) 0.05-0.1 0.15-0.30 Tsaus, ntxeem tau 0.5 0.1-0.3 0.08-0.15 Grey, me me 2 0.5-1.0 0.03-0.08 Lub teeb grey 5 1.0-2.0 0.01-0.03 Ci ntsa iab, tiv thaiv 10 2.0-3.0 0.005-0.015 Ci ntsa iab

Kub (degree) Yam tsawg kawg nkaus DO rau Stable Passivation (ppm) Pom zoo DO (ppm) 80 1 3 100 2 5 110 3 6 120 4 8 Daim ntawv qhia kev tswj cov pa oxygen

DO (ppm) . Titanate Layer Stability .Recommended Action >5 Zoo Tsis Muaj 3-5Good Monitor txhua lub lim tiam 1-3 Marginal Sparge cua
0.5-1 Phem nce aeration<0.5 Unstable Redesign; add oxidiser
Tswv yim Engineering

50% K.sub.2CO.sub.3 at 110.degree. C. keep dissolved oxygen >5 ppm los ntawm huab cua sparging Tus kws tshaj lij kev tswj hwm ntawm DO txhawb nqa cov txheej txheem tiv thaiv potassium titanate.