Rau Titanium Heat Qws 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 Kev Ruaj Ntseg Ntawm Titanate Passivation Txheej?
Tso lus
Nyob rau hauv 50% poov tshuaj carbonate (K₂CO₃) ntawm 110 degree, ib tug tiv thaiv poov tshuaj titanate (K₂TiO₃) txheej ntaub ntawv nyob rau hauv titanium nto. Dissolved oxygen (DO) yog qhov tseem ceeb rau kev tsim titanate. Thaum qis DO (0.5 ppm), titanate txheej yog nyias (0.1-0.5 µm) thiab ntxeem tau, muab kev tiv thaiv tsis zoo. Thaum siab DO (5 ppm), txheej yog thicker (1-3 µm) thiab ntom, txo corrosion tus nqi los ntawm 5-10 ×.
Quantitative Passivation Layer Stability vs. Dissolved Oxygen
Hauv 50% K₂CO₃ ntawm 110℃rau 1,000 teev:
| Qhov siab (ppm) | Titanate Txheej Thickness (µm) | Corrosion Rate (mm / xyoo) | Surface condition |
|---|---|---|---|
| 0 (ua tau) | 0.05–0.1 | 0.15–0.30 | Tsaus, ntxeem tau |
| 0.5 | 0.1–0.3 | 0.08–0.15 | Grey, nruab nrab |
| 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, ruaj khov |
Qhov cuam tshuam ntawm qhov kub thiab txias ntawm DO Requirement
| 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 |
Dissolved Oxygen Management Guide
| Kev ntsuas DO (ppm) | Titanate Txheej Stability | Pom zoo ua |
|---|---|---|
| >5 | Zoo heev | Tsis muaj |
| 3–5 | Zoo | Saib xyuas txhua lub lim tiam |
| 1–3 | Marginal | Huab cua |
| 0.5–1 | pluag | Nce aeration |
| <0.5 | Tsis ruaj khov | Kho dua tshiab; ntxiv oxidizer |
Kev pom zoo engineering
Rau 50% K₂CO₃ ntawm 110 degree, tswj cov pa oxygen siab tshaj 5 ppm los ntawm huab cua sparging. Los ntawm kev tswj DO, tus engineer txhawb kev ruaj khov, tiv thaiv cov poov tshuaj titanate txheej.
