Rau Titanium Heat Qws siv los ua kom sov A 5% Sodium Chlorite Solution ntawm 70 degree, Vim li cas Cov Chlorite Ion Decompose On Kub Titanium los ua chloride thiab Chlorate, Thiab Qhov no Yuav Hloov Li Cas Hauv Zos Electrolyte Chemistry?
Tso lus
Ntawm 70 degree, chlorite (ClO₂⁻) decomposes catalytically ntawm titanium nto: 4ClO₂⁻ → 3ClO₃⁻ + Cl⁻. Cov tshuaj tiv thaiv no tsim cov tshuaj chloride ions thiab chlorate ions. Cov tshuaj chloride accumulates nyob ze ntawm qhov chaw titanium, tsim kom muaj cov tshuaj chloride siab hauv zos (5-10 × bulk). High chloride concentration destabilizes titanium passive zaj duab xis, txhawb pitting. Cov chlorate ions tsis tshua muaj kev txhoj puab heev tab sis tuaj yeem decompose ntxiv ntawm qhov kub siab dua.
Quantitative Decomposition thiab Chloride Accumulation
Hauv 5% NaClO₂ ntawm 70℃rau 500 teev:
| Sijhawm (hli) | Chloride tsim tawm (ppm) | Local Cl⁻ (nto, ppm) | Chlorate tsim (ppm) | Corrosion Rate (mm / xyoo) |
|---|---|---|---|---|
| 0 | 0 | 0 | 0 | 0.01–0.03 |
| 100 | 50–100 | 500–1,000 | 200–400 | 0.03–0.08 |
| 250 | 150–250 | 1,500–2,500 | 600–1,000 | 0.08–0.15 |
| 500 | 300–500 | 3,000–5,000 | 1,200–2,000 | 0.15–0.30 |
| 1,000 | 500–800 | 5,000–8,000 | 2,000–3,200 | 0.25–0.50 |
Cov nyhuv ntawm qhov kub thiab txias ntawm tus nqi decomposition
| Kub (degree) | ClO₂⁻ Tus nqi decomposition (g / m²·teev) | Lub sij hawm mus rau 1,000 ppm Hauv Zos Cl⁻ (teev) |
|---|---|---|
| 50 | 0.2–0.5 | 200–500 |
| 60 | 0.5–1.0 | 100–200 |
| 70 | 1.0–2.0 | 50–100 |
| 80 | 2.0–4.0 | 25–50 |
Chlorite Decomposition Control Guide
| Ua haujlwm kub (degree) | Qhov Kev Pom Zoo Tshaj Plaws Tshaj Plaws (teev) | Kev Cia Siab Hauv Zos Cl⁻ Tom Qab Tshaj Tawm (ppm) |
|---|---|---|
| 50 | 1,000 | 500–1,000 |
| 60 | 500 | 500–1,000 |
| 70 | 200 | 500–1,000 |
| 80 | 100 | 500–1,000 |
Kev pom zoo engineering
Rau kev pabcuam sodium chlorite ntawm 70 degree, txwv kev ua haujlwm tas mus li 200 teev ua ntej ntxuav lossis hloov tshuaj. Siv Qib 7 titanium, uas muaj cov tshuaj chloride siab dua. Los ntawm kev tswj lub sij hawm raug, tus engineer txwv chloride tsub zuj zuj thiab pitting.
