Yuav Ua Li Cas Cov Qauv Hluav Taws Xob Hluav Taws Xob (Tam sim no hloov pauv) Los ntawm Titanium Immersion Rhaub Hauv 3% NaCl Ntawm 80℃Hloov Raws Li Metastable Pits Hloov mus rau qhov chaw ruaj khov, thiab yuav siv li cas rau kev ceeb toom ntxov?
Tso lus
In 3% NaCl at 80°C, titanium exhibits characteristic electrochemical noise before pitting. Metastable pits produce short, low-amplitude current spikes (0.1–1 µA, duration 0.1–1 second). Stable pits produce larger, longer spikes (5–50 µA, duration >1 thib ob) nrog tus yam ntxwv nce ntug. Saib xyuas kev hloov pauv ntawm metastable mus rau lub suab nrov ruaj khov muab kev ceeb toom ntxov ntawm pitting, tso cai rau kev cuam tshuam ua ntej perforation.
Quantitative Noise yam ntxwv
Rau Qib 2 titanium hauv 3% NaCl ntawm 80 degree:
| Pit Hom | Tam sim no Spike Amplitude (µA) | Spike Duration (seconds) | Ntau zaus (spikes / teev) | Lub Sijhawm Ceeb Toom Ua Ntej Perforation |
|---|---|---|---|---|
| Metastable | 0.1–1 | 0.1–1 | 10–100 | >500 teev |
| Kev hloov pauv | 1–5 | 0.5–3 | 50–200 | 100-500 teev |
| Stable (thaum ntxov) | 5–20 | 1–10 | 20–100 | 50-200 hnub |
| Stable ( lig ) | 20–100 | 10–100 | 5–50 | <50 hours |
Suab nrov-Raws li Kev Ceeb Toom Thaum Ntxov System Guide
| Nthuav Suab nrov | Txhais lus | Pom zoo ua | Cia siab tias tseem tshuav txoj sia |
|---|---|---|---|
| Qee zaum metastable spikes | Ib txwm passivity | Tsis muaj | >1,000 teev |
| Nquag metastable spikes | Nce qhov pib pib | Nce kev tshuaj ntsuam xyuas | 500-1,000 teev |
| Kev hloov pauv hloov pauv (1-5 µA) | Thawj qhov chaw ruaj khov | Npaj tshuaj xyuas hauv 1 lub hlis | 200-500 teev |
| Stable spikes (5-20 µA) | Pits loj hlob | Tshawb xyuas hauv 1 lub lis piam | 100-200 teev |
| Large stable spikes (>20 µA) | Pitting hnyav | Hloov tam sim ntawd | <100 hours |
Kev pom zoo engineering
For critical titanium heaters in chloride service at 80°C, install an electrochemical noise monitoring system with a zero-resistance ammeter and reference electrode. Set an alarm at transition spike amplitude (>2 µA). Los ntawm kev txheeb xyuas cov qauv suab nrov, tus kws tshaj lij pom qhov kev hloov pauv ntawm metastable mus rau pitting ruaj khov thiab cuam tshuam ua ntej perforation.
