Yuav ua li cas Electrochemical Noise Pattern (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?

Titanium shows a particular electrochemical noise in 3% NaCl at 80 °C prior to pitting. Metastable pits lead to brief current spikes of modest amplitude (0.1-1 µA) and length (0.1-1 sec). Stable pits create larger, longer spikes (5-50 mu A, duration >1 sec.) nrog tus yam ntxwv nce ntug. Saib qhov kev hloov pauv ntawm metastable mus rau lub suab nrov ruaj khov ua rau muaj kev ceeb toom ntxov ntawm pitting kom kho tau ua ntej nws perforates.

Quantitative suab nrov

Rau Qib 2 titanium hauv 3% NaCl ntawm 80ºC:

Perforation type Tam sim no spike amplitude (mA) Spike duration (seconds) Frequency (spikes/teev) Ceeb toom lub sij hawm ua ntej perforation
>500 teev 10-100 0.1-1 0.1-1 Metastable
Hloov pauv 1-5 0.5-3 50-200 100-500 teev
Nyob ruaj khov (thaum ntxov) 5-20 1-10 20-100 50-200 teev
Ruaj khov (lig) 20–100 10–100 5–50<50 hours
Phau Ntawv Qhia rau Suab nrov-Based Early Warning System

Ntsig Nroj Nroj Nroj Tsuag MeaningRecommended Action Life seeming
Intermittent metastable spikesNormal passivity None >1,000 h
Feem ntau metastable spikes Ntau qhov pib pib nce kev tshuaj xyuas 500-1,000 teev
Transition spikes (1–5 µA) Thawj qhov chaw ruaj khov Plan tshuaj xyuas hauv 1 lub hlis 200–500 teev
Stable spikes (5–20 µA) Loj hlob pitsInspect hauv 1 lub lis piam 100-200 teev
Large steady spikes (>20 µA) Pitting hnyav hloov tam sim ntawd <100 teev
Tswv yim Engineering

Install electrochemical noise monitoring system with zero resistance ammeter and reference electrode for important titanium heaters in chloride service at 80oC. Set alarm on transition spike amplitude (>2 ua). Ua ntej perforation, tus engineer txhais qhov kev hloov pauv ntawm metastable mus rau qhov ruaj khov pitting los ntawm kev txheeb xyuas cov qauv suab nrov.