Hauv Titanium Immersion Rhaub rau 20% Sodium Persulfate Solution ntawm 50 degree, Vim li cas Persulfate Ion Ua rau Siab Tshaj Corrosion Rate (0.2 hli / xyoo) dua li qhov sib npaug ntawm Hydrogen Peroxide (0.05 hli / xyoo) Txawm tias ob leeg muaj zog Oxidizers?

Tus nqi corrosion ntawm Qib 2 titanium hauv 20% sodium persulfate ntawm 50℃yog 0.15-0.30 hli / xyoo. Ntawm qhov kub thiab txias, qhov corrosion ntawm 20% hydrogen peroxide yog 0.03-0.08 hli / xyoo. Tus nqi siab dua nrog persulfate vim tias nws muaj peev xwm txo qis dua (2.01 V) dua li H2O2 (1.78 V). Lub peev xwm siab dua thawb lub titanium ntxiv mus rau hauv cheeb tsam transpassive qhov twg cov zaj duab xis passive dissolves ntawm tus nqi nrawm dua. Tsis tas li ntawd persulfate degradation cov khoom (sulfate radicals) muaj zog tshaj li hydroxyl radicals los ntawm H2O2.

Mechanism ntawm Persulfate Aggressiveness

S₂O₈²⁻ + 2e⁻ → 2SO₄²⁻ (E degree=2.01} V) Persulfate txo. Kev txo qis ntawm hydrogen peroxide: E degree=1.78 V H2O2 + 2H + + 2e- → 2H2O Lub peev xwm sib xyaw ntawm titanium hauv persulfate yog 1.6-1.8 V thiab hauv H2O2 nws yog 1.3-1.5 V. Lub transpassive dissolutionally loj hlob tam sim no. Tus nqi corrosion (persulfate / H2O2) yog 3-6 × .

Quantitative Sib piv ntawm Corrosion Rate

Oxidizer Concentration % Kub Degree Corrosion Rate mm/xyoo
H 2 O 2 20 50 0.03-0.08
Na₂S₂O₈ 5 50 0.10-0.20
Na2S2O8 10 50 0.15-0.25
Na 2 S 2 O 8 20 50 0.20-0.35 Phau Ntawv Qhia Xaiv Khoom

Persulfate Concentration (%) Pom zoo Cov Khoom Xav Tau Corrosion Rate (mm / xyoo)
<5 Grade 7 titanium 0.05-0.10 5-10 PTFE-coated titanium <0.01 >10 Tantalum 0.01
Detailing nrog qhov tseeb ntawm tes

Zam tsis txhob coated titanium rau persulfate daws saum 5% concentration. Siv titanium lossis tantalum nrog PTFE txheej. Paub txog lub zog oxidizer ntau dua, tus engineer xaiv cov khoom tsim nyog.