Pou yon aparèy chofaj Titàn Immersion nan yon Solisyon 5% Sodyòm Persulfate nan 50 degre, Poukisa Ion Persulfate a pa pasiv Titanium Malgre li se yon Oksidan fò, epi olye de sa lakòz disolisyon Transpassive?

Na 2 S 2 O 8 ) is a greater oxidiser ( E o = 2.01 V for S 2 O 8 2 - / SO 4 2 - ) than nitric acid . However, on titanium persulfate induces transpassive dissolution, not stable passivation. At 50°C the high oxidation potential moves the titanium surface into the transpassive area (>1.8 V vs. SCE) kote fim pasif la kraze ak Titàn fonn kòm Ti4+ nan pousantaj 0.2-0.5 mm pa ane.

Pousantaj korozyon vs konsantrasyon persulfate (kantitatif)

500 èdtan nan 50 degre nan Na2S2O8:

Konsantrasyon Persulfate (%) Pousantaj Kowozyon (mm/ane) Sifas potansyèl (V vs. SCE) Mekanis 0 0.005–0.010 0.2–0.5Pasif 1 0.05-0.12 1.2-1.5 Melanje
3 0.12–0.25 1.5–1.7 Aparisyon transpasif
5 0.20–0.40 1.7–1.9 Transpasif 10 0.35–0.60 1.8–2.0Bò Efè Tanperati Transpasif sou Tranzisyon Transpasif

Tanperati (degre) 5% Persulfate – Pousantaj Kowozyon (mm/ane)Mekanis 25 0.10–0.20 Transpasif 40 0.15–0.30Transpasif 50 0.20–0.40Transpasif 60 0.30–0.60 Grav
Rekòmandasyon pou Jeni

Titàn pa sigjere pou solisyon persulfate akòz disolisyon transpasif. Sèvi ak aparèy chofaj PTFE kouvwi oswa Tantal. Titàn ta dwe itilize nan tanperati<30°C and persulfate should be limited to <2% if it must be used. The engineer can choose the right materials by knowing the transpassive behaviour of the persulfate.