Rau Qib 7 Titanium Heat Qws Siv los tuav 120℃hauv 40% Potassium Fluoride Solution rau Hlau Ntxuav, Yuav Ua Li Cas Fluoride Ion Concentration (2 vs . 5 M) Hloov Cov Corrosion Rate ntawm 0.02 mus rau 0.15 mm / xyoo los ntawm Kev Tsim Soluble TiF₆²

Ntawm 120 degree, fluoride ion (F^−) tsim cov soluble hexafluorotitanate complexes hauv 40% potassium fluoride (KF): Ti4+ + 6F− TiF62−. Tus nqi corrosion ntawm Qib 7 titanium hauv 2 MF⁻ (kwv yees . 12% KF) yog 0.02-0.05 mm / xyoo. Corrosion tus nqi yog 0.12-0.25 mm / xyoo ntawm 5 MF^- (kwv yees . 30% KF). Lub dissolution ntawm cov zaj duab xis passive ua sai dua nrog nce fluoride concentration. Kev tawm tsam yog txawm thiab tsis muaj pitting. Fluoride Induced Corrosion Mechanism Fluoride ions complex titanium ions thiab tiv thaiv kev tsim ntawm TiO₂ zaj duab xis ruaj khov. Tus nqi ntawm cov tshuaj tiv thaiv yog proportional rau [F⁻]4. Lub corrosion pib nrog active dissolution kinetics. Qib 7's palladium yuav muab qee qhov kev tiv thaiv, tab sis yuav dhau los ntawm cov tshuaj fluoride siab ntau. " Table 3: Quantitative corrosion rate vs fluoride concentration KF concentration (M) F- concentration (M) Qib 7 corrosion rate (mm/year) Qib 2 corrosion rate (mm/year) 1 1 0.01-0.02 0.02-0.04 2 2 0.02-0.05 0.04-0.10 3 3 0.04-0.08 0.08-0.18 4 4 0.06-0.15 0.15-0.35 5 5 0.10-0.25 0.25-0.60 Guide to Fluoride Tolerance (7 degree) Fluoride℃(max) Corrosion Rate (mm/xyoo) Xav Tau<2 120 <0.05 2-3 100 <0.05 3-4 80 <0.05 >4 Not recommended >0.10 Sau Cov Lus Qhia Zoo Siab Cov tshuaj fluoride cov ntsiab lus ntawm qhov kub siab yuav tsum tsis muaj titanium. Siv PTFE coated cua sov los yog tantalum. Tus engineer tswj cov tshuaj fluoride concentration thiab kub los xaiv cov ntaub ntawv tsim nyog.