Kev Kho Hniav Fluorination Li Cas (Plasma vs. Chemical) ntawm PFA (Perfluoroalkoxy) Rhaub Tube Hloov Lub Cev Sib cuag nrog dej li ntawm 110℃mus rau 150℃thiab txo qhov Scale Adhesion hauv siab -Tub kub Brine los ntawm 70%?
Tso lus
Lub fluorination ntawm PFA nto txhim kho cov fluorine cov ntsiab lus ntawm qhov chaw thiab boosts nws hydrophobicity. Lub plasma fluorination (CF4 plasma) ua rau kom muaj kev sib cuag lub kaum sab xis nrog dej ntawm 110℃mus rau 130-140 degree. Tshuaj fluorination (F 2 gas) txhim kho lub kaum sab xis ntawm 140-150 degree. Nyob rau hauv qhov kub thiab txias brine, lub kaum sab xis siab dua ua rau cov nplai adhesion tsawg dua, txij li cov nplai tsim ions tsis lo nrog rau qhov chaw hydrophobic. Ntawm qhov chaw fluorinated, adhesion yog txo los ntawm 50-70% thiab lub sijhawm ntxuav yog nce 2-3 zaug.
Fluorination-Induced Hydrophobicity: Mechanism
PFA nto muaj lub kaum sab xis ntawm 105-115℃lawm. Qhov ntom ntawm CF₃ thiab CF₂ pawg ntawm qhov chaw nce nrog cov ntshav thiab tshuaj fluorination. Cov pab pawg no muaj lub zog saum npoo tsawg thiab ua rau saum npoo ntau dua hydrophobic (ntau dua lub kaum sab xis sib cuag). Qhov tseem ceeb ntawm qhov nro yog txo los ntawm 18 mN / m rau 12-15 mN / m.
Quantitative Contact Angle thiab Scale Adhesion Versus Fluorination Method
Txoj Kev Kho Mob Sib cuag Lub kaum sab xis (degree) Scale Adhesion Force (N/m2) Scale Thickness Tom qab 500h (μm) Ntxuav Zaus Txo
Tsis muaj 105-115 10-20 100-200 1 × Plasma (CF₄) 130-140 5-10 40-80 2-3 × Tshuaj (F₂) 140-150 3-6 20-40 3-5 × Tshuaj + annealing 145-155 2-5 15-30 5-7 × Fluorination Method Selection Guide
Daim Ntawv Thov Kev Pom Zoo Pom Zoo Kev Kho Mob Sib cuag Lub kaum sab xis (degree) Scale Reduction
Tsawg scaling Tsis muaj 105-115 0%
Plasma fluorination nruab nrab ntsuas -nce 130-140 50-60%
Kev ntsuas siab tshuaj fluorination 140-150 70-80%
Kev ntsuas hnyav chemical + annealing 145-155 80-90%
Tus kws tshaj lij Specification
For PFA heater in high-temperature brine service, specify surface fluorination using F 2 gas (chemical treatment) to raise contact angle to >140℃thiab txo qhov adhesion los ntawm 70%. "Peb fluorinate saum npoo kom txo tau fouling thiab nce lub sij hawm ntawm kev ntxuav," tus engineer hais.
