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Ndfeb weight weight method _ ndfeb strong magnet manufacturers

by:Newland     2020-03-28
A, ndfeb material handling & ensp;     Using metallographic sandpaper to remove the surface oxide, sodium citrate solution at 70 ℃ ( 38 g· L - 1) To remove surface has been corrosion and oxidation, and then clean with distilled water, anhydrous ethanol dehydration, with filter paper blot on the surface of water.   Second, making solution & ensp; 1. Distilled water and the water & ensp;     Take only tubes and number 8, 1 & ndash; 4 in distilled water, 5 & ndash; 8 river, amount and moderate volume, respectively at 20 ℃, 35 ℃, 50 ℃, 65 ℃ temperature after 10 minutes, add in 5 grams of ndfeb material for 15 hours, respectively, dry weight, calculation & ensp;                     2. Thin - H2SO4 & ensp;           Formulate standard - H2SO4 solution 1 mol/L, take four tubes number, amount and moderate - H2SO4 solution, respectively at 20 ℃, 35 ℃, 50 ℃, 65 ℃ temperature after 10 minutes, add in 5 grams of ndfeb material for 15 hours, respectively, dry weight, calculation & ensp;   3. KCl solution & ensp;     Formulate standard KCl solution 1 mol/L, take four tubes number, equal amounts, and a moderate amount of KCl solution at 20 ℃, 35 ℃, 50 ℃, 65 ℃ temperature after 10 minutes, add in 5 grams of ndfeb material for 15 hours, respectively, dry weight, calculation & ensp;   4. KOH solution & ensp;     Formulate standard KOH solution mol/L, & ensp; Take four tubes number, equal amounts, and a moderate amount of KOH solution at 20 ℃, 35 ℃, 50 ℃, 65 ℃ temperature after 10 minutes, add in 5 grams of ndfeb material for 15 hours, respectively, dry weight, calculation & ensp;   5. Different concentrations of salt & ensp;     Preparation & ensp; 0. 1mol/L,0. 3 mol/L,0. 5 mol/L,0. 8 Mol/L KCL solution, take four tubes add to the amount and proper solution in a test tube, after the 20 ℃ temperature with 5 grams of ndfeb material, immerse 15 hours, dry weight, calculation & ensp;   6. Different PH & ensp;                   Different PH value of solution, PH, respectively 1, 3, 5, 8, 10. Take 5 tubes number, only in 20 ℃ constant temperature for 10 minutes, 5 g each join ndfeb, immerse 15 hours, dry weight, calculation
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