Potassium fluoride,anhydrous
           Potassium fluoride,extra pure
           Potassium fluoride,Granular
           Silicon Dioxide
           Hydrofluoric acid
           Synthetic Cryolite
           Potassium Fluoaluminate
           Ammonium bifluoride
           Potassium Bifluoride
           Aluminium fluoride
           Sodium fluoride
           Potassium Fluorosilicate
           Fluorosilicic Acid
           Sodium silicofluoride
           Potassium Hydroxide Flakes
           Magnesium Fluoride
           Magnesium fluorosilicate
           Barium Fluoride
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In this paper, Mg–Nd–Zn–Zr alloy (denoted as JDBM) coated with hydrofluoric acid (HF) chemical conversion film (MgF2) was researched as a potential biodegradable cardiovascular stent material. The microstructures, in vitro degradation and biocompatibility were investigated. The field emission scanning electron microscopy (FE-SEM) and X-ray photoelectron spectroscopy (XPS) showed that a compact MgF2 film was formed on the surface of JDBM. The corrosion rate decreased in artificial plasma from 0.337 to 0.253 mm·y? 1 and the electrochemical measurement demonstrated that the corrosion resistance of JDBM alloy could be obviously improved due to the protective MgF2 film on the surface of the substrate. 

Meanwhile, the hemolysis ratio of JDBM decreased from 52.0% to 10.1% and the cytotoxicity met the requirement of cellular application after hydrofluoric acid treatment. In addition, JDBM and MgF2 film showed good anti-platelet adhesion, which is a very favorable property for implant material in contact with blood directly.

With an indicator method and potentiometric titration, tetrabutylammonium hydroxide, sodium hydroxide, potassium hydroxide and sodium methylate as titrant, respectively. Methanol or ethanol as a solvent for lithium ion battery electrolyte Determination of free acidity were studied. The effects of the presence of the electrolyte solvent stabilizer and trace water to the results were analysis. The results showed that the optimum conditions for hydrofluoric acid electrolyte oxygen measured as follows: ethanol as solvent, potassium hydroxide titrant, test method was potentiometric titration. The presence of trace moisture in ethanol does not affect the test results, the addition of stabilizers will increase the alkaline electrolyte was measured indicator method will bring greater error.