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Keywords = Disodium Monofluorophosphate

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34 pages, 91116 KiB  
Review
Corrosion Inhibition Mechanism of Steel Reinforcements in Mortar Using Soluble Phosphates: A Critical Review
by David M. Bastidas, Ulises Martin, Jose M. Bastidas and Jacob Ress
Materials 2021, 14(20), 6168; https://doi.org/10.3390/ma14206168 - 18 Oct 2021
Cited by 34 | Viewed by 5342
Abstract
The corrosion inhibition mechanism of soluble phosphates on steel reinforcement embedded in mortar fabricated with ordinary Portland cement (OPC) are reviewed. This review focuses soluble phosphate compounds, sodium monofluorophosphate (Na2PO3F) (MFP), disodium hydrogen phosphate (Na2HPO4) [...] Read more.
The corrosion inhibition mechanism of soluble phosphates on steel reinforcement embedded in mortar fabricated with ordinary Portland cement (OPC) are reviewed. This review focuses soluble phosphate compounds, sodium monofluorophosphate (Na2PO3F) (MFP), disodium hydrogen phosphate (Na2HPO4) (DHP) and trisodium phosphate (Na3PO4) (TSP), embedded in mortar. Phosphate corrosion inhibitors have been deployed in two different ways, as migrating corrosion inhibitors (MCI), or as admixed corrosion inhibitors (ACI). The chemical stability of phosphate corrosion inhibitors depends on the pH of the solution, H2PO4 ions being stable in the pH range of 3–6, the HPO42− in the pH range of 8–12, while the PO43− ions are stable above pH 12. The formation of iron phosphate compounds is a thermodynamically favored spontaneous reaction. Phosphate ions promote ferrous phosphate precipitation due to the higher solubility of ferric phosphate, thus producing a protective barrier layer that hinders corrosion. Therefore, the MFP as well as the DHP and TSP compounds are considered anodic corrosion inhibitors. Both types of application (MCI and ACI) of phosphate corrosion inhibitors found MFP to present the higher inhibition efficiency in the following order MFP > DHP > TSP. Full article
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9 pages, 2304 KiB  
Article
Preparation of MFP Microspheres Using Polyacrylate Resins for the Therapy of Osteoporosis
by A. Janka, B. Korsatko-Wabnegg and W. Korsatko
Sci. Pharm. 2000, 68(2), 213-221; https://doi.org/10.3797/scipharm.aut-00-20 - 1 Jun 2000
Viewed by 1097
Abstract
Disodium Monofluorophoshate (MFP), a highly water soluble drug, was incorporated in polyacrylate resin microspheres by using the solvent-evaporation technique. The process is based on dispersing the acetone solution of the drug and the polymer in liquid paraffin. Eudragit RS 100/S 100 in a [...] Read more.
Disodium Monofluorophoshate (MFP), a highly water soluble drug, was incorporated in polyacrylate resin microspheres by using the solvent-evaporation technique. The process is based on dispersing the acetone solution of the drug and the polymer in liquid paraffin. Eudragit RS 100/S 100 in a 3:1 ratio turned out as the best coating material. The influence of the main manufacturing factors, namely polymer-drug ratio, addition of magnesium stearate, size of the beads, production temperature and speed of stirring, on the technological characteristics of the microspheres, like release rate of the drug, shape, drug-loading and size of the particle were investigated. The findings resulted in a formulation, which obtains the desired controlled release of the drug in a convenient oral system. Full article
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