Thermodynamic Development of Corrosion Rate Modeling in Iron Phosphate Glasses

Schlesinger, Mark¹  Brow, Richard¹ 

[1] Missouri Univ. of Science and Technology, Rolla, MO (United States)

关键词: FORMATION HEAT;    AQUEOUS SOLUTIONS;    SPECIFIC HEAT;    IRON PHOSPHATES;    PHOSPHATE GLASS;    CORROSION;    SODIUM OXIDES;    FERRITES;    CALCIUM OXIDES;    HYDROCHLORIC ACID;    IRON OXIDES;    PHOSPHORUS OXIDES;    POTASSIUM HYDROXIDES;    TEMPERATURE RANGE 0065-0273 K;    SIMULATION;    MATHEMATICAL MODELS;    CALORIMETERS;    AMBIENT TEMPERATURE;    TEMPERATURE RANGE 0000-0013 K;    TEMPERATURE RANGE 0013-0065 K;    TEMPERATURE RANGE 0273-0400 K;    RESEARCH PROGRAMS;    POWDERS;    SOLIDS;   

DOI  :  10.2172/1047491
RP-ID  :  DOE/NEUP--09-800
PID  :  OSTI ID: 1047491
Others  :  Other: NEUP Project CFP-09-800
Others  :  TRN: US1600897

学科分类：材料科学（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

A two-year research program investigated links between the thermodynamic properties of phosphate glasses and their corrosion rates in different solutions. Glasses in the Na₂O-CaO-P₂O₅ and Na₂O-Fe₂O₃-PO₅ systems were prepared and characterized. These glasses were then exposed in bulk and powder form to acid (0.1M HCl), basic (0.1M KOH) and neutral (deionized water) solutions at varying exposure times and temperatures. Analysis of the solution and the glass after exposure determined the rate and type of corrosion that occurred. Simultaneously, efforts were made to determine the thermodynamic properties of solid iron phosphate compounds. This included measurement of low temperature (5-300 K) heat capacities, measured at Brigham Young University; the attempted use of a Parr calorimeter to measure ambient temperature enthalpies of formation; and attempted measurement of temperature heat capacities. Only the first of the three tasks was successfully accomplished. In lieu of experimental measurement of enthalpies of formation, first-principles calculation of enthalpies of formation was performed at Missouri S&T; these results will be used in subsequent modeling efforts.