The production from simple and easily accessible materials and use of an environmentally safe, glassy, metaphosphate composition (GMC) (the formula is patented) for comprehensive protection of the elements of water-heating systems from corrosion and salt deposition (scale) are examined. The results of experiments investigating the solubility and anticorrosion and antiscaling properties of the GMC are presented.Basing the production of composite glassy materials on phosphates makes it possible to significantly expand their use by varying their properties in a wide range [1].In the present work we pose the problem of obtaining a glassy metaphosphate composition (GMC) to be used for water treatment for the purpose of protecting the elements of water-heating systems from corrosion and salt deposition (scaling).It is well known that the solubility of individual metaphosphate glasses depends first and foremost on the nature of the cation. For example, sodium metaphosphate slowly dissolves in cold water but in time the concentration of the solution can increase to 70%. Calcium metaphosphate has low solubility, which depends mainly on temperature [2].Systems filled with hot water become unserviceable mainly because corrosion damages metal surfaces and reduces the diameter of the flow openings because of salt deposition, which reduces heat emission, raises the temperature of the metal parts of heating elements, and decreases the service life of water-heating systems.These problems do not vanish when metallic surfaces are replaced with plastic ones, since salt deposits are formed on any surfaces, and shut-off units are made of metals which must be protected from corrosion. The products of corrosion that enter the water degrade its user properties.To solve these problems we propose using GMC with patented formulas for water treatment [3].The advantages of GMC include the following: environmental safety, neutrality (no effect on the pH of the treated water), convenience in handling, and unlimited shelf life provided that the technical requirements are met.A specific advantage of GMC is its limited constant spontaneous solubility in water, determined by the composition which is picked depending on the properties, planned flow rate, and temperature of the water being treated, making it possible to maintain the concentration of the GMC within the required limits without using dispensing equipment.The anticorrosion properties of GMC involve the formation of a thin continuous phosphate film on the surface of the elements of the water-heating apparatus; the thickness of the film remains unchanged in the course of operation, since its top layers, which can be removed as new portions of water arrive, are renewed. Moreover, if the feeding of the composition into the water is stopped, this film remains protective for at least one month [4].The antiscaling properties of GMC manifest in the reduction of the amount of salt deposits (scale) on the elements the water-heating equipment, evidently because the coagulation of colloidal particl...
The paper investigates two different protective phosphate compositions for the chemical treatment of water and the use of them with a view to improve quality of “make-up” water in water heating systems. The research proved a positive effect of reducing the corrosive activity of water and the amount of scale.
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