Abstract
composition. Works in this direction have been carried out for a long time (more than i0 years) in the Laboratory of Protection from Corrosion and Cavitation of the B. E. Vedeneev All-Union Scientific-Research Institute of Hydraulic Engineering (VNIIG). A generalization of the results of corrosion of steel in fresh waters of various climatic zones of the USSR made it possible to propose at different stages of work two methods of approximate prediction of the corrosion of carbon steel from data on the chemical composition of the corrosive environment. For instance, in [i] an attempt was made to find the mathematical relation between the corrosion rate of steel in the initial period of time and the parameters of the chemical composition of water. The main shortcoming of the given method of prediction is that the mathematical relations were determined from the data of a comparatively small number of brief experiments with a large number of environmental factors being taken into account. This leads to a poor accuracy of the prediction~ Furthermore, the prediction does not take into account the dynamics of the corrosion process with time, in particular, inhibition of corrosion as a consequence of the formation of an oxide film on the surface of metal. In subsequent works [2, 3] the effect of the corrosion products on the rate of the process with time was taken into account, but the prediction was based on the method of analogs and had primarily a qualitative character. The task of further investigations was the development of a quantitative mathematical model of corrosion of steel in natural fresh waters taking into consideration the main active factors of the chemical composition of the environment and temporal dynamics of the process. By analogy with gas corrosion of metal, for which a parabolic law of growth of corrosion-inhibiting oxide films is characteristic, the mathematical model of the process was sought in the form
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