METHOD OF ACCELERATED MATERIAL TESTING METAL CON-STRUCTION BASED ON MULTIPHASE ALLOYS

Abstract

Purpose. Based on the quantitative assessment of the corrosion rates of multiphase metals and alloys, methodology for accelerated corrosion tests under conditions of electro-chemical corrosion with the determination of corrosion rates for each phase and mass corrosion damage of metal structures during the specified time of their operation was developed.
 Research methods. Achieving the solution of the set goal is based on the application of computational and experimental methods of evaluating the electro-chemical corrosion of multi phase alloys with the determination of corrosion rates for each phase separately and oxidation rates in general for the alloy.
 Results. The final formula and methods of conducting laboratory experiments on the assessment of corrosion rates of multi phase alloys were obtained. Methods of accelerated corrosion tests based on preliminary laboratory studies with accurate calculation of technological parameters prolonged during the operation of a real structure in conditions of electro-chemical corrosion are given.
 Scientific novelty. New mechanisms for estimating the corrosion rates of individual phases of multiphase alloys of the residual micro-heterogeneity of the corrosion surface under conditions of an uncertain total thickness of the corrosion layer was shown. An algorithm for calculating the technological parameters of accelerated tests, equivalent to the real conditions of operation of metal structures based on multiphase alloys during the given period of operation, is proposed.
 Practical value. The proposed approach makes it possible to determine the quantitative parameters of electrochemical corrosion of metal structures, calculate the reduction in load-bearing capacity, and assess the performance of such structures during a given period of operation.