PROTECTIVE COATING AND ITS INFLUENCE ON CORROSION BEHAVIOR OF METAL CONTAINERS FOR HIGH-LEVEL WASTE IMMOBILISATION

The article explores nickel-based protective coatings and their influen e on high-temperature changes occurring on the inner surface of steel containers designed for HLW immobilization provided their interaction with the melts of model waste form materials. It evaluates the corrosion behavior of container surfaces with a nickel-based protective coating depending on its application method, i.e., galvanic and chemical. The study indicates the factors governing the corrosion depth, i.e., the depth to which the container steel surface may get altered depending on 4 different waste form material compositions. The study demonstrates high efficien y of the galvanic method in terms of nickelbased protective coating application and the major influen e that high sodium and calcium content has on the depth of corrosion penetration into container surface.

Keywords: radioactive waste, immobilization, borosilicate waste form materials, steel container, corrosion.

Lebedev A . S ., Eremyashev V . E ., Rassomahin M . A ., Korinevskaya G . G . Protective Coating and Its Influence on Corrosion Behavior of Metal Containers for High-Level Waste Immobilisation. Radioactive Waste, 2024, no. 1 (26), pp. 47—56. DOI: 10.25283/258 -9707-2024-1-47-56 (In Russian).