Abstract
Complex alloying of low-carbon steel with treatment by artificial concentrated solar radiation (CSR) in air using a LaB6-based composite is studied. The distribution of elements through the thickness of the alloyed layer along the axis of CSR entry and at the periphery of the working zone is established. On the basis of electron-probe microanalysis, x-radiographic, and metallographic data it is established that as a result of high-temperature oxidation of the composite, formation of new phases, and convective mass transfer under CSR conditions, a graded structure forms at the steel surface in the form of a dense three-layer oxide film. Its outer layer contains lanthanum and nickel chromites that provide high resistance to marine corrosion.
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