Abstract
Simultaneous impregnation of mild steel with boron and silicon was conducted by electrolysis in a salt bath consisting of sodium metasilicate, borax and carborandum. Four types of microstructures were found in diffusion coatings as a result of changing the composition of the salt bath. In the first type, the outside layer of the diffusion coating consists of wedge-shape FeB which embraces small particles of αFe-Si solid solution, while the inside layer consists of Fe2B and lumps of αFe-Si solid solution. In the second type, the outside layer consists of Fe2B which similarly embraces small particles of αFe-Si solid solution, the intermediate layer of thick layer of αFe-Si solid solution, and the inside layer of granular shape of Fe2B contiguous to substrate. In the third and fourth types, the coatings consist of dense or porous layer of αFe-Si solid solution and of granular shape of Fe2B contiguous to substrate. In all cases electron probe micro-analysis showed no solubility of Si into Fe-B compounds.
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