However, the diffraction peak intensity and m − s − h arc height of Friedel salt and magnesium oxychloride crystals are slightly lower than those of the permeable layer, which can qualitatively indicate that the content of Friedel salt, magnesium oxychloride and m − s − h generated in the matrix layer is lower than that of the permeable layer, and the corrosion degree is lower than that of the permeable layer.
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