Combined with the existing corrosion mechanism analysis [], these two products belong to chlorine oxides. However, the calcium content of surface products is much higher than that of internal products. It shows that there are similar chemical compositions between the two products, but they are not exactly the same. It can be preliminarily speculated that the chemical formula of the external surface and internal products may be AMG (OH) 2 · bcacl2 · CH2O or xMg (OH) 2 · ymgcl2 · zh2o.
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