This can be explained that the diffusion rate of Cl - is higher than that of Mg2 +, so Cl - enters the system first. In order to maintain electrical neutrality, oh - began to diffuse and leach in the opposite direction, Cl - penetrated into the gelling system, and the pH in the pore solution decreased. The leached Oh - reacts with Mg2 + on the surface to form magnesium hydroxide precipitation.
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