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Conclusions
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Calcium Sulfate - CaSO4
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The lead sulfate don't
crystallize every time on the calcium sulfate crystals;
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After the "reduction" phase the calcium sulfate
crystals remains on the surface;
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The crystallization of the lead sulfate appear
later than in barium sulfate or strontium sulfate.
Bismuth Sulfate Bi2(SO4)3
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The crystallization of the lead sulfate crystals is
not influenced by the additions of bismuth sulfate;
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The bismuth sulfate crystals catalyze the formation
of the H2 molecules;
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The bismuth sulfate crystals hydrolyze (Bi sulfate
absorb some OH ions) and during th polarization the Bi metallic can
appear.
Others Sulfate
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It can be interesting to extend the investigations
to
some other sulfates in order to
understand the phenomena which occur at the negative electrode.
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