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Pickling Mechanism

pickling mechanism Hydrochloric acid pickling is the result of dissolving, stripping and reducing. dissolution Dissolving by exterior inside, more mainly is the splitting of oxidized iron sheet penetration, so that the three components of oxidized iron sheet dissolved simultaneously. pickling...

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  pickling mechanism

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   Hydrochloric acid pickling is the result of dissolving, stripping and reducing.

   dissolution

   Dissolving by exterior inside, more mainly is the splitting of oxidized iron sheet penetration, so that the three components of oxidized iron sheet dissolved simultaneously.

   pickling mechanism  The equation is as follows:

   Fe203 HCL + 6 = 2 fecl + 3 h20

   Fes04 HCL + 8 = 2 fecls + FeCL2 + 4 h20

   Fe0 HCL = FeCL + 2, + H20

   peeling actionBy dissolving

   the iron oxide, the acid leaches directly into the iron matrix and reacts with it: hydrogen gas generated under the skin of

    Fe+ 2hcl-fecl2 +H2 (weak)

 iron oxide causes the iron oxide to peel off from the iron matrix.

   reductionHydrogen ions in the acid are highly reductive, it can reduce the high iron oxide to soluble ferrous oxide, and make

    pickling mechanism The reaction formula of reducing dissolved trivalent iron into bivalent iron is as follows:

   Fe203 feo + 2 h + = 2 + H0

   Fe20, + 6 h = Fe0 + fe 2 + 3 h0

   FeClo + H + = FeCl + HC1

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