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· Acid Washing Mechanism

- Jul 10, 2018 -

 acid washing mechanism

    Hydrochloric acid pickling cleaning oxidized sheet is the result of dissolution, peeling and reduction.

    By the dissolution of the outer surface through the inner, and more importantly, the penetration of the oxide sheet cracks, so that the three components of the oxide sheet dissolved at the same time.Equation is as follows:

                                       Fe203+6HCL=2FeCL3+3H20

                                       Fes04+8HCL=2FeCL3+FeCL2+4H20

                                       Fe0+2HCL=FeCL2+H20

   Through the dissolution of the oxidized iron sheet, the acid penetrates directly into the iron matrix and reacts with it:

                                        Fe+2HCL=FeCL2+H2 

      

   The pressure caused by hydrogen produced under the skin of iron oxide causes the iron oxide sheet to peel off the iron matrix.

     The reducibility of hydrogen ions in acids is very strong. It can reduce the high-priced iron oxide to soluble ferrous oxide and the dissolved trivalent iron to divalent iron. The reaction formula is:                                          

                                    Fe202+2H*=2Fe0+H20

                                    Fes04+6H+=Fe0+2Fe+3H20

                                    FeCl,+H=FeCl,+HC1