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| Technical documentation |
| Hydrochloric acid cleaning mechanism |
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1.1 the process of dissolving iron oxide
This view is based on the chemical dissolution of iron oxide and release hydrogen bubbles during the mechanical stripping, the reaction:
Fe0 2HCl - FeCl2 H2O
Fe203 6HCl - 2FeCl3 ten 3H2
Fe 2HCl - FeCl2 H2
1.2 of this statement based on the electrochemical process with oxide (including Fe2O3, Fe3O4 or Fe203, Fe304, FeO) of the metal, pickling time is reduced to ferrous oxide in the acid soluble ferrous oxide electrochemical process. The reaction:
Fe3 e - Fe2
H1 e - [H]
2 [H] - H2
These two mechanisms of pickling makes sense, but according to our small study found that many first mechanism is dominant. Our test conditions is to scale-pipe with a concentration of 5 hydrochloric acid into the beaker, heated to 50''C, a few hours later, found in the dirt and wall junction, release air bubbles (H2), dirt into a film strip, and finally All out. Also found in the actual cleaning of large scale piece of undissolved, which further confirms the first mechanism is dominant. |
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