Studies on the Corrosion of Tin. I : Corrosion in Hydrochloric Acid

概要

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The corrosion testing of tin in hydrochloric acid solution was studied. At the beginning of this research, condition of making specimens was selected from the data of preliminary experiments and following experiments were carried out by using specimens prepared under that condition. (1) Relation between the corrosion rate of tin and concentration of hydrochloric acid solution. (2) Influence of stirring. (3) Influence of temperature rising. (4) Influence of addition of potassium bichromate, sodium nitrate, formaldehyde, sodium sulphite, stannous chloride and cuprous chloride on the corrosion rate of tin. (5) Corrosion velocity curve. And following facts were concluded from experiments : (1) Tin in hydrochloric acid shows the passive state at the acid concentration below 0.01 per cent. (2) The depolarizing corrosion increases with concentration from 0.01 to 3 per cent. (3) The depolarizing corrosion becomes complete at the concentration from 3 to 15 per cent. (4) The hydrogen evolution type of corrosion increases with the concentration from 15 to 25 per cent. (5) The hydrogen evolution type becomes complete at the concentration above 25 per cent.
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