It is a well-known fact that aluminum is an amphoteric compound and is corroded by acid and alkali. In the present study, small quantities of oxidizing agent and reducing agent were added to acid and alkali and their effects on corrosion were examined.
For the experiments, HCl, H
2SO
4 and HNO
3 were used as acids, NaOH as alkali, KMnO
4 and K
2Cr
2O
7 as oxidizing agents, and SnCl
2 and NaHSO
3 as reducing agents.
The result revealed that corrosion was most active when SnCl
2 was used, and was next active in the cases of KMnO
4 and K
2Cr
2O
7.
From the above fact, it has become known that coexistence of heavy metal ions, no matter whether they are oxidizing agents or reducing agents, accelerates corrosion.
Similar experiments were carried out on duralumin.
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