アルミニウムとその合金の酸・アルカリおよび酸化還元剤の添加による腐食

抄録

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, H₂SO₄ and HNO₃ were used as acids, NaOH as alkali, KMnO₄ and K₂Cr₂O₇ as oxidizing agents, and SnCl₂ and NaHSO₃ as reducing agents.
The result revealed that corrosion was most active when SnCl₂ was used, and was next active in the cases of KMnO₄ and K₂Cr₂O₇.
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.