It has been shown that in order to inhibit the corrosion of iron and steel an ion must fulfil two conditions. It should form an insoluble ferric compound and it should also form a complex with peroxide ionsformed during the cathodic reduction of oxygen, thereby increasing their oxidising power. It is now shown that aluminium inhibition, in the pH range 4-11, is brought about by theformation of aluminium hydroxide (or a basic salt) and that peroxide ions play no part. The chromate ion is inhibitive at lower pH values and here the peroxide ion may be involved.
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