The review traces the history of the role of iron corrosion products as a corrosion inhibitor with particular reference to (a) the presence of iron corrosion products in the cooling water derived from either sacrificial galvanic iron protector blocks
or by injection of ferrous sulphate into the system; (b) iron corrosion products provided from iron incorporated as an alloying element in the tube or tube plate material, considering in particular copper-zinc, copper-nickel and aluminium-bronze alloys.
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