Corrosion Behavior of Magnetite Grown from Amine-Carboxylate and Amine Aqueous Solutions

摘要

A unique boiler water treatment using amine-carboxy-late and amine for the application in the temperature range of 150-364 deg C and at pressures from 0.5-20 MPa has been developed.The size of the magnetite formed by this method is very fine 0.3-1.5 urn,while that of magnetite formed by the conventional boiler feedwater treatment is 20-40 Mm.Laboratory test results have shown that the specimens treated with this magnetite have good corrosion resistance in both severe acidic and caustic environments,while those formed by the conventional boiler feedwater treatment experience severe general and pitting corrosion.Results from an actual power plant test show the same corrosion behavior as in the laboratory tests.The formation of this fine and tight magnetite on the boiler tube inner surface is very effective for corrosion suppression.