Abstract
The corrosion properties in NaCl solutions at room temp. of the various phases present in aluminium bronzes are investigated over periods up to 850 h by combination of electrode kinetic, quantitative analytical, electron microscopic and X-ray methods. Experimental results on binary α-phases are fully compatible with the proposed model based on a porous Cu 2O layer doped with Al 3++ ions. In contrast to α and hypoeutectoid martensites, hypereutectoid martensites and Ύ 2-rmphases are not able to develop a sufficiently thick protective layer and show an increasing susceptibility to dealuminization by the dissolution-redeposition mechanism. κ-phases and related intermetallic compounds present in iron and nickel containing aluminium bronzes tend to passivate. Conclusions with respect to the behaviour of complex Cu-Al-Fe-Ni alloys used in practice are drawn.
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