The corrosion resistance of aluminium bronze in the cast condition can be improved by additions of chromium and silicon. This has been shown by testing modified alloys in various aggressive environments. The chromium addition is effective in NaCl, H2SO4 and sea water, and when silicon is also added the resistance to HCl is improved. Heat treatment significantly affects the corrosion resistance, and slow cooling from 600°c is beneficial. Addition of chromium does not result in the γ2 phase behaving anodically.
The modified alloys have high tensile strength and good ductility. It is suggested that they merit consideration for environments where attack by sea water, acid or neutral salts is a hazard.
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