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By defnition, brass alloys include zinc as one constituent element. When that zinc

selectively corrodes, in a process known as dezincifcation, it is easily identifable by

the pinkish hue o the copper let behind.

Dezincifcation

Propellers of nickel aluminum bronze

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Propellers of manganese bronze

Propellor crack found after Liqiud Penetrant test

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131 ton propeller in Emma Maersk

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Brass Propellor

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Titanium in ships

Friction Stir Welding in Titanium