11621Prevention of CF

A number of methods are available for reducing a material's susceptibility to CF. However, the methods tend to reduce crack growth rates, that is, increase fatigue lifetimes, rather than eliminate CF entirely. These methods include:

• Increasing the corrosion resistance of the material, for example, by addition of Cr to steels

• Reducing the aggressivity of the environment (dilution) or addition of inhibitors

• Deaerating solutions (which avoid crevice-type conditions for passive alloys) and using lower solution temperatures

• Lowering the applied stress or induce surface compressive residual stresses (shot peening)

• Prevent metal/environment contact by applying coatings, for example, plating or painting

• Apply cathodic protection by reducing the potential or attach sacrificial anodes, for example, Zn or Al alloys

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