Corrosion fatigue is mechanical degradation process in
both a corrosive and under cyclic loading conditions. Corrosion fatigue
can occur in most of the materials. In corrosion fatigue, the crack propagates by the
means of the trans-granular mechanism through the grain surface. Corrosion fatigue generates brittle
fracture conditions. It increases the rate of crack propagation and changes the
stress cycle frequency. Corrosion fatigue decreases the fatigue life of the
metal. Corrosion fatigue can be prevented by vibration controlled conditions,
proper material selection, proper design to reduce stress, use of inhibitors
and coatings etc.
Diffusion is the process of movement of atoms from high concentration to low concentration in a material. Adolf Fick first discussed the molecular diffusion in binary components. Fick’s first law of diffusion for a binary mixture depends on flux, diffusion velocity, molar concentration, and temperature gradient. In the diffusion process, atoms change their original positions relative to the adjacent atom due to gradients. The gradient can be a concentration gradient, magnetic gradient, temperature gradient or stress gradient. Diffusion mechanisms involve vacancy diffusion, interstitial diffusion, substitutional diffusion, self-interstitial, self-diffusion, etc. Diffusion process can be either steady-state or non-steady-state process, which depends on flux i.e. the net number of atoms crossing a unit area per unit time in a particular direction. Some important factors that influence diffusion are diffusing material, temperature, crystal lattice, defects, etc.
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