**8.1 Nature of the metal**

*Corrosion Inhibitors*

**7.10 Fretting corrosion**

• Temperature

• Environment

thus causing wear.

• Metallurgical factors

which affect fretting corrosion are:

• Magnitude of relative motion

Fretting is a wear phenomenon enhanced by corrosion. It involves wear of a metal or alloy when in contact with another solid material in dry or humid air. Fretting is the result of abrasive wear surface oxide films, which form a contacting surfaces under load in atmospheric air which is shown in **Figure 10**. The factors

Due to slight motion such as vibration, surface oxide and underlying metal, gets spoiled. The metal particles as a result of wear get oxidized to hard oxides which act as an additional abrasive medium. Further, the motion grinds the oxides particles

It is a special type of erosion corrosion which is caused due to the formation of vapor bubbles in a corrosive environment near a metal surface and when the

**10**

**Figure 11.**

**Figure 10.**

**7.11 Cavitations corrosion**

*Schematic representation of cavitation corrosion.*

*Schematic representation of fretting corrosion.*

