Fretting fatigue prevention

Erosion-corrosion (as impingement or water drop corrosion) is a serious problem since it keeps the active state of magnesium at low pH values or prevents the formation and stability of the passive layer in alkaline solutions. Preventive measurements of erosion-corrosion and fretting fatigue corrosion include better passive surfaces that can be achieved by inhibitors, surface treatments and selected coating to improve wear resistance and wear corrosion of Mg alloys. 

Mechanical effects Corrosion can often be initiated or intensified by the conjoint action of mechanical factors. Typical examples include the presence of inherent or applied stresses, fatigue, fretting or cavitation effects. Inhibitors that are effective in the absence of some or all of these phenomena may not be so in their presence. In fact it may not always be possible to use inhibitors successfully in these situations and other methods of corrosion prevention will be required. 

Processes that induce compressive stresses into the surface of the metal such as shot-peening, carburizing, and nitriding are frequently beneficial in preventing corrosion fatigue and fretting corrosion. 

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