The purpose of this document is to present an investigation of the theory of corrosion prevention, with particular reference to the corrosion of metal aircraft parts. In the past, the material used in the construction of airplanes has largely been wood. Numerous considerations are leading to a gradually increasing use of metal in aircraft construction. Practically the only things which limit the life of the metal airplane are corrosion and fatigue. A study of the problem of corrosion and its prevention is, therefore, extremely pertinent at the present time.