Multipurpose Corrosion Inhibitors for Aerospace Materials in Naval Environments

摘要

A multidisciplinary approach was taken to solve the complex problem of premature failure of high strength aircraft alloys from the effects of environment. Principles concerning the time dependent macroscopic interfacial processes occuring at fine geometries (defect sites etc.) and responsible for sub-critical crack growth were isolated to envolve new methods for arresting cracking. It has been shown that a synergistically combined chemical system can be formulated which can modify in-situ interfacial chemistry of the crack propagation process such that the life of the material is enhanced significantly. Results show crack growth retardation effects on both steels and aluminum alloys when tested for corrosion fatigue and/or stress corrosion cracking in high humidity and saline environment. Keywords: Aerospace alloys, High strength steels, Al alloys, Crack arrestment compounds, Corrosion, Fatigue, Stress corrosion cracking, Hydrogen embrittlement, Hydrogen inhibitors, Phase transfer catalyst, Non agueous solvents, Electro chemical polarization, Crack growth rate, Stress intensity factor.