Aircraft stress-corrosion cracking

The high strength alloys contain a Zn + Mg content well in excess of 6% and are used in specialist structures such as aircraft. The risk of stress corrosion cracking in these alloys may be accentuated by incorrect heat treatment or composition and they cannot be recommended for general use (Section 8.5). 

Rare earth metal salts Aircraft industry. Effective for pitting corrosion, stress corrosion cracking, corrosion fatigue, galvanic corrosion and crevice corrosion by using rare earth metal salts in waters for washing aircraft. Disposal of the waters is environmentally safe [4,6]... 

Source T.L Mackay and C.B. Gilpin, Stress Corrosion Cracking of Titanium Alloys at Ambient Temperature in Aqueous Solutions, Missile Space Systems Division, Astropovwer Latxxatory, Douglas Aircraft CompcNiy, ReportNo. SM-49105-F1, June, 1967... 

The total cost of material fracture is about 4% of gross domestic product in the United States and Europe (88,89). Fracture modes included in the cost estimates were stress-induced failures (tension, compression, flexure, and shear), overload, deformation, and time-dependent modes, such as fatigue, creep, SCC, and embrittlement. The environmentally assisted corrosion problem is very much involved in the maintenance of the safety and reliability of potentially dangerous engineering systems, such as nuclear power plants, fossil fuel power plants, oil and gas pipelines, oil production platforms, aircraft and aerospace technologies, chemical plants, and so on. Losses because of environmentally assisted cracking (EAC) of materials amount to many billions of dollars annually and is on the increase globally (87). 

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