Methanolic environments, stress corrosion cracking

For commercially pure titanium, the specific environments to be avoided are pure methanol and red, fuming nitric acid " , although in both environments the presence of 2% of water will inhibit cracking. On the other hand, the presence of either bromine or iodine in methanol aggravates the effect. When it does occur, stress-corrosion cracking of commercially pure titanium is usually intergranular in habit. 

Many titanium alloys are susceptible to stress-corrosion cracking in aqueous and methanolic chloride environments. 

R.C. Newman, W. Zheng, R.P.M. Procter, Stress-corrosion cracking of carbon-manganese steeb in methanol-ammonia environments—II. Electrochemical and fractographic studies, Corros. Sci. 

The two principal forms of stress-corrosion failure are (a) hot salt cracking and (Z)) room-temperature cracking, the latter occurring in both aqueous and methanolic chloride environments, and in N2O4. In addition, environmental failures can occur in alloys in direct contact with some liquid and solid metals, and certain gases. 

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