Corrosion fatigue crack growth of three steels namely: AISI C1018, AISI 4340, and Stainless 17-7PH is studied in various environments. Testing medias include natural sea water, polluted sea water from an industrial site, drinking water produced from desalination process, and laboratory environments. Results obtained for the three steels are consistent in showing that polluted sea water is the most aggressive environment followed by low bicarbonate and alkalinity drinking water, then natural sea water. An attempt is made to explain this extraordinary aggressiveness of the polluted sea water and drinking water.

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