This post includes our CORROSION 2014 presentation on selecting corrosion resistant alloys for seawater service.
What is the localized corrosion resistance of the Nickel alloy 718 (UNS N07718) in oxidizing chloride containing environments like seawater? This articles gives some clues.
SCC of AZ31B alloy was studied in NaCl solutions at different potentials and chloride concentrations using the slow strain rate technique. A combination of pre-exposure tests followed by immediate straining or straining after a dry air exposure delay helped to weight the relative importance of anodic damage accumulation versus increased hydrogen charging during open-circuit potential pre-exposure. The dependence of ductility with pre-exposure time and the fracture surface of embrittled samples suggest that hydrogen embrittlement of AZ31B was controlled by hydrogen diffusion.
This abstract has been submitted to the upcoming NACE International CORROSION/14 Research in Progress Session on Passivity and Localized Corrosion. By: Mariano Iannuzzi Coauthors: Mauricio Rincón-Ortiz (first author), Mariano Kappes, Martín A. Rodríguez, Ricardo Carranza, and Raúl Rebak. In the offshore oil and gas industry, materials selection philosophies are traditionally based on the International Standard Organization (ISO) 21457 […]