11425 Development of Test Specimens for Evaluating SCC Behavior of Marine Aluminum Alloys and Assessment of the Severity of Various Marine Exposure Conditions

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Product Number: 51300-11425-SG

ISBN: 2011 11425 CP

Author: Francine Bovard, Jerry Curran, Christine Henon, Jim Towers, Rebecca Wyss, Jacob Padrul, C. Wong

Publication Date: 2011

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An evaluation of the relevance of the mass loss in ASTM G671 to the in-service stress corrosion cracking (SCC) performance of high magnesium aluminum alloys is needed to validate the mass loss requirements in ASTM B928/B928M.2 However, uniaxial SCC testing of thin gauge aluminum alloys in orientations other than short transverse (ST) cannot reliably predict SCC performance for in-service applications with an ST stress component.3 The objectives of this study were to identify an SCC test specimen and evaluate various exposure conditions. The suitability of U-Bend specimens (per ASTM G30)4 to study stress corrosion cracking was established using 5083-H321 material that was thermally treated to intentionally create a sensitized condition. The testing, which was conducted at NASA Kennedy Space Center Beach Corrosion Test Site (BCTS), demonstrates the relative severity of seacoast atmosphere, full seawater immersion, seawater spray zone, and tidal exposures. Results of this study will be used to select the environmental conditions for additional testing of 5xxx materials with varying degrees of intentional sensitization to validate the mass loss requirements specified in ASTM B928/B928M.

Key words: 5083-H321, ASTM B928/B928M, intergranular corrosion, stress corrosion cracking, seacoast atmosphere, full immersion, spray, seawater, tidal, sensitization, U-bend, pre-form.