11423 Development of a Stress Corrosion Test Specimen for Determining the Stress Corrosion Resistance of Aluminum 5XXX Marine Alloys

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Product Number: 51300-11423-SG

ISBN: 2011 11423 CP

Author: Thomas J. Summerson

Publication Date: 2011

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ASTM Task Group B07.03/G01.09 needed a stress corrosion test specimen for relating nitric acid mass losses (ASTM G67) cited in ASTM B928 to stress corrosion resistance in marine environments. ASTM B928 was established in 2004, following an inspection survey in 2002 of several boats exhibiting stress corrosion cracking in hull and deck plates of 5083-H321. (1) The intent of B928 is to prevent use of alloys and tempers that are not resistant to intergranular corrosion, exfoliation and stress corrosion. Resistant tempers cited in B928 are –H116 and –H321. This paper describes how a preform- stressed specimen configuration was found to serve this purpose. Results of Point Loma, CA. atmospheric test of preformed samples of sensitized 5083-H321 in both sheet and plate thicknesses are provided. This led to the ASTM Task Group’s current use of a modified perform specimen configuration (U-Bend) for more extensive SC tests of the 5XXX alloys with varying mass loss values.