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Corrosion study of bare and coated stainless steelA program was conducted at Kennedy Space Center from February 1968 to February 1971 to evaluate the performance of austenitic stainless steel alloys used in fluid systems lines. For several years, there had been numerous failures of stainless steel hardware caused by pitting and stress corrosion cracking. Several alloys were evaluated for effectiveness of certain sacrificial-type protective coverings in preventing corrosion failures. Samples were tested in specially designed racks placed 91 meters (100 yards) above high-tide line at Cape Kennedy. It is concluded that: (1) unprotected tubing samples showed evidence of pitting initiation after 2 weeks; (2) although some alloys develop larger pits than others, it is probable that the actual pitting rate is independent of alloy type; (3) the deepest pitting occurred in the sheltered part of the samples; and (4) zinc-rich coatings and an aluminum-filled coating have afforded sacrificial protection against pitting for at least 28 months. It is believed that a much longer effective coating life can be expected.
Document ID
19720020896
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Technical Note (TN)
Authors
Morrison, J. D. (NASA John F. Kennedy Space Center Cocoa Beach, FL, United States)
Date Acquired
September 2, 2013
Publication Date
July 1, 1972
Subject Category
Materials, Metallic
Report/Patent Number
NASA-TN-D-6519
Accession Number
72N28546
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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