Abstract
Slow strain rate tests in ASTM seawater using specimens prepared from a failed nickel-copper alloy bolt have shown that precipitation hardened UNS N05500 (MONEL K-500) is embrittled by cathodic protection with sacrificial aluminium anodes. Some loss of ductility also occurred when annealed UNS N05500 was coupled to aluminium anodes and when the hardened alloy was coupled to steel. Brittle fractures produced by slow strain rate tests were intergranular and were very similar in appearance to the field fractures. While the slow strain rate tests were conducted on an alloy from only one source, there is no reason to assume that UNS N05500 alloy from other sources would resist hydrogen embrittlement from standard cathodic protection systems.
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