DTIC ADA058814: Corrosion of 5456-H117 Aluminum in High Velocity Seawater.

by: Defense Technical Information Center

Publication date: 1978-06-01

Topics: DTIC Archive, Gehring,G A , Jr, OCEAN CITY RESEARCH CORP N J, *ALUMINUM ALLOYS, *SEA WATER CORROSION, POLARIZATION, MICROSTRUCTURE, EXPOSURE(GENERAL), HIGH VELOCITY, ELECTRON MICROSCOPY, OXYGEN, FLOW RATE, SURFACE PROPERTIES, DATA ACQUISITION, MACROMOLECULES, DIFFUSION COEFFICIENT, CHANNEL FLOW, PITTING,

Collection: dticarchive; additional_collections

Language: English

A study was undertaken to examine the corrosion behavior of 5456-H117 aluminum in high velocity seawater. Experimental data was obtained using a high velocity flow channel operated with natural seawater. The results show that both the rate and mode of corrosion are velocity-dependent. The corrosion rate was shown to increase significantly with increasing velocity. Morphological changes were observed as a function of velocity. The observed changes suggest that the basic mechanism for high velocity corrosion of 5456-H117 aluminum involves film disruption/removal leading to enhanced micropitting about intermetallic particles. (Author)