A difference-imaging technique used to study streaking corrosion of aluminum alloys AA7075 and AA8006 in chloride solution
Hugh S. Isaacs
- 化学化工－已发表论文 
We observed corrosion forming streaks in chloride solutions along abrasion grooves, or grooves formed during rolling, using an in situ difference-imaging technique. Streaking occurred on an abraded zinc-containing alloy AA7075-T6, and also on as-received or abraded and heat-treated alloy AA8006, which is representative of alloys known to suffer filiform corrosion. In both alloys, streaking was due to a 50 nm susceptible surface layer. This similarity contrasted with marked differences in how susceptibility developed, i.e., by abrasion in Al-Zn, and thermomechanical treatments in alloys prone to filiform corrosion. Mechanisms are discussed for streaking based on pH changes around growing streaks. (c) 2005 The Electrochemical Society.