期刊
CORROSION SCIENCE
卷 126, 期 -, 页码 265-271出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2017.07.008
关键词
Aluminium; Acid corrosion; Segregation
资金
- UK Engineering and Physical Sciences Research Council (EPSRC) [EP/H020047/1]
- China Scholarship Council
- EPSRC [EP/H020047/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H020047/1] Funding Source: researchfish
The present work investigates the corrosion behaviour of machined AA7150-T651 aluminium alloy. It is found that machining operation introduces a near-surface deformed layer, characterized by ultrafine grains and segregation of Mg and Zn at grain boundaries, to the alloy. The near-surface deformed layer is electrochemically more active compared with the bulk alloy, therefore, is preferentially corroded during immersion in an 3.5 wt.% sodium chloride solution acidified to pH 3.2. The open circuit potential of the machined alloy shows a transient at the beginning of immersion in the solution, due to the preferential dissolution of the near-surface deformed layer.
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