中國有色金屬學(xué)報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 21 No. 6 June 2011 |
（1. Division of Marine System Engineering, Mokpo Maritime University, Mokpo City, Jeonnam 530-729, Korea
2. Media Engineering, Seoul National University of Technology, Seoul 139-743, Korea;
3. Korean Register of Shipping, Tokyo Branch Office, 3rd F, Sanko BLDG’, 4-11,
Nohonbashi Kodenma-cho, Cho-ku, 103-0001, Tokyo, Japan）
Abstract:The corrosions resulting from defects in painting layers frequently occur in Al alloys, so the application of corrosion preventing systems is also very important. Optimum conditions in terms of electrochemistry in relation to solution treatment, quenching and artificial aging treatment were established in order to optimize precipitation strengthening conditions intended to enhance the strength of Al alloys. Slow strain rate tests (SSRT) at various applied potentials were conducted in potential range from −1.8 to −0.5 V. The results show that the maximum tensile strengths, elongations and time-to-fracture are shown to be high values. After precipitation strengthening heat treatment, a tendency appear that time-to-fracture increases as elongation increases. In the potential range from −1.3 V to −0.7 V, the specimens show excellent mechanical properties, and thus this range is considered to be a corrosion prevention range.
Key words: Al alloy; slow strain rate test; electrochemistry; precipitation strengthening heat treatment; mechanical property
