期刊
CORROSION ENGINEERING SCIENCE AND TECHNOLOGY
卷 57, 期 3, 页码 243-253出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/1478422X.2022.2028345
关键词
Friction stir welding; ultrasonic impact treatment; corrosion; fatigue life
资金
- National Natural Science Foundation of China [51775355]
The friction stir weld joints of 2024-T4 can be strengthened by ultrasonic impact treatment (UIT), resulting in refined grains and residual compressive stress on the surface. This treatment reduces the corrosion rate and extends the lifespan of the samples, exhibiting uniform corrosion.
Friction stir weld joints of 2024-T4 are strengthened by ultrasonic impact treatment (UIT). After ultrasonic impact treatment, the grains on the surface of the sample are refined to form a dense deformation layer, and residual compressive stress is applied on the surface of the sample. The corrosion rate and mass-loss rate of the UIT sample are significantly lower than those of the non-UIT sample, and uniform corrosion is exhibited. The average life of the UIT samples in the air is 1.74 times that of the non-UIT samples; meanwhile, the average life of the UIT samples in 3.5% NaCl solution is twice that of the non-UIT samples. The crack sources of the UIT sample in the air shift from the surface to the subsurface below the strengthening layer, whereas those of the sample in the 3.5% NaCl solution are located in the corroded area on the surface of the sample.
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