4.6 Article

Effect of Shot Peen Forming on Corrosion-Resistant of 2024 Aluminum Alloy in Salt Spray Environment

期刊

MATERIALS
卷 15, 期 23, 页码 -

出版社

MDPI
DOI: 10.3390/ma15238583

关键词

shot peen forming; salt spray corrosion; intergranular corrosion; electrochemical test

资金

  1. National Key Research and Development Program [2021YFE0115400]
  2. Cultivation of interdisciplinary research platform of Dalian University of Technology [2020-DG-02-ZWJ]
  3. Aeronautical Science Foundation of China [201936025001]

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The effect of shot peen forming on the corrosion resistance of 2024 aluminum alloy in a salt spray environment was investigated. The results showed that shot peen forming worsened the corrosion resistance and led to severe intergranular corrosion.
The effect of shot peen forming on the corrosion-resistant of 2024 aluminum alloy in a salt spray environment was studied with an electrochemical workstation. The surface morphology and cross sectional morphology of the original and shot peen-formed sample were studied by a scanning electron microscope. After shot peen forming, the salt spray corrosion resistance of 2024 aluminum alloy was worsened (the corrosion rates of the original alloy and the shot peen-formed alloy were 0.10467 mg/(cm(2)center dot h) and 0.27333 mg/(cm(2)center dot h), respectively, when the salt spray corrosion time was 5 h). The radius of capacitive reactance arc of the sample subjected to shot peen forming was smaller than that of the original sample. When the salt spray corrosion time was 5 h, the doping density (N-A) of the original alloy was 2.5128 x 10(-13)/cm(3). After shot peen forming, the N-A of the alloy increased to 15 x 10(-13)/cm(3). For the shot peen-formed sample, pitting corrosion first occurred in the crater lap zone and became severe with salt spray time. The cross sectional morphology of both original and the shot peen-formed samples shows that severe intergranular corrosion occurred in the salt spray environment. However, for the original sample, the intergranular corrosion distribution was lamellar. For shot peen-formed sample, the intergranular corrosion distribution was network.

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