A novel biodegradable high nitrogen iron alloy with simultaneous enhancement of corrosion rate and local corrosion resistance

doi:10.1016/j.jmst.2023.01.009

Abstract

Abstract: To improve the corrosion rate and suppress the local corrosion, a novel biodegradable high nitrogen (N) FeMnN alloy was developed, and the effects of N content on the corrosion behaviors were systematically investigated. It was found that, as the N content increased, the corrosion rate was significantly enhanced in both Hank's solution and simulated gastric fluid. Meanwhile, as the N content increased, the size and depth of pits decreased obviously, and the number of pits increased, which presented a more uniform corrosion morphology. X-ray photoelectron spectroscopy (XPS) results indicated that N existed in the form of NH₄⁺ in the corrosion products and [FeN] clusters in the matrix. The [FeN] clusters would simultaneously improve the corrosion rate and suppress the local corrosion, which provides a new perspective for the development of biodegradable Fe alloy.

Key words: Biodegradable, Iron alloy, High nitrogen, Corrosion rate, Local corrosion

Sihan Lu, Qingchuan Wang, Yi Zhang, Huabing Li, Hao Feng, Lili Tan, Ke Yang. A novel biodegradable high nitrogen iron alloy with simultaneous enhancement of corrosion rate and local corrosion resistance[J]. J. Mater. Sci. Technol., 2023, 152: 94-99.

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