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<p>Currently, SLM CoCrMo superalloy internal flow channels with micro-fine large aspect ratio produced by SLM technology are widely used in automotive, marine, and aerospace industries due to their excellent corrosion resistance, high-temperature resistance, and mechanical properties. However, eliminating surface defects has always been a major challenge in the industry. Therefore, this paper analyzes the changes of microstructure, surface roughness, and corrosion resistance on the surface of SLM CoCrMo high-temperature alloy micro-complex internal runners before and after chemical polishing by chemically polishing the micro-complex internal runners of SLM CoCrMo high-temperature alloy in order to improve its bright rectification, and researches the mechanism of chemical polishing of micro-complex internal runners of SLM CoCrMo high-temperature alloy before and after chemical polishing. The results show that chemical polishing can significantly remove the defects such as adhered powder and unformed particles on the flow channel surface produced by the SLM additive manufacturing process. The higher the surface roughness, the higher the removal efficiency. The surface roughness of the alloy flow channel is reduced from 7.4, 10.9, 13.46&#xa0;μm to 2.673, 2.888, 3.188&#xa0;μm, and the surface finish is greatly improved. After chemical polishing, the corrosion resistance of the flow channel are significantly improved. The polishing mechanism shows that in the CrCoMo high-temperature alloy-nitric acid system, chemical polishing establishes a dynamic reaction process involving oxidation, corrosion, and dissolution. </p>

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Study on the Influence of Chemical Polishing on the Micro-Complex Flow Channels of SLM CoCrMo Superalloys with Different Surface Microstructure

  • 期刊论文

  • 发表日期：

    2025年7月14日

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  • Baichuan Wang,
  • Juan Hao,
  • Tianjian Mi,
  • Yuzhou Du,
  • Manzhou Yang,
  • Qianxiang Fei,
  • Donghong Wang,
  • Chao Yang,
  • Dan Dong

摘要

Currently, SLM CoCrMo superalloy internal flow channels with micro-fine large aspect ratio produced by SLM technology are widely used in automotive, marine, and aerospace industries due to their excellent corrosion resistance, high-temperature resistance, and mechanical properties. However, eliminating surface defects has always been a major challenge in the industry. Therefore, this paper analyzes the changes of microstructure, surface roughness, and corrosion resistance on the surface of SLM CoCrMo high-temperature alloy micro-complex internal runners before and after chemical polishing by chemically polishing the micro-complex internal runners of SLM CoCrMo high-temperature alloy in order to improve its bright rectification, and researches the mechanism of chemical polishing of micro-complex internal runners of SLM CoCrMo high-temperature alloy before and after chemical polishing. The results show that chemical polishing can significantly remove the defects such as adhered powder and unformed particles on the flow channel surface produced by the SLM additive manufacturing process. The higher the surface roughness, the higher the removal efficiency. The surface roughness of the alloy flow channel is reduced from 7.4, 10.9, 13.46 μm to 2.673, 2.888, 3.188 μm, and the surface finish is greatly improved. After chemical polishing, the corrosion resistance of the flow channel are significantly improved. The polishing mechanism shows that in the CrCoMo high-temperature alloy-nitric acid system, chemical polishing establishes a dynamic reaction process involving oxidation, corrosion, and dissolution.