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<p>316L stainless steel (SS) is commonly used as tank material and electrodes for methanesulfonic acid (MSA) leaching of spent lead paste (SLP). However, due to the presence of numerous defects and deleterious phases in wrought 316L SS, it is prone to corrosion in MSA, which may lead to energy inefficiency and compromise the purity of lead during the recycling process. To address corrosion-related risks and economic impacts, this study investigated the corrosion behavior of 316L SS fabricated via laser powder bed fusion (LPBF) in simulated SLP solutions, with comparative analysis against conventional wrought counterparts. Potentiodynamic polarization curves showed that LPBF-316L SS had a more negative corrosion potential, lower corrosion current, and better pitting corrosion resistance. LPBF-316L SS can sustain stability in the simulated solution for a prolonged duration. The growth mechanism of the LPBF-316LSS passive film was elucidated through the application of Mott–Schottky (M–S) tests and point defect model (PDM). During LPBF process, the uniquely formed cellular microstructures, uneven elemental distribution, and fewer detrimental secondary phases collectively contribute to the formation of a denser passive film and accelerated growth kinetics for LPBF-316L SS in the simulated solution.</p>

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Investigation on the Corrosion Behavior of 316L SS Manufactured by Laser Powder Bed Fusion in Simulated Spent Lead Paste Leach Solution

  • 期刊论文

  • 发表日期：

    2026年6月18日

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  • Keyi Li,
  • Yunlong Bai,
  • Wei Wang,
  • Feng Xie,
  • Heng Liu

摘要

316L stainless steel (SS) is commonly used as tank material and electrodes for methanesulfonic acid (MSA) leaching of spent lead paste (SLP). However, due to the presence of numerous defects and deleterious phases in wrought 316L SS, it is prone to corrosion in MSA, which may lead to energy inefficiency and compromise the purity of lead during the recycling process. To address corrosion-related risks and economic impacts, this study investigated the corrosion behavior of 316L SS fabricated via laser powder bed fusion (LPBF) in simulated SLP solutions, with comparative analysis against conventional wrought counterparts. Potentiodynamic polarization curves showed that LPBF-316L SS had a more negative corrosion potential, lower corrosion current, and better pitting corrosion resistance. LPBF-316L SS can sustain stability in the simulated solution for a prolonged duration. The growth mechanism of the LPBF-316LSS passive film was elucidated through the application of Mott–Schottky (M–S) tests and point defect model (PDM). During LPBF process, the uniquely formed cellular microstructures, uneven elemental distribution, and fewer detrimental secondary phases collectively contribute to the formation of a denser passive film and accelerated growth kinetics for LPBF-316L SS in the simulated solution.