2101 duplex stainless steel with low Ni content is developed to replace austenitic stainless steel in many corrosive environments. Herein, the effects of Ce addition on the microstructure and corrosion resistance of 2101 duplex stainless steel are studied. The electrochemical corrosion behavior of 2101 duplex stainless steel with Ce contents of 0, 0.005, and 0.020 wt% is studied in 3.5 wt% NaCl solution and 0.05 mol L⁻¹ H₂SO₄ + 0.05 mol L⁻¹ KSCN solution at 25 °C. The situation is evaluated in 6 wt% FeCl₃ solution at 35 °C. The results show that with increasing Ce content, the proportion of α phase in 2101 duplex stainless steel decreases, whereas the proportion of γ phase increases. At 0.005 wt% Ce, the two-phase ratio is close to 1:1. Moreover, the partition coefficient (K) of elements gradually approaches 1 with increasing Ce, indicating a more uniform element distribution between the two phases. The electrochemical experiments in simulated seawater and acidic environments show that Ce addition gradually increases the corrosion potential and pitting resistance, leading to the formation of more stable passivation film.

中文翻译：

---

Ce添加量对2101双相不锈钢组织和耐蚀性的影响

低Ni含量的2101双相不锈钢是为了在许多腐蚀环境中替代奥氏体不锈钢而开发的。本文研究了Ce添加量对2101双相不锈钢显微组织和耐蚀性的影响。研究了Ce含量分别为0、0.005和0.020 wt%的2101双相不锈钢在3.5 wt% NaCl溶液和0.05 mol L ^-1 H ₂ SO ₄  + 0.05 mol L ^-1 KSCN溶液中25°的电化学腐蚀行为C。情况在 6 wt% FeCl _{3 中}进行评估35°C 下的溶液。结果表明，随着Ce含量的增加，2101双相不锈钢中α相的比例减少，而γ相的比例增加。在 0.005 wt% Ce 时，两相比接近 1:1。此外，随着 Ce 的增加，元素的分配系数 ( K ) 逐渐接近 1，表明两相之间的元素分布更均匀。在模拟海水和酸性环境中的电化学实验表明，Ce的添加逐渐提高了腐蚀电位和抗点蚀能力，导致形成更稳定的钝化膜。