Alloying trace Sn in 430LX ferrite stainless steel (FSS) can effectively inhibit the active dissolution kinetics in H₂SO₄ solution, which is proved by potentiodynamic and potentiostatic polarization. To clarify the mechanism of Sn and unravel the complicated polarization curves, solution simulation experiments for 0 Sn specimen were designed and Sn²⁺ dynamic addition tests were conducted. Results indicate that the inhibition effect of Sn is not only related to Sn²⁺ concentration but also affected by the polarization potential. Based on under-potential deposition, the inhibition mechanism of Sn can be well explained and the corrosion process of tin-containing FSS is clearly described.

在 430LX 铁素体不锈钢 (FSS) 中合金化痕量 Sn 可以有效抑制 H ₂ SO ₄溶液中的主动溶解动力学，动电位和恒电位极化证明了这一点。为阐明Sn的作用机理，解开复杂的极化曲线，设计了0 Sn试样的溶液模拟实验，并进行了Sn ²⁺动态添加试验。结果表明，Sn的抑制作用不仅与Sn ²⁺浓度有关，而且还受极化电位的影响。基于欠电位沉积，可以很好地解释Sn的抑制机制，并清楚地描述含锡FSS的腐蚀过程。