钝化
材料科学
腐蚀
阳极
极化(电化学)
电解
冶金
电极
图层(电子)
饱和甘汞电极
化学工程
电化学
复合材料
化学
参比电极
物理化学
电解质
工程类
作者
Kaiping Yu,Shihui Feng,Chao Ding,Meng Gu,Peng Yu,Mingxin Huang
标识
DOI:10.1016/j.mattod.2023.07.022
摘要
Stainless steel is critical material used in a wide variety of industries. Unfortunately, current development of stainless steel has reached a stagnant stage due to the fundamental limitation of the conventional Cr-based single-passivation mechanism. Here, we show that, by using a sequential dual-passivation mechanism, substantially enhanced anti-corrosion properties can be achieved in Mn-contained stainless steel, with a high breakdown potential of ∼1700 mV (saturated calomel electrode, SCE) in a 3.5 wt% NaCl solution. Specifically, the conventional Cr-based and counter-intuitive Mn-based passivation is sequentially activated during potentiodynamic polarization. The Cr-based passive layer prevents corrosion at low potentials below ∼720 mV(SCE), while the Mn-based passive layer resists corrosion at high potentials up to ∼1700 mV(SCE). The present “sequential dual-passivation” strategy enlarges the passive region of stainless steel to high potentials above water oxidation, enabling them as potential anodic materials for green hydrogen production via water electrolysis.
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