A percolation theory for designing corrosion-resistant alloys
A percolation theory for designing corrosion-resistant alloys
复制标题
DOI：
10.1038/s41563-021-00920-9
复制
发表时间：
2021-02
期刊：
影响因子：
41.2
通讯作者：
Yusi Xie;D. Artymowicz;P. Lopes;Ashlee Aiello;Duo Wang;J. Hart;E. Anber;M. Taheri;H. Zhuang;R. Newman;K. Sieradzki
中科院分区：
文献类型：
--
作者：
Yusi Xie;D. Artymowicz;P. Lopes;Ashlee Aiello;Duo Wang;J. Hart;E. Anber;M. Taheri;H. Zhuang;R. Newman;K. Sieradzki
由于存在纳米厚的保护性钝化氧化膜，含有足够量的铬的铁铬和镍铬二元合金作为典型的耐腐蚀金属。如果该膜受到划痕或磨损的损害，它会在几乎没有伴随金属溶解的情况下重新形成，这是良好被动行为的关键标准。这是不锈钢和其他含铬合金用于从生物医学植入物到核反应堆组件等关键应用的主要原因。揭示这种电化学行为的成分依赖性是腐蚀科学中一个长期悬而未决的问题。在这里，我们开发了一个渗流理论的合金钝化的基础上，二维到三维的交叉效应，占选择性溶解和钝化膜形成的初始阶段溶解的金属的量。我们验证了这一理论的实验和动力学Monte Carlo模拟。我们的研究结果揭示了耐腐蚀金属合金的设计前进的道路。
Iron–chromium and nickel–chromium binary alloys containing sufficient quantities of chromium serve as the prototypical corrosion-resistant metals owing to the presence of a nanometre-thick protective passive oxide film, , , , , , –. Should this film be compromised by a scratch or abrasive wear, it reforms with little accompanying metal dissolution, a key criterion for good passive behaviour. This is a principal reason that stainless steels and other chromium-containing alloys are used in critical applications ranging from biomedical implants to nuclear reactor components,. Unravelling the compositional dependence of this electrochemical behaviour is a long-standing unanswered question in corrosion science. Herein, we develop a percolation theory of alloy passivation based on two-dimensional to three-dimensional crossover effects that accounts for selective dissolution and the quantity of metal dissolved during the initial stage of passive film formation. We validate this theory both experimentally and by kinetic Monte Carlo simulation. Our results reveal a path forward for the design of corrosion-resistant metallic alloys.