Abstract

In this study, the coating of Ni–Ni₃Si nanocomposite was produced in-situ on plain carbon steel using spark plasma sintering process of Ni and Si powders followed by heat treatment. Increasing Si content in the powders from 6 to 13 wt% increased the amount of Si in the coatings (from 5.1 to 11.8 wt%). The corrosion behavior of the coated samples in 1 M sulfuric acid solution was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy techniques. In the 13 wt% Si coating, the eutectic structure consisting of the Ni and Ni₃Si phases was observed to be uniformly distributed. Ni₃Si nanoparticles with an approximate size of 90 nm were obtained in the coating by heat treatment. The results showed that passive behavior is obtained by heat treatment due to the uniform distribution of Ni₃Si nanoparticles and also the uniform diffusion of silicon into the nickel phase. The excellent passivation results in the highest corrosion resistance in 13 wt%Si coating after the heat treatment.

Graphic Abstract

中文翻译：

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利用火花等离子体烧结和随后的热处理原位形成耐腐蚀性能极高的Ni-Ni 3 Si纳米复合涂层

摘要

在这项研究中，Ni-Ni ₃ Si纳米复合材料的涂层是通过使用Ni和Si粉末的火花等离子体烧结工艺，然后进行热处理，在普通碳钢上原位制备的。粉末中的Si含量从6到13重量％增加会增加涂层中的Si含量（从5.1到11.8 wt％）。通过电位动力学极化和电化学阻抗谱技术研究了涂层样品在1 M硫酸溶液中的腐蚀行为。在13wt％的Si涂层中，观察到由Ni和Ni ₃ Si相组成的共晶结构均匀分布。镍₃通过热处理在涂层中获得约90nm尺寸的Si纳米颗粒。结果表明，由于Ni ₃ Si纳米颗粒的均匀分布以及硅向镍相的均匀扩散，通过热处理获得了被动行为。优异的钝化作用使热处理后的13 wt％Si涂层具有最高的耐腐蚀性。

图形摘要