Effect of Phosphorus Content and Heat Treatment Temperature on Microstructure and Corrosion Resistance of Ni–(X)P–GO Nanocomposite Coating on AZ31D Alloy

被引：0

作者：

Hanachi M. ^{[1
]}

Seyedraoufi Z.S. ^{[1
]}

Samiee M. ^{[1
]}

Shajari Y. ^{[2
]}

机构：

[1] Department of Metallurgy and Materials Engineering, Karaj Branch, Islamic Azad University, Karaj

[2] Materials and Energy Research Center, Karaj

来源：

Journal of Bio- and Tribo-Corrosion | 2021年 / 7卷 / 01期

关键词：

Corrosion; Heat treatment; Microstructure; Nanocomposite; Ni–P–Go;

D O I：

10.1007/s40735-020-00468-2

中图分类号：

学科分类号：

摘要：

In the present study, a nanocomposite coating of nickel–Phosphor–graphene nano-oxide with three different phosphor content was applied on the surface of AZ31D magnesium-based alloy by the use of electroless method. Structural studies by scanning electron microscope (SEM) and X-ray diffraction (XRD) showed that a coating with a semi-amorphous structure and a cauliflower morphology is formed on the substrate surface. This is in such a way that as the phosphor content of the coating increases along with the crystallinity of the coating, GO absorption increases up to 4.5%. The obtained coatings are heat treated in argon-gas shielding atmosphere at three different temperatures of 300 °C, 400 °C, and 500 °C for 1 h. SEM results showed that by annealing, the cauliflower morphology of the coating is omitted. By heat treatment, all of the coatings were crystallized and Ni2P and Ni3P intermetallic compounds appeared in the structure in such a way that as heat treatment temperature increased, Ni2P transformed to Ni3P. By increasing heat treatment temperature and phosphor content, suitable conditions were provided for the precipitation of Ni5P2 and Ni8P3 unstable phases. Polarization corrosion test results showed that coating results in higher corrosion resistance in the substrate; as the phosphor content of the coating increases, corrosion resistance is improved. Moreover, the increase in the heat treatment temperature enhances the decreasing trend in corrosion resistance. However, corrosion resistance of the coating is higher than that of the substrate. © 2021, The Author(s), under exclusive licence to Springer Nature Switzerland AG part of Springer Nature.

引用

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