Effect of SiO<sub>2</sub> Nanoparticles/Silicate on Characteristics of Micro-arc Oxidation Coating Formed on TC4 Alloy

doi:10.12442/j.issn.1002-185X.20240394

Home > Archive>Volume 54, Issue 1, 2025 >76-83. DOI:10.12442/j.issn.1002-185X.20240394

Effect of SiO2 Nanoparticles/Silicate on Characteristics of Micro-arc Oxidation Coating Formed on TC4 Alloy
DOI:
                        10.12442/j.issn.1002-185X.20240394
                    
Author:
                        Sun Fengyu1Sun Fengyu
School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China
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Yang Zhao1Yang Zhao
School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China
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Hu Jie2Hu Jie
State Key Laboratory of Low-carbon Smart Coal-fired Power Generation and Ultra-clean Emission, Nanjing 210046, China
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Gong Yunbai1Gong Yunbai
School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China
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Wang Ping1Wang Ping
School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China
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Luo Qiming1Luo Qiming
School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China
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Zhu Manlan1Zhu Manlan
School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China
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Affiliation:1.School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China;2.State Key Laboratory of Low-carbon Smart Coal-fired Power Generation and Ultra-clean Emission, Nanjing 210046, China
Clc Number:
Fund Project:Sichuan Science and Technology Program (2022YFSY0018)

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Abstract:

TC4 micro-arc oxidation (MAO) coatings were prepared by adding SiO₂ nanoparticles or sodium silicate to the sodium meta-aluminate-based electrolyte. The effect of additives was investigated by XRD, SEM, EDS, electrochemical and wear tests. The results show that additives can considerably accelerate the formation of MAO coatings. The coatings are mostly composed of rutile and anatase TiO₂, α-Al₂O₃, γ-Al₂O₃, Al₂TiO₅ and SiO₂. Sodium silicate and SiO₂ nanoparticles added to the coating can effectively reduce the size of micropores and increase its thickness, whereas SiO₂ nanoparticles with superior physical properties can be directly deposited at the discharge channel, significantly increasing the coating's resistance to wear and corrosion. The coating with SiO₂ nanoparticles exhibits the best overall performance, with the lowest corrosion rate and average friction coefficient of 4.095×10^-5 mm/a and 0.30, respectively.

Key words:micro-arc oxidation;TC4 alloy;coatings;corrosion;wear

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[Sun Fengyu, Yang Zhao, Hu Jie, Gong Yunbai, Wang Ping, Luo Qiming, Zhu Manlan. Effect of SiO₂ Nanoparticles/Silicate on Characteristics of Micro-arc Oxidation Coating Formed on TC4 Alloy[J]. Rare Metal Materials and Engineering,2025,54(1):76~83.]
DOI：10.12442/j. issn.1002-185X.20240394

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Received:July 01,2024
Revised:December 20,2024
Adopted:December 03,2024
Online: January 24,2025
Published: January 20,2025

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