Effect of Sn and Mn Composite Addition on Microstructure and Properties of Micro-arc Oxidation Coating on AZ21 Alloy

doi:10.12442/j.issn.1002-185X.20240304

Home > Archive>Volume 54, Issue 1, 2025 >171-183. DOI:10.12442/j.issn.1002-185X.20240304

Effect of Sn and Mn Composite Addition on Microstructure and Properties of Micro-arc Oxidation Coating on AZ21 Alloy
DOI:
                        10.12442/j.issn.1002-185X.20240304
                    
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                        Gao Fuhao1Gao Fuhao
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China
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Lv Binjiang1,2Lv Binjiang
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China;Key Lab of Industrial Fluid Energy Conservation and Pollution Control, Ministry of Education,Qingdao University of Technology, Qingdao 266520, China
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Guo Feng1,2Guo Feng
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China;Key Lab of Industrial Fluid Energy Conservation and Pollution Control, Ministry of Education,Qingdao University of Technology, Qingdao 266520, China
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Cui Ning1Cui Ning
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China
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Xu Tiewei1Xu Tiewei
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China
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Affiliation:1.School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China;2.Key Lab of Industrial Fluid Energy Conservation and Pollution Control, Ministry of Education,Qingdao University of Technology, Qingdao 266520, China
Clc Number:TG174.4;TG146.22
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Abstract:

The effects of low-cost Sn (1wt%) and Mn (0.5wt%) composite addition on the microstructure and properties of micro-arc oxidation coatings on extruded Mg-2Al-Zn (AZ21) alloy were studied. After the addition of Sn and Mn elements to the substrate, the phase composition of the coatings remains unchanged, mainly consisting of MgO, MgAl₂O₄ and AlPO₄ phases. The thickness and porosity of the coatings increase slightly, the thickness increases from 8.49 μm to 9.60 μm, and the porosity increases from 5.05% to 5.75%. The wear resistance and corrosion resistance of the substrates and coatings were evaluated by dry friction and wear test, immersion test and potentiodynamic polarization test. The results show that the micro-arc oxidation coating significantly improves the wear resistance and corrosion resistance of the substrate. The composite addition of Sn and Mn improves the wear resistance of the coatings, but their corrosion resistance decreases. The wear rate of the coating decreases from 3.53×10^-5 mm³·(N·m)^-1 to 2.993×10^-5 mm³·(N·m)^-1. The corrosion current density of the coating increases from 3.14×10^-6 A·cm^-2 to 4.18×10^-6 A·cm^-2.

Key words:micro-arc oxidation coating;Sn and Mn composite addition;wear resistance;corrosion resistance

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[Gao Fuhao, Lv Binjiang, Guo Feng, Cui Ning, Xu Tiewei. Effect of Sn and Mn Composite Addition on Microstructure and Properties of Micro-arc Oxidation Coating on AZ21 Alloy[J]. Rare Metal Materials and Engineering,2025,54(1):171~183.]
DOI：10.12442/j. issn.1002-185X.20240304

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Received:May 21,2024
Revised:July 15,2024
Adopted:August 06,2024
Online: January 24,2025
Published: January 20,2025

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