Microstructure and Corrosion Behavior of Duplex CrON Coatings in Molten Aluminum

doi:10.12442/j.issn.1002-185X.20200302

Home > Archive>Volume 50, Issue 5, 2021 >1523-1530. DOI:10.12442/j.issn.1002-185X.20200302

Microstructure and Corrosion Behavior of Duplex CrON Coatings in Molten Aluminum
DOI:
                        10.12442/j.issn.1002-185X.20200302
                    
Author:
                        Farooq Ahmad1,2,3Farooq Ahmad
Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials (Anhui University of Technology), Ministry of Education, Maanshan 243002, China;Research Center of Modern Surface & Interface Engineering, Anhui University of Technology, Maanshan 243002, China;School of Materials Science and Engineering, Anhui University of Technology, Maanshan 243002, China
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Zhang Lin1,2Zhang Lin
Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials (Anhui University of Technology), Ministry of Education, Maanshan 243002, China;Research Center of Modern Surface & Interface Engineering, Anhui University of Technology, Maanshan 243002, China
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Zheng Jun1,2,3Zheng Jun
Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials (Anhui University of Technology), Ministry of Education, Maanshan 243002, China;Research Center of Modern Surface & Interface Engineering, Anhui University of Technology, Maanshan 243002, China;School of Materials Science and Engineering, Anhui University of Technology, Maanshan 243002, China
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Iram Sidra1,2,3Iram Sidra
Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials (Anhui University of Technology), Ministry of Education, Maanshan 243002, China;Research Center of Modern Surface & Interface Engineering, Anhui University of Technology, Maanshan 243002, China;School of Materials Science and Engineering, Anhui University of Technology, Maanshan 243002, China
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Zhang Shihong1,2,3Zhang Shihong
Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials (Anhui University of Technology), Ministry of Education, Maanshan 243002, China;Research Center of Modern Surface & Interface Engineering, Anhui University of Technology, Maanshan 243002, China;School of Materials Science and Engineering, Anhui University of Technology, Maanshan 243002, China
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Affiliation:1.Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials (Anhui University of Technology), Ministry of Education, Maanshan 243002, China;2.Research Center of Modern Surface & Interface Engineering, Anhui University of Technology, Maanshan 243002, China;3.School of Materials Science and Engineering, Anhui University of Technology, Maanshan 243002, China
Clc Number:
Fund Project:Anhui Provincial Natural Science Foundation (2008085QE202); Anhui Provincial Key Research and Development Program (202004h07020020, 202004b11020011); Xijiang Innovation Team Project Funding of Zhaoqing

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Abstract:

The duplex CrON coatings were prepared on H13 tool steels by combination of plasma nitriding and arc ion plating. The effects of oxygen flow rate on microstructure and corrosion behavior of duplex CrON coating in the molten aluminum were investigated. Results show that the as-deposited coatings with oxygen flow rate of 0, 50, and 100 mL/min, namely CrON-0, CrON-50, and CrON-100 coatings, mainly consist of B1-CrN phase. The major components of CrON coating change from nitride into oxide phase with increasing the oxygen flow rate, and the Cr₂O₃ crystalline phase is obviously observed in the as-deposited coatings with oxygen flow rate of 200 mL/min, namely CrON-200 coating. Oxygen addition in nitride restrains the columnar growth of grains resulting in the dense microstructure. The surface defects and roughness increase with the increase of oxygen content. The failure behavior of duplex CrON coatings is mainly corrosion pitting in molten aluminium. The CrON-50 coating reveals the best corrosion resistance due to the dense columnar microstructure and high thermal stability. The dense Cr₂O₃ layer in CrON-200 coating is also favourable for corrosion protection against the molten aluminum.

Key words:CrON;duplex coating;microstructure;immersion corrosion;molten aluminum

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[Farooq Ahmad, Zhang Lin, Zheng Jun, Iram Sidra, Zhang Shihong. Microstructure and Corrosion Behavior of Duplex CrON Coatings in Molten Aluminum[J]. Rare Metal Materials and Engineering,2021,50(5):1523~1530.]
DOI：10.12442/j. issn.1002-185X.20200302

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Received:May 09,2020
Revised:July 15,2020
Adopted:July 20,2020
Online: July 19,2021
Published: May 25,2021

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