Effect of Phytic Acid Modification on Characteristics of MAO Coating on TC4 Titanium Alloy

doi:10.12442/j.issn.1002-185X.20230376

Home > Archive>Volume 53, Issue 4, 2024 >954-962. DOI:10.12442/j.issn.1002-185X.20230376

Effect of Phytic Acid Modification on Characteristics of MAO Coating on TC4 Titanium Alloy
DOI:
                        10.12442/j.issn.1002-185X.20230376
                    
Author:
                        Lan Xinyue1,2Lan Xinyue
State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua 617000, China;School of New Engineering and Materials, Southwest Petroleum University, Chengdu 610500, China
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Wang Ping1,2Wang Ping
State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua 617000, China;School of New Engineering and Materials, Southwest Petroleum University, Chengdu 610500, China
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Gong Zeyu1,2Gong Zeyu
State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua 617000, China;School of New Engineering and Materials, Southwest Petroleum University, Chengdu 610500, China
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Luo Xu1Luo Xu
State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua 617000, China
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Zheng Youping1Zheng Youping
State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua 617000, China
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Deng Bowen3Deng Bowen
Institute of Chemistry, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
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Affiliation:1.State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua 617000, China;2.School of New Engineering and Materials, Southwest Petroleum University, Chengdu 610500, China;3.Institute of Chemistry, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
Clc Number:
Fund Project:Open Fund of State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization (2022P4FZG08A); Sichuan Science and Technology Program (2022YFSY0018)

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Abstract:

Phytic acid, one kind of organic acid, was added into the electrolyte to enhance the corrosion performance and thermal stability of micro-arc oxidation (MAO) coating on TC4 titanium alloy. The effect of phytic acid on the coating formation, morphology, and performance was analyzed by scanning electron microscope, X-ray diffractometer, X-ray photoelectron spectroscope, and thermal shock experiments. Results show that the addition of phytic acid leads to the refinement of discharge microholes and improves the formation efficiency and phase structure of MAO coating. Through potentiodynamic polarization tests, it is found that adding phytic acid can significantly enhance the corrosion resistance of MAO coating. The corrosion current density decreases from 8.406×10^-5 A·cm^-2 to 2.580×10^-6 A·cm^-2 when the phytic acid concentration in electrolyte changes to 12 mL/L (optimal phytic acid concentration). Cyclic high temperature oxidation test results indicate that the thermal shock resistance and high temperature oxidation resistance of TC4 alloy are enhanced.

Key words:TC4 titanium alloy;MAO;corrosion resistance;thermal shock resistance

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[Lan Xinyue, Wang Ping, Gong Zeyu, Luo Xu, Zheng Youping, Deng Bowen. Effect of Phytic Acid Modification on Characteristics of MAO Coating on TC4 Titanium Alloy[J]. Rare Metal Materials and Engineering,2024,53(4):954~962.]
DOI：10.12442/j. issn.1002-185X.20230376

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Received:June 13,2023
Revised:November 22,2023
Adopted:December 18,2023
Online: April 23,2024
Published: April 23,2024

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