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<p>Titanium alloys are generally used in petroleum industry due to their excellent properties of surface coatings. In this work, the micro-arc oxidation (MAO) coatings doped with different amounts of YbCl<sub>3</sub> were prepared on the Ti-3Al-2.5&#xa0;V alloys to protect the substrate from corrosion. The microstructure, phase composition and corrosion resistance of the coatings were characterized by SEM, EDS, XRD and electrochemical experiments, respectively. The results showed that the main compositions of the coating were TiO<sub>2</sub>, Yb<sub>2</sub>O<sub>3</sub> and SiO<sub>2</sub>, and the discharge micro-pores and abrasion resistance of the coatings were improved. When YbCl<sub>3</sub> was added at 0.15&#xa0;g/L, the friction coefficient was lower than that of the substrate and other YbCl<sub>3</sub> contents, and the corrosion rate decreased to the minimum value of 3.89 × 10<sup>−2</sup> mpy, indicating that the corrosion resistance was the best. In addition, from the erosion–corrosion test, the coatings could provide effective protection for the matrix during the scouring process. The comprehensive properties of the MAO coatings are improved after adding YbCl<sub>3</sub>, which provides an effective guide for the widespread application of Ti-3Al-2.5&#xa0;V alloys in the field of oil and gas wells.</p>

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Effect of YbCl3 Concentrations on Characteristics of Micro-Arc Oxidation Coatings Formed on Ti-3Al-2.5V Alloys

  • 期刊论文

  • 发表日期：

    2025年4月24日

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  • Qiming Luo,
  • Zhao Yang,
  • Ping Wang,
  • Manlan Zhu,
  • Fengyu Sun

摘要

Titanium alloys are generally used in petroleum industry due to their excellent properties of surface coatings. In this work, the micro-arc oxidation (MAO) coatings doped with different amounts of YbCl3 were prepared on the Ti-3Al-2.5 V alloys to protect the substrate from corrosion. The microstructure, phase composition and corrosion resistance of the coatings were characterized by SEM, EDS, XRD and electrochemical experiments, respectively. The results showed that the main compositions of the coating were TiO2, Yb2O3 and SiO2, and the discharge micro-pores and abrasion resistance of the coatings were improved. When YbCl3 was added at 0.15 g/L, the friction coefficient was lower than that of the substrate and other YbCl3 contents, and the corrosion rate decreased to the minimum value of 3.89 × 10−2 mpy, indicating that the corrosion resistance was the best. In addition, from the erosion–corrosion test, the coatings could provide effective protection for the matrix during the scouring process. The comprehensive properties of the MAO coatings are improved after adding YbCl3, which provides an effective guide for the widespread application of Ti-3Al-2.5 V alloys in the field of oil and gas wells.