Scholarlink

<p>This study explores the corrosion behavior of cast AZ92 magnesium alloy modified with 0–3.0&#xa0;wt% Y<sub>2</sub>O<sub>3</sub> produced by a stir casting process in 3.5% NaCl solution, both with and without inhibitors 0.01&#xa0;mg/L AgNO<sub>3</sub>, 0.01&#xa0;mg/L Ce(NO<sub>3</sub>)<sub>3</sub>, and 0.01&#xa0;mg/L Mo(NO<sub>3</sub>)<sub>2</sub>. A novel approach combining gravimetric analysis, electrochemical techniques (EIS, polarization), and response surface methodology (RSM) was used to optimize corrosion resistance (CRST). Results reveal that 2.5&#xa0;wt% Y<sub>2</sub>O<sub>3</sub> provides the lowest corrosion rate (0.80&#xa0;mm/y) when Ce(NO<sub>3</sub>)<sub>3</sub> present, which is attributed to refinement of β-phase. SEM confirmed compact Mg(OH)<sub>2</sub>-rich surface films, while RSM identified Y<sub>2</sub>O<sub>3</sub> content as the most influential factor (<i>F</i> = 531.18, <i>p</i> = 0.000), followed by time and media. Electrochemical tests showed enhanced polarization resistance (up to 1901.7&#xa0;Ω) and stable passive films at 1.5–2.5&#xa0;wt% Y<sub>2</sub>O<sub>3</sub>. However, higher Y<sub>2</sub>O<sub>3</sub> levels reduced protection due to film instability and agglomeration. The synergistic role of Y<sub>2</sub>O<sub>3</sub> and Ce(NO<sub>3</sub>)<sub>3</sub> was most effective, with optimal conditions predicted by RSM. These findings provide a promising corrosion control strategy using rare earth oxides and multivariate optimization.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Synergistic inhibition and assessment of Y2O3 corrosion impact on AZ92 magnesium alloy by stir casting process in chloride media by response surface methodology

  • 期刊论文

  • 发表日期：

    2025年8月20日

查看全文
  • Lamiaa Z. Mohamed,
  • Shimaa El-Hadad,
  • M. E. Moussa,
  • Ghalia A. Gaber

摘要

This study explores the corrosion behavior of cast AZ92 magnesium alloy modified with 0–3.0 wt% Y2O3 produced by a stir casting process in 3.5% NaCl solution, both with and without inhibitors 0.01 mg/L AgNO3, 0.01 mg/L Ce(NO3)3, and 0.01 mg/L Mo(NO3)2. A novel approach combining gravimetric analysis, electrochemical techniques (EIS, polarization), and response surface methodology (RSM) was used to optimize corrosion resistance (CRST). Results reveal that 2.5 wt% Y2O3 provides the lowest corrosion rate (0.80 mm/y) when Ce(NO3)3 present, which is attributed to refinement of β-phase. SEM confirmed compact Mg(OH)2-rich surface films, while RSM identified Y2O3 content as the most influential factor (F = 531.18, p = 0.000), followed by time and media. Electrochemical tests showed enhanced polarization resistance (up to 1901.7 Ω) and stable passive films at 1.5–2.5 wt% Y2O3. However, higher Y2O3 levels reduced protection due to film instability and agglomeration. The synergistic role of Y2O3 and Ce(NO3)3 was most effective, with optimal conditions predicted by RSM. These findings provide a promising corrosion control strategy using rare earth oxides and multivariate optimization.