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<p>This paper presents a comparative study on the corrosion processes and mechanisms of Inconel 625 and NiCrMoAl alloys under KCl-ZnCl<sub>2</sub> salt deposits at 450&#xa0;°C. The results indicate that after 80&#xa0;h of corrosion at 450&#xa0;°C under KCl-ZnCl<sub>2</sub> salt deposits, the weight loss of NiCrMoAl alloy decreased by 74.66% compared to that of Inconel 625 alloy. The corrosion kinetics of the two alloys show that the corrosion rate of Inconel 625 increases from an initial linear stage of 0.47&#xa0;mg/(cm<sup>2</sup>&#xa0;h) to a later linear stage of 0.79&#xa0;mg/(cm<sup>2</sup>&#xa0;h), primarily due to the preferential dissolution of Cr, which induces cracks and promotes further penetration of the corrosive medium. In contrast, NiCrMoAl exhibits a transition from a parabolic stage following <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\Delta {\text{m }} = \sqrt t\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi mathvariant="normal">Δ</mi> <mrow> <mtext>m</mtext> <mspace width="0.333333em" /> </mrow> <mo>=</mo> <msqrt> <mi>t</mi> </msqrt> </mrow> </math></EquationSource> </InlineEquation> to a linear stage with a corrosion rate of 0.19&#xa0;mg/(cm<sup>2</sup>&#xa0;h). This behavior is attributed to the initial effective inhibition of corrosion by the <i>α</i>-Mo phase. However, with prolonged exposure, the <i>β</i>-NiAl phase transforms into the <i>γ</i>-Ni phase due to preferential dissolution of aluminum. This process disrupts the internal structure of the alloy, facilitating inward diffusion of the corrosive medium and accelerating alloy degradation.</p>

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Hot Corrosion of Inconel 625 and NiCrMoAl Alloys Beneath Deposits of Molten KCl-55%ZnCl2 at 450 °C in Air

  • 期刊论文

  • 发表日期：

    2025年10月29日

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  • Hailiang Zhang,
  • Jiangtao Wu

摘要

This paper presents a comparative study on the corrosion processes and mechanisms of Inconel 625 and NiCrMoAl alloys under KCl-ZnCl2 salt deposits at 450 °C. The results indicate that after 80 h of corrosion at 450 °C under KCl-ZnCl2 salt deposits, the weight loss of NiCrMoAl alloy decreased by 74.66% compared to that of Inconel 625 alloy. The corrosion kinetics of the two alloys show that the corrosion rate of Inconel 625 increases from an initial linear stage of 0.47 mg/(cm2 h) to a later linear stage of 0.79 mg/(cm2 h), primarily due to the preferential dissolution of Cr, which induces cracks and promotes further penetration of the corrosive medium. In contrast, NiCrMoAl exhibits a transition from a parabolic stage following \(\Delta {\text{m }} = \sqrt t\) Δ m = t to a linear stage with a corrosion rate of 0.19 mg/(cm2 h). This behavior is attributed to the initial effective inhibition of corrosion by the α-Mo phase. However, with prolonged exposure, the β-NiAl phase transforms into the γ-Ni phase due to preferential dissolution of aluminum. This process disrupts the internal structure of the alloy, facilitating inward diffusion of the corrosive medium and accelerating alloy degradation.