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Abstract <p>VZh718 alloy, an analogue of the foreign heat-resistant alloy Inconel IN718, was tested for its tendency to corrosion in NaCl, Na<sub>2</sub>SO<sub>4</sub> + NaCl, Na<sub>2</sub>SO<sub>4</sub> + K<sub>2</sub>SO<sub>4</sub> environments at temperatures of 700 and 850°C. It was found that in the absence of chlorides, VZh718 alloy has a high resistance to hot corrosion. The determining role of chlorides in the mechanism of high-temperature corrosion of VZh718 alloy is shown. The presence of sulfates, depending on the temperature, can lead to both a slowdown in chloride-induced corrosion processes and, conversely, significantly accelerate them.</p>

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Influence of Chlorides on High-Temperature Corrosion of Heat-Resistant Nickel Alloy VZh718

  • 期刊论文

  • 发表日期：

    2025年5月1日

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  • S. V. Zavarzin,
  • E. V. Kurshev,
  • M. E. Boyarkin,
  • A. V. Knyazev

摘要

Abstract

VZh718 alloy, an analogue of the foreign heat-resistant alloy Inconel IN718, was tested for its tendency to corrosion in NaCl, Na2SO4 + NaCl, Na2SO4 + K2SO4 environments at temperatures of 700 and 850°C. It was found that in the absence of chlorides, VZh718 alloy has a high resistance to hot corrosion. The determining role of chlorides in the mechanism of high-temperature corrosion of VZh718 alloy is shown. The presence of sulfates, depending on the temperature, can lead to both a slowdown in chloride-induced corrosion processes and, conversely, significantly accelerate them.