Scholarlink

<p>A Hf+Cr co-modified (Ni,Pt)Al coating was prepared via first electrodeposition of Ni–Cr and Pt-Hf composite plating layer, and then followed by aluminizing. The hot corrosion behavior of the Hf+Cr co-modified (Ni,Pt)Al coating was compared to that of the plain (Ni,Pt)Al coating and the Hf-modified (Ni,Pt)Al coating in a mixed salt environment of Na<sub>2</sub>SO<sub>4</sub>/NaCl (75%: 25%,wt. wt) at 900&#xa0;°C in static air. The results showed that the Hf+Cr co-modified (Ni,Pt)Al coating exhibited enhanced corrosion resistance due to the formation of a more integral oxide scale, shallower internal oxidation/sulfidation, and reduced chloride infiltration. The Ni–Cr composite layer provides a high concentration of Cr in the (Ni,Pt)Al zone, contributing to trapping S and consuming Cl during the hot corrosion process. Additionally, the Ni–Cr composite layer acted as a composition buffer layer between the (Ni,Pt)Al coating and the substrate, alleviating inter-diffusion between the two parts.</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

Hot corrosion behavior of a Hf+Cr co-modified (Ni,Pt)Al coating in the mixed salt of Na2SO4–NaCl at 900 °C

  • 期刊论文

  • 发表日期：

    2025年10月30日

查看全文
  • S. X. Ren,
  • P. Ren,
  • Q. W. Wang,
  • P. Zhang,
  • Y. F. Yang,
  • Y. H. Zhao,
  • W. Li

摘要

A Hf+Cr co-modified (Ni,Pt)Al coating was prepared via first electrodeposition of Ni–Cr and Pt-Hf composite plating layer, and then followed by aluminizing. The hot corrosion behavior of the Hf+Cr co-modified (Ni,Pt)Al coating was compared to that of the plain (Ni,Pt)Al coating and the Hf-modified (Ni,Pt)Al coating in a mixed salt environment of Na2SO4/NaCl (75%: 25%,wt. wt) at 900 °C in static air. The results showed that the Hf+Cr co-modified (Ni,Pt)Al coating exhibited enhanced corrosion resistance due to the formation of a more integral oxide scale, shallower internal oxidation/sulfidation, and reduced chloride infiltration. The Ni–Cr composite layer provides a high concentration of Cr in the (Ni,Pt)Al zone, contributing to trapping S and consuming Cl during the hot corrosion process. Additionally, the Ni–Cr composite layer acted as a composition buffer layer between the (Ni,Pt)Al coating and the substrate, alleviating inter-diffusion between the two parts.