Scholarlink

<p>A Zn-Ni coating is electrodeposited on the surface of Q235B steel and passivated via a trivalent chromium solution with silicate to greatly improve its corrosion resistance in a simulated concrete pore solution. The surface roughnesses of the zinc coating and Zn-Ni coating are approximately 0.457 and 0.332&#xa0;μm, respectively. The surface of the passivated Zn-Ni coating is covered with metal oxides and hydroxides due to chemical reactions, which slightly increase the roughness. The thicknesses of the Zn coating, Zn-Ni coating and passivated Zn-Ni coating are all approximately 25&#xa0;μm. The surface of the Zn-Ni alloy coating is composed of many compact nodular structures. After passivation, the passivated Zn-Ni alloy coating presents a net-shaped morphology. The passivated Zn-Ni alloy coating contains 76.9 Zn, 14.3 Ni, 6.3 Cr and 2.5% Si. After immersion in the simulated concrete pore solution for 9&#xa0;days, the passivated Zn-Ni alloy coating has the lowest current density of 10.529&#xa0;μA/cm<sup>2</sup>, indicating the best corrosion resistance. The corrosion products on the passivated Zn-Ni coating are denser and less porous than those on the surface of the Zn and ZnNi coatings.</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

Electrodeposition and Passivation of ZnNi Alloy Coating on Q235B Steel and its Corrosion Resistance Performance in Simulated Concrete Pore Solution

  • 期刊论文

  • 发表日期：

    2025年9月3日

查看全文
  • Chen Tiejun,
  • Wang Yan,
  • Wang Jing,
  • Zhang Xueqin

摘要

A Zn-Ni coating is electrodeposited on the surface of Q235B steel and passivated via a trivalent chromium solution with silicate to greatly improve its corrosion resistance in a simulated concrete pore solution. The surface roughnesses of the zinc coating and Zn-Ni coating are approximately 0.457 and 0.332 μm, respectively. The surface of the passivated Zn-Ni coating is covered with metal oxides and hydroxides due to chemical reactions, which slightly increase the roughness. The thicknesses of the Zn coating, Zn-Ni coating and passivated Zn-Ni coating are all approximately 25 μm. The surface of the Zn-Ni alloy coating is composed of many compact nodular structures. After passivation, the passivated Zn-Ni alloy coating presents a net-shaped morphology. The passivated Zn-Ni alloy coating contains 76.9 Zn, 14.3 Ni, 6.3 Cr and 2.5% Si. After immersion in the simulated concrete pore solution for 9 days, the passivated Zn-Ni alloy coating has the lowest current density of 10.529 μA/cm2, indicating the best corrosion resistance. The corrosion products on the passivated Zn-Ni coating are denser and less porous than those on the surface of the Zn and ZnNi coatings.