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<p>Fe-based amorphous alloy coatings were prepared on Q235 low-carbon steel by cold spray, and the corrosion behavior was evaluated through immersion corrosion and electrochemical tests, and the corrosion mechanism was investigated. The results showed that, through the consolidation of particles under high-speed impact, a thick coating was deposited with intimate interface bonding. However, the defects of pores among particle boundaries and the inclusion of small undeformed particles resulted in an inhomogeneous coating structure, owing to insufficient deformation. The corrosion of the amorphous alloy coating underwent four processes as the immersion corrosion time increased, the formation and rupture of corrosion-induced bulges, growth of acicular corrosion products, spalling of the corrosion layer, and crack formation and propagation on the exposed coating surface. Subsequent electrochemical analysis revealed that, with an increase in corrosion time, the corrosion rate also gradually increased. The acceleration of corrosion was attributed to the formation of cracks on the exposed coating surface, where particle boundaries with stress concentration were vulnerable.</p>

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Immersion Corrosion Behavior and Electrochemical Performance of Cold Sprayed FeSiCrBC Amorphous Coating on Q235 Steel

  • 期刊论文

  • 发表日期：

    2025年5月27日

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  • Qiang Wang,
  • Mingfan Wan,
  • Wenjuan Niu,
  • Peng Han

摘要

Fe-based amorphous alloy coatings were prepared on Q235 low-carbon steel by cold spray, and the corrosion behavior was evaluated through immersion corrosion and electrochemical tests, and the corrosion mechanism was investigated. The results showed that, through the consolidation of particles under high-speed impact, a thick coating was deposited with intimate interface bonding. However, the defects of pores among particle boundaries and the inclusion of small undeformed particles resulted in an inhomogeneous coating structure, owing to insufficient deformation. The corrosion of the amorphous alloy coating underwent four processes as the immersion corrosion time increased, the formation and rupture of corrosion-induced bulges, growth of acicular corrosion products, spalling of the corrosion layer, and crack formation and propagation on the exposed coating surface. Subsequent electrochemical analysis revealed that, with an increase in corrosion time, the corrosion rate also gradually increased. The acceleration of corrosion was attributed to the formation of cracks on the exposed coating surface, where particle boundaries with stress concentration were vulnerable.