添加制造的GRX-810合金的腐蚀行为在3.5%的NaCl中
Peter Omoniyi1, Samuel Alfred2, Kenneth Looby1
1Department of Mechanical Engineering, Howard University, Washington, DC 20059, USA.
Materials (Basel, Switzerland)
|July 30, 2025
概括
激光粉床化GRX-810,一种高合金,在海洋环境中表现出优越的耐腐蚀性,而不是热静态压缩的版本. 这是由于保护性氧化层,增强其耐用性.
科学领域:
- 材料科学 材料科学 材料科学
- 腐蚀工程 腐蚀工程
- 电化学 电化学 电化学
背景情况:
- 高合金 (HEA) 为要求高的应用提供了独特的性能.
- 了解腐蚀行为对于海洋和结构应用至关重要.
- GRX-810是一种基于NiCoCr的新型HEA,具有先进材料应用的潜力.
研究的目的:
- 为了研究GRX-810在模拟海洋环境 (3.5重量%NaCl) 中的腐蚀特性.
- 为了比较通过激光粉床融合 (LPBF) 处理的GRX-810与热同静压 (HIP) 的腐蚀性能.
- 阐明合金表面形成的被动氧化物薄膜的保护机制.
主要方法:
- 电化学技术:潜在动力极化和电化学阻抗光谱学.
- 表面分析:扫描电子显微镜 (SEM),能量分散式X射线光谱 (EDS) 和X射线衍射 (XRD).
- 在3.5%重量NaCl溶液中进行腐蚀测试.
主要成果:
- 作为LPBF构建的GRX-810表现出比HIPed GRX-810更好的耐腐蚀性,这是由更高的腐蚀潜力和更低的电流密度表明的.
- SEM在LPBF标本上发现了一层密集的,连续的腐蚀产品层,作为防止化物入的屏障.
- EDS和XRD证实被动薄膜被Cr,Ni,Co,Al,Ti和Si丰富,Cr2O3被确定为主要的保护性氧化物阶段.
结论:
- 处理方法显著影响GRX-810.0的耐腐蚀性.
- 通过LPBF加工,可以获得更具保护性的被动膜,从而提高合金在含的环境中的性能.
- GRX-810表现出卓越的被动性和复原能力,使其成为海洋应用的有希望的候选人.
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