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在不同的介质条件下,中合金的腐蚀行为和表面特性

Yingjie Zhang¹, Shuyang Ye¹, Qifan Min¹

¹School of Materials Science and Engineering, University of Jinan, Jinan 250022, China.

Materials (Basel, Switzerland)

|March 13, 2025

概括

这项研究研究了NiFeCoAl中合金 (MEA) 的耐腐蚀性. 在含的溶液中,MEA表现出优越的被动性行为和阻塞性,这归因于稳定的被动膜形成.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
腐蚀科学腐蚀科学

背景情况:

由于其复杂的组成,中合金 (MEAs) 具有独特的特性.
了解MEAs的腐蚀行为对于它们在各种环境中的应用至关重要.
Ni40Fe30Co20Al10 MEA是使用真空弧融制造的.

研究的目的:

为了研究成型Ni40Fe30Co20Al10 MEA的腐蚀特性和被动行为.
为了评估合金在不同腐蚀性介质 (NaCl,HCl,H2SO4) 中的性能.
阐明合金耐腐蚀性和被动薄膜形成背后的机制.

主要方法:

电化学测试 (腐蚀潜力,电流密度,被动区域分析).
表面形态分析 (SEM).
诱导合等离子 (ICP) 试验用于离子度分析.

主要成果:

在酸性溶液中,MEA对一般腐蚀具有更强的抗性.
一种稳定的被动薄膜,最好在含化物溶液中形成,显著抑制金属溶解.
在NaCl溶液中观察到增强的喷孔阻力,这与丰富的未氧化金属原子有关.
(Al) 被确定为被动薄膜形成的关键组成部分,保护富含 (Co) 的内部.
合金在H2SO4中显示出广泛的被动化区域,表明被动薄膜的稳定性,但在酸性介质中遭受了谷物边界腐蚀.
MEA抵抗了单个含有Cl或H+的溶液,但屈服于它们的协同作用.

结论:

由于有效的被动薄膜形成,Ni40Fe30Co20Al10 MEA表现出极好的耐腐蚀性,特别是在化物环境中.
在被动化机制中起着至关重要的作用,增强了合金的保护能力.
虽然在某些条件下稳定,但合金对联合H+和Cl-攻击的敏感性需要进一步考虑实际应用.

关键词:

腐蚀行为腐蚀行为腐蚀介质中的腐蚀.中等的合金合金.被动电影是一种被动电影.插入一个坑洞.真空弧融技术真空弧融技术

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相关概念视频

Corrosion

Corrosion

The degradation of metals due to natural electrochemical processes is known as corrosion. Rust formation on iron, tarnishing of silver, and the blue-green patina that develops on copper are examples of corrosion. Corrosion involves the oxidation of metals. Sometimes it is protective, such as the oxidation of copper or aluminum, wherein a protective layer of metal oxide or its derivatives forms on the surface, protecting the underlying metal from further oxidation. In other cases, corrosion is...