The effect of Mn addition on corrosion behaviour of equiatomic CoCrFeNi high entropy alloys in NaCl solution

IF 1.5 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Engineering, Science and Technology Pub Date : 2022-12-10 DOI:10.1080/1478422X.2022.2154735

Chenglong Zhang, M. Zhu, Yongfeng Yuan, Shao-yi Guo

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Abstract

ABSTRACT The corrosion behaviour of equiatomic CoCrFeNi and CoCrFeNiMn high entropy alloys manufactured by the vacuum arc melting were studied in 3.5 wt-% NaCl solution. And the reasons for the differences in corrosion resistance were investigated in terms of microstructure, electrochemical behaviour and oxide film. The results show that the two alloys exhibit different corrosion characteristics, with CoCrFeNi alloy displaying typical passivation characteristics and CoCrFeNiMn alloy exhibiting activation behaviour. The CoCrFeNi HEA with compact and protective passive film has lower corrosion current density, larger film resistance and polarisation resistance, meaning a lower corrosion rate and superior corrosion resistance compared with those of CoCrFeNiMn alloy. Moreover, CoCrFeNiMn alloy forms a discontinuous and loose corrosion product film with higher Mn content and lower contents of Cr, Fe and Co compared to the matrix, which decreases its protection performance. The addition of Mn changes the electrochemical behaviour, and higher Mn oxides/hydroxides within oxide film are unfavourable to forming a stable passive film. GRAPHICAL ABSTRACT

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Mn对等原子CoCrFeNi高熵合金在NaCl溶液中腐蚀行为的影响

摘要:研究了真空电弧熔炼制备的等原子CoCrFeNi和CoCrFeNiMn高熵合金在3.5 wt-% NaCl溶液中的腐蚀行为。并从微观结构、电化学行为和氧化膜等方面分析了耐蚀性差异的原因。结果表明，两种合金表现出不同的腐蚀特征，CoCrFeNi合金表现出典型的钝化特征，而CoCrFeNiMn合金表现出典型的活化行为。与CoCrFeNiMn合金相比，具有致密保护性钝化膜的CoCrFeNi HEA具有更低的腐蚀电流密度、更大的膜电阻和极化电阻，具有更低的腐蚀速率和更强的耐腐蚀性。与基体相比，CoCrFeNiMn合金形成不连续松散的腐蚀产物膜，Mn含量较高，Cr、Fe、Co含量较低，降低了其防护性能。Mn的加入改变了电化学行为，氧化膜中较高的Mn氧化物/氢氧化物不利于形成稳定的钝化膜。图形抽象

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来源期刊

Corrosion Engineering, Science and Technology 工程技术-材料科学：综合

CiteScore

3.20

自引率

5.60%

发文量

审稿时长

3.4 months

期刊介绍： Corrosion Engineering, Science and Technology provides broad international coverage of research and practice in corrosion processes and corrosion control. Peer-reviewed contributions address all aspects of corrosion engineering and corrosion science; there is strong emphasis on effective design and materials selection to combat corrosion and the journal carries failure case studies to further knowledge in these areas.