Effects of oxygen concentration on the corrosion behavior of high entropy alloy AlCoCrFeNi in simulated deep sea

Junwei Wang; Wenhui Wen; Fa Xie; Bo Wu; Yang Yang; Jun Cheng; Shilong Zhang; Xianhui Zhang

Heliyon (Jun 2024)

Effects of oxygen concentration on the corrosion behavior of high entropy alloy AlCoCrFeNi in simulated deep sea

Junwei Wang,
Wenhui Wen,
Fa Xie,
Bo Wu,
Yang Yang,
Jun Cheng,
Shilong Zhang,
Xianhui Zhang

Affiliations

Junwei Wang: Xiamen Key Laboratory of Marine Corrosion and Smart Protective Materials, Department of Marine Engineering, Jimei University, Xia Men 361021, China; Fujian Province Key Laboratory of Naval Architecture and Marine Engineering, Department of Marine Engineering, Jimei University, Xia Men 361021, China; Corresponding author. Xiamen Key Laboratory of Marine Corrosion and Smart Protective Materials, Department of Marine Engineering, Jimei University, Xia Men 361021, China.
Wenhui Wen: Xiamen Key Laboratory of Marine Corrosion and Smart Protective Materials, Department of Marine Engineering, Jimei University, Xia Men 361021, China
Fa Xie: Xiamen Key Laboratory of Marine Corrosion and Smart Protective Materials, Department of Marine Engineering, Jimei University, Xia Men 361021, China
Bo Wu: Xiamen Key Laboratory of Marine Corrosion and Smart Protective Materials, Department of Marine Engineering, Jimei University, Xia Men 361021, China; Fujian Province Key Laboratory of Naval Architecture and Marine Engineering, Department of Marine Engineering, Jimei University, Xia Men 361021, China
Yang Yang: Xiamen Key Laboratory of Marine Corrosion and Smart Protective Materials, Department of Marine Engineering, Jimei University, Xia Men 361021, China; Fujian Province Key Laboratory of Naval Architecture and Marine Engineering, Department of Marine Engineering, Jimei University, Xia Men 361021, China
Jun Cheng: College of Mechanical and Energy Engineering, Jimei University, Xia Men 361021, China
Shilong Zhang: Xiamen Key Laboratory of Marine Corrosion and Smart Protective Materials, Department of Marine Engineering, Jimei University, Xia Men 361021, China
Xianhui Zhang: Xiamen Key Laboratory of Marine Corrosion and Smart Protective Materials, Department of Marine Engineering, Jimei University, Xia Men 361021, China; Fujian Province Key Laboratory of Naval Architecture and Marine Engineering, Department of Marine Engineering, Jimei University, Xia Men 361021, China; Corresponding author. Xiamen Key Laboratory of Marine Corrosion and Smart Protective Materials, Department of Marine Engineering, Jimei University, Xia Men 361021, China.

Journal volume & issue: Vol. 10, no. 12
p. e32793

Abstract

Read online

In light of the low dissolved oxygen concentration in the deep sea, the corrosion mechanisms of the high entropy alloy (HEA) AlCoCrFeNi in artificial seawater with varying oxygen concentrations (2.0, 4.0, 7.0 mg/L) were studied. As the oxygen concentration decreases, the alloy's free corrosion potential decreases, and at 2.0 mg/L, the corrosion rate is 421 times higher than that at 7.0 mg/L. The corrosion form transforms from pitting to uniform corrosion. The primary reasons for this are the passivation film is thin under low oxygen concentration conditions, as well as the preferential dissolution of the alloy elements Al and Ni due to their high activity and “local acidizing” properties, respectively. In designing a super corrosion-resistant high entropy alloy for use in the deep sea, it is advisable to avoid the use of element Al and to add Ni with caution.

Published in Heliyon

ISSN: 2405-8440 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Science: Science (General); Social Sciences: Social sciences (General)
Website: https://www.cell.com/heliyon/home

About the journal

Abstract

Keywords