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.
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.
