Electrochemical Behaviors of Ni-Base Superalloy CMSX-4 in 3.5 wt.% NaCl: Effect of Temperature and Preoxidation

Xianzi Lv; Quantong Jiang; Jie Zhang; Jianxin Zhang; Zaiwang Huang; Jizhou Duan; Baorong Hou

doi:10.3390/ma13235478

Electrochemical Behaviors of Ni-Base Superalloy CMSX-4 in 3.5 wt.% NaCl: Effect of Temperature and Preoxidation

Materials (Basel). 2020 Dec 1;13(23):5478. doi: 10.3390/ma13235478.

Authors

Xianzi Lv^{1

2

3}, Quantong Jiang^{1

2

3}, Jie Zhang^{1

2

3}, Jianxin Zhang⁴, Zaiwang Huang^{5

6}, Jizhou Duan^{1

2

3}, Baorong Hou^{1

2

3}

Affiliations

¹ Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, No.7 Nanhai Road, Qingdao 266071, China.
² Open Studio for Marine Corrosion and Protection, Pilot National Laboratory for Marine Science and Technology, Qingdao 266237, China.
³ Center for Ocean Mega-Science, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao 266071, China.
⁴ Key Laboratory for Liquid-Solid Structural Evolution & Processing of Materials (Ministry of Education), Shandong University, Jinan 250061, China.
⁵ State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China.
⁶ Powder Metallurgy Research Institute, Central South University, Changsha 410083, China.

Abstract

The electrochemical behaviors of the Ni-base superalloy CMSX-4 were carried out in 3.5 wt.% NaCl solution using electrochemical technique. The electrochemical corrosion process was divided into four stages, and reactions at the alloy surface and corrosion morphology at each stage were analyzed. The passivity mechanism at the stable passivation stage and the occurrence of pitting corrosion at the transpassivation state were discussed especially. The corrosion parameters including E_corr, E_pass, i_pass and E_pit were compared at different temperatures to reveal the relationship between the temperature and the corrosion resistance properties. The corrosion products were investigated by the aid of X-Ray Diffraction (XRD) and Energy Dispersive Spectroscopy (EDS). By designing different preoxidation procedures, the corrosion mechanism of oxide scales was analyzed for the preoxidized samples.

Keywords: Ni-base superalloy; SEM; corrosion products; electrochemical corrosion; preoxidation.

Abstract

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