Details

Autor(en) / Beteiligte

• Zhicheng, Liu
• Dejun, Kong

Titel

Structural and electrochemical corrosion properties of plasma-sprayed CoCrFeNiMo HEA coating in corrosive solutions

Ist Teil von

• Corrosion engineering, science, and technology, 2022-11, Vol.57 (8), p.730-739

Ort / Verlag

London, England: Taylor & Francis

Erscheinungsjahr

2022

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A CoCrFeNiMo high-entropy alloy (HEA) coating was prepared on Ti6Al4V alloy by plasma spraying technique. The microstructure and phases of the obtained coating were analysed using an ultra-depth-of-field microscope and X-ray diffraction, respectively. The electrochemical corrosion properties of CoCrFeNiMo HEA coating in 3.5% NaCl, 0.1 M H 2 SO 4 and 0.1 M NaOH solutions were comparatively evaluated using an electrochemical workstation, and the corrosion mechanisms were also discussed by the corrosion models. The results show that the CoCrFeNiMo HEA coating is mainly a solid solution structure of face-centered cubic, which forms mechanical bonding at the coating interface. The charge transfer resistance R ct of 597 × 10 16 μA·cm -2 in 0.1 M H 2 SO 4 solution is the highest and the corrosion current density i corr of 4.203 × 10 -7 μA·cm -2 also presents the lowest among the three kinds of corrosive solutions, which shows the highest electrochemical corrosion resistance. As a result, the sequence of corrosion resistance is in 0.1 M H 2 SO 4 solution > in 3.5% NaCl solution > in 0.1 M NaOH solution, in which the corrosion resistance is further improved by the passive film on the CoCrFeNiMo HEA coating.