The Early-Stage Propagation of Localized Corrosion of a Sintered NdFeB Alloy in Aqueous Environments

Yang, Lin1; Ouyang, Jialu1; Wang, Zi-Ming1; Song, Guang-Ling1,2,3,4

2023-07-01

10.1007/s11665-023-08280-y

JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE   影响因子和分区

1059-9495

1544-1024

To capture the initial corrosion of sintered NdFeB alloys, a quasi-in situ investigation of the localized corrosion behavior was conducted in low-conductive aqueous solutions. It was clearly observed that the corrosion pits were started from the active sites in matrix phase adjacent to the phase boundaries and the oxide rings were simultaneously deposited some distance from the pits. The spatial separation of the anode and cathode areas during the corrosion could be explained by the potential-pH diagram of Fe and the transportation of hydroxide and ferrous ions in the solution. Based on the variation of oxide rings with environmental factors, it was deduced that the ring-shaped deposition of corrosion products was cooperatively determined by the ferrous cations from pits and the hydroxide anion generation at the cathodic regions limited by the diffusion of oxygen from the bulk solution. This observation gives new insights into the galvanic corrosion of alloys in aqueous media.

cathode reaction deionized water localized corrosion NdFeB alloy oxide ring

SCI ; EI

英语

其他

Science and Technology Planning Project of Fujian Province[2018H6017] ; Fundamental Research Funds for the Central Universities[20720210052]

Materials Science

Materials Science, Multidisciplinary

WOS:001023877900001

SPRINGER

20232814394304

Cathodes ; Corrosive effects ; Deionized water ; Galvanic corrosion ; Localized corrosion ; Neodymium alloys ; Sintering

Water Treatment Techniques:445.1 ; Metals Corrosion:539.1 ; Iron Alloys:545.2 ; Rare Earth Metals:547.2

MATERIALS SCIENCE

Web of Science

1.Xiamen Univ, Coll Mat, Ctr Marine Mat Corros & Protect, Xiamen 361005, Peoples R China
2.Southern Univ Sci & Technol, Dept Ocean Sci & Engn, Shenzhen 518055, Guangdong, Peoples R China
3.Xiamen Univ, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China
4.Univ Queensland, Sch Mech & Min Engn, St Lucia, Qld 4072, Australia

Yang, Lin,Ouyang, Jialu,Wang, Zi-Ming,et al. The Early-Stage Propagation of Localized Corrosion of a Sintered NdFeB Alloy in Aqueous Environments[J]. JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE,2023.

Yang, Lin,Ouyang, Jialu,Wang, Zi-Ming,&Song, Guang-Ling.(2023).The Early-Stage Propagation of Localized Corrosion of a Sintered NdFeB Alloy in Aqueous Environments.JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE.

Yang, Lin,et al."The Early-Stage Propagation of Localized Corrosion of a Sintered NdFeB Alloy in Aqueous Environments".JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE (2023).