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Corrosion and Cavitation Erosion Behaviours of Cast Nickel Aluminium Bronze in 3.5% NaCl Solution with Different Sulphide Concentrations
Song, Qi-Ning; Xu, Nan; Tong, Yao; Huang, Chen-Ming; Sun, Shou-Yu; Xu, Chen-Bo; Bao, Ye-Feng; Jiang, Yong-Feng; Qiao, Yan-Xin; Zhu, Zhi-Yuan; Wang, Zheng-Bin
2019-12-01
Source PublicationACTA METALLURGICA SINICA-ENGLISH LETTERS
ISSN1006-7191
Volume32Issue:12Pages:1470-1482
AbstractThe effect of sulphide (Na2S) concentration (SC) on the corrosion and cavitation erosion behaviours of a cast nickel aluminium bronze (NAB) in 3.5% NaCl solution is investigated in this study. The results show that when the SC exceeds 50 ppm, the hydrogen evolution reaction dominates the cathodic process, and a limiting current region appears in the anodic branch of the polarisation curve due to the formation of a copper sulphide film, which is a diffusion-controlled process. After long-term immersion, the increased mass loss rate of NAB with the sulphide additions of 20 and 50 ppm is attributed to the less protective films, which contains a mixture of copper oxides and sulphides. Moreover, NAB undergoes severe localised corrosion (selective phase corrosion, SPC) at the beta ' phases and eutectoid microstructure alpha + kappa(III). By comparison, NAB undergoes general corrosion and a copper sulphide film is formed in 100 and 200 ppm sulphide solutions. Cavitation erosion greatly increases the corrosion rate of NAB in all solutions and causes a negative potential shift in 3.5% NaCl solution due to the film destruction. However, a positive potential shift occurs in the solutions with SC higher than 50 ppm due to the accelerated mass transfer of the cathodic process. The cavitation erosion mass loss rate of NAB increases with the increase of SC. The occurrence of severe SPC decreases the phase boundary cohesion and causes brittle fracture under the cavitation impact. The corrosion-enhanced erosion is the most predominant factor for the cavitation erosion damage when the SC exceeds 50 ppm.
KeywordNickel aluminium bronze Sulphide Corrosion Cavitation erosion Synergy
Indexed BySCI
Language英语
WOS IDWOS:000493679100002
PublisherCHINESE ACAD SCIENCES, INST METAL RESEARCH
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/80643
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Song, Qi-Ning,Xu, Nan,Tong, Yao,et al. Corrosion and Cavitation Erosion Behaviours of Cast Nickel Aluminium Bronze in 3.5% NaCl Solution with Different Sulphide Concentrations[J]. ACTA METALLURGICA SINICA-ENGLISH LETTERS,2019,32(12):1470-1482.
APA Song, Qi-Ning.,Xu, Nan.,Tong, Yao.,Huang, Chen-Ming.,Sun, Shou-Yu.,...&Wang, Zheng-Bin.(2019).Corrosion and Cavitation Erosion Behaviours of Cast Nickel Aluminium Bronze in 3.5% NaCl Solution with Different Sulphide Concentrations.ACTA METALLURGICA SINICA-ENGLISH LETTERS,32(12),1470-1482.
MLA Song, Qi-Ning,et al."Corrosion and Cavitation Erosion Behaviours of Cast Nickel Aluminium Bronze in 3.5% NaCl Solution with Different Sulphide Concentrations".ACTA METALLURGICA SINICA-ENGLISH LETTERS 32.12(2019):1470-1482.
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