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Influence of Hydrostatic Pressure on the Thermodynamics and Kinetics of Metal Corrosion
Ma Rongyao1,2; Zhao Lin1; Wang Changgang1; Mu Xin1; Wei Xin1; Dong Junhua1; Ke Wei1
Corresponding AuthorDong Junhua(jhdong@imr.ac.cn)
2019-02-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume55Issue:2Pages:281-290
AbstractIn recent years, researches on deep sea corrosion have attracted much attention of many researchers. The high hydrostatic pressure is a distinctive feature of deep-sea environment. The hydrostatic pressure affects the corrosive behavior of metallic materials by modifying the composition, structure and compactness of corrosion products, changing the polarization processes of cathode electrode and anode electrode, altering pitting nucleation rate and growth rate, impacting on chemical reaction rate and equilibrium constant, and varying hydrogen diffusion rate and coverage. However, in essence, the influence of hydrostatic pressure on the corrosion behavior of different metal materials is the manifestation of the thermodynamic and kinetic parameters of the corrosion electrode process caused by hydrostatic pressure. At present, the mechanism of effect of hydrostatic pressure on the thermodynamics and kinetics of corroding electrode processes is unclear yet. In addition, the concerns about the effects of hydrostatic pressure on the chemical properties of materials and seawater are comparatively low. Based on thermodynamics and kinetics, the effects of hydrostatic pressure on the activities of electrode material and ions in environment, including on the solubility, fugacity or activity of gases in environment are analyzed. The influence of hydrostatic pressure on pH value and chemical equilibrium is also discussed. The relationships between hydrostatic pressure and equilibrium electrode potential, as well as the exchange current density, are analyzed. The theoretical model of the effect of hydrostatic pressure on the corrosion behavior of active metals is established. The studies have shown that hydrostatic pressure would increase the activities of materials, ions and dissolved gas in environments, and this is closely related to their partial molar volume. The hydrostatic pressure would magnify the difference in the activity of heterogeneous materials. The larger the partial molar volume difference of the heterogeneous materials, the more obvious the difference in activity. Increasing hydrostatic pressure reduces the equilibrium electrode potential of iron and aluminum anode dissolution reaction while reducing its exchange current density. Increasing hydrostatic pressure increases the equilibrium electrode potential of oxygen reaction and decreases its exchange current density. Increasing hydrostatic pressure reduces the equilibrium electrode potential of hydrogen evolution reaction and increases its exchange current density.
Keywordhydrostatic pressure activity fugacity solubility equilibrium electrode potential exchange current density
Funding OrganizationNational Key Research and Development Program of China ; National Natural Science Foundation of China
DOI10.11900/0412.1961.2018.00215
Indexed BySCI
Language英语
Funding ProjectNational Key Research and Development Program of China[2017YFB0702302] ; National Natural Science Foundation of China[51671200] ; National Natural Science Foundation of China[51501204]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000455945800013
PublisherSCIENCE PRESS
Citation statistics
Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/131315
Collection中国科学院金属研究所
Corresponding AuthorDong Junhua
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Ma Rongyao,Zhao Lin,Wang Changgang,et al. Influence of Hydrostatic Pressure on the Thermodynamics and Kinetics of Metal Corrosion[J]. ACTA METALLURGICA SINICA,2019,55(2):281-290.
APA Ma Rongyao.,Zhao Lin.,Wang Changgang.,Mu Xin.,Wei Xin.,...&Ke Wei.(2019).Influence of Hydrostatic Pressure on the Thermodynamics and Kinetics of Metal Corrosion.ACTA METALLURGICA SINICA,55(2),281-290.
MLA Ma Rongyao,et al."Influence of Hydrostatic Pressure on the Thermodynamics and Kinetics of Metal Corrosion".ACTA METALLURGICA SINICA 55.2(2019):281-290.
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