| Influence of Hydrostatic Pressure on Corrosion Behavior of Ultrapure Fe | |
| Ma Rongyao1,2; Wang Changgang1; Mu Xin1; Wei Xin1; Zhao Lin1; Dong Junhua1; Ke Wei1 | |
| Corresponding Author | Dong Junhua(jhdong@imr.ac.cn) |
| 2019-07-11 | |
| Source Publication | ACTA METALLURGICA SINICA
 |
| ISSN | 0412-1961 |
| Volume | 55Issue:7Pages:859-874 |
| Abstract | Hydrostatic pressure is part of the crucial factors affecting deep sea corrosion. At present, there have been a lot of studies on the pitting behavior of metallic materials under hydrostatic pressure, but most of them take passive metallic materials as the research object, and the influence rule of hydrostatic pressure on the pitting behavior of metallic materials also presents diversity. People not only have no clear understanding of its mechanism, but also have some disputes. The generation and growth of pitting corrosion are dependent on the structure of materials, chemical composition and service environment. Inclusion, passivation ability and surface roughness can all affect the pitting behavior of metal materials. Due to the single composition and simple structure of ultrapure Fe, the influence of phase, inclusion and other factors on corrosion behavior under hydrostatic pressure can be avoided, which is more conducive to elucidate the mechanism of hydrostatic pressure on metal corrosion behavior. In addition, the influence of hydrostatic pressure on the corrosion behavior of ultrapure Fe is rarely reported. So, the effect of hydrostatic pressure on the corrosion behavior of ultrapure Fe exposed to 3.5%NaCl aqueous solution is investigated by potentiodynamic polarization curves and electrochemical noise method. The noise signals are analyzed by shot noise theory, stochastic analysis and Hilbert-Huang transform. Besides, the surface morphology of the corrosion sample is observed by SEM. The results of weight loss test and potentiodynamic polarization study show that increasing hydrostatic pressure accelerated the corrosion rate of ultrapure Fe exposed to 3.5%NaCl. The results of electrochemical noise study show that increasing hydrostatic pressure promotes the development of pitting corrosion and increases the tendency of local corrosion throughout the immersion. At the beginning of soaking, local corrosion (such as pitting nucleation, metastable pitting and stable pitting) mainly occurred in ultrapure Fe, increasing of hydrostatic pressure inhibits the pitting nucleation process, but promotes the development of metastable pitting and steady pitting, and increases the growth probability of pitting. With the immersion time prolonging, the uniform corrosion gradually changed into the principal corrosion type, increasing hydrostatic pressure still promotes the development of metastable pitting and stable pitting and improves the growth probability of pitting corrosion, but relatively inhibits the uniform corrosion process. |
| Keyword | hydrostatic pressure electrochemical noise shot noise theory stochastic analysis Hilbert-Huang transform |
| Funding Organization | National Key Research and Development Program of China ; National Natural Science Foundation of China |
| DOI | 10.11900/0412.1961.2019.00044 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | National Key Research and Development Program of China[2017YFB0702302] ; National Natural Science Foundation of China[51671200] ; National Natural Science Foundation of China[51501204] ; National Natural Science Foundation of China[51801219] |
| WOS Research Area | Metallurgy & Metallurgical Engineering |
| WOS Subject | Metallurgy & Metallurgical Engineering |
| WOS ID | WOS:000471268000006 |
| Publisher | SCIENCE PRESS |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/134023 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Dong Junhua |
| Affiliation | 1.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,Wang Changgang,Mu Xin,et al. Influence of Hydrostatic Pressure on Corrosion Behavior of Ultrapure Fe[J]. ACTA METALLURGICA SINICA,2019,55(7):859-874. |
| APA | Ma Rongyao.,Wang Changgang.,Mu Xin.,Wei Xin.,Zhao Lin.,...&Ke Wei.(2019).Influence of Hydrostatic Pressure on Corrosion Behavior of Ultrapure Fe.ACTA METALLURGICA SINICA,55(7),859-874. |
| MLA | Ma Rongyao,et al."Influence of Hydrostatic Pressure on Corrosion Behavior of Ultrapure Fe".ACTA METALLURGICA SINICA 55.7(2019):859-874. |
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