Influence of Hydrostatic Pressure on Corrosion Behavior of Ultrapure Fe

doi:10.11900/0412.1961.2019.00044

CORC > 金属研究所 > 中国科学院金属研究所

	Influence of Hydrostatic Pressure on Corrosion Behavior of Ultrapure Fe
	Ma Rongyao 1,2; Wang Changgang 1; Mu Xin 1; Wei Xin 1; Zhao Lin 1; Dong Junhua 1; Ke Wei 1
刊名	ACTA METALLURGICA SINICA
	2019-07-11
卷号	55 期号:7 页码:859-874
关键词	hydrostatic pressure electrochemical noise shot noise theory stochastic analysis Hilbert-Huang transform
ISSN号	0412-1961
DOI	10.11900/0412.1961.2019.00044
通讯作者	Dong Junhua(jhdong@imr.ac.cn)
英文摘要	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.
资助项目	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研究方向	Metallurgy & Metallurgical Engineering
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000471268000006
资助机构	National Key Research and Development Program of China ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/134026]
专题	金属研究所_中国科学院金属研究所
通讯作者	Dong Junhua
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 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.