|Place of Conferral||北京|
|Keyword||东黄海 离岸海水腐蚀 碳钢 不锈钢 季节变化|
|Other Abstract||With the development of ocean exploitation, steel structures are widely used in various marine engineering. However the serious corrosion problems must be considered because of the complex ocean environment. Recently, researches on the corrosion behavior of seawater are mainly focused on the coastal and shore-based test stations, indicating the lack understanding of corrosion behavior and corrosion process in offshore seawater. Consequently, the influence of typical environmental factors on the corrosion behavior of steel in seawater, especially in offshore seawater, has important reference significance to the marine engineering.|
On the basis of such a background, corrosion investigations of four kinds of steels in field were conducted in the Yellow Sea and the East China Sea in four seasons by four cruises. The electrochemical corrosion behaviors in offshore seawater and their varying with the seasonal changing were studied by using the polarization curves and electrochemical impedance spectroscopy on the Dongfanghong 2 and Science 3 research vessels. The experimental data obtained include: the open circuit potential, electrochemical impedance spectroscopy and polarization curves of 45 steel, Q235 steel, X80 pipeline steel and 316L stainless steel in the Yellow Sea in the summer (20 stations) and winter (20 stations) in 2016; the open circuit potential, electrochemical impedance spectroscopy and polarization curves of the previously mentioned four steels in the East China Sea in the spring (18 stations) and autumn (20 stations) in 2016. The main results and conclusions are as follows:
(1) In the Yellow Sea, the distribution of corrosion rates of 45 steel, Q235 steel and X80 pipeline steel declined from north to south, also from the central area to the offshore, which comes to agreement with distribution of dissolved oxygen. The corrosion rate of 316L stainless steel was distributed evenly in the Yellow Sea, and its spatial variation was not obvious. Corrosion behaviors of 45 steel, Q235 steel and X80 pipeline steel in the Yellow Sea were characterized with the apparent seasonal variation; corrosion in winter was more severe than summer. The corrosion behaviors of three kinds of steels in coastal waters were closely related to the formation and extinction of low oxygen zone, while the corrosion status in the central area might be affected by the Yellow Sea cold Water Mass and the Yellow Sea Warm Current. Corrosion behaviors of 316L stainless steel were not apparent with the accompanying changes of seasons.
(2) In the East China Sea, the distribution of corrosion rates of 45 steel, Q235 steel and X80 pipeline steel declined from the central area to the offshore, which effected by the temperature, salinity, dissolved oxygen. The corrosion rate of 316L stainless steel was distributed evenly in the East China Sea. Corrosion behaviors of 45 steel, Q235 steel and X80 pipeline steel in the East China Sea were characterized with the apparent seasonal variation; corrosion in autumn was more severe than spring. The corrosion behaviors of three kinds of steels in coastal waters were strongly related to the formation and extinction of low oxygen zone and the nature of coastal current water, while the corrosion status in the central area might be influenced by the taiwan warm current. Corrosion behaviors of 316L stainless steel were not apparent with the accompanying changes of seasons in the East China Sea.
(3) In the Yellow Sea and East China Sea, among the four steels, 316L stainless steel had the best corrosion resistance, followed by X80 pipeline steel and 45 steel, and the corrosion resistance of Q235 steel is the worst. The corrosion resistance is mainly related to their microstructure. The distribution of corrosion rates of 45 steel, Q235 steel and X80 pipeline steel declined from the central area to the offshore and corrosion behaviors of 316L stainless steel were not apparent with changing of location and seasons.
|Subject Area||化学 ; 物理化学 ; 电化学 ; 地球科学 ; 海洋科学 ; 海洋调查与监测 ; 材料科学 ; 金属材料 ; 金属材料其他学科|
|高杨. 典型钢材在黄东海离岸海水中电化学腐蚀行为研究[D]. 北京. 中国科学院大学,2017.|
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