Effect of Vacuum Pressure on the Initiation and Propagation of Pitting Corrosion of 2205 Duplex Stainless Steel in Concentrated Seawater  

作　　者：Yong Yang Xue-Ling Hou Mou-Cheng Li 

机构地区：[1]Institute of Materials,School of Materials Science and Engineering,Shanghai University,Shanghai 200072,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2022年第6期1023-1033,共11页金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.U1960103 and 51571139)。

摘　　要：Pitting initiation and stable propagation behaviors of 2205 duplex stainless steel were investigated in the hot concentrated seawater under vacuum pressures by potentiostatic polarization. Both applied potentials and vacuum pressures greatly influence the pitting corrosion. Higher potentials lead to much faster stable pitting initiation and growth rates in both static(101.3 kPa) and dynamic(28.4 kPa) solutions. The pressure reduction can also accelerate the pitting initiation rate. However, the boiling of solution can influence the pitting propagation mechanism. The dynamic actions of boiling bubbles are unfavorable to the pit propagation and result in the formation of relatively smooth pit bottom without secondary pits.

关 键 词：Duplex stainless steel Stable pitting Vacuum pressure Hot concentrated seawater Potentiostatic polarization 

分 类 号：P747[天文地球—海洋科学] TG172[金属学及工艺—金属表面处理]