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Effect of Fim⁃Formation Potentials on Electrochemical Behavior of 2205 Duplex Stainless Steel
Chen Xu, Yang Jiaxing, Song Bo, He Chuan
Abstract489)   HTML    PDF (1250KB)(224)      
Corrosion resistance of stainless steel is closely related to the formation conditions of passivation film. The effects of film⁃formation potentials on the characteristics and electronic structure of passivation films on 2205 duplex stainless steel surface in 3.5% NaCl solution were explored by potentiodynamic polarization technique, electrochemical impedance spectroscope, and Mott⁃Schottky methods. The results show that with the increase in film⁃formation potential, the passivation film is first porous and then becomes dense. However, under the film⁃formation potential of 0.90 V, the passivation film finally underwent an additional porous structure process. With the increase of film⁃formation potential, donor density and acceptor density in passivation film increase, and the formation rate of passivation film increase. However, the adsorption of erosive anion is also promoted by the increase of film⁃formation potential. The defects and porosity of the outer layer of passivation film increase with the increase of potential, which led to the increase of passivation film thickness. The compactness of the inner layer of the passivation film is the best under the film⁃forming potential of 0.60 V(SCE). With the increase of the potential to 0.90 V(SCE), the inner layer oxide becomes porous, the compactness of the passivation film degraded, and the rupture risk of the passivated film is the highest.
2020, 40 (6): 52-58. DOI: 10.3969/j.issn.1672-6952.2020.06.010
Discussion on the Schemata of ERM Data Warehouse
LIU Yang,HE Chuan,LI Xin,GONG Xiao -yan
Abstract445)      PDF (177KB)(312)      
    If an enterprise does not monopolize the market , most members o n the market are not its customers.In order to attract the potential customers, enterprises must spend a large amount of time and energy on understanding and analyzing user' s behaviors. Among the traditional commercial affairs , it possibly depends on intuition but no t on facts, because they cannot trace the non -customer' s behavior .But in the ERM data warehouse systems of oriented e -commerce , user' s behaviors can be understood and analyzed through click -stream data .User' s activities can be linked to make a complete access history by using clustering methods. Depending on it , more customers are attracted and market requirements are satisfied better .Through comparing the difference between CRM system and ERM system in B2C environment , the schema of ERM data warehouse was discussed .The schema contains the user -behavior -fact table to record all activities of different users, the basic data dimensional tables and clustering data dimensional tables .An improved method of the schema of ERM data warehouse under the different E-commerce environments was also discussed.
2006, 26 (2): 66-70.