图书来源:二元合金相图及中间相晶体结构 二元合金相图及中间相晶体结构
作 者:唐仁政 田荣璋
出版时间:2009-05
定 价:320元
图书ISBN:978-7-81105-831-4
出版单位:中南大学出版社
Xue-qun Cheng,Xiao-gang Li,Chao-fang Dong Corrosion and Protection Center,University of Science and Technology Beijing,Beijing 100083,China
摘 要:The properties of the passive film formed on 2205 stainless steel in acetic acid at high temperature that contained chloride ions were studied by atomic absorption spectrometry (AAS),X-ray photoelectron spectroscopy (XPS),and electrochemical polarization measurements. AAS results show that molybdenum is enriched on the surface as the passive film is dissolved. This enrichment decreases the corrosion resistance because it hinders chloride adsorption and Fe ion dissolution,and acts as a local pH buffer because it consumes protons. The dissolution ratio of Fe/Cr is approximately 10 during the active dissolution of the passive film. XPS results indicate that when the potential is in the passivation region,Cr comprises about 50% of the metal cations in the near-surface region of the passive film and is the main metal constituent in this region. When the polarization potential is much greater than the transpas-sivation potential,the Mo content accounts for approximately 45% of the metal cations in the near-surface region; Fe and Ni have no obvious influence on the formation,dissolution,or puncture of the passive film.
关键词: