摘要
Effects of 405 stainless steel(405 SS) on crevice corrosion behavior of Alloy 690 in high-temperature pure water were investigated.Results revealed that the corrosion rate of Alloy 690 was low within the crevice.It was likely attributed to the fact that a Cr-rich inner oxide film and a Ni-rich layer beneath this oxide film formed upon Alloy 690,inhibiting the diffu sion of oxygen towards the oxide/matrix interface.Moreover,the Fe2+ions dissolved from 405 SS consumed most of oxygen,leading to less oxygen participating in the oxidation of Alloy 690.In addition,it was found that Fe concentration continuously decreased from the surface of the inner oxide film to the oxide/matrix interface of Alloy 690 within the crevice,which was probably due to the diffusion of Fe2+ions dissolved from 405 SS into the inner oxide film.
基金
supported by the National Natural Science Foundation of China No.51671201
the National Scienceand Technology Major Project No.2017ZX06002003-004-002
the Key Programs of the Chinese Academy of Sciences Research on the Development of Nuclear Power Materials and Service Security Technology,No.ZDRW-CN-2017-1
the Innovation Fund of Institute of Metal Research,Chinese Academy of Sciences No.SCJJ-2013-ZD-02。
