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In the present study,the passive film formed on the G3 nickel-base alloy tubing under corrosive conditions including H_2S,CO_2,and Cl~- at 130℃and 205℃is studied with X-ray photoelectron spectroscopy(XPS).The results reveal that the passive film formed at 205℃consists of Cr,Ni,Fe,S and O elements and is over 470 nm in thickness. The passive film can be divided into three layers,the outer-layer is composed of NiS,and Cr_2S_3,the intermediate-layer of Cr(OH)_3,Ni(OH)_2,NiS_2,Cr_2S_3 and a small quantity of NiO and Cr_2O_3,and the inner-layer of NiO,Cr_2O_3,and alloy elements.Due to the invasion of S~(2-) into the passive film and the decrease of the content of chromium oxide in the film,the corrosion resistance of the G3 alloy in the sour environment at 205℃is weakened.
In the present study, the passive film formed on the G3 nickel-base alloy tubing under corrosive conditions including H 2 S, CO 2, and Cl ~ - at 130 ° C and 205 ° C was studied with X-ray photoelectron spectroscopy (XPS). that the passive film formed at 205 ° C consists of Cr, Ni, Fe, S and O elements and is over 470 nm in thickness. The passive film can be divided into three layers, the outer layer is composed of NiS, and Cr_2S_3, the intermediate-layer of Cr (OH) _3, Ni (OH) _2, NiS_2, Cr_2S_3 and a small quantity of NiO and Cr_2O_3, and the inner- layer of NiO, Cr_2O_3, and alloy elements. (2-) into the passive film and the decrease of the content of chromium oxide in the film, the corrosion resistance of the G3 alloy in the sour environment at 205 ° C is weakened.