(1. 中国石油大学 材料科学与工程系，北京 102249；
2. 中石化集团公司工程部，北京 100029)
摘 要: 采用XPS研究镍基合金UNS N06985(即G3)在高压H2S/CO2环境腐蚀前后钝化膜的结构与组成。研究两种环境条件对G3钝化膜的影响，第一种环境为H2S分压3 MPa、CO2分压2 MPa、实验温度为130 ℃；第二种环境为H2S分压3.5 MPa、CO2分压3.5 MPa、实验温度为205 ℃。测试结果表明：腐蚀前和第一种环境条件下获得的钝化膜具有双层结构，钝化膜表层主要为氢氧化物，内层主要是Cr2O3和组成合金的各种金属组成；在第二种环境条件下获得的钝化膜可分为3层，外层主要是硫化物，过渡层含有较多的氢氧化物和金属硫化物，内层主要是氧化物和金属单质。随着环境条件的苛刻，镍基合金钝化膜的保护作用降低，腐蚀破坏程度加重。
关键字: 镍基合金；高H2S分压；钝化膜；XPS分析
（1. Department of Materials Science and Engineering, China University of Petroleum, Beijing 102249, China;
2. Department of Engineering, SINOPEC, Beijing 100029, China）
Abstract:The compositions and structures of the passive films formed on G3 nickel base alloy under high H2S and CO2 partial pressure were investigated by X-ray photoelectron spectroscopy(XPS) as a function of depth. The effects of two type of corrosion environments on the passive films of G3 nickel based alloy were studied. One is the environment with the H2S partial pressure of 3 MPa, CO2 partial pressure of 2 MPa and the exposure temperature of 130 ℃. The other is the environment with the H2S partial pressure of 3.5 MPa, CO2 partial pressure of 3.5 MPa and the exposure temperature of 205 ℃. The results show that the passive films formed on G3 nickel base alloy in environment 1 possess two layer structure similar with the alloy before exposure. The outer layer is hydroxide, the inner layer is Cr2O3 and metals. The passive films obtained in environment 2 display the structure of three layers. The outer layer composes of metal sulfides, the transition layer is the hydroxide of Cr and Ni and the inner layer is the oxides of Ni and Cr and metals. The semiconducting properties of passive films correlate with its structures.
Key words: G3 nickel base alloy; high H2S partial pressure; passive film; XPS analysis
ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK
ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW