孙建波,苏鑫,张勇.高温高压H2S/CO2腐蚀产物膜对低铬钢氢渗透行为的影响[J].表面技术,2018,47(6):17-23.
SUN Jian-bo,SU Xin,ZHANG Yong.Effect of H2S/CO2 Corrosion Scales on the Hydrogen Permeation Behavior of Low Chromium Steels[J].Surface Technology,2018,47(6):17-23 |
| 高温高压H2S/CO2腐蚀产物膜对低铬钢氢渗透行为的影响 |
| Effect of H2S/CO2 Corrosion Scales on the Hydrogen Permeation Behavior of Low Chromium Steels |
| 投稿时间：2018-02-13 修订日期：2018-06-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2018.06.003 |
| 中文关键词: 油气管材 低铬钢 H2S/CO2腐蚀 腐蚀产物膜 硫铁化合物 氢渗透 |
| 英文关键词:oil country tubular goods low-chromium steel H2S/CO2 corrosion corrosion product iron sulfides hydrogen permeation |
| 基金项目:国家自然科学基金项目（51471188）；山东省自然科学基金（ZR2014EMM002） |
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| 中文摘要: |
| 目的 探讨含Cr腐蚀产物膜对油管钢氢渗透行为的影响。方法 对80SS、P110-3Cr和P110-7Cr油管钢试样进行高温高压H2S/CO2腐蚀模拟实验，并利用双电解池技术测量试样腐蚀前、后的氢渗透电流密度。通过扫描电子显微镜、能谱分析仪和X射线衍射仪对腐蚀产物膜的微观形貌、成分和物相组成进行分析。结果 三种材料的腐蚀产物主要由亚稳态的马基诺矿型硫铁化合物构成，没有发现典型的CO2腐蚀产物FeCO3晶体，在P110-3Cr（7.4%Cr）和P110-7Cr（14.75%Cr）钢的腐蚀产物膜中有Cr元素富集。随着钢中Cr含量的提高，120 ℃腐蚀后，试样的表观扩散系数减小。80SS、P110-3Cr和P110-7Cr油管钢试样表面无腐蚀膜时，吸附氢浓度分别为0.98×105、9.54×105、9.3×105 mol/cm3。120 ℃腐蚀后，带有腐蚀膜试样的膜层/基体界面钢基体侧的吸附氢浓度分别为0.93×105、5.17×105、8.52×105 mol/cm3。结论 三种油管钢的腐蚀过程均由H2S控制。腐蚀产物膜中Cr元素富集有助于降低带有腐蚀膜试样的表观扩散系数。与不带腐蚀膜的试样相比，三种带腐蚀膜试样的膜层/基体界面钢基体侧的吸附氢浓度降低，腐蚀产物膜对氢渗透具有明显的阻碍作用。 |
| 英文摘要: |
| To investigate the effect of corrosion product film containing chromium on the hydrogen permeation of Tubing Steels, corrosion tests of 80SS, P110-3Cr and P110-7Cr steels were carried out in high pressure and high temperature environment with the coexistence of CO2 and H2S. The hydrogen permeation current density of the specimen was measured by Devanathan-Sthachurski double-cell technique before and after corrosion. Scanning electron microscope/energy dispersive spectroscopy (SEM/ EDS), and x-ray diffraction (XRD) were used to analyzed the morphology and composition of the corrosion scales. The results show that, the corrosion products formed on the three materials are mainly composed of metastable mackinawite iron sulfides, and the typical CO2 corrosion product FeCO3 crystal is not found. There is an enrichment of chromium element in the corrosion products of P110-3Cr (7.4%) and P110-7Cr (13.75%) steels. The apparent diffusion coefficient of 80SS, P110-3Cr and P110-7Cr specimens decreases with the increase of chromium content in steels after corrosion at 120 ℃. The surface hydrogen concentration of 80SS, P110-3Cr and P110-7Cr specimens without corrosion films is 0.98×105 mol/cm3, 9.54×105 mol/cm3 and 9.3×105 mol/cm3 respectively. And the surface hydrogen concentration of the specimens with corrosion films is 0.93×105 mol/cm3, 5.17×105 mol/cm3 and 8.52×105 mol/cm3. The corrosion process of the three tubing steels is controlled by H2S under experimental conditions. The decrease of the effective hydrogen diffusivity is mainly related to the enrichment of chromium element in the corrosion products. Compared with the specimens without corrosion films, the surface hydrogen concentration of the specimens with corrosion films is reduced, and the corrosion product films have an obvious resistance to hydrogen permeation. |
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