目的 明确UNS N08825合金材料在高含硫化氢含元素硫环境下的适应性,保障材料的安全服役。方法 采用轴向恒载荷拉伸试验方法,模拟某高腐蚀性气田实际服役工况,开展高含硫化氢、高温、高含氯离子、含元素硫工况下UNS N08825合金材料长周期抗应力腐蚀开裂性能研究,并对试验前后材料力学性能的变化进行对比分析。结果 在高含硫化氢且含元素硫环境下,UNS N08825合金材料在132 ℃和90 ℃时均具有较好的抗应力腐蚀开裂性能,但均存在一定的点腐蚀风险。试样表面腐蚀产物膜主要由Cr和Ni元素的氢氧化物和氧化物、Fe元素的硫化物和氧化物构成。元素硫和氯离子共同作用促进了试样表面点蚀坑的形成。由于氢渗透的影响,UNS N08825合金试样的强度、韧性及刚度均有不同程度的降低,且随着温度的升高,下降幅度变大。结论 在高含硫化氢、高含氯离子、含元素硫且温度不低于90 ℃时,UNS N08825合金材料存在点腐蚀风险,应谨慎采用。
Abstract
The work aims to evaluate the suitability of UNS N08825 alloy in H2S and elemental sulfur environments, ensuring safe material service. The axial constant-load tensile test method was adopted to simulate the actual service conditions of a highly corrosive gas field. A long-term study on the stress corrosion cracking resistance of UNS N08825 alloy was conducted under the combined conditions of high H2S, high temperature, high chloride ion content and elemental sulfur. In addition, the changes in mechanical properties of the material before and after the test were compared and analyzed. The UNS N08825 alloy had good resistance to stress corrosion cracking (SCC) at both 132 ℃ and 90 ℃ under the environment containing high H2S content and sulfur, but showed pitting corrosion risk. The corrosion product films mainly consisted of hydroxide and oxides of Cr and Ni, sulfides and oxides of Fe, and the combination of sulfur and chloride promoted the formation of pitting. The strength, toughness and stiffness of the UNS N08825 alloy decreased due to the effect of hydrogen permeation. As the temperature increased, the dropped value became greater. Therefore, when exposed to environments containing high H2S, high chloride ions and elemental sulfur at a temperature of no less than 90 ℃, the UNS N08825 alloy is susceptible to pitting corrosion and should be used with caution.
关键词
恒载荷 /
硫化氢 /
高温 /
元素硫 /
UNS N08825 /
应力腐蚀开裂 /
点腐蚀
Key words
constant-load /
H2S /
high temperature /
elemental sulfur /
UNS N08825 /
stress corrosion cracking /
pitting corrosion
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基金
中国石油工程建设有限公司西南分公司科研项目（FKY2025-501）
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