硫化氫環境下兩種不銹鋼的應力腐蝕開裂行為

劉智勇; 董超芳; 李曉剛; 王立賢; 郅青; 梁平

doi:10.13374/j.issn1001-053x.2009.03.038

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硫化氫環境下兩種不銹鋼的應力腐蝕開裂行為

doi: 10.13374/j.issn1001-053x.2009.03.038

北京科技大學腐蝕與防護中心;北京市腐蝕、磨蝕與表面技術開放實驗室, 北京 100083

基金項目:

國家自然科學基金資助項目(No.50401016)

詳細信息

作者簡介:
劉智勇(1978-),男,博士研究生,E-mail:s20030489@163.com;李曉剛(1963-),男,教授,博士生導師

中圖分類號: TG142.71
計量
- 文章訪問數: 166
- HTML全文瀏覽量: 34
- PDF下載量: 10
- 被引次數: 0
出版歷程
- 收稿日期: 2008-05-28
- 網絡出版日期: 2021-08-09

Stress corrosion cracking behaviour of two stainless steels in hydrogen sulfide environment

Corrosion and Protection Center, University of Science and Technology Beijing;Beijing Key Lab of Corrosion Erosion and Surface Technique, Beijing 100083, China

摘要

摘要: 用U形彎試樣浸泡和慢應變速率拉伸實驗研究了3Cr17Ni7Mo2SiN和00Cr22Ni5Mo3N(2205)不銹鋼在硫化氫介質中的應力腐蝕開裂(SCC)行為.2205不銹鋼的SCC萌生孕育期較長,在pH較低的飽和H₂S溶液中具有明顯的SCC敏感性,其SCC敏感性隨溶液pH值的升高或H₂S含量的降低而迅速降低.3Cr17Ni7Mo2SiN的SCC孕育期均低于2205不銹鋼,在pH ≤ 4.5、H₂S的質量濃度 ≥ 10³mg·L^-1的H₂S介質中均具有明顯的SCC敏感性,其SCC敏感性受pH值和H₂S含量變化影響較小.3Cr17Ni7Mo2SiN的SCC以沿晶裂紋萌生,擴展后轉變為穿晶應力腐蝕開裂;2205不銹鋼近表面處首先發生奧氏體-鐵素體相間氫致開裂,并促進SCC萌生,其SCC為穿晶應力腐蝕開裂.
- 不銹鋼 /
- 硫化氫 /
- 應力腐蝕開裂 /
- 慢應變速率拉伸
Abstract: Stress corrosion cracking (SCC) of 3Cr17Ni7Mo2SiN and 00Cr22Ni5Mo3N (2205) stainless steels in acidic hydrogen sulfide solutions was investigated by slow strain rate tensile test and U-bent specimen immersing test. The time to SCC failure of 2205 stainless steel was much longer than that of 3Cr17Ni7Mo2SiN stainless steel. 2205 stainless steel was highly susceptible to SCC at a lower pH level in saturated H₂S solution, and its SCC susceptibility sharply decreased with increasing pH value or decreasing H₂S concentration in solution. 3Cr17Ni7Mo2SiN stainless steel showed a high susceptibility to SCC in solution with a HES concentration higher than 10³ mg·L^-1 and pH≤4.5. However, the susceptibility varied slightly with the change of pH value and H₂S concentration. SCC of 3Cr17Ni7Mo2SiN stainless steel initiated in an intergranular mode, which transformed into transgranular cracking as the SCC propagated further. For 2205 stainless steel, SCC originated at the place where hydrogen-induced cracking (HIC) occurred along the ferrite/austenite matrix boundaries firstly, and then propagated transgranularly.
- stainless steel /
- hydrogen sulphide /
- stress corrosion cracking /
- slow strain rate tension