Failure Analysis of Corrosion-Induced Perforation in B10 Copper-Nickel Alloy Pipelines
The B10 copper-nickel alloy pipeline used for seawater transportation on a certain platform was found to have corrosion perforation at the weld joint between the elbow and the flange during a shutdown inspection.In this study， the failure mechanism of corrosion perforation was analyzed using macrosc...
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Editorial Department of Materials Protection
2024-12-01
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| Series: | Cailiao Baohu |
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| Online Access: | http://www.mat-pro.com/fileup/1001-1560/PDF/20241216.pdf |
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| author | SONG Shuai, QIN Limin, SUN Yujiang, ZHANG Shangfeng, YANG Wenming, HE Yueyang, XU Zhigang |
| author_facet | SONG Shuai, QIN Limin, SUN Yujiang, ZHANG Shangfeng, YANG Wenming, HE Yueyang, XU Zhigang |
| author_sort | SONG Shuai, QIN Limin, SUN Yujiang, ZHANG Shangfeng, YANG Wenming, HE Yueyang, XU Zhigang |
| collection | DOAJ |
| description | The B10 copper-nickel alloy pipeline used for seawater transportation on a certain platform was found to have corrosion perforation at the weld joint between the elbow and the flange during a shutdown inspection.In this study， the failure mechanism of corrosion perforation was analyzed using macroscopic morphology observation，scanning electron microscopy (SEM)，energy-dispersive spectroscopy (EDS)，X-ray diffraction (XRD) and metallographic examination.Results showed that “sugar cube”-like intergranular corrosion morphologies were commonly observed at the bottom of corrosion pits on the flange， in erosion-wear areas， corrosion grooves， perforated regions and at the bottom of corrosion pits on the elbow.Locally， a “stepped” exfoliation morphology was observed， where grains were progressively stripped layer by layer.The preferentially corroded grain boundaries formed a circuit， and the surrounded grains were selectively denickelized and dissolved， resulting in grain spalling.The reduced hardness and coarse columnar grain structure of the flange further decreased the material’s corrosion resistance.The corrosion perforation of the copper-nickel alloy pipeline occurred in the erosion-sensitive zones and the weld heat-affected zones with the poorest corrosion resistance.This failure was the result of the synergistic effects of erosion wear， intergranular corrosion and selective dealloying.Enhanced corrosion monitoring is recommended for similar locations in service pipelines. |
| format | Article |
| id | doaj-art-e4f12942ddee4b5eb5d1c3e04a83c8fa |
| institution | Kabale University |
| issn | 1001-1560 |
| language | zho |
| publishDate | 2024-12-01 |
| publisher | Editorial Department of Materials Protection |
| record_format | Article |
| series | Cailiao Baohu |
| spelling | doaj-art-e4f12942ddee4b5eb5d1c3e04a83c8fa2025-01-14T07:51:35ZzhoEditorial Department of Materials ProtectionCailiao Baohu1001-15602024-12-01571213814610.16577/j.issn.1001-1560.2024.0279Failure Analysis of Corrosion-Induced Perforation in B10 Copper-Nickel Alloy PipelinesSONG Shuai, QIN Limin, SUN Yujiang, ZHANG Shangfeng, YANG Wenming, HE Yueyang, XU Zhigang0(1.Engineering Technology Branch， CNOOC Energy Development Co.， Ltd.， Tianjin 300452， China；2.Tianjin Branch， CNOOC Energy Development Co.， Ltd.， Tianjin 3004522， China；3.CNOOC (Tianjin) Pipeline Engineering Technology Co.， Ltd.， Tianjin 300452， China；4.Center Tech Key Laboratory of Subsea Pipeline Safety Service and Guarantee Technology， Tianjin 300452， China；5.Integration and New Energy Division， China Oilfield Service Co.， Ltd.， Tianjin 300459， China)The B10 copper-nickel alloy pipeline used for seawater transportation on a certain platform was found to have corrosion perforation at the weld joint between the elbow and the flange during a shutdown inspection.In this study， the failure mechanism of corrosion perforation was analyzed using macroscopic morphology observation，scanning electron microscopy (SEM)，energy-dispersive spectroscopy (EDS)，X-ray diffraction (XRD) and metallographic examination.Results showed that “sugar cube”-like intergranular corrosion morphologies were commonly observed at the bottom of corrosion pits on the flange， in erosion-wear areas， corrosion grooves， perforated regions and at the bottom of corrosion pits on the elbow.Locally， a “stepped” exfoliation morphology was observed， where grains were progressively stripped layer by layer.The preferentially corroded grain boundaries formed a circuit， and the surrounded grains were selectively denickelized and dissolved， resulting in grain spalling.The reduced hardness and coarse columnar grain structure of the flange further decreased the material’s corrosion resistance.The corrosion perforation of the copper-nickel alloy pipeline occurred in the erosion-sensitive zones and the weld heat-affected zones with the poorest corrosion resistance.This failure was the result of the synergistic effects of erosion wear， intergranular corrosion and selective dealloying.Enhanced corrosion monitoring is recommended for similar locations in service pipelines.http://www.mat-pro.com/fileup/1001-1560/PDF/20241216.pdfb10 copper-nickel alloy； failure analysis； erosion corrosion； intergranular corrosion； dealloying corrosion； seawater |
| spellingShingle | SONG Shuai, QIN Limin, SUN Yujiang, ZHANG Shangfeng, YANG Wenming, HE Yueyang, XU Zhigang Failure Analysis of Corrosion-Induced Perforation in B10 Copper-Nickel Alloy Pipelines Cailiao Baohu b10 copper-nickel alloy； failure analysis； erosion corrosion； intergranular corrosion； dealloying corrosion； seawater |
| title | Failure Analysis of Corrosion-Induced Perforation in B10 Copper-Nickel Alloy Pipelines |
| title_full | Failure Analysis of Corrosion-Induced Perforation in B10 Copper-Nickel Alloy Pipelines |
| title_fullStr | Failure Analysis of Corrosion-Induced Perforation in B10 Copper-Nickel Alloy Pipelines |
| title_full_unstemmed | Failure Analysis of Corrosion-Induced Perforation in B10 Copper-Nickel Alloy Pipelines |
| title_short | Failure Analysis of Corrosion-Induced Perforation in B10 Copper-Nickel Alloy Pipelines |
| title_sort | failure analysis of corrosion induced perforation in b10 copper nickel alloy pipelines |
| topic | b10 copper-nickel alloy； failure analysis； erosion corrosion； intergranular corrosion； dealloying corrosion； seawater |
| url | http://www.mat-pro.com/fileup/1001-1560/PDF/20241216.pdf |
| work_keys_str_mv | AT songshuaiqinliminsunyujiangzhangshangfengyangwenmingheyueyangxuzhigang failureanalysisofcorrosioninducedperforationinb10coppernickelalloypipelines |