B10铜镍合金管线腐蚀穿孔失效分析

宋帅, 秦立民, 孙玉江, 张尚锋, 杨文明, 何悦阳, 徐志刚

doi:10.16577/j.issn.1001-1560.2024.0279

材料保护 >

2024 , Vol. 57 >Issue 12: 138 - 146

DOI: https://doi.org/10.16577/j.issn.1001-1560.2024.0279

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B10铜镍合金管线腐蚀穿孔失效分析

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1.中海油能源发展股份有限公司工程技术分公司2.中国海洋石油有限公司天津分公司3.中海油(天津)管道工程技术有限公司4.海油发展海底管道安全服役保障技术重点实验室5.中海油田服务有限公司一体化和新能源事业部

何悦阳(1996－)，主要从事海底管道及钻具失效分析及预防研究，电话:13752759898，E-mail:597628680＠qq.com

收稿日期: 2024-01-16

修回日期: 2024-09-02

录用日期: 2024-09-08

网络出版日期: 2025-01-14

基金资助

国家重点研发计划项目(2022YFC2806300)

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Failure Analysis of Corrosion-Induced Perforation in B10 Copper-Nickel Alloy Pipelines

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(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)

HE Yueyang (1996－)， Research Focus: Failure Analysis and Prevention of Subsea Pipelines and Drilling Tools，Tel.: 13752759898， E-mail:597628680＠qq.com

Received date: 2024-01-16

Revised date: 2024-09-02

Accepted date: 2024-09-08

Online published: 2025-01-14

Supported by

National Key Research and Development Program Project(2022YFC2806300)

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摘要

某平台用于输送海水的B10 铜镍合金管线，停产检修发现弯头与法兰焊缝接头处有腐蚀穿孔。采用宏观形貌观察、扫描电镜(SEM)和能谱(EDS)、X 射线衍射(XRD)、金相组织检验等方法，分析腐蚀穿孔失效机理。结果表明，在法兰的腐蚀坑底部、冲蚀磨损区、腐蚀沟槽和穿孔部位以及弯头的腐蚀坑底部，都普遍存在着“冰糖块”状的晶间腐蚀形貌，局部存在晶粒被逐层剥落形成“台阶”状的剥蚀形貌；优先腐蚀的晶界形成一个回路，被包围的晶粒发生明显的选择性脱镍和溶解，引起晶粒剥落；法兰硬度偏低及晶粒粗大的柱状晶组织导致材料耐腐蚀性能下降。铜镍合金管线腐蚀穿孔发生在冲蚀磨损的敏感区及耐蚀性最差的焊接热影响区，是由冲蚀磨损、晶间腐蚀、选择性脱成分腐蚀协同作用的结果，需加强服役管线相似部位的腐蚀监测。

关键词： B10 铜镍合金; 失效分析; 冲蚀磨损; 晶间腐蚀; 脱成分腐蚀; 海水

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宋帅, 秦立民, 孙玉江, 张尚锋, 杨文明, 何悦阳, 徐志刚 . B10铜镍合金管线腐蚀穿孔失效分析[J]. 材料保护, 2024 , 57(12) : 138 -146 . DOI: 10.16577/j.issn.1001-1560.2024.0279

Abstract

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.

Key words： B10 copper-nickel alloy; failure analysis; erosion corrosion; intergranular corrosion; dealloying corrosion; seawater

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