船舶奥氏体不锈钢管TIG自动焊腐蚀行为研究

刘水根, 操戈, 郑鹏华

doi:10.16577/j.issn.1001-1560.2024.0025

材料保护 >

2024 , Vol. 57 >Issue 1: 196 - 203

DOI: https://doi.org/10.16577/j.issn.1001-1560.2024.0025

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船舶奥氏体不锈钢管TIG自动焊腐蚀行为研究

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¹海军装备部； ²中国机械总院集团武汉材料保护研究所有限公司； ³特种表面保护材料及应用技术国家重点实验室

刘水根(1980-)，工程师，主要从事船舶总体技术研究，电话:13554263749，E-mail:1878978180＠qq.com

收稿日期: 2023-11-14

修回日期: 2023-12-11

录用日期: 2024-01-01

网络出版日期: 2024-01-30

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Study on the Corrosion Behavior of Austenitic Stainless Steel Piping in Ships with TIG Automatic Welding

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(1.Department of Naval Armament，Wuhan 430030，China；2.Wuhan Research Institute of Materials Protection Co.，Ltd.，CAM，Wuhan 430030，China；3.State Key Laboratory of Special Surface Protection Materials and Application Technology，Wuhan 430030，China)

LIU Shuigen (1980-)，Engineer，Research Focus: Ship General Technology，Tel.: 13554263749，E-mail:1878978180＠qq.com

Received date: 2023-11-14

Revised date: 2023-12-11

Accepted date: 2024-01-01

Online published: 2024-01-30

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摘要

为了研究船舶管道系统焊接件的腐蚀行为，通过全位置TIG 自动焊技术对316L 奥氏体不锈钢接头进行焊接，采用接头拉伸、弯曲、宏观金相测试以及通过加速腐蚀试验后腐蚀深度、表面形貌、微区电化学测试，就焊接工艺对试样的力学性能和腐蚀行为的影响进行研究。经焊接试验与检测发现，通过改变分区焊接参数设计，可有效保证焊接接头的焊接质量，焊接接头的力学性能合格。对此焊接工艺下焊接后不锈钢管道的腐蚀行为研究结果表明:焊接材料在模拟盐雾湿热/SO2大气环境中进行腐蚀试验后以点蚀为主，腐蚀产物为团状物，且随着腐蚀过程继续进行，腐蚀产物不断生长，相互连接成片，形成完整锈层，对基材起到保护作用，延缓腐蚀向基材深入；腐蚀优先在热影响区进行，并且随腐蚀周期延长，试样母材区的耐蚀性始终高于热影响区。

关键词： 316L 不锈钢; 点蚀; 力学性能; 微区电化学

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刘水根, 操戈, 郑鹏华 . 船舶奥氏体不锈钢管TIG自动焊腐蚀行为研究[J]. 材料保护, 2024 , 57(1) : 196 -203 . DOI: 10.16577/j.issn.1001-1560.2024.0025

Abstract

To study the corrosion behavior of welded parts in marine pipeline systems，316L austenitic stainless steel joints were welded using all-position TIG automatic welding technology.These joints were tested by tensile，bending and macroscopic metallographic tests，as well as corrosion depth，surface morphology and micro-electrochemical tests after accelerated corrosion tests.The effect of the welding process on the mechanical properties and corrosion behavior of the specimens was investigated.Through welding tests and inspections，it was found that by altering the design of the welding parameters for different zones，the welding quality of the welded joint could be effectively guaranteed，and the mechanical properties of the welded joint were qualified.Results on the corrosion behavior of stainless steel pipes after welding under this welding process showed that in the simulated salt spray humid heat/SO2 atmosphere，corrosion of the welded materials was primarily localized as pitting corrosion，and the corrosion products were clumped.As the corrosion process continued，these products grew and connected to each other，forming a complete rust layer.This layer had a protective effect on the substrate，thereby delaying corrosion from penetrating into the substrate.Corrosion was preferentially observed in the heat-affected zone.As the corrosion cycle prolonged，the corrosion resistance of the sample’s base metal zone consistently remained higher than that of the heat-affected zone.

Key words： 316L stainless steel; pitting corrosion; mechanical properties; micro region electrochemistry

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