Study on the Corrosion Resistance of Heat-Affected Zone of E690 Low-Alloy High-Strength Steel MAG Welded Joints in Marine Environment

ZHANG Liping; GOU Yi; LUO Xiaodong; WANG Gang; LI Mingzhong; YIN Limeng

doi:10.7512/j.issn.1001-2303.2024.10.09

“Huaguang”Cup Excellent Thesis Recommendation | Views : 0 下载量: 695 CSCD: 0

PDF
Export
Share
Collection
Album

Study on the Corrosion Resistance of Heat-Affected Zone of E690 Low-Alloy High-Strength Steel MAG Welded Joints in Marine Environment
Vol. 54, Issue 10, Pages: 77-85(2024)
Received：29 August 2024，

Published：25 October 2024
DOI： 10.7512/j.issn.1001-2303.2024.10.09
稿件说明：

移动端阅览

张丽萍，苟毅，罗晓东，等.海洋环境下E690低合金高强钢MAG焊接接头热影响区耐腐蚀性能研究［J］.电焊机，2024，54（10）：77-85. DOI： 10.7512/j.issn.1001-2303.2024.10.09.

ZHANG Liping, GOU Yi, LUO Xiaodong, et al.Study on the Corrosion Resistance of Heat-Affected Zone of E690 Low-Alloy High-Strength Steel MAG Welded Joints in Marine Environment[J].Electric Welding Machine, 2024, 54(10): 77-85. DOI： 10.7512/j.issn.1001-2303.2024.10.09.

摘要

随着海洋石油开采技术的发展，高强度钢焊接接头的耐腐蚀性能成为关键问题。为研究E690低合金高强钢MAG焊接接头热影响区（HAZ）在模拟海洋环境下的腐蚀行为，并分析其腐蚀机理，并使用3.5%NaCl溶液作为腐蚀溶液进行浸泡试验。通过光学显微镜、扫描电镜和能谱分析等手段，观察和分析HAZ不同区域的微观组织、力学性能、腐蚀形貌和腐蚀产物成分。结果表明，HAZ不同区域的腐蚀程度由大到小依次为过热区（GRHAZ）

正火区（CHAZ）

混晶区（CGHAZ）。GRHAZ内的腐蚀产物最少且分布均匀，未产生大面积腐蚀，腐蚀产物主要以Fe

和Fe

两种化合物为主，结构表现为团状和柱状。CHAZ和CGHAZ的腐蚀产物相对较多，且分布不均匀，其中CHAZ的局部位置出现加重腐蚀现象。焊接接头设计时应充分考虑HAZ的腐蚀敏感性，并采取相应的防护措施，以保证海洋平台的安全性和可靠性。

Abstract

With the development of marine oil exploitation technology

the corrosion resistance of high-strength steel welded joints has become a critical issue. This paper aims to study the corrosion behavior of the heat-affected zone (HAZ) of E690 low-alloy high-strength steel MAG welded joints in a simulated marine environment

and to analyze the corrosion mechanism. The study uses a 3.5% NaCl solution as the corrosive medium for immersion tests. Techniques such as optical microscopy

scanning electron microscopy

and energy-dispersive X-ray spectroscopy are employed to observe and analyze the microstructure

mechanical properties

corrosion morphology

and corrosion product composition in different regions of the HAZ. The results indicate that the corrosion degree of different regions in the HAZ decreases in the order of overheated zone (GRHAZ)

normalized zone (CHAZ)

mixed grain zone (CGHAZ). The GRHAZ has the least amount of corrosion products

which are evenly distributed

and no large-area corrosion occurs. The corrosion products are primarily composed of two compounds

and Fe

with a structure characterized by nodular and columnar shapes. The CHAZ and CGHAZ have relatively more corrosion products

which are unevenly distributed

and localized areas of enhanced corrosion are observed in the CHAZ. When designing welded joints

the corrosion sensitivity of the HAZ should be fully considered

and appropriate protective measures should be taken to ensu

re the safety and reliability of offshore platforms.With the development of marine oil exploitation technology

and to analyze the corrosion mechanism. The study uses a 3.5% NaCl solution as the corrosive medium for immersion tests. Techniques such as optical microscopy

scanning electron microscopy

and energy-dispersive X-ray spectroscopy are employed to observe and analyze the microstructure

mechanical properties

corrosion morphology

and corrosion product composition in different regions of the HAZ. The results indicate that the corrosion degree of different regions in the HAZ decreases in the order of overheated zone (GRHAZ)

normalized zone (CHAZ)

mixed grain zone (CGHAZ). The GRHAZ has the least amount of corrosion products

which are evenly distributed

and no large-area corrosion occurs. The corrosion products are primarily composed of two compounds

and Fe

with a structure characterized by nodular and columnar shapes. The CHAZ and CGHAZ have relatively more corrosion products

which are unevenly distributed

and localized areas of enhanced corrosion are observed in the CHAZ. When designing welded joints

the corrosion sensitivity of the HAZ should be fully considered

and appropriate protective measures should be taken to ensure the safety and reliability of offshore platforms.

关键词

Keywords

references

吴世品 . 海洋结构用钢DH36厚板焊接接头断裂韧性的研究［D］. 天津：天津大学， 2012 .

WU S P . Study on fracture toughness of DH36 thick plate welded joints for marine structures ［D］. Tianjin ： Tianjin University ， 2012 .

张玲玲，郭佩芳 . 再议海洋油气资源的开发利用［J］. 价值工程， 2012 ， 31 （ 22 ）： 88 - 89 .

ZHANG L L ， GUO P F . Revisiting the development and utilization of marine oil and gas resources ［J］. Value Engineering ， 2012 ， 31 （ 22 ）： 88 - 89 .

陶平 . 海洋结构用钢焊接接头抗裂性研究［D］. 天津：天津大学， 2014 .

TAO P . Study on the crack resistance of welded joints for marine structural steel ［D］. Tianjin ： Tianjin University ， 2014 .

刘振宇，海洋平台用钢的研发生产现状与发展趋势［J］. 鞍钢技术， 2015 ， 27 （ 15 ）： 2 - 3 .

LIU Z Y . Research and development status and trends of steel for offshore platforms ［J］. Angang Technology ， 2015 ， 27 （ 15 ）： 2 - 3 .

Nishikata A ， Ichihara Y ， Hayashi Y ， et al . Influence of electrolyte layer thickness and pH on the initial stage of the atmospheric corrosion of iron ［J］. Journal of the Electrochemical Society ， 1997 ， 144 （ 4 ）： 1244 .

MA H ， DU C ， LIU Z ， et al . Stress corrosion behaviors of E690 high-strength steel in SO2-polluted marine atmosphere ［J］. Acta Metall Sin ， 2016 ， 52 （ 3 ）： 331 - 340 .

Qiao L J ， Luo J L ， Mao X . Hydrogen evolution and enrichment around stress corrosion crack tips of pipeline steels in dilute bicarbonate solution ［J］. Corrosion ， 1998 ， 54 （ 02 ）： 115 - 120 .

蔡建鹏，蒋小华，张彦杰，等 . 坡口形式对 SUS304 奥氏体不锈钢对接接头残余应力和变形的影响［J］. 焊接学报， 2016 ， 37 （ 2 ）： 63 - 66 .

CAI J P ， JIANG X H ， ZHANG Y J ， et al . The influence of groove form on the residual stress and deformation of SUS304 austenitic stainless steel butt joints ［J］. Transactions of The China Welding Institution ， 2016 ， 37 （ 2 ）： 63 - 66 .

董达善，俞翔栋，黄婉娟，等 . Q690 高强钢厚板 MAG 焊焊接工艺［J］. 电焊机， 2015 ， 45 （ 4 ）： 123 - 126 .

DONG D S ， YU X D ， HUANG W J ， et al . MAG welding process of Q690 high-strength steel thick plate ［J］. Electric Welding Machine ， 2015 ， 45 （ 4 ）： 123 - 126 .

谢友柏 . 摩擦学科学及工程应用现状与发展战略研究［M］. 北京：高等教育出版社， 2009 ．

苑少强，梁国俐，刘义 . 高强度船板钢的生产工艺概述［J］. 唐山学院学报， 2007 ， 20 （ 6 ）： 19 - 22 .

YUAN S Q ， LIANG G L ， LIU Y . Overview of the production process of high-strength ship plate steel ［J］. Tangshan University Journal ， 2007 ， 20 （ 6 ）： 19 - 22 .

黄安国，余圣甫，谢明立，等 . 低合金钢焊缝的针状铁素体微观组织［J］. 焊接学报， 2008 （ 03 ）： 45 - 48 .

HUANG A G ， YU S F ， XIE M L ， et al . Acicular ferrite microstructure in low alloy steel welds ［J］. Transactions of The China Welding Institution ， 2008 （ 03 ）： 45 - 48 .

Byun J S ， Shim J H ， Cho Y W ， et al . Non-metallic inclusion and intragranular nucleation of ferrite in Ti-killed C-Mn steel ［J］. Acta Material ， 2003 ， 51 ： 1593 - 1606 .

Li Y ， Liu Z ， Wu W ， et al . Crack growth behaviour of E690 steel in artificial seawater with various pH value ［J］. Corrosion Science ， 2019 ， 164 ： 108336 .

AHMAD Z . Principles of Corrosion Engineering and Corrosion Control ［M］. Butterworth Heinemann ， 2013 .

Srinivasan R ， Fasmin F . An Introduction to Electrochemical Impedance Spectroscopy ［M］. CRC Press ， 2021 .