低合金钢焊接接头在CO2-O2-H2S-SO2湿气环境中的腐蚀行为
Corrosion Behavior of Welded Joint of Low Alloy Steel in CO2-O2-H2S-SO2 Wet Gas Environment
摘 要
采用不同成分的焊丝和焊接工艺对E36低合金钢进行焊接，通过腐蚀试验和电化学试验对各焊接接头在CO2-O2-H2S-SO2湿气环境中的腐蚀行为进行了研究，并提出了焊接接头减薄协同度（R值）概念。结果表明：用H08MnA焊丝焊接的焊接接头组织由多边形铁素体+针状铁素体+贝氏体组成，在CO2-O2-H2S-SO2湿气环境中的腐蚀速率为0.478 0 mm/a，腐蚀减薄量为0.128 3 mm，腐蚀台阶深度为46.146 μm（介于30~50 μm），台阶倾度为14.1°（<15°），电化学试验结果与腐蚀试验结果保持一致，满足IMO标准和中国船级社指南对货油舱上甲板焊接接头耐腐蚀性能的要求；焊接接头减薄协同度提升了评价低合金钢在CO2-O2-H2S-SO2湿气腐蚀环境中腐蚀行为的科学性。
CO2-O2-H2S-SO2
湿气
腐蚀行为
welded joint
CO2-O2-H2S-SO2
wet gas
corrosion behavior
Abstract
Low alloy steel E36 was welded by different welding technology with different component welding wires. The corrosion behavior of the welded joints of low alloy steels in CO2-O2-H2S-SO2 moisture environment was studied through corrosion experiment and electrochemical testing. A concept of R-value which means thinning synergy to welded joint was proposed. The experimental results show that the microstructure of the welded joint welded with H08MnA welding wire was composed of polygonal ferrite, acicular ferrite and bainite. And in CO2-O2-H2S-SO2 moisture environment, the welded joint had a corrosion rate of 0.478 0 mm/a, a corrosion thinning amount of 0.128 3 mm, a corrosion step depth of 46.146 μm(among 30~50 μm), and a step angle of 14.1°(<15°). The electrochemical test results were consistent with the corrosion test results, and met the requirements of IMO standards and China Classification Society's requirements for the corrosion resistance of welded joints on cargo tank decks. The thinning synergy to welded joint enhanced the scientific evaluation of the corrosion behavior of low alloy steels in CO2-O2-H2S-SO2 moisture corrosion environment.
中图分类号 TG172 DOI 10.11973/fsyfh-201808008
所属栏目 试验研究
基金项目
收稿日期 2017/10/11
修改稿日期
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引用该论文: LIANG Jinming,LIU Hengsan,WANG Miaohui,WANG Xin,CHEN Yunbo. Corrosion Behavior of Welded Joint of Low Alloy Steel in CO2-O2-H2S-SO2 Wet Gas Environment[J]. Corrosion & Protection, 2018, 39(8): 607
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【5】SOARES C G,GARBATOV Y. Reliability of maintained,corrosion protected plate subjected to non-linear corrosion and biaxial compressive loads[M]//MELCHERS R,STEWART M. Applications of Statistics and Probability.[S.l.]:A A Balkema,2000:345-352.
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【11】HINDMARSH M W. The development of water based shop primers[C]//Shipbuilder Technology ISST 2007. Osaka:The Japan Society of Naval Architects and Ocean Engineers and The Royal Institution of Naval Architects,2007.
【12】YASUYUKI S,KATSUMI K,OSAMU H. The Third Generation shop peimer and japanese shipbuilding construction process[C]//Shipbuilder Technology ISST 2007. Osaka:The Japan Society of Naval Architects and Ocean Engineers and The Royal Institution of Naval Architects,2007.
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