基于失重法的水下焊接接头腐蚀行为研究

doi:10.11902/1005.4537.2017.179

中国腐蚀与防护学报

2018, Vol. 38

Issue (3): 226-232 DOI: 10.11902/1005.4537.2017.179

研究报告

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基于失重法的水下焊接接头腐蚀行为研究

孔祥峰^1,², 张婧², 姜源庆³, 褚东志², 李春虎¹, 高楠², 吕婧², 邹妍²(

)

1 中国海洋大学化学化工学院青岛 266100
2 山东省科学院海洋仪器仪表研究所青岛 266001
3 国家海洋局烟台海洋环境监测中心站烟台 264006

Corrosion Performance of Underwater Welded Joints of E40 Steel in Coastal Water of Qingdao via Mass-loss Method

Xiangfeng KONG^1,², Jing ZHANG², Yuanqing JIANG³, Dongzhi CHU², Chunhu LI¹, Nan GAO², Jing LV², Yan ZOU²(

)

1 College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
2 Institute of Oceanographic Instrumentation, Shandong Academy of Sciences, Qingdao 266001, China
3 Yantai Oceanic Environmental Monitoring Central Station, State Oceanic Administration, Yantai 264006, China

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摘要:

通过实海挂片腐蚀失重实验,获得了水下焊接接头在青岛海域的腐蚀形貌以及腐蚀失重数据。结果表明,以E40钢板为母材,使用359S水下湿法焊接专用焊条焊接形成焊接接头,经海水浸泡后,焊缝区未见腐蚀,热影响区及母材区则发生严重的腐蚀行为。随着浸泡时间的延长,试样表面蚀坑逐渐增多、增大、增深。母材区域微观形貌随时间变化不大。相对于母材来说,热影响区的微观形貌较为复杂,呈现多种形貌特征。在海水中长期浸泡情况下,腐蚀失重与腐蚀时间之间存在较好的线性关系,试件的腐蚀失重较为稳定,平均腐蚀速率为0.180 mm/a。温度对腐蚀速率的影响较大,青岛海域夏秋时间段腐蚀速率为0.250 mm/a,远高于冬春时节的0.118 mm/a。

关键词 ：水下焊接, 焊缝腐蚀, 失重法, 腐蚀形貌

Abstract：

The corrosion morphology and corrosion rate of underwater welding joints, which were prepared via underwater wet welding with E40 steel plate as base material and 359S as special welding rod, in coastal water of Qingdao was assessed by means of corrosion weight loss method. Results indicated that no corrosion was observed on the weld seam, while the base metal and heat affected zone suffered from serious corrosion after immersion in seawater. With the increase of immersion time, corrosion pits on the test samples are increasing, growing and deepening. The micro-morphology of the base metal varied slightly with time. But, the microstructure of the HAZ is more complex and presents a variety of features compared with the base metal. There is a good linear relation between the mass-loss and the corrosion time. The average corrosion rate of the HAZ and base metal is 0.180 mm/a. Temperature has a great influence on the corrosion rate, and the corrosion rate (0.250 mm/a) in the summer and autumn period in Qingdao seawater is much higher than that in the winter and spring, which is 0.118 mm/a.

Key words： underwater welded welded corrosion mass-loss method corrosion morphology

收稿日期: 2017-11-02

ZTFLH:

TG172.5

基金资助:国家自然科学基金 (41406104和51209129),青岛市应用基础研究计划 (16-5-1-24-jch) 及青岛市市南区科技发展基金 (2014-14-012-SW)

作者简介:

作者简介孔祥峰,男,1985年生,博士生

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引用本文:

孔祥峰, 张婧, 姜源庆, 褚东志, 李春虎, 高楠, 吕婧, 邹妍. 基于失重法的水下焊接接头腐蚀行为研究[J]. 中国腐蚀与防护学报, 2018, 38(3): 226-232.
Xiangfeng KONG, Jing ZHANG, Yuanqing JIANG, Dongzhi CHU, Chunhu LI, Nan GAO, Jing LV, Yan ZOU. Corrosion Performance of Underwater Welded Joints of E40 Steel in Coastal Water of Qingdao via Mass-loss Method. Journal of Chinese Society for Corrosion and protection, 2018, 38(3): 226-232.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2017.179 或 https://www.jcscp.org/CN/Y2018/V38/I3/226

图1 焊接接头试件及加工后的挂片试件

图2 水下焊接接头热影响区附近组织

图3 在海水中浸泡90 d后焊接接头的宏观形貌

图4 清除附着生物及锈层后的水下焊接接头表面宏观形貌

图5 除锈后水下焊接接头试样母材区及热影响区的SEM像

表1 E40钢水下焊接接头失重数据

图6 焊接接头的腐蚀失重及腐蚀速率随时间的变化

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