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Corrosion of welded joints of bimetallic composite tube in simulated offshore gas field environment

Deng Hongda (School of Metallurgical and Materials Engineering, Chongqing University of Science and Technology, Chongqing, China)
Zeng Shunpeng (School of Petroleum Engineering, Chongqing University of Science and Technology, Chongqing, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 28 October 2014

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Abstract

Purpose

The purpose of this investigation was to research the corrosion behavior of welded joints of bimetallic composite tube (X65/316L) welded with Inconel 625 in simulated sea water and in simulated production water, respectively.

Design/methodology/approach

The different electrochemical corrosion and galvanic corrosion behaviors of different welded zones were identified using the dynamic potential scan method and galvanic corrosion technique.

Findings

The heat-affected zone (HAZ) of welded joints was the most critical zone for corrosion. The closer to the welding line, more severe was the corrosion that was evident in the HAZ at room temperature. In welded joints of X65 tested in simulated seawater, tremendous corrosion occurred in the HAZ, followed by the base metal, and finally the welding line. However, there were few differences in corrosion of the different zones of welded joints in 316L in simulated production water. In such joints of 316L, corrosion comparatively attacked more easily to the HAZ. In galvanic corrosion tests, tremendous galvanic corrosion was evident on welded joints on X65, but comparatively slight gavanic corrosion appeared at welded joints in 316L. With the increased temperature, galvanic corrosion of welded joints was enhanced.

Originality/value

The results can provide reference for reducing the gavalic corrosion of welded bimetallic composite tube metal in the actual operation.

Keywords

Acknowledgements

The authors would like to acknowledge the financials supported by Science and Technology Project of Chongqing Municipal Education Commission (KJ131403), Natural Science Foundation Project of CQ CSTC (cstc2012jjA50022), Research Foundation of Chongqing University of Science & Technology (CK2010B25, CK2011Z05) and NSFC (51304259).

Citation

Hongda, D. and Shunpeng, Z. (2014), "Corrosion of welded joints of bimetallic composite tube in simulated offshore gas field environment", Anti-Corrosion Methods and Materials, Vol. 61 No. 6, pp. 380-386. https://doi.org/10.1108/ACMM-08-2013-1295

Publisher

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Emerald Group Publishing Limited

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