Corrosion Behavior of Armor Layer Steel of Flexible Pipes Exposed to Seawater Environment

doi:10.12068/j.issn.1005-3026.2017.08.006

Journal of Northeastern University Natural Science ›› 2017, Vol. 38 ›› Issue (8): 1088-1092.DOI: 10.12068/j.issn.1005-3026.2017.08.006

• Materials & Metallurgy • Previous Articles Next Articles

Corrosion Behavior of Armor Layer Steel of Flexible Pipes Exposed to Seawater Environment

LIU Zhen-guang^1,2， GAO Xiu-hua¹， DU Lin-xiu¹， LI Jian-ping¹

1. State Key Laboratory of Rolling and Automation， Northeastern University， Shenyang 110819， China; 2. School of Materials Science and Engineering， Jiangsu University of Science and Technology， Zhenjiang 212003， China.

Received:2016-02-29 Revised:2016-02-29 Online:2017-08-15 Published:2017-08-12
Contact: GAO Xiu-hua
About author:-
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Abstract

Abstract: Immersion experiment was carried out to investigate the corrosion behavior of armor layer steel immersed in a simulated seawater environment. The experimental results demonstrate that the microstructure of the designed steel is made of tempered martensite. Meanwhile， Cr-rich precipitated particles are observed in the substrate of the steel. Corrosion rate decreases with prolonging corrosion time， and the final corrosion rate is 0.0689mm·a^-1. The corrosion behavior can be divided into three stages: the fast decreasing stage， stable transitional stage and slow decreasing stage. The major corrosion products are α-FeOOH， γ-FeOOH， Fe₃O₄， and Fe₂O₃. With increasing corrosion time， the structure of corrosion products becomes more compact and their thickness is wider. Chromium element tends to accumulate in the corrosion products.

Key words: flexible pipe, armor layer, low-alloy steel, seawater, corrosion behavior

CLC Number:

TG172.5

LIU Zhen-guang， GAO Xiu-hua， DU Lin-xiu， LI Jian-ping. Corrosion Behavior of Armor Layer Steel of Flexible Pipes Exposed to Seawater Environment[J]. Journal of Northeastern University Natural Science, 2017, 38(8): 1088-1092.

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Corrosion Behavior of Armor Layer Steel of Flexible Pipes Exposed to Seawater Environment

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