Corrosion behavior of reheated CGHAZ of X80 pipeline steel in H2S-containing environments

被引：64

作者：

Zhao, Wei ^{[1
]}

Zou, Yong ^{[1
]}

Matsuda, Kenji ^{[2
]}

Zou, Zengda ^{[1
]}

机构：

[1] Shandong Univ, Key Lab Liquid Solid Struct Evolut & Processing M, Minist Educ, Jinan 250061, Peoples R China

[2] Toyama Univ, Grad Sch Sci & Engn Res, Toyama 9308555, Japan

来源：

MATERIALS & DESIGN | 2016年 / 99卷

基金：

中国国家自然科学基金;

关键词：

Reheated coarse-grained heat-affected zone; Hydrogen sulfide; Corrosion; Electrochemical; HEAT-AFFECTED ZONE; MICRO-ELECTROCHEMICAL CHARACTERIZATION; MARTENSITE-AUSTENITE CONSTITUENTS; NEUTRAL PH SOLUTION; LOW-ALLOY STEEL; 90; DEGREES-C; MECHANICAL-PROPERTIES; HYDROGEN-SULFIDE; TUBE STEEL; H2S ENVIRONMENTS;

D O I：

10.1016/j.matdes.2016.03.036

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Microstructure evolution and hydrogen sulfide (1-125) corrosion behavior in 5 wt% NaCl solution at 55 degrees C of X80 pipeline steel reheated coarse-grained heat-affected zone (CGHAZ) have been studied. Results showed that a microstructure gradient in reheated CGHAZ was generated because of the different peak temperatures in the subsequent welding thermal cycle. The size, fraction, shape and distribution of the secondary phase, martensite/austenite (M/A) constituents, in base metal, CGHAZ and reheated CGHAZ are different. A series of changes of corrosion products formed on the surface of X80 steel can be seen as the immersion process developed which affect the further corrosion behavior. Electrochemical results and corrosion morphologies in H2S environment showed that the base metal has the best corrosion resistance, and almost no holes and cracks exist in the corrosion products formed on the surface of base metal. The intercritically reheated CGHAZ has the lowest corrosion resistance because of the coarse necklace-shaped M/A constituents. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：44 / 56

页数：13

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