Corrosion of simulated weld HAZ of API X-80 pipeline steel

被引：125
|
作者：
Mohammadi, Farzad [1 ]
Eliyan, Faysal Fayez [1 ]
Alfantazi, Akram [1 ]
机构：
[1] Univ British Columbia, Dept Mat Engn, Vancouver, BC V6T 1Z4, Canada
来源：
CORROSION SCIENCE | 2012年 / 63卷
基金：
加拿大自然科学与工程研究理事会;
关键词：
Low alloy steel; Welding; Polarisation; Acid corrosion; Alkaline corrosion; HEAT-AFFECTED ZONES; MICROSTRUCTURE; BEHAVIOR; FERRITE;
D O I：
10.1016/j.corsci.2012.06.014
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Four peak temperatures and two cooling rates were used in a Gleeble thermomechanical processing machine to simulate weld HAZ of API X-80 pipeline steel. Bainitic microstructures were observed at both 30 and 100 degrees C/s cooling rates. Bainite favoured higher passive current densities in alkaline solutions. The lowest peak temperature, 770 degrees C, produced the highest martensite-retained austenite (M-A) phase in the microstructure. Presence of M-A phases in the microstructure extended the passive region to higher potentials in alkaline solutions. Corrosion current density of the as-received sample was higher in acidic solutions and lower in alkaline solutions compared to the heat-treated ones. (C) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码：323 / 333
页数：11
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