摘要
N80钢级HFW焊管焊缝的耐蚀性是影响其使用寿命的重要因素。采用微电极扫描法、电化学自腐蚀电位法,研究N80钢级HFW焊管焊缝焊态和热处理后的电化学性能。分析认为:相较于焊态,热处理后的N80钢级HFW焊管,其焊缝区和母材区的电流密度分布更均匀、电位差更小,组织均匀性更好;沟槽腐蚀敏感性系数由焊态的1.32降至1.21,沟槽腐蚀发生概率降低。
The corrosion resistance of N80 HFW welded pipe is an important parameter which affects its service life. The electrochemical properties of the weld joint of the N80 HFW welded pipe under the weld condition and after heat treatment are studied by means of the microelectrode scanning method and the electrochemical self-corrosion potential method. The results show that, compared to the as-welded N80 HFW pipe, the N80 HFW pipe as-heat treated has such advantageous electrochemical properties as more uniform distribution of current density, smaller potential difference, and better microstructure homogeneity both in the weld zone and base metal zone; and the sensitivity coefficient of grooving corrosion is reduced from 1.32 under the weld condition to 1.21 after heat treatment so that the chances of occurrence of grooving corrosion is reduced.
出处
《钢管》
CAS
2017年第5期34-37,共4页
Steel Pipe
基金
国家科技支撑计划:高强度耐腐蚀石油天然气集输与输送用管线钢生产技术(2011BAE25B03)
关键词
HFW焊管
电化学极化法
微电极扫描法
电流密度
HFW welded pipe
electrochemical polarization
microelectrode scanning
current density
