摘要
高炉煤气输送管道通常采用普碳钢,而煤气管道中含有硫酸、硝酸和氯离子等多种腐蚀性介质,对管道造成腐蚀,管道使用寿命低。针对研发的煤气管道用耐酸钢,采用均匀腐蚀全浸试验对其硫酸腐蚀行为进行了研究,利用扫描电镜(SEM)、电子探针(EPMA)、激光共焦扫描显微镜(LSCM)等手段揭示其腐蚀行为。结果表明,煤气管道用耐酸钢有优异的耐硫酸腐蚀性能;Cu、Sb、Cr等耐腐蚀元素的加入有利于改善点蚀现象,并在耐酸钢表面形成一层致密的不溶于硫酸的富含Cu、Sb、Cr等元素的钝化膜,从而增强耐酸钢的耐硫酸腐蚀性能;适量的S元素含量有利于提高钢的耐硫酸腐蚀性能。
The blast furnace gas pipeline usually uses ordinary carbon steel,and the gas pipeline contains various corrosive media,such as sulfuric acid,nitric acid and chloride ions,which cause corrosion to the pipeline and the pipeline has a low service life.The acid-resistant steel developed for gas pipelines,the uniform corrosion total immersion test was used to study its sulfuric acid corrosion behavior,and the scanning electron microscope(SEM),electron probe(EPMA),laser confocal scanning microscope(LSCM)and other methods were used to reveal its corrosion behavior.The resarch show that the acid-resistant steel for gas pipelines has excellent sulfuric acid corrosion resistance;the addition of corrosion-resistant elements,such as Cu,Sb,and Cr is beneficial to improve pitting-resistance property,and forms a dense passivation film which is insoluble in sulfuric acid and rich in Cu,Sb,Cr on the surface of acid resistant steel,thereby enhancing the sulfuric acid corrosion resistance of acid-resistant steel;an appropriate amount of S element content is beneficial to improve the sulfuric acid corrosion resistance.
作者
邱志永
胡学文
高秀华
石践
吴红艳
于驰
QIU Zhiyong;HU Xuewen;GAO Xiuhua;SHI Jian;WU Hongyan;YU Chi(State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China;Technical Center,Maanshan Iron and Steel Co.,Ltd.,Maanshan 243000,China;School of Resources and Materials,Northeastern University,Qinhuangdao 066004,China)
出处
《轧钢》
2021年第1期26-30,35,共6页
Steel Rolling
关键词
耐酸钢
煤气管道
均匀腐蚀
硫酸腐蚀
电子探针
点蚀
S元素含量
钝化膜
acid-resistant steel
gas pipeline
uniform corrosion
sulfuric acid corrosion
electron probe
pitting corrosion
S element content
passivation film
