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电化学(中英文) ›› 2004, Vol. 10 ›› Issue (4): 435-439. 

• 研究论文 • 上一篇    下一篇

渗铝钢在海水中的电化学行为研究

梁成浩,魏君,路思,郑润芬   

  1. 大连理工大学化工学院,中国石油大连石化公司设备研究室,中国石油大连石化公司设备研究室,大连理工大学化工学院 辽宁大连116012 ,辽宁大连116032 ,辽宁大连116032 ,辽宁大连116012
  • 收稿日期:2004-11-28 修回日期:2004-11-28 出版日期:2004-11-28 发布日期:2004-11-28

Electrochemical Behavior of Aluminized Steel in Seawater Environment

LIANG Cheng-hao~   

  1. (*1), WEI Jun~2, LU Si~2, ZHENG Run-fen~(1)(1. School of Chemical Engineering, Dalian University of Technology, Dalian 116012, China,2. Equipment Institute of PetroChina Company Limited Dalian Petrochemical Company,Dalian 116012,China
  • Received:2004-11-28 Revised:2004-11-28 Published:2004-11-28 Online:2004-11-28

摘要:  应用化学浸泡实验,电化学测试技术研究渗铝钢在海水中的电化学行为.试验表明,在海水中渗铝钢的腐蚀电位比20#钢的负,其阳极活性大于后者,在低电位下发生阳极溶解.20#钢和渗铝钢的腐蚀速率分别为5.80mg/dm2·d和3.36mg/dm2·d.渗铝钢在海水中具有优良的耐蚀性能是由于环境遮断和电偶保护的综合效果.其腐蚀产物含有氯离子,说明氯离子参与海水中的腐蚀过程,是导致腐蚀的主要原因.渗铝钢除了表层形成的Al、Fe化合物和致密、连续、具有高效防护作用Al的氧化物保护膜外,Al Fe合金层起到牺牲阳极的电化学保护作用.

关键词: 海水, 渗铝钢, 电化学行为

Abstract: The electrochemical behavior of aluminized steel in seawater has been studied by immersion test and electrochemical technology. The results indicate that compared with 20# steel, the aluminized steel has lower corrosion potential and stronger anodic activity in seawater. Its anodic solution will occur at low potential. The immersion test shows that the corrosion rates of aluminized steel and 20# steel are 5.80 mg/dm~2 dand 3.36 mg/dm~2 d, respectively. Through the X-ray diffraction patternanalysis, it was found that chloride ions exit in the corrosion products of aluminized steel. It proves the participation of chloride ions in the process of corrosion, which are the main reason resulting in the corrosion. The research reveals that Aluminized steel's excellent corrosion resisting property in seawater is attributed to the combined action of the shutoff on the surface and couple protection. Besides the compact and uniform films of Al-Fe compound and the oxide of Al formed on the aluminized steel's surface, the aluminized layer as sacrificial anode can also protect the matrix.

Key words: Seawater, Aluminized steel, Electrochemical behavior

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