Journal of South China University of Technology (Natural Science Edition) ›› 2017, Vol. 45 ›› Issue (9): 135-141.doi: 10.3969/j.issn.1000-565X.2017.09.019

• Materials Science & Technology • Previous Articles     Next Articles

Evolution of Corrosion Products of Carbon Steels and Galvanized Steel in Simulated Marine Atmosphere

GAO Yan1 HUANG Yin-hui1 MENG Xiao-bo2 LIAO Yong-li2 LI Rui-hai2   

  1. 1.School of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China; 2.Electric Power Research Institute,CSG,Guangzhou 510080,Guangdong,China
  • Received:2016-12-14 Revised:2017-01-04 Online:2017-09-25 Published:2017-08-30
  • Contact: 高岩( 1962-) ，女，博士，教授，主要从事金属腐蚀与多孔形状记忆合金研究． E-mail:meygao@scut.edu.cn
  • About author:高岩( 1962-) ，女，博士，教授，主要从事金属腐蚀与多孔形状记忆合金研究．
  • Supported by:
    Supported by the National Natural Science Foundation of China( 51471072)

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Abstract: In order to investigate the evolution of the composition and form of steel corrosion products with time in simulated marine atmosphere,Q235,Q345 and galvanized Q235 steels were exposed in neutral salt spray boxes for 2,6,24,48,144,240,360h.Then,the corrosion rates were calculated via the weight loss method,and the corrosion products were characterized by means of XRD and SEM.The results show that ( 1) the corrosion kinetics curves of the three kinds of steels follow the bilogarithmic equation; ( 2) the galvanized Q235 steel has a much lower corrosion rate than Q235 and Q345 steels,while the corrosion rate of Q235 steel is close to that of Q345 steel; ( 3) the corrosion products forming on Q235 and Q345 steels are mainly α-FeOOH,β-FeOOH,γ-FeOOH and Fe3O4 ,and the change rules of these products with the spraying time are different; ( 4) different corrosion products exhibit different topographic characteristics,specifically,γ-FeOOH ,β-FeOOH and less reported Fe3O4 are respectively flower-like,cotton ball-like and spinelle-like; and ( 5) as compared with the two kinds of carbon steels,the galvanized Q235 steel has a more compact rust layer.

Key words: low carbon steel, galvanized steel, salt spray test, corrosion product, corrosion morpholog

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