Volume 39 Issue 8
Aug.  2013
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Yu Mei, Wang Ruiyang, Liu Jianhua, et al. Corrosion properties of two kinds of hull steels welding joints in simulated marine environments[J]. Journal of Beijing University of Aeronautics and Astronautics, 2013, 39(8): 1020-1025. (in Chinese)
Citation: Yu Mei, Wang Ruiyang, Liu Jianhua, et al. Corrosion properties of two kinds of hull steels welding joints in simulated marine environments[J]. Journal of Beijing University of Aeronautics and Astronautics, 2013, 39(8): 1020-1025. (in Chinese)

Corrosion properties of two kinds of hull steels welding joints in simulated marine environments

  • Received Date: 30 Aug 2012
  • Rev Recd Date: 29 Nov 2012
  • Publish Date: 30 Aug 2013
  • Corrosion properties of 10CrNi3MoV and 12MnSiNiCrMo welding joints were investigated by alternate immersion test, neutral salt spray test and constant load tensile stress corrosion test. These tests were designed to simulate circulatory soakage of seawater and marine atmosphere respectively. Dynamic polarization curves of the welding joints were tested too. Microstructures of the weld zone, heat affected zone and base metal were analyzed by metallographic technique. The results show that the weld zone is more liable to corrosion and more sensitive to fracture. The corrosion current density of weld zone is the biggest while the base metal is the smallest for both two welding joints. The corrosion resistance of 10CrNi3MoV is much better than 12MnSiNiCrMo. When the stress level is comparatively lower or higher, the welding joints of 12MnSiNiCrMo are more susceptible to stress corrosion cracking than 10CrNi3MoV. The corrosion current density of the welding joints of 12MnSiNiCrMo is much bigger than 10CrNi3MoV. Microstructure differences of different zones are the main reason. Proper amount of acicular ferrite maintains the obdurability corrosion resistance of base metal, but the resistance to corrosion and stress corrosion cracking is declined by superfluous ferrite in the weld zone.

     

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