In this work, the corrosion behavior of marine engineering materials in three typical harsh marine atmospheric environments is investigated i.e., the so called "Antarctic low-temperature and high-irradiation ice-snow freezing-melting environment", "high-temperature, high-humidity and high-salt fog atmospheric environment of South China Sea", and "coastal chlorine-haze coupling environment". The results show that in Antarctic environment, the electrochemical corrosion process can occur even beneath the cover of snow and ice at extremely low temperature. The freezing-melting process of ice and snow leads to the existence of surface electrolyte film for a long period, which promotes the corrosion reactions and accelerates the localized corrosion. In the environment of the South China Sea, there is a synergistic effect of chemical oxidation and electrochemical corrosion on the surface of non-ferrous materials in high humidity and high Cl- atmospheric environment at high temperature. Different aluminum alloys have different corrosion initiation and propagation driving forces (i.e., diffusion and charge transfer, hydrogen-induced intergranular cracking, and wedging effect of corrosion products). The synergistic effect of time of wetness (TOW) and Cl- content lead to the deviation of corrosion dynamics from the power function. In the coastal chlorine-haze coupling environment, the key controlling factor of NH4+ in acceleration of corrosion in the chlorine-haze environment is the continuous supply of H+ caused by the buffering effect of NH4+. Meanwhile,“quasi auto-catalytic pitting” corrosion occurs because of the synergistic effect of Cl-, NO3-, and NH4+.
Fund: Fundamental Research Funds for the Central Universities(201762008);National Science and Technology Resources Investigation Program of China(2019FY101400)
Corresponding Authors:
CUI Zhongyu
E-mail: cuizhongyu@ouc.edu.cn
CUI Zhongyu, GE Feng, WANG Xin. Corrosion Mechanism of Materials in Three Typical Harsh Marine Atmospheric Environments. Journal of Chinese Society for Corrosion and protection, 2022, 42(3): 403-409.
Fig.1 Macroscopic corrosion morphologies of the skyward (a) and backward (b) surfaces of Q235 steel sample after exposure in Zhongshan Station of the South Pole for 1 month, corrosion product morphology (c), pitting morphology (d), Raman analysis of the corrosion products (e), surface profile (f) and depth distributions (g, h)
Fig.2 Temperature cyclic range (a) and corrosion rate of Q235 steel in the laboratory tests (b)
Fig.3 Mass loss (a), pit depth variation (b) of AZ31 Mg-based alloy during exposure in Xisha marine atmosphere, and cross-sectional morphology and element mappings (c) of the corrosion product layer formed on pure Zn after exposure for 4 a[14,16]
Fig.4 Macroscopic corrosion morphologies of AZ31 Mg-based alloy after immersion for 24 h in 0.1 mol/L NaCl solutions containing different concentrations of NH4NO3[24]
Fig.5 Schematic diagrams of the corrosion process of AZ31 Mg-based alloy in 0.1 mol/L NaCl solutions with low (a), medium (b) and high (c) concentrations of NH4NO3
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