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| PHYSICAL CHEMISTRY OF IRON RUST Ⅱ. STUDY OF THE BARRIER LAYER RUST FORMED ON LOW ALLOY STEELS IN IMITATIVE SEA WATER BY CONVERSION ELECTRON MǒSSBAUER SPECTROSCOPY |
| Chen Junming Wang Zhijie Cai Zhenyue Wang Caihu and Zhang Houzeng (Shanghai Institute of Metallurgy; Academia Sinica) Yu Fanghua and Hu Wenxiang (Shanghai Institute of Nuclear Research; Academia Sinica) |
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Abstract Potentiostatic anodic polarization of low alloy steels in 3.5%NaCl solution can be used to imitate the electrochemical process of local micropits formed on these steels while corroding in sea water. The relative amount of the intermediate phase occuring in micropits may be increased by this accelerated test method. This micro intermediate product has been detected by the use of Mossbauer effect, so that we can determine the true composition of the barrier layer rust formed on low alloy steels in sea water, which could not be determined directly in sea water previously. Experimental results show that different low alloy steels possess different phase composition of the barrier layer rust. In addition to the final state phases, β-,γ-FeOOH, which were found in all the samples after corroding in sea water, there are also microcrystalline or amorphous intermediate, state iron rusts of different composition—similar to green Rust I, Fe_2(OH)_3Cl etc. These intermediate state rusts tend very easily to oxidize, dehydrate and age in the atmosphere. They will transform step by step to the final state phases such as FeOOH or Fe_3O_4 or both depending on conditions. While these intermediate phases were growing locally in the barrier layer rust, corrosion resistance of the alloy may be decreased. In Ni-or Cr-containing low alloy steels, the formation of some intermediate, phases in the early stage is inhibited, but the formation of other intermediate phases in the later stage can be promoted. Therefore, Ni-,Cr-containing low alloy steels show good corrosion resistance in the early stage, but bad corrosion resistance in the later stage. According to Mossbauer spectroscopy and corrosion electrochemistry,suggestions for developing and evaluating corrosion resistant low alloy steels in sea water are made.
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Received: 25 April 1982
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Cite this article:
Chen Junming Wang Zhijie Cai Zhenyue Wang Caihu and Zhang Houzeng (Shanghai Institute of Metallurgy; Academia Sinica) Yu Fanghua and Hu Wenxiang (Shanghai Institute of Nuclear Research; Academia Sinica). PHYSICAL CHEMISTRY OF IRON RUST Ⅱ. STUDY OF THE BARRIER LAYER RUST FORMED ON LOW ALLOY STEELS IN IMITATIVE SEA WATER BY CONVERSION ELECTRON MǒSSBAUER SPECTROSCOPY. J Chin Soc Corr Pro, 1982, 2(2): 10-19.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1982/V2/I2/10
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