Corrosion Behavior of Cr Bearing Weathering Steel in Simulated Marine Atmosphere

doi:10.11902/1005.4537.2016.013

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

Issue (2): 93-100 DOI: 10.11902/1005.4537.2016.013

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Corrosion Behavior of Cr Bearing Weathering Steel in Simulated Marine Atmosphere

Piaopiao ZHANG,Zhongmin YANG(

),Ying CHEN,Huimin WANG

Structural Steel Institute, Central Iron and Steel Research Institute, Beijing 100081, China

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Abstract

Three different low alloy steels 1Cr-0.5Al-0.3Mo, 5Cr-0.4Ni-0.3Cu and 10Cr-0.3Ni were designed, then taking steel 20MnSi as a reference, their corrosion behavior was comparatively investigated in simulated marine atmosphere by means of periodic immersion accelerated corrosion test and electrochemical test, as well as XRD, SEM and EDS etc. In addition, electrochemical performance of the formed rust layer was assessed. The results showed that the corrosion rate of the test steels was decreased with the increasing Cr content, the formed rusts of the steels with 1% and 5%Cr composed of two layers with an inner layer of alternating band-like structure with Cr enriched sub-layers and Cr depleted sub-layers. While the steel with 10%Cr was passivated during the test. Besides, with the extending corrosion time, the corrosion rate of the steel with 5%Cr firstly increased and then stabilized, but it kept very low level for the steel with 10%Cr, and it decreased for the steel 20MnSi. Cr enhanced the free-corrosion potential and charge transfer resistance of the steels, thereby improved the compactness of the formed rusts.

Key words: weathering steel chromium content corrosion resistance marine atmospheric environment

Received: 13 January 2016

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Cite this article:

Piaopiao ZHANG,Zhongmin YANG,Ying CHEN,Huimin WANG. Corrosion Behavior of Cr Bearing Weathering Steel in Simulated Marine Atmosphere. Journal of Chinese Society for Corrosion and protection, 2017, 37(2): 93-100.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.013 OR https://www.jcscp.org/EN/Y2017/V37/I2/93

Table 1 Chemicl compositions of tested steels (mass fraction / %)

Fig.1 Average corrosion rate (a) and relative corrosion resistance (b) of four experimental steels after periodic immersion for 72 h

Fig.2 Corrosion rates of tested steels during periodicimmersion for 216 h

Fig.3 Macro-morphologies of the surfaces of 1R (a), 2R (b), 3R (c) and 20MnSi (d) steels after periodicimmersion for 72 h

Fig.4 Micro-morphologies of the surfaces of 1R (a), 2R (b), 3R (c) and 20MnSi (d) steels after periodicimmersion for 72 h

Fig.5 SEM cross-section images of the rust layers formed on 1R (a), 2R (b), 3R (c) and 20MnSi (d)steels after periodic immersion for 72 h

Fig.6 Cross section images and element distributions of the rust layers of 2R (a, b) and 1R (c) steels

Fig.7 XRD spectra (a) and semi-quantitative constitutes (b) of the rust layers formed after periodic immersion for 72 h

Table 2 Fitting parameters of polarization curves and EIS of four bare steels

Fig.8 Polarization curves (a) and EIS (b) of four bare steelsin 0.5%NaCl solution

Fig.9 Polarization curves of rusted steels subjected to periodic immersion for 72 h

Fig.10 EIS of rusted 1R, 2R and 20MnSi (a) and 3R (b) steels subjected to periodic immersion for 72 h in 0.5%NaCl solution

Fig.11 Equivalent circuit of rusted steels after periodic immersion for 72 h in 0.5%NaCl solution

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