Cyclic Corrosion Behavior of E36 Low-alloy Steel in a Simulated Cargo Oil Tank Upper Deck Environment Corresponding to IMO Standard

doi:10.11901/1005.3093.2014.106

Chinese Journal of Materials Research

2014, Vol. 28

Issue (6): 433-442 DOI: 10.11901/1005.3093.2014.106

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Cyclic Corrosion Behavior of E36 Low-alloy Steel in a Simulated Cargo Oil Tank Upper Deck Environment Corresponding to IMO Standard

Jinming LIANG,Di TANG,Huibin WU(

),Yuanjie YUE

National Engineering Research Center of Advanced Rolling Technology, University of Science and Technology Beijing, Beijing 100083

Cite this article:

Jinming LIANG,Di TANG,Huibin WU,Yuanjie YUE. Cyclic Corrosion Behavior of E36 Low-alloy Steel in a Simulated Cargo Oil Tank Upper Deck Environment Corresponding to IMO Standard. Chinese Journal of Materials Research, 2014, 28(6): 433-442.

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Abstract

The full-system cycle corrosion behavior of E36 grade low-alloy steel was studied by a homemade device to simulate the cargo oil tank upper deck corrosion environment which was established corresponding to the international maritime organization standard. The corrosion rate and reduction of thickness of the steel were measured respectively, and an extrapolation of the thickness reduction for 25 years corrosion was calculated by fitting formula and curve. Surface morphology of steel tested for different cycles before and after the removal of corrosion product films was observed by scanning electron microscope (SEM). The distribution of element and phase constituent of corrosion product film were analyzed by energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) respectively. The results showed that the extrapolation of thickness reduction for 25 years corrosion was 2.21 mm. In the early stage of the corrosion, acid condensing droplets were formed on the surface of corrosion product film due to the existence of sour gas and the alternating temperature and humidity, and then the corrosion scale was gradually blistered. In the later stage of the corrosion, the size of the blisters grew up, and then most of which cracked and falled off. At last, the outer corrosion scale was completely detached, and the inner corrosion product scale was exposed to the corrosive environment. The rather loose outer corrosion scale of the steel formed in wet O₂-CO_2-SO₂-H₂S gas environment was mainly consisted of α-FeOOH, γ-FeOOH, S, FeS₂, Fe_1-_xS and FeS. However the rather compact inner corrosion product scale was consisted mainly of α-FeOOH.

Key words: metallic materials cargo oil tank IMO standard low-alloy steel upper deck full-system cycle corrosion behavior corrosion mechanism corrosion product film

Received: 27 February 2014

Fund: *Supported by National Science and Technology Major Project No.2011ZX05016-004 and National Key Technology Research and Development Program No.2011BAE25B00.

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.106 OR https://www.cjmr.org/EN/Y2014/V28/I6/433

Table 1 Mechanical properties of E36 steel and test steel

Fig.1 OM (a) and SEM (b) images of test steel

Fig.2 Simulated corrosion test apparatus for upper deck of cargo oil tank, (a) reaction chamber, (b) specimen fixture

Table 2 Corrosion results in simulated cargo oil tank upper deck environment

Fig.3 Average corrosion rate of test steel after different corrosion cycle

Table 3 Fitting results of the electrochemical parameters of test steels

Fig.4 Fitted curve and formula of average thickness reduction after corrosion test

Fig.5 Corrosion morphologies of test steel with different corrosion cycle before and after removing corrosion scale, (a) 21 d before removing corrosion scale, (b, c) 21 d after removing corrosion scale, (d) 49 d before removing corrosion scale, (e, f) 49 d after removing corrosion scale, (g) 77 d before removing corrosion scale, (h, i) 77 d after removing corrosion scale, (j) 98 d before removing corrosion scale, (k, l) 98 d after removing corrosion scale

Fig.6 Polarization curves of test steels with different corrosion cycle in simulated corrosion environment

Fig.7 EIS equivalent circuit for test steels in simulated corrosion environment

Fig.8 Nyquist plots of test steels with different corrosion cycle in simulated corrosion environment

Fig.9 Corrosion micro-morphologies of corrosion scale on test steel with different corrosion cycle, (a) 21 d, (b) 49 d, (c) 77 d, (d) 98 d

Fig.10 Cross-sectional morphologies of corrosion scale with different corrosion cycle, (a) 21 d, (b) 49 d, (c) 77 d, (d) 98 d

Fig.11 XRD patterns of corrosion products film of test steel with different corrosion cycle

Fig.12 Corrosion micro-morphology and EDS analysis of corrosion scale on test steel after 49 d corrosion, (a, b) corrosion micro-morphology, (c) EDS pattern, (d) Fe EDS analysis, (e) O Fe EDS analysis, (f) S Fe EDS analysis

Fig.13 Corrosion mechanism schematic diagram of low-alloy steel on COT upper deck environment

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