Dew-Point Corrosion Behavior of 10# Carbon Steel inHCl-H2O Environment

doi:10.11902/1005.4537.2017.005

Journal of Chinese Society for Corrosion and protection

2018, Vol. 38

Issue (1): 33-38 DOI: 10.11902/1005.4537.2017.005

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Dew-Point Corrosion Behavior of 10^# Carbon Steel inHCl-H₂O Environment

Guofu OU, Lulu ZHAO, Kai WANG, Kuanxin WANG, Haozhe JIN(

)

Institute of Flow Induced Corrosion, Zhejiang Sci-Tech University, Hangzhou 310018, China

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Abstract

The influence of the pH value, impact velocity and impact angle of the corrosive medium (HCl droplet) on the dew point corrosion behavior of 10^# carbon steel in a simulated HCl-H₂O dew point corrosion environment of the atmospheric tower system was investigated by means of mass change measurement, scanning electron microscopy (SEM), X-ray diffraction (XRD). Results indicate that: the dew point corrosion rate of 10^# carbon steel increases with the impact velocity, and decreases with the increasing pH value and impact angle of HCl droplet, while a turning point of the dew point corrosion rate exists at the impact angle of 45°. The corrosion mode of 10# carbon steel in the HCl-H₂O environment is pitting corrosion, and there are many pits with different sizes and shapes on its surface, and Cl^- in the solution will deepen the pits. The main composition of corrosion product on 10^# carbon steel is α-FeOOH and Fe₂O₃.

Key words: 10^# carbon steel HCl-H₂O environment dew point corrosion SEM influence factor

Received: 09 January 2017

ZTFLH:

TQ026.5

Fund: Supported by Coal Joint Fund from Natural Science Foundation of China and Shenhua Group Corporation Limited(U1361107), National Key R&D Plan (2017YFF0210403), Zhejiang Provincial Natural Science Foundation of China (LY17E060008) and Talent Project of Zhejiang Association for Science and Technology (2017YCGC016)

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	Guofu OU
	Lulu ZHAO
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	Kuanxin WANG
	Haozhe JIN

Cite this article:

Guofu OU, Lulu ZHAO, Kai WANG, Kuanxin WANG, Haozhe JIN. Dew-Point Corrosion Behavior of 10^# Carbon Steel inHCl-H₂O Environment. Journal of Chinese Society for Corrosion and protection, 2018, 38(1): 33-38.

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https://www.jcscp.org/EN/10.11902/1005.4537.2017.005 OR https://www.jcscp.org/EN/Y2018/V38/I1/33

Fig.1 Simulation device sketch of dew point corrosion (1:nitrogen cylinder; 2: glass experiment box; 3: feeding bottle; 4: siderocradle; 5: nitrogen outlet; 6: nitrogen inlet; 7: speed control valve; 8: specimen; 9: angle adjuster; 10: height adjustment; 11: waste outlet)

Fig.2 Corrosion rates of 10^# carbon steel during hydrochl-oric dew-point corrosion as a function of pH value(θ=90°, impact velocity=3.01 m/s)

Fig.3 Hydrochloric dew-point corrosion rates of 10^# carbon steel at various impact angles (pH=2, impact velocity=3.01 m/s)

Fig.4 Hydrochloric dew-point corrosion rates of 10^# carbon steel at various impact velocities (pH=2, θ=90°)

Fig.5 Micro-morphology of corrosion product scale formedon 10^# carbon steel (pH=2, θ=90°, impact velocity=3.01 m/s)

Fig.6 XRD pattern of the corrosion scale formed on 10^# carbon steel (pH=2, θ=90°, impact velocity=3.01 m/s)

Fig.7 Surface micro-morphology of 10^# carbon steel after corrosion (pH=2, θ=90°, impact velocity=3.01 m/s) (a) and the magnified image of the circle area in Fig.7a (b)

Fig.8 Surface morphology of 10^# carbon steel after removing the corrosion scale formed under the test condition (pH=2, θ=90°, impact velocity=3.01 m/s) (a) and the magnified image of the circle area in Fig.8a (b)

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