Influence of Spreadability of Seawater Droplet on Electrochemical Characteristics of Carbon Steel

doi:10.11901/1005.3093.2014.347

Chinese Journal of Materials Research

2015, Vol. 29

Issue (2): 95-100 DOI: 10.11901/1005.3093.2014.347

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Influence of Spreadability of Seawater Droplet on Electrochemical Characteristics of Carbon Steel

Ran XU,Yanhua WANG(

),Jia WANG,Zaijian LIU,Yuan ZHANG

Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China

Cite this article:

Ran XU,Yanhua WANG,Jia WANG,Zaijian LIU,Yuan ZHANG. Influence of Spreadability of Seawater Droplet on Electrochemical Characteristics of Carbon Steel. Chinese Journal of Materials Research, 2015, 29(2): 95-100.

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Abstract

Corrosion behavior of carbon steel beneath seawater droplets was investigated by using the wire electrode technique (WBE). It was found that anodic and cathodic current decreased gradually with the increasing time, then eventually kept stable. Furthermore, the current distribution over the WBE surface beneath seawater droplets of different sizes was studied. Beneath a smaller droplet, the carbon steel was more easily to form an asymmetric electrochemical area. In addition, a concept of droplet spreadability was defined. The average current density increased exponentially with the increasing droplet spreadability, the maximum value and the standard deviation of the anodic current density increased linearly, at the same time, the corrosion intensity enhanced.

Key words: failure and protection of material atmospheric corrosion wire beam electrode spreadability

Received: 13 July 2014

Fund: *Supported by National Natural Science Foundation of China Nos.51131005 ＆ 40906039; Award Fund for Young and Middle-aged Scientisits of Shandong No.BS2012HZ021; Natural Science Foundation of Shandong No.ZR2010DQ006.

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	Ran XU
	Yanhua WANG
	Jia WANG
	Zaijian LIU
	Yuan ZHANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.347 OR https://www.cjmr.org/EN/Y2015/V29/I2/95

Fig.1 Photo of the WBE surface (a) and the schematic diagram of test device (b)

Fig.2 Galvanic current distributions over the WBE surface with a drop of 50μL volume of seawater solution after (a) 10 min, (b) 30 min, (c) 60 min, (d) 90 min, (e) 180 min, (f) 300 min

Fig.3 Variations of the average anodic current density i_a with corrosion timeunder 50 μL seawater droplet

Fig.4 Galvanic current distributions over the WBE surface under theseawater droplet with different volume (a) 10 μL, (b) 25 μL, (c) 50 μL, (d) 100 μL, (e) 150 μL

Fig.5 Variations of the Spreadability A₀ with the volume of seawater droplet

Fig.6 Variations of the average current density i with the spreadability A₀ of seawater droplet

Fig.7 Variations of the maximum anodic current density i_{a, max}with the Spreadability A₀ of seawater droplet

Fig.8 Variations of the standard deviation of the anodic current densityS with the Spreadability A₀ of seawater droplet

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