Effect of Moistened Electrical Insulation on Galvanic Corrosion Behavior of Dissimilar Metals

doi:10.11902/1005.4537.2016.136

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

Issue (2): 175-182 DOI: 10.11902/1005.4537.2016.136

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Effect of Moistened Electrical Insulation on Galvanic Corrosion Behavior of Dissimilar Metals

Xin ZHAO¹,Yulong HU¹(

),Fu DONG¹,Xiaodong ZHANG²,Zhiqiao WANG¹

1 College of Science, Naval University of Engineering, Wuhan 430033, China
2 Office of Research & Development, Naval University of Engineering, Wuhan 430033, China;

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Abstract

The effect of moistened electrical insulation on galvanic corrosion behavior of dissimilar metals was investigated with a simulated galvanic corrosion setup, which consisted of a cell containing 3%NaCl solution with hull steel and cupronickel as electrodes and then by series connecting resistance elements or moistened insulation materials into the circuit. The results showed that through moistening the insulation material can be transformed into electrical conducting material. The resistance of moistened insulation material (R_m) may involve ionic resistance (R_i) and electrical resistance (R_e), which are produced respectively by ionic conducting and electrical conducting. The corrosion behavior of the hull steel for the couple steel/cupronickel beneath a moistened insulation material may relate to the term R_e. When R_e is not higher than 1 kΩ, the galvanic current of the couple connected with a resistance element of a moistened insulation material may higher than that of the short-circuited couple, and the corrosion rates of hull steel of the couples connected with resistance elements may higher than that the short-circuited couple. When R_e is higher than 1 kΩ, the galvanic currents of the couples connected with resistance elements decreased with the increase of R_e, whilst the corrosion rate of the hull steel of the couples connected with resistance elements decreased with the increase of R_e. The conduction of the moistened insulation material related to the nature of insulation material, the key to prevent galvanic corrosion of couple hull steel/cupronickel is the appropriate selection of insulation material.

Key words: galvanic corrosion treatment of electrical insulation moistened insulation material electrical resistance

Received: 31 August 2016

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	Xin ZHAO
	Yulong HU
	Fu DONG
	Xiaodong ZHANG
	Zhiqiao WANG

Cite this article:

Xin ZHAO,Yulong HU,Fu DONG,Xiaodong ZHANG,Zhiqiao WANG. Effect of Moistened Electrical Insulation on Galvanic Corrosion Behavior of Dissimilar Metals. Journal of Chinese Society for Corrosion and protection, 2017, 37(2): 175-182.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.136 OR https://www.jcscp.org/EN/Y2017/V37/I2/175

Table 1 Chemical compositions of low-alloy high strength steel (hull steel) and B10 alloy (mass fraction / %)

Fig.1 Schematic outline of resistance measurement ofmoistened insulation materials

Fig.2 Schematic outline of galvanic corrosion experiment device

Fig.3 Variations of water absorption rates of three insulation materials

Fig.4 Changes of resistances of three moistened insulationmaterials (R_m)

Fig.5 Changes of corrosion potentials of the couples containing series resistors: (a) hull steel, (b) B10 alloy

Fig.6 Potential difference (?E) of B10-hull steel couple as a function of series resistance

Fig.7 Changes of galvanic currents (I_g) of the couples containing different series resistors with time: (a) R≥1 kΩ, (b) R<1 kΩ

Fig.8 Stable galvanic current vs series resistance

Fig.9 EIS of hull steel in the couples containing series resistors after immersion for 48 h: (a) R≥1 kΩ, (b)R<1 kΩ

Table 2 Variations of potential difference (?E) of the couple and fitted polarization resistance (R_p) of hull steel with series resistance (R)

Fig.10 Changes of corrosion potentials of the couples containing moistened insulation materials with time: (a) hull steel, (b) B10

Fig.11 Changes of galvanic currents (I_g) of the couples containing moistened insulation materials with time

Fig.12 Equivalent circuit model of moistened insulation material

Fig.13 EIS of hull steel of the couples containing moistened insulation materials after immersion for 48 h

Table 3 Potential differences (?E) of the couples containing moistened insulation materials and fitted polarization resistances (R_p) of hull steel

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