Numerical Simulation of Galvanic Corrosion for Couple of Ti-alloy with Cu-alloy in Seawaters

doi:10.11902/1005.4537.2017.113

Journal of Chinese Society for Corrosion and protection

2018, Vol. 38

Issue (4): 403-408 DOI: 10.11902/1005.4537.2017.113

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Numerical Simulation of Galvanic Corrosion for Couple of Ti-alloy with Cu-alloy in Seawaters

Zhenhua WANG¹(

), Yang BAI^1,², Xiao MA¹, Shaohua XING¹

1 State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute,Qingdao 266101, China
2 College of Mechanical and Electrical Engineering, University of China Petroleum (East China), Qingdao 266580, China

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Abstract

The galvanic corrosion for the couple of TA2 Ti-alloy and Cu-Ni alloy, which was adopted typically for seawater pipeline of ship, was numerically simulated by means of the numerical simulation technique based on the boundary element method. In the meanwhile, the measured potentiodynamic polarization curves of Ti-alloy and Cu-alloy in static and flow seawater are used as reference as the boundary conditions for the numerical simulation. The following items are mainly concerned in the numerical simulation, namely the distributions of galvanic corrosion potential and the galvanic corrosion current density corresponding to the given parameters such as varying pipe radius, medium velocity and insulation grade etc. The results showed that the most severe corrosion area emerged in the place, where the two electrodes directly connected for the couple system of TA2 and B10 (area ratio 1:1), with a corrosion severity of about 4 times of that appeared in the case of natural corrosion. The galvanic corrosion rate shows a positive correlation with the pipe diameter and the media velocity.

Key words: Ti-alloy Cu-alloy seawater piping galvanic corrosion numerical simulation

Received: 13 July 2017

ZTFLH:

TG174.461

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	Zhenhua WANG
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Cite this article:

Zhenhua WANG, Yang BAI, Xiao MA, Shaohua XING. Numerical Simulation of Galvanic Corrosion for Couple of Ti-alloy with Cu-alloy in Seawaters. Journal of Chinese Society for Corrosion and protection, 2018, 38(4): 403-408.

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https://www.jcscp.org/EN/10.11902/1005.4537.2017.113 OR https://www.jcscp.org/EN/Y2018/V38/I4/403

Table 1 Chemical compositions of B10 Cu-alloy and TA2 Ti-alloy (mass fraction / %)

Fig.1 Schematic diagram of flow channel dynamic medium electrochemical measurement device

Fig.2 Micro-unit of corrosion system

Fig.3 Typical tube-tube boundary element model: (a) computational size model, (b) finite element mesh model

Fig.4 Polarization curves of B10 alloy (a) and TA2 titanium alloy (b) under different conditions

Table 2 Electrochemical parameters of B10 copper-nickel alloy and TA2 titanium alloy

Fig.5 Coupling potential distribution for seawater pipeline in static seawater

Fig.6 Variations of potential (a) and current density (b) with pipeline axial distance in galvanic corrosion process (c =78 mm, static)

Fig.7 Variations of potential (a) and current density (b) with pipeline diameter in galvanic corrosion process

Fig.8 Coupling potential distribution of seawater pipeline at 0 m/s (a), 1 m/s (b) and 3 m/s (c) seawater velocities

Fig.9 Comparison of variations of galvanic corrosion current density of seawater pipeline with axial distance in static/dynamic seawater conditions

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