Galvanic Corrosion of Aircraft Components in Atmospheric Environment

doi:10.11902/1005.4537.2019.202

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (5): 455-462 DOI: 10.11902/1005.4537.2019.202

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Galvanic Corrosion of Aircraft Components in Atmospheric Environment

DING Qingmiao, QIN Yongxiang(

), CUI Yanyu

College of Airport, Civil Aviation University of China, Tianjin 300300, China

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Abstract

7050 Al-alloy is often used for medium and heavy plate extrusions as aircraft components. Based on large-scale simulation software COMSOL Multiphysics, a corrosion simulation model for the galvanic couple of 7050 Al-alloy and AerMet100 steel in atmospheric environment is established. The effect of salt deposits on the surface of galvanic couple, the relative humidity of atmospheric environment, and the area ratio of the anode to the cathode on the corrosion behavior was investigated respectively. The results show that the corrosion rate is the fastest when the relative humidity of the atmosphere is 0.91. When the surface salt deposits exceeds 5.7 g/m², severe corrosion will occur. Changing the ratio of cathode to anode will not cause the electrode polarity reversal. The corrosion rate of 7050 Al-alloy are positively correlated with the salt deposits and the area ratio of cathode to anode.

Key words: 7050 Al-alloy AerMet100 steel COMSOL atmospheric galvanic corrosion

Received: 13 November 2019

ZTFLH:

TG174

Fund: Tianjin Graduate Research and Innovation Project(2019YJSS069);Basic Scientific Research Service Fee of Central University of Civil Aviation University of China(3122019107)

Corresponding Authors: QIN Yongxiang E-mail: 550462668@qq.com

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Cite this article:

DING Qingmiao, QIN Yongxiang, CUI Yanyu. Galvanic Corrosion of Aircraft Components in Atmospheric Environment. Journal of Chinese Society for Corrosion and protection, 2020, 40(5): 455-462.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2019.202 OR https://www.jcscp.org/EN/Y2020/V40/I5/455

Fig.1 7050 aluminum alloy substrate—AerMet100 steel bolt connection model

Fig.2 3D model simplification method

Fig.3 Two-dimensional axisymmetric model

Fig.4 Schematic diagram of the current flow of the microcell

Fig.5 Relationship between electrolyte physical properties and atmospheric relative humidity: (a) conductivity vs relative humidity, (b) oxygen diffusion coefficient vs relative humidity, (c) amount of dissolved oxygen vs relative humidity

Fig.6 Relationship between liquid film thickness and atmospheric relative humidity

Fig.7 Cloud diagram of electrolyte current density distribution (r⁼¹⁰⁾

Fig.8 Cloud diagram of electrode surface potential (r⁼¹⁰⁾

Fig.9 Cloud diagram of electrolyte current density distribution

Fig.10 Maximum corrosion depth of 7050 aluminum alloy

Fig.11 Total current density on the electrode surface: (a) RH=0.79, (b) RH=0.85, (c) RH=0.91, (d) RH=0.97

Fig.12 Variation of maximum current density of paired contacts with humidity

Fig.13 Variation of maximum corrosion depth of 7050 aluminum alloy with humidity

Fig.14 Cloud diagrams of electrolyte current density distribution at different cathode/anode area ratios: (a) r^{=2 mm, (b) r^{=4 mm, (c) r^{=6 mm, (d) r^{=8 mm, (e) r^{=10 mm, (f) r^{=12 mm}}}}}}

Fig.15 Electrode potential of BC segment at different bolt head radius

Fig.16 Surface current density of BC segment electrode under different bolt head

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