Relationship Between Corrosion Failure Degree of Organic Coatings and Mechanical Properties for Dissimilar Metal Assamblies

doi:10.11902/1005.4537.2023.370

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (3): 679-690 DOI: 10.11902/1005.4537.2023.370

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Relationship Between Corrosion Failure Degree of Organic Coatings and Mechanical Properties for Dissimilar Metal Assamblies

LI Zhuoxuan¹, CAO Yanhui¹, LI Chongjie¹, LI Hui², ZHANG Xiaoming², YONG Xingyue¹(

)

1. State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
2. AVIC Xi'an Aircraft Design and Research Institute, Xi'an 710089, China

Cite this article:

LI Zhuoxuan, CAO Yanhui, LI Chongjie, LI Hui, ZHANG Xiaoming, YONG Xingyue. Relationship Between Corrosion Failure Degree of Organic Coatings and Mechanical Properties for Dissimilar Metal Assamblies. Journal of Chinese Society for Corrosion and protection, 2024, 44(3): 679-690.

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Abstract

As one of the most common methods for galvanic corrosion control, organic coating has wildly used in an aerospace field. However, the failure of organic coatings often leads to the deterioration of mechanical properties of the dissimilar metal assemblies. In this work, selected organic coatings were applied on plates of 300M steel, 2024, and 5A06 Al-alloy respectively, then which were coupled with Ti-alloy plate by different modes. Afterwards, the dissimilar metal assemblies were subjected to lab accelerated tests in conditions of hot-humid, with mucedine, and of salt-spray in succession. Then, the acquired test results were analyzed and a comprehensive evaluation model for organic coating failures was established according to the so-called “Analytic Hierarchy Process (AHP)”, and which was verified by the measured results of electrochemical impedance spectroscopy (EIS) of the above assmeblies after lab accelerated tests. Furthermore, the mechanical properties of the dissimilar metal assemblies were examined by using a universal tensile testing machine after accelerated tests, and so that the relationship between the failure degree of organic coatings and damage degree of mechanical property of the dissimilar metal assemblies was established. The results indicate that the tensile strength and fracture elongation of the assemblies decrease to a certain degree after accelerated tests, which depend on the coupling modes. Meanwhile, there is a significant negative correlation between the mechanical properties and the comprehensive evaluation values for the dissimilar metal assemblies.

Key words: coupled specimen accelerated test organic coating failure electrochemical impedance spectroscopy mechanical property

Received: 20 November 2023 32134.14.1005.4537.2023.370

ZTFLH:

TG174.46

Fund: National Natural Science Foundation of China(52171062)

Corresponding Authors: YONG Xingyue, E-mail: yongxy@mail.buct.edu.cn

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	LI Zhuoxuan
	CAO Yanhui
	LI Chongjie
	LI Hui
	ZHANG Xiaoming
	YONG Xingyue

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.370 OR https://www.jcscp.org/EN/Y2024/V44/I3/679

Table 1 Chemical compositions of 300M steel, 2024 and 5A06 Al-alloy and TC12 Ti-alloy (mass fraction / %)

Fig.1 Schematic diagram of shape and size of coated specimen

Fig.2 Schematic diagrams of the coupling mode between titanium alloy plate and mating material

Table 2 Coated specimens and their coupled modes

Fig.3 Temperature control diagram in damp heat test

Fig.4 Schematic diagram of the electrolytic cell for the electrochemical test of coated specimen

Fig.5 Structure diagram of analytic hierarchy process

Table 3 Comparisons of the importance of various key evaluation indicators

Fig.6 Macro morphologies of coated 300M steel (a), coated 2024 Al-alloy (b) and coated 5A06 Al-alloly (c) samples after accelerated testing (From left to right, single sample, directly coupled sample, and insulated coupled sample)

Table 4 Single index ratings of organic coating systems after accelerated testing

Table 5 Comprehensive evaluation values and low-frequency impedance moduli of organic coating systems after accelerated testing

Fig.7 Stress-strain curves of coated specimens of 300M steel (a), 2024 Al alloy (b) and 5A06 Al alloy (c) after accelerated testing

Fig.8 Tensile strengths (a) and elongations (b) of coated specimens with different connecting modes after accelerated testing

Fig.9 Fracture morphologies of coated 300M steel samples after accelerated testing: (a) only coated sample, (b) insulated coupled sample, (c) directly coupled sample

Fig.10 Fracture morphologies of coated 2024 Al alloy samples after accelerated testing: (a) only coated sample, (b) insulated coupled sample, (c) directly coupled sample

Fig.11 Fracture morphologies of 5A06 Al alloy samples after accelerated testing: (a) only coated sample, (b) insulated coupled sample, (c) directly coupled sample

Fig.12 Relationships between tensile strength (a-c) and elongation (d-f) and comprehensive evaluation value for coated 300M steel (a, d), coated 2024 Al-alloy (b, e) and coated 5A06 Al-alloy (c, f)

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