Assessment of Aging Performance of Polyurethane Coating for 7B04 Al-alloy with an Accelerated Testing Spectrum

doi:10.11902/1005.4537.2016.057

Journal of Chinese Society for Corrosion and protection

2018, Vol. 38

Issue (1): 74-80 DOI: 10.11902/1005.4537.2016.057

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Assessment of Aging Performance of Polyurethane Coating for 7B04 Al-alloy with an Accelerated Testing Spectrum

Xiaofei CUI¹, Xiaoming TAN²(

), De WANG², Ang QIAN²

1 Aeronautical Equipment Department of the Naval Equipment Department,Beijing 100841, China
2 Qingdao Branch, Naval Aeronautical University, Qingdao 266041, China

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Abstract

A model of equivalent conversion coefficient for UV radiation was firstly proposed, and which then was coupled with the existed acceleration corrosion testing method to establish a test spectrum for the assessment of aging performance of polyurethane coating on 7B04 Al-alloy plate. The aging behavior of polyurethane coating were characterized by means of macroscopic- and microscopic-observation, gloss loss-, color change- and adhesion strength-measurement, and electrochemical impedance spectroscopy (EIS) etc. Results show that the gloss loss and color change are not the suitable index for representing coating degradation degree, but the adhesive force and EIS are the appropriate ones to characterize the aging behavior of coating. The aging process of coating can be broadly divided into three stages: in the initial stage, the coating was intact with impedance above 10¹⁰ Ωcm²; in the middle stage, the anticorrosion performance of the coating was impaired to a certain extent with impedance within a range of 10⁷~10⁹ Ωcm², while pores increase in the coating; and in the late stage, coating was failed with blisters on its surface, while, of which the impedance lowered to 10⁶ Ωcm² and the adhesive was reduced to 35% of the original value. It was found that the coating service life was ca 8 a, which is in line with the behavior conditions of the coating at the local airport. On this account, the rationality and feasibility coating accelerated aging test spectrum were verified.

Key words: Al-alloy polyurethane coating accelerated testing spectrum ultraviolet radiation EIS adhesion strength

Received: 26 April 2016

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Cite this article:

Xiaofei CUI, Xiaoming TAN, De WANG, Ang QIAN. Assessment of Aging Performance of Polyurethane Coating for 7B04 Al-alloy with an Accelerated Testing Spectrum. Journal of Chinese Society for Corrosion and protection, 2018, 38(1): 74-80.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.057 OR https://www.jcscp.org/EN/Y2018/V38/I1/74

Fig.1 Accelerated testing flow chart of polyurethanecoating

Table 1 Acceleration factors under the different conditions of temperature and UV radiation

Fig.2 Surface morphologies of the coating after aging for 0 cycle (a), 3 cycles (b), 5 cycles (c), 8 cycles (d) and 9 cycles (e)

Fig.3 SEM surface images of the coating after aging for 0 cycle (a), 3 cycles (b), 6 cycles (c) and 9 cycles (d)

Fig.4 Variations of color change and gloss loss of the coating with accelerated test time

Fig.5 Change of the adhesion of the coating with time

Fig.6 Nyquist plots of the coated specimen after aging for 0~2 cycles (initial stage) (a), 3~6 cycles (medium stage) (b), 7 cycles (medium stage) (c), 8~9 cycles (later stage) (d)

Fig.7 Bode plots of the coated specimen after aging for 0 cycle (a), 5 cycles (b), 7 cycles (c) and 9 cycles (d)

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