铝合金表面聚氨酯涂层在加速实验条件下的老化机制及规律研究

doi:10.11902/1005.4537.2016.057

中国腐蚀与防护学报

2018, Vol. 38

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

本期目录 | 过刊浏览

铝合金表面聚氨酯涂层在加速实验条件下的老化机制及规律研究

崔晓飞¹, 谭晓明²(

), 王德², 钱昂²

1 海军装备部航空装备局北京 100841
2 海军航空大学青岛校区青岛 266041

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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摘要:

针对有机涂层抗腐蚀性能评估问题,基于涂层老化物理机制,运用热力学理论建立了紫外线辐照条件下当量折算系数理论模型,提出了有机涂层加速老化实验谱编制方法。针对铝合金表面聚氨酯涂层进行了加速老化实验,分别从宏观和微观形貌、失光率、色差、粘附性能、电化学阻抗等多个方面表征了涂层老化规律,揭示了老化物理机制。结果表明,失光率和色差不能作为涂层失效评估参数,粘附性能和电化学阻抗能较好地表征涂层老化规律。涂层老化过程大致可以分成3个阶段,初期 (第0~2个周期) 抗腐蚀性能完好,低频电化学阻抗|Z |_{0.01 Hz}为10¹⁰ Ωcm²量级;中期 (第3~7个周期),|Z |_{0.01 Hz}为10⁷~10⁹ Ωcm²量级,内部微孔增大增多,抗腐蚀性能明显衰减;后期 (第8~9个周期),表面出现局部鼓包,|Z |_{0.01 Hz}为10⁶ Ωcm²量级,粘附性能仅为初始值的35%,涂层失效。涂层的使用寿命大约为8 a,这与实际使用情况相吻合,初步验证了涂层加速实验谱编制方法的合理性和可行性。

关键词 ：铝合金, 聚氨酯涂层, 加速实验谱, 紫外线辐照, 电化学阻抗, 粘附性能

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

收稿日期: 2016-04-26

ZTFLH:

TG171

基金资助:“泰山学者”建设工程专项经费

作者简介: 作者简介崔晓飞,男,1975年生

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引用本文:

崔晓飞, 谭晓明, 王德, 钱昂. 铝合金表面聚氨酯涂层在加速实验条件下的老化机制及规律研究[J]. 中国腐蚀与防护学报, 2018, 38(1): 74-80.
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.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.057 或 https://www.jcscp.org/CN/Y2018/V38/I1/74

图1 聚氨酯涂层加速实验流程

表1 不同温度与紫外线辐照强度的折算系数

图2 不同老化周期涂层表面老化形貌

图3 涂层经不同周期老化实验后表面的微观形貌

图4 色差和失光率的变化

图5 涂层附着力的变化

图6 涂层试样经不同周期老化后的阻抗复平面图

图7 经不同周期老化实验后涂层试样的Bode图

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