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首页> 外文会议>Current developments in lens design and optical engineering XI; and advances in thin film coatings VI >Accelerated atmospheric corrosion testing of electroplated gold mirror coatings
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Accelerated atmospheric corrosion testing of electroplated gold mirror coatings

机译：电镀金镜面涂层的加速大气腐蚀测试

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摘要

Gold-coated mirrors are widely used in infrared optics for industrial, space, and military applications. These mirrors are often made of aluminum or beryllium substrates with polished nickel plating. Gold is deposited on the nickel layer by either electroplating or vacuum deposition processes. Atmospheric corrosion of gold-coated electrical connectors and contacts was a well-known problem in the electronic industry and studied extensively. However, there is limited literature data that correlates atmospheric corrosion to the optical properties of gold mirror coatings. In this paper, the atmospheric corrosion of different electroplated gold mirror coatings were investigated with an accelerated mixed flowing gas (MFG) test for up to 50 days. The MFG test utilizes a combination of low-level air pollutants, humidity, and temperatures to achieve a simulated indoor environment. Depending on the gold coating thickness, pore corrosion started to appear on samples after about 10 days of the MFG exposure. The corrosion behavior of the gold mirror coatings demonstrated the porous nature of the electroplated gold coatings as well as the variation of porosity to the coating thickness. The changes of optical properties of the gold mirrors were correlated to the morphology of corrosion features on the mirror surface.
机译：镀金镜面广泛用于工业，太空和军事应用的红外光学系统。这些镜子通常由铝或铍基底制成，并带有抛光的镍镀层。通过电镀或真空沉积工艺将金沉积在镍层上。涂金的电连接器和触点的大气腐蚀是电子工业中的一个众所周知的问题，并进行了广泛的研究。然而，有限的文献数据将大气腐蚀与金镜涂层的光学性质相关。在本文中，使用加速混合流动气体（MFG）试验研究了长达50天的不同电镀金镜面涂层的大气腐蚀。 MFG测试利用低水平的空气污染物，湿度和温度的组合来实现模拟的室内环境。根据金涂层的厚度，MFG暴露约10天后，样品上开始出现孔腐蚀。金镜涂层的腐蚀行为证明了电镀金涂层的多孔性以及孔隙率随涂层厚度的变化。金镜的光学特性的变化与镜表面腐蚀特征的形态有关。

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