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对SiO_2/CrO_x/CrN_y/Al型太阳能光谱选择性吸收涂层的盐雾腐蚀性能进行测试。在35℃下经质量分数为1%、3%、5%的NaCl盐雾处理一系列时间后采用UV、VIS、NIR、FTIR、SEM等方法表征该涂层腐蚀后光学性能及表面形貌的变化。结果表明经不同浓度的NaCl盐雾腐蚀后涂层出现表面粗糙度增加、白色斑点、起泡等缺陷。光学性能的衰减规律为:吸收比呈指数衰减,发射比初期迅速增加,然后进入钝化期,最后进入过钝化期而再次迅速增加。
The salt spray corrosion performance of the SiO2 / CrOx / CrNy / Al solar selective absorption coating was tested. After being treated with NaCl salt spray for 1%, 3%, 5% NaCl at 35 ℃ for a series of time, UV, VIS, NIR, FTIR, SEM and other methods were used to characterize the optical properties and surface topography Variety. The results show that after different concentrations of NaCl salt spray corrosion coating surface roughness increased, white spots, blisters and other defects. Optical properties of the attenuation of the law: the absorption ratio decreased exponentially, the launch increased rapidly than the initial, and then into the passivation period, and finally into the passivation period and then rapidly increased.