硫酸亚铁浓度对微弧氧化膜光学性能的影响

Effect of FeSO4 concentration on the optical property of ceramic coatings by micro-arc oxidation

摘要:

为了解决传统阳极氧化技术在铝合金表面制备黑色膜层存在耐光老化性能较差、容易脱落、紫外线照射下容易变色或脱色等问题,采用微弧氧化方法在LD10铝合金表面原位生长黑色陶瓷膜．通过SEM、XRD、EDS和紫外可见分光光度计等手段,分析了FeSO₄浓度对陶瓷膜表面形貌、相组成、元素组成和太阳吸收率的影响规律．结果表明:陶瓷膜由α-Al₂O₃和γ-Al₂O₃相组成,随着FeSO₄浓度的增加,陶瓷膜的太阳吸收率呈现先增大后减小的趋势．当溶液中FeSO₄质量浓度为5 g/L时,陶瓷膜层的太阳吸收率达到最大值0.91．

Abstract:

To solve the problems, such as poor ultraviolet resistance, easy to fall off, easy to change color or bleaching under UV irradiation and so on, of black coatings on aluminum surface by traditional anodic oxidation, the black oxidation ceramic coatings on the surface of LD10 aluminum alloy by micro-arc oxidation were obtained. Its morphology, phase composition, elemental component and solar absorptance were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive spectroscopy (EDS) and UV/VIS spectrophotometer. The results showed that micro-arc oxidation ceramic coatings were composed of α-Al₂O₃ and γ-Al₂O₃. The solar absorptance of ceramic coatings was increased at first then decreased with the increasing of FeSO₄ concentration. When the concentration of FeSO₄ was 5 g/L, the solar absorptance value of the ceramic coating could reach up to 0.91.