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彩涂板断面金相观察

返回列表 来源: 发布日期: 2019.12.19

彩涂板断面金相观察

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两种彩涂板在普通光学显微镜下的400倍金相照片。可见,涂层质量为150g/m2的铝锌合金和涂层质量为275g/m2的纯锌涂层非常薄和厚,彩涂板一侧和两侧的涂层厚度约为20μm,铝的密度小于锌的密度,因此,与纯锌镀层相比,镀层厚度最薄的铝锌合金镀层更薄。从图中可以看出,这两种彩色涂层相对对称,涂层、化学反应和有机化学涂层之间的融合比较平缓,没有非常明显的突起。
用EIS法测量了两个试件的特征阻抗频率bode随侵位时间的变化。结果表明,在鼓泡15天和2天后,az150和z275的特性阻抗开始突然下降。试样的高频特性阻抗Z 0.01hz随浸泡时间的变化而变化。高频特性阻抗是测量光催化特性阻抗最可靠的参数。它能定性分析试样的耐蚀性。高频特性阻抗越高,原材料的耐蚀性越好。可见,两种样品的特性阻抗随气泡侵入的实际时间而变化。在开始阶段(即气泡侵入0.5h),两个样品的电阻几乎没有下降,直到气泡侵入15天后,电阻开始从气泡侵入下降到2.984×107Ω·cm 2,因为铝是一种非常钝的金属。

400 times metallographic photos of two kinds of color coated plates under ordinary optical microscope. It can be seen that the aluminum zinc alloy with the coating mass of 150g / m2 and the pure zinc coating with the coating mass of 275g / m2 are very thin and thick, the coating thickness of one side and two sides of the color coated plate is about 20 μ m, and the density of aluminum is less than the density of zinc, so the aluminum zinc alloy with the lightest coating thickness can be very thin compared with the pure zinc coating. It can be seen from the figure that the two kinds of color coating are relatively symmetrical, and the fusion between coating, chemical reaction and organic chemical coating is relatively gentle, without very obvious protuberance.

The EIS method was used to measure the variation of the characteristic impedance frequency bode of the two specimens with the emplacement time. The results showed that the characteristic impedance of az150 and z275 began to drop suddenly after 15 and 2 days of bubbling. The high frequency characteristic impedance Z 0.01 Hz of the sample changes with the immersion time. The high frequency characteristic impedance is the most reliable parameter to measure the characteristic impedance of photocatalysis. It can qualitatively analyze the corrosion resistance of the sample. The higher the high frequency characteristic impedance, the better the corrosion resistance of the raw materials. It can be seen that the characteristic impedance of the two samples changes with the actual time of bubble invasion. At the beginning (i.e. bubble intrusion for 0.5h), the resistance of the two samples almost did not drop until 15 days after bubble intrusion, the resistance began to drop from bubble intrusion to 2.984 × 107 Ω· cm 2, because aluminum is a very blunt metal.
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