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彩涂卷的耐二氧化硫湿热试验

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放大字体  缩小字体    发布日期:2019-09-12  来源:唐山天物彩板有限公司  作者:天物彩板  浏览次数:4
核心提示:彩涂卷的耐二氧化硫湿热试验是将试样暴露在含有SO2的湿热气氯中,在规定的试验周期后,测量其色差、光泽,评定其变色、失光、表面或边部腐蚀状况。耐二氧化硫湿热试验适用于彩涂板在二氧化硫(SO2)湿热气氛中耐腐蚀性能的评定。
 彩涂卷的耐二氧化硫湿热试验是将试样暴露在含有SO2的湿热气氯中,在规定的试验周期后,测量其色差、光泽,评定其变色、失光、表面或边部腐蚀状况。耐二氧化硫湿热试验适用于彩涂板在二氧化硫(SO2)湿热气氛中耐腐蚀性能的评定。
 
  试验前应先测定试样的光泽和色度坐标值,然后将试样放入通有二氧化硫(SO2)气体的试验箱内,开启加热器,将试验箱温度在约1.5h内升至(40±3)℃,当试样在箱内放置了8h之后,箱体排水、排气并通入压缩空气作为一个试验循环的始末,重复以上操作将试验连续至规定的循环周期或规定的损坏程度。
 
  试样取出后应再测定其光泽和色度坐标值和计算色差,按GB/T1766-1995标准平定试样的失光等级、变色等级、起泡等级、生锈等级等,取平行试样的最差值为试验结果。
Sulfur dioxide hydrothermal test is to expose the sample to the humid and hot gas chlorine containing SO2. After the prescribed test period, the color difference and gloss of the sample are measured, and the state of discoloration, loss of gloss, surface or edge corrosion is evaluated. The wet-heat test of sulfur dioxide resistance is suitable for evaluating the corrosion resistance of color coated panels in hot and humid atmosphere of sulfur dioxide (SO2).
 
Before the test, the gloss and chroma coordinates of the sample should be measured, and then the sample should be placed in the test box with SO2 gas, the heater should be opened, and the temperature of the test box should be raised to (40 + 3)C within about 1.5 hours. After the sample is placed in the box for 8 hours, the drainage and exhaust of the box body are combined with compressed air as a test cycle. Repeat the above operation from beginning to end to continue the test to the prescribed cycle or the prescribed degree of damage.
 
The gloss and chromaticity coordinate values and calculated chromatic aberration should be determined after the sample is taken out. The gloss loss grade, discoloration grade, foaming grade and rusting grade of the sample should be adjusted according to GB/T 1766-1995 standard, and the maximum difference of the parallel sample should be taken as the test result.
 
 
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