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彩钢板的耐湿热试验

返回列表 来源: 发布日期: 2019.09.08

钢板的耐湿热试验

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彩钢板的耐湿热试验又称潮湿试验,用于评价彩钢板涂层对高温高湿作用的抵抗能力。 彩钢板的耐湿热性试验也属检测涂层耐蚀性的一种方法,因此通常与盐雾试验同时进行。由于彩钢板的耐湿热性试验中最主要的影响因素是温度和湿度,所以在每次试验的全过程中要特别注意对调温调湿箱这两项指标的调控,以免影响试验结果。

彩钢板的耐湿热性试验通常用两种方法进行一是冷凝湿热法:将试样放置在温度为(38±2)℃,相对湿度不小于98%的封闭试验箱中(见图4-18),利用试验样板和周围蒸汽之间非常细微的温差使样板上形成冷凝水,评定试样涂层的抗水渗透能力。二是非冷凝湿热法:将试样放置在温度为(40±2)℃,相对湿度不小于95%的通风试验箱中,评定试样涂层的耐湿热性能。

对于试样的评定,主要是按CB/T1766-1995标准观察涂层有无起泡、开裂、生锈和脱落的等级,取其平行试样的最差值为试验结果。

Humidity and heat resistance test, also known as humidity test, is used to evaluate the resistance of coatings to high temperature and humidity. Humidity and heat resistance test is also a method to test the corrosion resistance of coatings, so it is usually carried out at the same time as salt spray test. Because temperature and humidity are the main influencing factors in the humidity and heat resistance test, special attention should be paid to the regulation and control of temperature and humidity regulating box in the whole process of each test so as to avoid affecting the test results.

The wet-heat resistance test is usually carried out by two methods: condensation wet-heat method: placing the sample in a closed test box with temperature of (38 (+2)degrees C and relative humidity of not less than 98% (see Fig. 4-18), using the very fine temperature difference between the test sample and the surrounding steam to form condensate water on the sample plate, and evaluating the water permeability resistance of the sample coating. The second is non-condensation wet-thermal method: the samples are placed in a ventilation test box with temperature of (40 (+2)degrees C and relative humidity of not less than 95% to evaluate the wet-heat resistance of the sample coating.

For the evaluation of the samples, the grade of foaming, cracking, rusting and shedding of the coatings were observed according to CB/T1766-1995 standard, and the maximum difference of the parallel samples was taken as the test results.

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