什么是印花彩钢板反冲击试验？

印花彩钢板的反向冲击试验用于评价试样在快速变形时涂层的抗裂性或剥离性。抗冲击性也称为冲击强度。它是指在自由落体重量的冲击下，试样上的涂层会迅速变形并形成凸面区域。检查凸面区域的涂层是否有开裂或脱落，以评价涂层的抗裂性、开裂性和脱落性。它显示了被测涂层的柔韧性和与基材的附着力。

印花彩钢板反向冲击试验所用的仪器是冲击试验机。印刷彩色钢板用普通专用仪器检测。根据国家标准GB/t13448-2006，冲头直径为15.87mm（5/8in），试验结果用“合格/不合格”和“大冲击功”两种方式表示。前者用胶带法检查受锤重和落锤高度冲击的涂层是否剥落，用放 印花彩钢板大镜观察涂层是否开裂；后者是通过改变锤的重量和落下高度的冲击力，找出不开裂、不剥落的涂层的质量和高度，两者的乘积就是大的冲击能量。试验原理是让重锤自由下落冲击试样，使试样变性，逐渐增大重锤落下高度或质量。彩钢板涂层的快速变形抗力是该高度和锤子重量的乘积，用焦耳（J）表示。印刷彩色钢板的抗冲击性能指标一般控制在冲击能不小于9j。

The reverse impact test of printed color steel plate is used to evaluate the anti cracking or peeling ability of the coating when the sample is subjected to rapid deformation. The impact resistance is also called impact strength. It refers to that the coating on the sample will deform rapidly and form a convex area under the impact of the free falling weight. Check whether the coating on the convex area has cracking or falling off, so as to evaluate the coating anti cracking The ability to crack or fall off. It shows the flexibility of the tested coating and the adhesion to the substrate.

The instrument used in reverse impact test is impact tester. Printing color steel plate is tested by common special instruments. According to the national standard GB / t13448-2006, the punch diameter is 15.87mm (5 / 8in), and the test results are expressed in two ways of "qualified / unqualified" and "large impact energy". In the former, the adhesive tape method is used to check whether the coating impacted by the weight and falling height of the hammer is peeled, and whether the coating is cracked is observed with a magnifying glass; the latter is to find out the large mass and height of the coating without cracking or peeling by changing the impact of the weight and falling height of the hammer, and the product of the two is the large impact energy. The principle of the test is to let the heavy hammer fall freely to impact the sample, denaturate the sample, and gradually increase the falling height or mass of the heavy hammer. The rapid deformation resistance of the color steel plate coating is the product of this height and the weight of the hammer, expressed in Joule (J). The impact resistance index of printing color steel plate is generally controlled at the impact energy of no less than 9j.