彩涂钢板的划格试验

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彩钢板的划格试验，主要用于评价试样的初涂层与基板的附着力或多层涂层系统中涂层彼此抗分离的能力。

附着力是评价彩钢板涂层质量最基本指标之ー。目前国内彩钢板彩涂行业多采用划格法，划格试验通常采用划格试验仪(图4-16)按国家标准进行，采取十字切割涂层时有如下试验技术要求:刀刃间距分别为:涂层厚度为0-50um的试样，选用11个刃口的划格仪，刀刃间距为1mm，以平稳的手法划出平行的11条切割线;而对于涂层厚度为50～125um的试样，选用6个刃口的划格仪，刀刀间距均为2mm，以平稳的手法划出平行的6条切割线。再与原先的切割线成90°角垂直交又划出平行的11条或6条切割线，形成格子图形，最后用600号的黏胶带黏附于涂层上，然后用与试样表面成60°角方向的力迅速拉下胶带，检验 彩钢板涂层是否剥离基板。

彩钢板涂层附着力主要由涂料配方性质决定，但基板表面的洁净程度也能严重影响涂层附着力，特别是当基板表面有油污、石蜡、硅油等脱模剂、有机硅类助剂时，表面极性很弱，且阻碍涂料与基板表面的直接接触，附着力将严重下降。因此，严格控制基板的脱脂清洗等表面处理，可大大改善附着力。増强表面极性才可以保证涂料的附着力。

我国彩涂业的划格试验的结果评定，多以涂层被切割并用胶粘带撕离后的表面损坏状态与国家标准CB/T13448-2006中的“试验结果分级”形式进行对比，将试验面按01、2、3、4、5六个等级作分级表示的。

划格试验器，国内已有多种规格(6刃、11刃)产品应市，用户可根据各自试验需要和技术标准要求合理选择、配套使用。

The scratch test of color coated steel plate is mainly used to evaluate the adhesion between the initial coating of the sample and the substrate or the anti-separation ability of the coatings in the multi-layer coating system.

Adhesion is the basic index for evaluating coating quality. At present, the gridding method is widely used in the domestic color coating industry. The gridding test is usually carried out by the gridding tester (Figure 4-16) according to the national standard. When the cross-cutting coating is adopted, the following test technical requirements are required: the blade spacing is 0-50um for the sample with coating thickness, 11 edge grinding instruments are selected, and the blade spacing is 1mm, which is a smooth method. Eleven parallel cutting lines are drawn, and for the samples with coating thickness of 50-125 um, six edge grinding instruments are selected, with tool spacing of 2 mm, and six parallel cutting lines are drawn by a smooth method. Then, 11 or 6 parallel cutting lines are drawn vertically intersecting with the original cutting line at 90 angle to form a lattice pattern. Finally, 600 adhesive tape is used to adhere to the coating. Then, the tape is pulled down rapidly with the force at 60 angle to test whether the coating peels off the substrate.

The adhesion of coatings is mainly determined by the formulation properties of coatings, but the cleanliness of the substrate surface can also seriously affect the adhesion of coatings, especially when there are oil stains, paraffin, silicone oil and other release agents, organosilicon additives on the substrate surface, the surface polarity is very weak, and the direct contact between coatings and the substrate surface is hindered, and the adhesion will be seriously reduced. Drop. Therefore, strict control of degreasing and cleaning of the substrate surface treatment can greatly improve the adhesion. Strengthen the surface polarity to ensure the adhesion of the paint.

The results of the grading test in China's color coatings industry are mostly evaluated by comparing the surface damage state of the coatings after being cut and torn off by adhesive tape with the "grading of test results" in the national standard CB/T13448-2006. The grading of test surfaces is expressed by six grades: 01, 2, 3, 4 and 5.

There are many kinds of specifications (6-edge and 11-edge) in China. Users can choose and use them reasonably according to their test needs and technical standards.