冷轧无取向电工钢环保绝缘涂层性能评价试验研究

Experimental Study on Performance Evaluation of Environment-friendly Insulation Coatings of Cold Rolled Non-oriented Electrical Steel Sheet

基于用户加工工艺,通过实验室对比试验,并结合产品实际使用情况,研究了冷轧无取向电工钢环保绝缘涂层的耐蚀性、耐高温性及涂层附着性的评价试验方法及指标。结果表明:1涂层耐蚀性的评价试验方法宜采用"NSST/6h,锈蚀面积小于5%;NSST/12h,锈蚀面积小于20%";2涂层耐高温性适宜的评价试验方法为"将试样叠置于氮气保护气氛下经750℃加热保温2h,涂层无起泡、脱落、掉粉";3对于涂层附着性,较为适宜的评价试验方法为"试样依次经0T弯曲变形、采用3M胶带粘贴弯曲变形部位并撕离和浸入5%CuSO4溶液浸泡5s,涂层均无开裂、剥落或变色"。

According to the user＇ s process and the actual usage of the products, a series of parallel experiments have been done to explore the suitable test method and evaluation index of corrosion resistance, high temperature resistance and adhesion of environment-friendly insulation coatings on cold rolled non-oriented electrical steel sheet. The results show that the advisable evaluation method is that the corrosion area is less than 5% and 20% after six hours and twelve hours neutral salt spray test respectively. The appropriate test method of high temperature resistance of the coatings is that the laminated samples are placed in the nitrogen gas protective furnace and then heated up to 750 ℃and held for 2 hours,the coating is qualified to be of good high temperature resistance if it has no blister, crack, flake and powder. The proper evaluation method of coating adhesion is that the sample is bend deformed with 0T,the 3M adhesive tape is stuck on the deformation area,tore off and then immersed in the 5% CuSO4 for 5 seconds,the coating adhesion is qualified to be okay if it has no obvious crack, flake or discolor.