无取向硅钢环保绝缘涂层的制备与性能

Preparation and Performance of Insulating Coating on Non-oriented Silicon Steel

目的：寻求替代含铬绝缘涂料的环保绝缘涂料。方法采用水溶性磷酸盐和水性树脂自制水性涂料,在无取向硅钢表面制备绝缘涂层,研究其固化工艺,并与国内涂料进行理化指标和涂层性能（附着力、表面电阻、耐腐蚀性能、耐热性）对比。结果自制绝缘涂料无刺激性气味,稳定性好,使用寿命长,在固化时间20-24 s、固化温度480-520°的条件下,可在无取向硅钢表面制得均匀、光亮的银灰色绝缘涂层。绝缘涂层附着力为A级,12 h中性盐雾试验腐蚀面积低于5%,在750°高温退火2 h不掉粉,表面绝缘电阻为297Ω/mm2（1.0-1.2μm）。结论自制水性绝缘涂料为环保型单组分涂料,与国内绝缘涂料的涂层性能相当,满足国内钢厂产品技术要求。

Objective To seek environment-friendly insulating paint for replacing chromate coating. Methods A new chromate-free insulating coating on non-oriented silicon steel was prepared using self-made water-based paint composed of inorganic salt and water-soluble resin. The curing process of the insulating paint was studied, and the performance （ adhesion, high temperature an-nealing, corrosion resistance and surface insulating resistance） of the insulating coating was analyzed in comparison with domestic coatings. Results The self-made paint had low offensive odor, good stability and long life; the insulating coating was light silver gray when the curing parameters were 20-24 s and 480-520 °;the adhesion force of the insulating coating was A;the corrosion area was less than 5% after 12 h salt spray;there was no coating desquamate after high-temperature annealing at 750 ° for 2 h;and the surface resistance was 297 Ω/mm2（1. 0-1. 2 μm）. Conclusion The self-made water-based paint was a one-component chromate-free paint, the performance of the insulating coating met the technical requirement of steel products, as good as that of do-mestic paints.