无铬无取向硅钢涂层烧结固化工艺

Curing process of chromium-free non-oriented silicon steel coatings

为进行磷酸盐系无铬无取向硅钢涂层烧结固化工艺研究,首先对磷酸盐系无铬无取向硅钢涂层进行热重-差示扫描量热(TG-DSC)分析;然后在不同烧结固化温度条件下,测定涂层板温随时间变化曲线;最终获得涂层烧结固化温度与时间(T-t)工艺曲线。通过中性盐雾试验、动电位极化、交流阻抗、涂层附着力以及扫描电子显微镜(SEM)和能谱(EDS)分析验证。结果表明,根据涂层烧结固化温度与时间(T-t)工艺曲线制备的涂层结构致密、性能优异,证明该工艺曲线具有合理性与正确性。

In order to study the curing process of chromium-free non-oriented silicon steel coatings, phosphatic chromium-free non-oriented silicon steel insulating coating was prepared and TG-DSC analysis of the coating was conducted, then the change of the actual temperature of the coated non-oriented silicon steel sheet with time at different curing temperatures was studied. Based on the experiments, the processing curves of curing temperature vs. curing time （T-t） for the chromium-free non-oriented silicon steel coatings were obtained. Salt spray experiment, potentiodynamic polarization, electrochemical impedance spectroscopy, adhesion testing and SEM, EDS were used to examine properties of the coatings. The results show that the coatings withe dense structure and excellent performance can be obtained based on the processing curves of curing temperature vs. curing time （ T-t）.