基板对TFS产品表面形貌及其耐蚀性的影响

采用金相显微镜和电子扫描显微镜(SEM)研究了CA材、BA材和DR材的原板金相结构对镀铬铁产品表面形貌的影响,通过铁溶出值和电化学极化曲线评价了不同镀铬铁产品的耐蚀性.结果表明,与CA向镀铬铁产品相比,BA材表面铬镀层晶粒较为粗大,且致密、孔隙率低,而DR材镀铬铁产品表面存在明显的微裂纹;相同生产工艺条件下,T2.5-BA镀铬铁产品耐蚀性能要好于CA材和DR材;对于CA向TFS产品,调制度越高,其耐蚀性越差.

Effect of Different TFS Black Sheets on Surface Morphology and Corrosion Resistance of TFS Products

Effect of the metallographic structures of CA, BA and DR black sheets on the surface morphology of TFS products was investigated via metalloscope and SEM. In addition, the corrosion resistance of TFS products was evaluated by the iron solubility values and electrochemical polarization curves. The results showed that in the compact surface Cr-coating of BA black sheet with low porosity the grains are larger and coarser in comparison with that of CA sheet, while the evident microcracks are found in the surface Cr-coating of DR sheet. And the corrosion resistance of T2.5-BA Cr-coating sheet is higher than that of CA and DR sheets under the same schedules. As to the TFS products with CA black sheets, the more frequent the modulations, the lower the corrosion resistance.