软熔参数和基板对镀锡板锡铁合金层性能的影响

Effects of reflowing parameters and steel substrate on properties tin–iron alloy layer on surface of tinplate

通过计时电位、电化学阻抗谱(EIS)与塔菲尔(Tafel)曲线测试,以及X射线衍射(XRD)与扫描电镜(SEM)分析,研究了软熔参数和基板对镀锡板表面锡铁合金层的质量、耐蚀性、形貌和微观结构的影响。结果表明,随软熔温度升高或软熔时间延长,锡铁合金层的晶粒尺寸增大,耐蚀性提高。当钢基板的(200)晶面取向度较高或(110)晶面取向度较低时,锡铁合金的晶面取向较均匀,晶粒尺寸较大,耐蚀性也较好。

The effects of reflowing parameters and steel substrate on the mass, corrosion resistance, morphology, and microstructure of tin–iron alloy layer formed on tinplate surface were studied by electrochemical impedance spectroscopy(EIS), Tafel curve measurement, chronopotentiometry, X-ray diffractometry(XRD), and scanning electron microscopy(SEM). The results showed that the increase of reflowing temperature or extension of reflowing time resulted in the increase of grain size and improvement of corrosion resistance for tin–iron alloy layer. The tin–iron alloy layer formed on the steel substrate with high texture coefficient of(200) plane or low texture coefficient of(110) plane has uniform crystal plane orientation, large grain size, and good corrosion resistance.