一步法替代热扩散电镀工艺对钢帘线性能影响

Effect of one-step electroplating instead of thermal diffusion electroplating on properties of steel tyre cord

钢帘线生产中以一步法电镀工艺代替热扩散电镀,可节约中频热扩散损耗且无需磷化处理,进而减少工艺流程及生产成本。本文对两种工艺3+9结构帘线生产过程的相关性能进行对比分析。研究发现:一步法生产的钢丝镀层更为致密,镀层仅存在α相黄铜,与热扩散电镀的钢丝相比具有更好的延展性,进而使得拉拔过程中的镀层损耗更少,合股过程的断丝率更低,且其镀层内外组分基本均匀一致。一步法钢丝与热扩散钢丝相比具有更低的表面ZnO含量,其初始黏合力高于热扩散帘线约26.15%,3 d、7 d、14 d的93℃/95%RH的湿热老化黏合分别高于热扩散帘线11.49%、17.11%和4.35%,两种工艺帘线初始黏合或老化黏合覆胶率基本一致。

In the production of steel tyre cord,one-step plating process is used instead of thermal diffusion plating,which avoids intermediate frequency thermal diffusion consumption and phosphating,and then reduces the technological process and production cost.The related properties of 3+9 steel tyre cord produced by the two processes are compared.It is found that steel wire coating of the one-step progress is denser,and made ofα-phase brass only.One-step steel wire coating has better ductility,less coating shedding during drawing,and lower breaking frequency in twisting than thermal diffusion wire.The composition of one-step steel wire coating is uniform.The surface ZnO content of one-step steel wire is lower than that of thermal diffusion steel wire,and the initial adhesion is about 26.15%higher.The aging adhesion force of one-step cord at 93℃/95%RH constant temperature aging for 3 d,7 d and 14 d are 11.49%,17.11%and 4.35%higher than that of thermal diffusion cord and humidity,respectively.Rubber coverage of two processes cord are basically the same whether it is initial bonding or aging bonding.