一、绪言有机膦酸HEDP〔CH_4OC(PO_3H_2)_2〕具有较强的络合能力,较好的稳定性和一定的表面活性,可适于镀Cu、Zn、Cd、Au、Sn、Pb-Sn、低锡青铜等镀种。我厂通过HEDP镀铜,HEDP镀铜锡合金一年多生产实践证明,HEDP的络合能力较强,但HEDP对钢铁表面活化作用比氰化物体系较差。在HEDP镀铜和HEDP镀铜锡合金电解液中,发现随着HEDP含量的增高,它对钢 I. INTRODUCTION The organic phosphonic acid HEDP [CH_4OC (PO_3H_2) _2] has strong complexation ability, good stability and certain surface activity and can be suitable for Cu, Zn, Cd, Au, Sn, Pb-Sn , Low tin bronze plated. Our factory through HEDP copper, HEDP copper-tin alloy production more than a year of practice proved that HEDP stronger complexation ability, but HEDP steel surface activation than the cyanide system is poor. In HEDP copper plating and HEDP copper-tin alloy electrolyte, it was found that with the HEDP content increased, it is steel