电镀金刚石耐磨滑履

Electroplated diamond wear-resistance skid-plate

提高清扫车滑履的耐磨性，是延长滑履使用寿命的关键因素。本文采用复合电镀工艺，用金刚石做磨料，镍锰合金作胎体材料，研制和生产耐磨金刚石滑履，金刚石的品级为MBD4，粒度是0.315-0.25mm、0.25-0.212mm、0.212-0.16mm，各种粒度的比例（质量比）分别是30%、30%和40%。电镀金刚石滑履在室温下进行，pH在3.5-5之间，电流密度0.8-1.2A/dm^2。比较系统地研究了镀液中Mn^2＋/（Ni^2＋ ＋ Mn^2＋）比值对镍锰合金胎体成分的影响以及镍锰合金比例对胎体的表面洛氏硬度和耐磨性的影响。结果表明：镀液中Mn^2＋/（Ni^2＋ ＋ Mn^2＋）摩尔比值最佳为0.063，镀层中锰的含量为0.1%，此时镀层的表面洛氏硬度是45±2HRC，用这种胎体配方研制的金刚石滑履的使用寿命将超过4年。

In order to prolong the lifespan of skid-plate of cleaning vehicle, it is the most important to increase its wear- resistance. In this paper,the diamond skid-plate was developed and manufactured by adopting composite electroplating method. Diamond was used as abrasive and Ni-Mn alloy as matrix material. The skid-plate was available in MBD4 diamond. It contained 30% by weight 0.315-0.25 mm diamond,30% by weight 0.25 - 0. 212 mm diamond and 40% by weight 0. 212 - 0.16 mm diamond. The diamond skid-plate was electroplated at ambient temperature, current density 0.8 - 1.2 A/dm^2 and pH value 3.5 - 5. The effect of Mn^2＋/（ Ni^2＋ ＋ Mn^2＋ ） in bath on the Mn content in alloy was studied systemically. The influence of Mn content in alloy on the Rockwell superficial hardness and wear resistance of matrix was also investigated. The results showed Mn^2＋ / （ Ni^2＋ ＋ Mn^2＋ ） in bath significantly affected the Mn content in matrix and the Rockwell superficial hardness and wear resistance of matrix, the optimum condition was： Mn^2＋/（ Ni^2＋ ＋ Mn^2＋ ） in bath 0.063 ,Mn content in matrix 0.1% ,the Rockwell superficial hardness of matrix 45 ± 2HRC . Average life of the diamond wear-resistance skid-plate is about four years. Ni-Mn alloy was an ideal material for matrix.