摘要
采用包覆有50％（质量分数）Ni的Cr3C2微米颗粒（粒径3～5μm）为第二相，以脉冲喷射电沉积制备Co—Cr3C2复合镀层。镀液组成和工艺参数为：CoSO4·7H20 430g／L，Cr3C2 200g／L，H3BO3 30g／L，NaCl 5g／L，十六烷基三甲基溴化铵适量，pH=4，温度40℃，电压18V，镀液流量2．4L／min，喷头移动速率1．2mm／s。研究了脉冲参数对复合镀层颗粒复合量、表面粗糙度、显微硬度以及耐磨性的影响，并探讨了颗粒复合量对镀层性能的影响。Cr3C2颗粒的复合量越高，复合镀层的显微硬度就越高，耐磨性也越好，但表面粗糙度增大。最优脉冲参数为：占空比30％，脉冲周期200ms。所得Co—Cr3C2复合镀层的颗粒含量达11．98％，显微硬度为542．6HV，摩擦因数为0．443。Cr3C2颗粒在镀层中分布均匀，与基质金属结合牢固。
A Co-Cr3C2 composite coating was prepared by pulse jet electrodeposition using Cr3C2 micron particles coated with 50wt% Ni in a diameter of 3-5 μm as the second phase. The bath composition and process parameters are： COSO4·7H2O 430 g/L, Cr3C2 200 g/L, H3BO3 30 g/L, NaCl 5 g/L, cetyltrimethylammonium bromide as required, pH 4, temperature 40 ℃, potential 18 V, flow rate of bath 2.4 L/min, and moving rate of sprinkler 1.2 mm/s. The effects of pulse parameters on the particle content, surface roughness, microhardness and wear resistance of composite coating were studied, and the influence of particle content of coating on its performance was discussed. With increasing Cr3C2 particle content of composite coating, its microhardness is increased and its wear resistance becomes better, however, its surface roughness is increased. The optimal pulse parameters are duty cycle 30% and pulse cycle 200 ms. The obtained Co-Cr3C2 composite coating has a particle content of 11.98wt% with a microhardness of 542.6 HV and a friction coefficient of 0.443. The Cr3C2 particles are uniformly distributed in the coating and bonded tightly to the metal matrix.
出处
《电镀与涂饰》
CAS
CSCD
北大核心
2016年第13期665-671,共7页
Electroplating & Finishing
关键词
钴
碳化铬
微米颗粒
复合镀层
脉冲喷射电沉积
耐磨性
显微硬度
表面粗糙度
cobalt
chromium carbide
micron particle
composite coating
pulse jet electrodeposition
wear resistance
microhardness
surface roughness
