Research on Electrochemical Micromachining of Micro-dimple Array with a PDMS Mask on Chromium Plating Surface
Microelectrochemical machining using polydimethylsiloxane(PDMS)as a mask can efficiently achieves a group of micro-dimple array,thereby improving surface tribological properties and prolonging the lifespan of components.However,the size uniformity of the obtained micro-dimple arrays is poor due to the edge effect of the electric field.To address this issue,a thick PDMS film plate and high pressure hydrostatic was used for mask electrochemical machining to explore the influence of process parameters on the size and machining accuracy of micro-dimple array on the surface of the chromium coating layer.Then processing was carried out on the wear-resistant chromium plating layer surface to verify the friction performance of the chromium coating layer surface,and the influence of micro-dimple array size on the friction performance of the chromium plating layer surface was analyzed.The result showed micro-dimple arrays with average diameter and depth of 106.23 μm and 15.33 μm can be processed under a duty cycle of 100%,a voltage of 30 V and a processing time of 30 s.On this basis,the anti-wear effect of machining was explored,and it was found that micro-dimple arrays with different diameters achieved the best anti-wear effect at a depth of 5 μm.
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