Improving the Corrosion Resistance of Hard Chromiumby Using Periodic Cathodic Current

摘要

Hard chromium plating using hexavalent chromium solution is extensively used for surfacerntreatment to improve hardness, friction performance and wear resistance.rnThe corrosion resistance of chromium deposit is not as efficient as end-users want it: manyrnresearch works have been performed to increase the corrosion resistance of chromium electro-deposit.rnWe have study the influence of the current density, the temperature and the bath composition onrnthe structure of the chromium deposit. Through this study it appears that it is possible in somerncases to increase drastically the corrosion resistance using multi-layers deposits of differentrnstructure without modifying the mechanical properties (in particular micro-hardness)