Iron Base/Ni-Cr Alloy Preparation Process

Nickel-chromium alloys electrodeposition on iron have been studied. Preparation of Ni-Cr alloy mainly by electrochemical deposition method to achieve. Because of the different potentials of nickel and chromium, to make co-deposition, we choose suitable chelating agent, adjust the nickel, chrome electrode potential to close. Process parameters such as temperature, pH, cathode current density on the the plating chromium content greater impact. The test results show that:The chromium content in the coating decreases as the temperature rises, and appropriate to raise the pH and the cathode current density can be improved in the chromium content in the plating.Pre-plated play a very large role in the plating process, substrate with the plating solution of two-phase interface occur electrochemical reaction, the coating is good or bad depends on the reaction can proceed smoothly closely related, two-phase interface is poor contact, the electrochemical reaction can not be carried out smoothly, the coating quality is very poor.Through XRD, EDS and SEM test method analysis of the coating. The results showed that coating is nickel-chromium alloy eutectic,the organizational structure of the alloy is dense, grain size uniformity, the formation of hydrogen low degree of pinhole, and good abrasion resistance.