In order to obtain a smooth Ni-Mn coating,the effect of butynediol ethoxylate(BEO)on the performance of Ni-Mn coating was studied in a Watts-type plating solution with saccharin.The effect of BEO on cathodic polarization was investigated through linear scanning voltammetry,and the surface morphology,crystal structure and microhardness of the electrodeposited Ni-Mn coatings were characterized.The possible mechanisms of structure and performance changes of the electrodeposited Ni-Mn coatings were discussed.The results indicated that the addition of BEO shifted the cathodic polarization potential towards a more negative direction,significantly inhibited the cathodic reduction reaction of metal ions,which refined the grain size and favored the formation of a smooth and high microhardness coating.Comparing with the structure and microhardness of Ni-Mn coatings that annealed at 300℃,it was found that the grain coarsening trend of the coating obtained from the bath containing BEO was smaller,and the annealing hardening was more obvious.
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