Mechanically Assisted Electroless Barrel-plating Ni-P Coatings Deposited on Carbon Steel

Zhaoxia Ping 1),Guoan Cheng 1) and Yedong He 2) 1) Key Laboratory of Beam Technology and Material Modification of Ministry of Education,College of Nuclear Science and Technology,Beijing Normal University,Beijing 100875,China 2) Beijing Key Laboratory for Corrosion,Erosion and Surface Technology,University of Science and Technology Beijing,Beijing 100083,China

摘 要：A mechanically assisted electroless （MAE） barrel-plating technique has been developed to deposit Ni-P coatings on carbon steel.The mechanical treatment was carried out in a rolling drum containing carbon steel specimens and glass balls of 2-3 mm diameter,which was submerged in a bath containing electroless plating solution.The coatings are Ni-polycrystalline and have a fine grained structure and smooth surfaces.The hardness and corrosion resistance of the novel coatings are considerably improved compared with the conventional electroless （CE）-plated Ni-P coatings,which are amorphous.After heat treatment at 400 C for one hour,cracks and pores are observed in the CE-plated Ni-P coating,while no cracks appear in the MAE barrel-plated Ni-P coating.The improved properties of the MAE barrel-plated Ni-P coatings demonstrate the advantages of this novel technique,wide applications of which will be found in industries.

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