Influence of rare earths addition on residual stress of Fe-based coating prepared by brush plating technology

金国，卢冰文，侯丁丁，崔秀芳，宋佳慧，刘二宝

Institute of Surface/Interface Science and Technology, School of Materials Science and Chemical Engineering, Harbin Engineering University

摘 要：The effect of rare earths(La, Ce and Pr) addition on residual stress in iron coatings prepared by brush plating was investigated. The results showed that the addition of rare earth transformed the residual stress in the coating from tensile to compressive. To relieve the residual stress, on the one hand, RE elements segregated at the grain boundaries which restricted the coalescence of the grains and provided more capability of grain deformation. On the other hand, RE elements could purify detrimental element and absorb hydrogen atoms in the coating. Among the three rare earths, elements lanthanum showed the most significant effect on surface morphology and residual stress.

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