Study On The Process And Properties Of Electroless Deposition La-Co-P Magnetic Alloy Film

The chemical plating, as a new kind of treatment technique on metal surface, has advantages, for instance, plating evenly, electroless, simple technology and costless, is used widely. The chemical plating become a new tend in the fields, as to it can raise the corrosion-resistance and working life of product in the protective properties and improve magnetic, wear resistance and hardness of product in functional aspect. Alloy film with rare earth elements joined has excellent properties. In this thesis, La-Co-P alloy films were prepared by chemical plating. Formation, microcosmic topography and composition were analyzed, and the electrochemical mechanism was studied.Introduction and experiment are mainly parts in this thesis. The chemical plating, properties and application of the rare-earth elements, current situation and research purpose were discussed in introduction; Technology, the electrochemical mechanism, microcosmic and composition of La-Co-P magnetic alloy film were researched in experiment; thesis is summarized in the last chapter.Experiment procedure and test methods were introduced in chapter two.Technology and electrochemical mechanism were studied in chapter three. The best plating solution recipe of La-Co-P magnetic alloy film was acquired by orthogonal test (L16(44)). Effect of factors on plating velocity and Co contents were discussed. LK2005 electrochemical workstation was used to study the cathodic polarization and CV curve about La-Co-P alloy film. Electrochemical mechanism was explained by Ep,ip,deposition potential and polarizability. Results show the right quantity of the composition of plating solution is beneficial for deposition.Formation, microcosmic topography and composition of La-Co-P magnetic alloy film are studied in chapter four. Research show by EDS, mass percent of La in alloy film increase with La(NO3)3 concentration improved in plating solution. Results show by SEM, crystalloid of alloy film is wee and evenly. The corrosion-resistance of film measured by two methods. One is soaking experiment, another is electrochemical experiment, the later mainly tested the anodic polarization and taffy curve. Results show corrosion-resistance of film improved with La(NO3)3 concentration improved in plating solution. Results show by VSM, magnetic property improved with percent of La in alloy increased.