Effect of stabilizers on the properties of electroless nickel plating
To investigate the effect of stabilizers on the stability and coating performance of the electroless nickel solution,three stabilizers containing potassium iodide,cerium citrate and thiourea were added to the electroless nickel solution to prepare the electroless nickel coatings.Palladium chloride solution was used to test the stability of plating solution.The thickness,phosphorus content,hardness,microstructure,corrosion resistance,and roughness of the coating were characterized using XF-P1M coating thickness measurement and material analyzer,microhardness tester,metallographic microscope,electrochemical workstation,and roughness measuring instrument.The results showed that the stabilizer containing potassium iodide had the best effect,and the decomposition time of the plating solution increased from 198 s to 375 s,the minimum reduction in coating rate was 5.60 μm/h,the hardness increased from 271 HV to 307 HV,the phosphorus content remained substantially unchanged,the crystallization of the coating was much denser and more uniform,and the porosity was reduced.The measured self-corrosion potential of the coating is-0.348 V,and the self-corrosion current density of the coating is 2.924×10-7 A·cm-2,which shows the best corrosion resistance.The lowest roughness is 0.659 μm.
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