Effect of KIO₃ on Electroless Ni-P Coating on Aluminum Alloy

The effect of KIO3 on the deposition rate of electroless Ni-P coating on 2024 aluminum alloy was investigated,and the surface morphology was observed.The experimental results showed that KIO3 could accelerate the deposition rate of Ni-P coating on aluminum alloy,and when the concentration of KIO3 in the bath was 20 mg/L,the deposition rate was the highest.Due to the KIO3 addition in the bath,the electroless Ni-P coating was composed of celluar structure,and the celluar structure became smaller and more compact,and the Ni-P surface morphology was more uniform,leading to a better corrosion resistance in 3.5% NaCl solution.