Abstract
A new green sealing treatment, involving the use of bidirectional pulse power supply to the micro-arc oxidation ceramic coatings on Al substrate immersed in a solution of aluminum nitrate, has been developed. The best parameters of pulse sealing was obtained through single factor analysis and orthogonal experiment: frequency is 200Hz, the rations of positive and negative are both for 40%, sealing voltage is 80V, electrolyte concentration is 20g/L, sealing time is 30min. The polarization curve of sealing around the ceramic membrane in the mass fraction of 5% NaCl (PH=7) solution was tested. The results show that the ceramic membrane corrosion resistance after pulse sealing has been significantly improved.
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