| LIN Bi-lan,LU Jin-tang.Effect of Cerium Nitrate Treatment on Morphology and Corrosion Resistance of Phosphate Conversion Coatings[J],39(4):47-49,64 |
| Effect of Cerium Nitrate Treatment on Morphology and Corrosion Resistance of Phosphate Conversion Coatings |
| Received:March 25, 2010 Revised:August 10, 2010 |
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| DOI： |
| KeyWord:phosphate coatings rare earth cerium nitrate corrosion resistance chromate passivation coatings |
| Author | Institution |
| LIN Bi-lan |
Department of Mechanical Engineering, Xiamen University of Technology, Xiamen , China |
| LU Jin-tang |
School of Materials Science and Engineering, South China University of Technology,Guangzhou , China |
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| Abstract: |
| To fully exert the advantages of phosphate coatings and cerium salt coatings, the traditional phosphate conversion coatings on hot-dip galvanized steel were modified by cerium nitrate pretreatment or cerium nitrate post-sealing. The morphology and corrosion resistance of cerium nitrate modified phosphated coatings were investigated using scanning electron microscopy(SEM), energy dispersive spectroscopy(EDS), neutral salt spray(NSS)test and Tafel polarization measurement, and was compared with that of chromate passivation coatings. The results show that phosphate coatings modified by cerium nitrate pretreatment or post-sealing are the composite coatings contained P,O,Zn and Ce and the disadvantages of the single coatings are overcome, thus the corrosion resistance of two comosite coatings is enhanced greatly. The corrosion resistance of the composite coatings modifed by cerium nitrate post-sealing is superior to that of chromate coatings, and it is the promising replacer of toxic chromate passivation coatings. |
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