Phosphate Conversion Coating on Diecast AZ91D and Its Corrosion Resistance

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A phosphate conversion coating was deposited on diecast AZ91D magnesium alloys, the film was a complex phosphate containing Mg and Al,which showed amorphous structure. Corrosion resistance of conversion coating in 3.5%NaCl was investigated by polarization curve. It was showed that the anodic branch of polarization curve for the phosphate conversion coating presented typical passivation characteristic. Immersion test results showed that the corrosion rate of phosphate conversion coating was less than that of chromate Dow7 film.

Info:

Periodical:

Materials Science Forum (Volumes 488-489)

Edited by:

W.Ke, E.H.Han, Y.F.Han, K.Kainer and A.A.Luo

Pages:

819-822

DOI:

10.4028/www.scientific.net/MSF.488-489.819

Citation:

W. Q. Zhou et al., "Phosphate Conversion Coating on Diecast AZ91D and Its Corrosion Resistance", Materials Science Forum, Vols. 488-489, pp. 819-822, 2005

Online since:

July 2005

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$38.00

[1] Jan Ivar Skar, Darryl Albright. Emerging Trends in Corrosion Protection of Magnesium Die-Casting. Magnesium Technology 2003, pp.255-261.

DOI: 10.1002/9781118859803.ch93

[2] H. Umehara, S. Terauchi, M. Takaya. Structure and Corrosion Behavior of Conversion Coatings on Magnesium Alloys. Materials Science Forum Vols. 350-351(2000) pp.273-282.

DOI: 10.4028/www.scientific.net/msf.350-351.273

[3] David Hawke D.L. Albright. A Phosphate-Permanganate Conversion Coating for Magnesium. Metal Finishing 1995. 10 pp.34-38. Fig. 5 EDAX spectrum of phosphate conversion coating 1 2 3 4.

DOI: 10.1016/0026-0576(96)80428-4

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[3] 5 Sealed phosphate Phosphate Dow 7 AZ91D Corrosion rate (mm/a) Fig. 6 Results of immersion test.

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